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300 torque build 85 Bronco

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pmuller9
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Re: 300 torque build 85 Bronco

Post #201 by pmuller9 » Sun Apr 07, 2019 5:53 pm

There should be a wire that is hot only when the switch is turned to the start position or else how is the starter solenoid working?

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Re: 300 torque build 85 Bronco

Post #202 by BigBlue94 » Sun Apr 07, 2019 6:32 pm

pmuller9 wrote:There should be a wire that is hot only when the switch is turned to the start position or else how is the starter solenoid working?


I dont know. I musta I missed or misread it? I'm fairly frustrated now lol. Been a long day of chasing my tail. It's tough to get to all those wires under the dash.

I have my ignition wired like Gary describes here, and I switched to the white blue wire he describes, and it does the same thing. And I'm using that solenoid vs the relay he shows.

http://www.garysgaragemahal.com/ignition.html

On a different tab it shows the pin out for the ignition switch, but I dont know what to make of it entirely. I see that it has and ign bypass, maybe that's the ticket?
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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Re: 300 torque build 85 Bronco

Post #203 by BigBlue94 » Sun Apr 07, 2019 6:56 pm

There are two wires from ign switch that are hot only in start position. I went through ever single one again and found none that are hot in both run and start.
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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Re: 300 torque build 85 Bronco

Post #204 by pmuller9 » Sun Apr 07, 2019 7:03 pm

OK
Then use one of the wires that is hot only when the ignition switch is on (not Start) to run the power relay and keep the jumper you have going from the starter solenoid to the power relay to run the power relay during start.

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Re: 300 torque build 85 Bronco

Post #205 by BigBlue94 » Mon Apr 08, 2019 9:29 am

pmuller9 wrote:OK
Then use one of the wires that is hot only when the ignition switch is on (not Start) to run the power relay and keep the jumper you have going from the starter solenoid to the power relay to run the power relay during start.


When that jumper was on, I only had spark on the start position. As soon as I let off, the spark went away.
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

pmuller9
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Re: 300 torque build 85 Bronco

Post #206 by pmuller9 » Mon Apr 08, 2019 9:55 am

BigBlue94 wrote:
pmuller9 wrote:OK
Then use one of the wires that is hot only when the ignition switch is on (not Start) to run the power relay and keep the jumper you have going from the starter solenoid to the power relay to run the power relay during start.


When that jumper was on, I only had spark on the start position. As soon as I let off, the spark went away.

The jumper supplies voltage to the power relay when the starter solenoid is on. The jumper should be connected to the SMALL terminal marked as "I" on the starter solenoid.
The other wire that is only on when the ignition switch is in the run position supplies voltage to the power relay when the starter is off.
Between the two wires the power relay stays on during start and also when the ignition switch is in the run position.
Just connect both wires to the power relay and you are done.

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Re: 300 torque build 85 Bronco

Post #207 by BigBlue94 » Mon Apr 08, 2019 11:08 am

pmuller9 wrote:
BigBlue94 wrote:
pmuller9 wrote:OK
Then use one of the wires that is hot only when the ignition switch is on (not Start) to run the power relay and keep the jumper you have going from the starter solenoid to the power relay to run the power relay during start.


When that jumper was on, I only had spark on the start position. As soon as I let off, the spark went away.

The jumper supplies voltage to the power relay when the starter solenoid is on. The jumper should be connected to the SMALL terminal marked as "I" on the starter solenoid.
The other wire that is only on when the ignition switch is in the run position supplies voltage to the power relay when the starter is off.
Between the two wires the power relay stays on during start and also when the ignition switch is in the run position.
Just connect both wires to the power relay and you are done.


You arent understanding, I had BOTH the jumper and the other ign hot wire hooked up and didnt get any spark in the run position. My issue isn't understanding what to do, it's why I'm not seeing what I'm supposed to be seeing. The old coil wire is the only one I'm supposed to need, but that is obviously not the case. Could the ignition switch itself be bad causing this?
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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Re: 300 torque build 85 Bronco

Post #208 by pmuller9 » Mon Apr 08, 2019 11:28 am

The ignition switch has a bypass terminal which is normally used in place of the jumper you have from the starter relay.
It can be connected to the ignition hot wire to give you voltage when the switch is both on and start.
It must not be connected.
The switch is OK

So lets trouble shoot
Right now the ignition hot wire and the jumper wire are both connected to the power relay.
If you turn the ignition switch on (Not Start) does the power relay turn on and stay on by checking output voltage with a meter?
THIS IS IMPORTANT!! How much voltage do you see at the power relays activation terminal where the ignition hot wire connects to?

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Re: 300 torque build 85 Bronco

Post #209 by BigBlue94 » Mon Apr 08, 2019 12:02 pm

Aye, I've seen the 'bypass' on the switch diagram.

I cant recall if the ign solenoid clicked on with both leads hooked up. With just the coil wire, it clicks on in run and off in start. I'll check tonight.

Is it possible I snipped a wire that I shouldn't have when removing the rest of the engine bay harness? Everything I snipped was either unhooked previously or went to the coil and old dizzy. One may have been looped back or something.
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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Re: 300 torque build 85 Bronco

Post #210 by pmuller9 » Mon Apr 08, 2019 12:13 pm

What is puzzling is, if the power relay stays on with the ignition hot wire and if it is also on with the start solenoid jumper then if both wires are in play the power relay should be on for both start and run.

The reason I want you to check the ignition hot wire voltage with a meter is because those high power cart relays draw a lot of current and if there is ballast resistance in the ignition line the voltage going to the relay will drop.

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Re: 300 torque build 85 Bronco

Post #211 by BigBlue94 » Mon Apr 08, 2019 12:27 pm

I see. I will say most all wires I test that are hot are 12.4v or so.
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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Re: 300 torque build 85 Bronco

Post #212 by BigBlue94 » Mon Apr 08, 2019 6:29 pm

Alright, I just got home from work, so here is my starter solenoid, left is the front. On the left terminal is the battery, alternator fusible link, the 12v supply for the secondary ignition solenoid, and two light bars. Nothing on the next terminal. The next one has the Red/Lt Green wire that used to have the little 90° boot terminal on it. That is also where I connected the jumper wire. Back terminal is the starter wire.

Image

This is my secondary ignition solenoid. 12v comes in the left most terminal. On the second terminal from the left, is the 'old coil wire'. This is also where the yellow jumper wire was/is attached. Third is the ground. Right most terminal is the 12v out to the distributor.

Image

Here is the spot the harness comes through the firewall. The white wire pointing up is the old coil wire I'm using as the switch on source. The red one next to it is the old distributor wire.

Image

Different angle

Image

This message is a duplicate of what I posted over at FSB, and I don't think I mentioned the little 90° boot wire here.

I'm thinking in gonna take an always hot wire, and run it to a toggle switch, then to the ignition solenoid. When I energize the switch, it will power on the ignition solenoid, and should turn the ignition on. At least that way I can get it running. I may even just make that permanent, as it's not a daily driver.
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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Re: 300 torque build 85 Bronco

Post #213 by BigBlue94 » Mon Apr 08, 2019 7:32 pm

So I ran a wire from my aux battery to a rocker switch, then a wire to existing turn on wire for my ignition. That functions perfectly. First crank it fired up. Even idled on it's own. I've run it about 10 minutes but I didnt have a full radiator, so it got to 210 degrees and I shut it down. The thermostat had already opened.

Hope this video works. Sorry for the exhaust leak lol

https://youtu.be/IjIARlqU91w
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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Re: 300 torque build 85 Bronco

Post #214 by pmuller9 » Mon Apr 08, 2019 9:40 pm

I hear the exhaust leak and also hear something that sounds like a gear whine?

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Re: 300 torque build 85 Bronco

Post #215 by 54-4x4 » Mon Apr 08, 2019 11:35 pm

I like your gauges.Nice set up.Glad you got'er running.

BigBlue94
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Re: 300 torque build 85 Bronco

Post #216 by BigBlue94 » Tue Apr 09, 2019 9:06 am

pmuller9 wrote:I hear the exhaust leak and also hear something that sounds like a gear whine?


Those are my timing gears, and have always sounded like that. They are both steel or iron, but not straight cut. It sounds more pronounced in that video than in person. Be cool if that was a supercharger lol

The exhaust leak sounds like it's coming from the head end of the headers.

Now to fill the rest of the coolant, and break in the cam
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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Re: 300 torque build 85 Bronco

Post #217 by pmuller9 » Tue Apr 09, 2019 9:56 am

Great Job!
Looking forward to your first test run on the street.

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Re: 300 torque build 85 Bronco

Post #218 by sandboxer » Tue Apr 09, 2019 10:20 am

It has a nice beefy sound.

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Re: 300 torque build 85 Bronco

Post #219 by BigBlue94 » Tue Apr 09, 2019 11:07 am

Thanks! Yeah I cant wait to get it out of the shop it's been parked in for nearly 3 years. Between coil issues, TTB rebuilds, carb rebuilds, a mystery illness, and a blown head gasket, it's about darn time I get to enjoy a bronco again. 3 weeks from now itll be driving 900 miles to Moab for the bronco safari.

I think it sounds nice and beefy too, except for the leak lol.

Clifford? headers -> custom 2.5" pipe into a flowmaster scavenger y-collector-> 3" small magnaflow cat-> 12" L. Borla xr1 sportman oval case muffler-> out a single 3" tailpipe with a turndown at the end.
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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Re: 300 torque build 85 Bronco

Post #220 by BigBlue94 » Fri Apr 12, 2019 9:55 am

So I went to break in the cam, and after 5 minutes, i had so much oil leaking out the half bolted cut up valve cover, I decided to put my actual valve cover on.

Well when I laid the rubber felpro gasket backbone the head, it was an inch too long! So I ordered a bluestripe cork one so I'd have it today. Last night the rubber one had only shrunk back down about half an inch. Still doesnt fit! Weird huh?
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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THE FRENCHTOWN FLYER
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Re: 300 torque build 85 Bronco

Post #221 by THE FRENCHTOWN FLYER » Fri Apr 12, 2019 10:37 am

If the rubber (or silicone) gaskets are exposed to mineral spirits in a de-greasing tank they will swell up. You could put them in a warm environment - like a car in the sun - for several weeks and they will probably shrink back down as the solvent evaporates.

...Or just buy new.
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BigBlue94
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Re: 300 torque build 85 Bronco

Post #222 by BigBlue94 » Fri Apr 12, 2019 10:49 am

That's true. But this gasket only touched oil. I used some silicone hose to siphon my old fuel out and it swelled like crazy
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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Re: 300 torque build 85 Bronco

Post #223 by THE FRENCHTOWN FLYER » Fri Apr 12, 2019 11:11 am

Also true. Compounds in today's fuel and combustion by-product compounds in your crankcase can also cause swelling over time, making "re-usable" gaskets "not-so-reusable".
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Re: 300 torque build 85 Bronco

Post #224 by BigBlue94 » Fri Apr 12, 2019 12:38 pm

THE FRENCHTOWN FLYER wrote:Also true. Compounds in today's fuel and combustion by-product compounds in your crankcase can also cause swelling over time, making "re-usable" gaskets "not-so-reusable".


Understandable. The odd thing is this gasket has no more than 15 minutes of time on the engine while running. Its brand new essentially.

Live and learn!
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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Re: 300 torque build 85 Bronco

Post #225 by BigBlue94 » Mon Apr 15, 2019 10:10 am

Got my cam broke in yesterday morning. Had excellent oil pressure, good coolant temps, and no fluid leaks. I still have an exhaust leak, but its better.

Now to tune the idle mixture, set the idle, and set the fuel pressure. Then it's time to go for a spin!

This was the very end of breakin. The yellow light is to remind me to shut the ignition off, since it's now on a stand-alone switch.

https://youtu.be/_-cn1HqEKmA

Dont mind the temp warning light, I think my sender was being heated by the headers. It's supposed to light up at 225°.
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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Re: 300 torque build 85 Bronco

Post #226 by THE FRENCHTOWN FLYER » Mon Apr 15, 2019 10:28 am

Re; Yellow warning light:

Could you hook up a relay tied to the key that energizes the ignition circuit, eliminating the need for the separate switch / light?
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Re: 300 torque build 85 Bronco

Post #227 by BigBlue94 » Mon Apr 15, 2019 11:46 am

THE FRENCHTOWN FLYER wrote:Re; Yellow warning light:

Could you hook up a relay tied to the key that energizes the ignition circuit, eliminating the need for the separate switch / light?


I tried, and couldn't get it to work properly. I couldn't find a wire that was hot in both start and run, and a two wire setup to solve that didnt seem to work either. I am running a seperate solenoid for the ignition, that this switch turns on. If I wasnt driving it 900 miles to Moab in two weeks, I'd have more time to investigate. Gotta get these rings seated!

Not only do I have to worry about the engine, I've gotta worry about most everything as the bronco hasn't driven more than 20 miles in 3 years. The TTB rebuild is two years old with 10 miles on it lol!
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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Re: 300 torque build 85 Bronco

Post #228 by BigBlue94 » Sat Apr 20, 2019 6:21 pm

Help! Carb noob in distress!

Okay, idle mixture is good, at running temps, at 13.2. Idle at 775 rpm. Timing 10° BTDC. Stock quickfuel (Holley 4160) 450 cfm.

Jets were labeled as 56, but I couldn't get a .055 drill through it. So I drilled them out to the .055. I only have jets up to 53. I have # series drill bits so I can increase in increments of about .004-.005"

Still running lean with partial throttle, and backfiring upon letting off the pedal. The more I open the throttle, the cleaner it gets. But I think it's better.

Do I need to open these jets up more? Bigger squirter too?
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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Re: 300 torque build 85 Bronco

Post #229 by pmuller9 » Sat Apr 20, 2019 7:13 pm

What is the air/fuel ratio at mid throttle and WOT?

The Schneider 140H cam can use a little more initial timing.

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Re: 300 torque build 85 Bronco

Post #230 by BigBlue94 » Sat Apr 20, 2019 7:32 pm

pmuller9 wrote:What is the air/fuel ratio at mid throttle and WOT?

The Schneider 140H cam can use a little more initial timing.


AFR 16+, maybe up to 18. Seems to keep leaning out the more throttle I give it, haven't gotten it past 2500 rpm.

By more timing, you mean advance to say 14° BTDC from 10°. That seems to raise the idle a bit, but I can adjust it back down. I was adjusting both before and after 10° BTDC but the backfire persisted
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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Re: 300 torque build 85 Bronco

Post #231 by pmuller9 » Sat Apr 20, 2019 10:20 pm

With the vacuum advance disconnected, Initial timing at 14* would be better but make sure the total timing is not beyond 36* BTDC.
If so you would need to shorten the mechanical advance.

The A/F ratio at idle is OK in the 13s and can go into the 14s at small throttle openings under a light load.
The A/F ratio should go back into the 13s during half throttle to WOT.
Any A/F over 15 at any time is too lean.

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Re: 300 torque build 85 Bronco

Post #232 by BigBlue94 » Sat Apr 20, 2019 10:30 pm

I'm going off a self made mark on the balancer for TDC, as my pointer is missing. I'm using the timing cover marks. My dizzy paperwork says 24° @ I think 3000rpm. How would I know if it goes past 36?

So being to lean means opening up the jets. I did open another set to .059". I'll try them tomorrow.

I cant get the clutch adjusted right either. Haven't checked visually, but it's not fully engaging. Hydraulic system is fully bled. The slave seems to not be extending enough, and collapses too far if I push the clutch fork forwards.
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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Re: 300 torque build 85 Bronco

Post #233 by pmuller9 » Sat Apr 20, 2019 10:40 pm

It looks more like the power valve is not opening.
I believe the PV is a 6.5 which may be to low.
What is the vacuum at idle?

If the balancer is 6.75" in diameter then the circumference is 21.20"
36 degrees would be 2.12" so you would simply make another mark on the balancer 2.12" before the TDC mark.

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Re: 300 torque build 85 Bronco

Post #234 by BigBlue94 » Sat Apr 20, 2019 10:53 pm

It is a 6.5 PV. I haven't measured vacuum. I'll add that to my list for tomorrow. I have an older 5.5 as well.

No where in my town stocks Holley parts. I'll have to have anything I need overnighted.

10-4 on the balancer
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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Re: 300 torque build 85 Bronco

Post #235 by pmuller9 » Sat Apr 20, 2019 11:13 pm

The PV is usually half of the idle vacuum.
If possible run a long vacuum line so you can watch the vacuum gauge as you drive.
Then you can see have far the vacuum drops as the A/F ratio goes lean.

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Re: 300 torque build 85 Bronco

Post #236 by Wesman07 » Sun Apr 21, 2019 1:02 am

BigBlue94 wrote:I cant get the clutch adjusted right either. Haven't checked visually, but it's not fully engaging. Hydraulic system is fully bled. The slave seems to not be extending enough, and collapses too far if I push the clutch fork forwards.


Have someone function the clutch pedal while you watch the slave cylinder/firewall. These trucks are notorious for cracked firewalls, especially after a stiff after market clutch was installed.

Luckily there is a good fix for this if my suspicions are correct.
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86 f150 300 efi with advanced stock cam. Np435, Dana 60/ 10.25, 35" BFG's, four link front suspension with 12" travel fox coil overs, custom deaver leaf pack in the rear.

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Re: 300 torque build 85 Bronco

Post #237 by BigBlue94 » Sun Apr 21, 2019 9:28 am

Wesman07 wrote:
BigBlue94 wrote:I cant get the clutch adjusted right either. Haven't checked visually, but it's not fully engaging. Hydraulic system is fully bled. The slave seems to not be extending enough, and collapses too far if I push the clutch fork forwards.


Have someone function the clutch pedal while you watch the slave cylinder/firewall. These trucks are notorious for cracked firewalls, especially after a stiff after market clutch was installed.

Luckily there is a good fix for this if my suspicions are correct.


Neither this or the previous clutch were very stiff.

I've watched the slave with a mirror while pushing the pedal. It does push the clutch fork, but i dont think far enough.

No fix is the only good fix with now only a week till I leave. I am aware of that issue, and the patch panel they sell to fix it. I hope that's not the issue.

All else fails, I can thread the end to the slave plunger rod and use another piece of threaded stock to extend it, and keep it adjustable.
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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Re: 300 torque build 85 Bronco

Post #238 by Wesman07 » Sun Apr 21, 2019 10:46 am

All it takes is a small crack between the master and the mounting bolt to cause the issue your describing. The problem is the flex in the fire wall acts as a spring and soaks up the clutch throw no matter how you adjust it.

You just need is something to spread the load like a piece of plate steel, not an over engineered bracket for $300 lol. I simply epoxied mine in and through bolted it. A guy like you could make something up in an hour flat and be good to go in the morning.
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86 f150 300 efi with advanced stock cam. Np435, Dana 60/ 10.25, 35" BFG's, four link front suspension with 12" travel fox coil overs, custom deaver leaf pack in the rear.

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Re: 300 torque build 85 Bronco

Post #239 by BigBlue94 » Sun Apr 21, 2019 12:28 pm

Clutch master is out, finally. Those two nuts are a PITA.

There was a slight deflection and maybe a small crack. Have to investigate further. Better to put the plate inside or outside the cab?
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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Re: 300 torque build 85 Bronco

Post #240 by BigBlue94 » Sun Apr 21, 2019 3:45 pm

Clutch still not working.

15" of vacuum at idle. 750 rpm
Timing set to 14° BTDC
AFR:
- idle 13
- partial throttle 16,17
- WOT 10
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

BigBlue94
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Re: 300 torque build 85 Bronco

Post #241 by BigBlue94 » Sun Apr 21, 2019 4:00 pm

Master cylinder rod had this eyelet that could adjust. So I turned it 2 rotations out. I can now engage reverse and first without a single grind of a gear!
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

BigBlue94
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Re: 300 torque build 85 Bronco

Post #242 by BigBlue94 » Sun Apr 21, 2019 4:49 pm

Just got back from a 4 mile drive! Definitely a little lean at cruise, about 15-17 AFR.

Punching the throttle it goes a tad rich, about 11.

The needle was moving constantly so an exact measurement was tough. 2 miles in, the idle seemed to have leaned out to 14-15

https://youtu.be/zobA_DZ5Zzs
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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Re: 300 torque build 85 Bronco

Post #243 by pmuller9 » Sun Apr 21, 2019 7:21 pm

Nice! Good to see you on the road. Sounds good.

To start with, you should be able to adjust the idle using the two idle adjustments on the metering block for at least 18 inches of vacuum.
See if you can maximize the idle vacuum.
Then check the idle and cruise A/F ratios

Looks like the power valve is opening up OK.
The main jets seem to be rich.

When you first punch it the A/F ratio will go rich from the accelerator pump then it should settle out to some around 13.

BigBlue94
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Re: 300 torque build 85 Bronco

Post #244 by BigBlue94 » Sun Apr 21, 2019 8:05 pm

Yeah, I adjusted the idle mixture screws and couldn't get the vacuum much above 15. So i adjusted them to get the idle mixture at 13ish. Vac still at 15.

In fourth gear, it's gutless at 45 or so. But drop into 3rd and, as you heard, it's got plenty of power.

Currently the main jets are .055"
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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THE FRENCHTOWN FLYER
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Re: 300 torque build 85 Bronco

Post #245 by THE FRENCHTOWN FLYER » Sun Apr 21, 2019 9:42 pm

BigBlue94 wrote:... I'm using the timing cover marks. My dizzy paperwork says 24° @ I think 3000rpm. How would I know if it goes past 36?...


Make one of these and stick it to your damper face.

https://www.flickr.com/photos/152086878 ... ateposted/

https://www.flickr.com/photos/152086878 ... ateposted/

Here's a similarly marked aftermarket damper

https://www.flickr.com/photos/152086878 ... ateposted/


BTW, the number size on the jet does not necessarily match up to the opening size. Rather, it matches up to the flow rate of the jet.
If you must drill out the jet do it manually by hand - a machine drilling is not accurate enough.
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

pmuller9
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Re: 300 torque build 85 Bronco

Post #246 by pmuller9 » Sun Apr 21, 2019 9:57 pm

I'm surprised the best idle vacuum is 15.

Here is where the balancing act begins.
You can try using a smaller main jet and see what happens to the WOT A/F ratio.
However the cruising A/R ratio may go leaner.
Fortunately the Quick Fuel carbs come with changeable Power Valve Channel Restrictions so if you find that going smaller on the main jet doesn't work for the cruising A/R ratio then you can go to a smaller PVCR instead.

Have you had a chance to see what the total timing is yet?

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Re: 300 torque build 85 Bronco

Post #247 by Wesman07 » Mon Apr 22, 2019 10:56 am

Nice work! Sounds like you have the clutch issue solved. For future reference, I put the plate on the outside of the cab because there was more room to work with.

Your truck sounds great! do you have noticeably less power below 2k?
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86 f150 300 efi with advanced stock cam. Np435, Dana 60/ 10.25, 35" BFG's, four link front suspension with 12" travel fox coil overs, custom deaver leaf pack in the rear.

BigBlue94
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Re: 300 torque build 85 Bronco

Post #248 by BigBlue94 » Mon Apr 22, 2019 10:58 am

Nope, haven't checked total timing. I set it to 14 with the dizzy vac unhooked. 15" Hg right where it was with the old engine and stock cam.

As for drilling the jets, I did do it by hand with a Jacob's #0 chuck holding the bit, and with the next larger drill than would fit through the hole. I have 49, 51, and 53 jets, plus .055 and .059 jets with the jet hole chamfered. Once I get to moab next week, AbandonedBronco is selling me his carb parts so I'll have nearly infinite adjustability, including air bleeds and such. Plus his knowledge to boot.

Power is good when I'm in the right gear. But in 4th at 45 it's a dog. But man does it pull when you romp on it in 3rd
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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Re: 300 torque build 85 Bronco

Post #249 by pmuller9 » Mon Apr 22, 2019 11:02 am

Why are you drilling jets larger when you need to go leaner at WOT?

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Re: 300 torque build 85 Bronco

Post #250 by BigBlue94 » Mon Apr 22, 2019 11:27 am

Because I'm a carb noob! And that was before I'd driven it, which have me different readings than revving in neutral in the shop.

I thought the main jets affected the cruise circuit, and the power valve did the WOT. I'm lean at cruise and rich when I stomp on it.
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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