FordSix Performance Forum

MechRick

I have a 'what if'.

What if Comp ground this cam on a 112 degree lobe center? This would allow retarding the intake valve closing point without affecting the exhaust, reducing DCR. Correct?

MechRick

I'll take a page from what Ford did in the early '80's and learn from it. Ford EECIII systems used a crank sensor mounted to the balancer and an ignition module on the inner fender with timing controlled by the EEC computer. The harness from the crank sensor through the PCM to the module used unseal...

MechRick

LittleJimmy wrote:Am I crazy or could this comp 268 cam profile increase DCR and cause detonation?

This was my experience also.

MechRick

Pusher fan mounted in front of the A/C condenser.

Yes on the two different size threaded hubs...

MechRick

There are two different size hubs. With A/C or without. I ran the non-A/C one with a pusher fan with no overheating.

The non-A/C trucks didn't have a full fan shroud. I remember moving the small pusher fan around while monitoring A/C head pressure. Where it was lowest I bolted the fan down...

MechRick

I'm not sure I'm what you consider a serious mechanic, but I've done what you are asking about. I installed a Comp 268 in an otherwise stock EFI cylinder head. I did check for valve spring coil bind and valve tip contact, and lifter plunger location. See my sig for details. I don't recommend stock s...

MechRick

Them cats eat scorpions??!! I've seen them at night under the mercury vapor light on the garage eating something . I've noticed when they are around, scorpions are not. Supposedly a few chickens does the trick too. This year is lizard year. And I think there are less black widows as a result... Bac...

MechRick

Interesting about soy-based insulation. Nissan has a problem with mice eating through the knock sensor harnesses on some of their vehicles. Only the knock sensor harnesses. I wonder if the insulation is soy based. Anyway, supposedly the fix was to mix cayenne pepper in the insulation. We occasionall...

MechRick

I think the biggest advantage of waste spark ignition is to simplify ignition on engines that don't need a cam position reference for fuel or ignition. As Pmuller said, the most common early usage was carburetted inline four cylinder motorcycles. Most manufacturers that used waste spark ignition did...

MechRick

The head flanges are scavenged from a Ranger tubular factory manifold. They are not quite 3/8" in thickness (metric?). I like the bolt spacers. Allows a longer bolt for more stretch, keeps them from loosening up over time. The T3 turbo flange is 3/8" steel. The tubing is 16 gauge 1 1/2&quo...

MechRick

Nikola Tesla was the father of A/C, many do not know Thomas Edison was the father of D/C. When experimenting with batteries and deducing electron flow, he guessed at the direction of electrons from positive to negative (he guessed wrong). Electrons flow from negative to positive in an electronic cir...

MechRick

Good stuff. This highlights the different requirements of a street-driven vehicle that spends most of it's time at low RPM (~2000) and a race vehicle that has to routinely zip to 6500+. I grew up in the days of points ignition. I remember my Dad yelling at me when listening to the radio with the ign...

MechRick

Coolant plumbing... https://i.postimg.cc/SQVRYCpk/IMG-20200425-125516.jpg https://i.postimg.cc/Gp0mnjvJ/IMG-20200425-132553.jpg https://i.postimg.cc/0NdPR1kP/IMG-20200425-174939.jpg Oil plumbing... https://i.postimg.cc/sDvjBLc4/IMG-20200425-174946.jpg https://i.postimg.cc/0NZF0k5M/IMG-20200430-18572...

MechRick

The right side engine mount interfered with the wastegate of the turbo. The fluid-filled mounts and brackets set farther rearward than the older-style mounts, so I made a switch. I incorporated the mount bracket into the A/C compressor bracket. https://i.postimg.cc/rF3859ZX/IMG-20200425-180931.jpg h...

MechRick

I think you will hear opinions from both camps in this one. I've always been an O/E type of guy. The reason for that is I've seen and repaired too many aftermarket ignition systems over the years. I won't mention names, but I've seen all of the aftermarket electronic ignition systems fail, and have ...

MechRick

The cylinder wall has scuffs that show evidence of the occurrence. No deep cuts just surface abrasions. The general rule is if will catch a fingernail, you should overbore. Can I get away with with replacing the broken piston If you think the rest are ok, you can. The replacement should be the same...

MechRick

Cracked rings=broken Piston=grooved cylinder wall. I've never seen a cylinder survive broken parts without some damage.

You can pull the plug and stick a camera in there to check for cylinder wall damage.

MechRick

3.73 for now. That will change. I want to drive it with the turbo 1st to:

A) Make sure the turbo meets my goals

B) If it doesn't meet my goals and I swap a V8 in, the 3.73 set will work ok.

MechRick

A Bronco in it's habitat, miles from asphalt...

toast hampstead

MechRick

The 5.0 is a great economy engine with light weight and power The 5.0L in a truck application needs more stroke. It's possible to cram a 351 Cleveland crank in a 5.0L block, with a bunch of machine work. https://suicideslabs.com/dw/engine/chucko/chucko.htm Nowadays, the common 3.4" stroke afte...

MechRick

The Ranger based Bronco II is an absolute honey of a platform, but weight and appointments needed for off terrain work means a minimum of 2.5 liters just to get a 3600 pound vehicle off the mark. With the old 1.4 turbo to normally aspirated conversion, a turbo 2.5 is a 3.5 liter engine for all inte...

MechRick

How's much of an advantage of clearing the whole shoud vs just cleaning up the points? Anything you do to improve airflow through the engine will allow you to make more HP. When unshrouding my fours, I noticed boost came in sooner. Same result with oversize valves. I would want full boost by 1600-1...

MechRick

I almost cut the top off last summer. That would have required a custom soft top, out of the budget. I decided to get rid of the leaky sunroof and add some open air ability by installing a canvas roof. https://i.postimg.cc/wxygG9W4/IMG-20190818-094140.jpg I supplement it in the winter with hardboard...

MechRick

Thanks, Bubba. I've put about 20,000 miles on it since the Sept 2018 post. I really enjoy driving it. One of the cons of turbos is the requirement for good, detonation-resistant fuel. One of my goals is better MPG, so forcing me to use premium fuel defeats the goal. I'm going to try to run 87 octane...

MechRick

The 2" body lift helps, but the stock Turbo Coupe exhaust manifold places the turbo where the evaporator housing is. I will have to scratch build an exhaust manifold. Mocking up the turbo with brace in a suitable location: https://i.postimg.cc/7LfsvGqG/IMG-20191103-153655.jpg https://i.postimg....

MechRick

The biggest problem is the massive jump from first gear to second gear in the Toyo-Kogyo 5 speed (3.96 to 2.08). The 2.3L doesn't make decent torque until 2500 RPM. Because of that, you have to rev the engine to 4000 RPM when taking off in 1st gear, or the shift to second bogs horribly. Gears will h...

MechRick

I think I've mentioned before that I'm not thrilled with the power output of the 4 cylinder in this application (3600 lbs with me in it). I'm getting 19 mpg in mixed driving. Straight highway it gets low 20's. It's not bad, but I'm pretty sure a 5.0L M5OD would not be far off of those numbers. I bou...

MechRick

I decided on two-tone Rustoleum/bedliner. The Rustoleum will make scratch repair a cinch, and the bedliner on the sides helps prevent it. The bedliner is Brick Red Durabak and I highly recommend it. Rolls on with a 4" roller. https://i.postimg.cc/C199rCDx/IMG-20190602-134752.jpg https://i.posti...

MechRick

Much to catch up on. Axles, paint, and forced induction. Rear axle is an Explorer Sport Trac 8.8 rear (31 spline) and front axle is Explorer Dana 35 TTB. Ratios are 3.73:1. Needs to be ~4.88-5.13:1 to make 5th gear useable. I'm waiting for the turbo installation to chose ratios. I'm hoping the disc ...

MechRick

Did Ford install anything undersized when new? We would see this occasionally when I was still working at Ford dealers. It was not uncommon to see one rod journal or one main ground undersize with the appropriate bearing installed. A coworker of mine bought an Escort GT new (1988 if I'm remembering...

MechRick

I wonder if anyone has attempted to run one of the 2 4bbl manifolds with adapters and a pair of Weber 32/36's?

That just might be the perfect street carb setup.

MechRick

If you have 10 gauge wire in surplus, just run two of those from the alternator to battery +. That's what Ford did on many factory vehicles, and what I did on my Bronco. I didn't fuse mine (probably not the best idea). I did make absolutely sure there were no sharp edges or possible short-causing si...

MechRick

A pocket screwdriver and penetrating oil. Stick the screwdriver between the nipple and hose, give it a shot of penetrating oil, grab the hose and give it a couple of good twists. Usually comes right off. It's generally a bad idea to lubricate the inside of a hose when installing. Real carb cleaner w...

MechRick

Offenhouser DP manifolds have a split-runner design. A typical staged 4 barrel carb would have the primaries over the smaller sectional runners, and the secondaries of the carb over the larger runners. A 2 bbl throttle body EFI would not be able to take advantage of this arrangement. Most of the new...

MechRick

You are right, Paul. I meant to say 'more resistance yet'.

On a snap test, spark voltage always rises (because resistance goes up). Then when the fuel hits it voltage comes back down.

MechRick

Think of the Mighty Mississippi as a high current low voltage wire. The lower the voltage, the bigger the conductor needs to be. Manufacturers have wanted to switch to higher vehicle voltage systems for years. The main reason is the wire diameters in the vehicle could be reduced, saving cost. What s...

MechRick

If it were mine, I'd put a Holley 390 on a Eddy DP or C and call it good. The Holleys are better with heat soak than all of the other options. -But dump trucks tend to sit for months at a time until needed. This is not a good scenario for *any* carb. The second best option would be to rob a late '80...

MechRick

Compared to other engines, the Ford Six's valve angles are pretty tame. One of these days I'm going to pull a set of iron Cleveland heads out of the shed and start reworking them. Now there is some valve angles. Have you seen a modern D*dge hemi apart? What a disaster. They are based on the M*par sm...

MechRick

I went through the same thing with my Bronco. The cam was a Comp 268H. With an Offy DP and a manual transmission, it was tough to crawl around off road. It would surge, lunge, buck and stall under 1000 RPM. Same engine with a carefully tuned multiport injection (Megasquirt) did the same thing. I tri...

MechRick

Don't forget that the pickup moves inside the distributor every time the vacuum signal changes. the two wires that connect the pickup to the housing can work harden and break inside the insulation.

Tell me how you like those tires. Specifically how much noise they make...

MechRick

The one I have is off an FE-powered dump truck. It's the big version, and I think it's rated 500 cfm. Not sure whether they are rated at 1.5" or 3". I can't remember the cfm of the smaller version off the top of my head. One of the things that confused me about that carb is the air cleaner...

MechRick

I have one in a box somewhere that I've run on various Fords through the years. Like most things that deviate from the norm, they are maligned because they are misunderstood. There were several different versions of the Ford VV. Early ones had a cold start enrichment solenoid screwed into the base. ...

MechRick

Edelbrock and Trickflow are both making Clevor intakes. Trick Flow makes an EFI intake. A 408 EFI Clevor would make a great truck engine. If you do go that route, replace the two-piece valves. They are known to come apart under higher than stock spring pressures. I've got a 351C with the open-chambe...

MechRick

the "EFI" cover came out in 85 when they went to pedestal rockers Correct. The pedestal bolt-down rockers are stamped steel and taller than the earlier cast iron units. You can remove the pcv baffles on the older valve cover to clear stamped steel rockers. I did that years ago to retain t...

MechRick

Checking resistance of the battery cables is not reliable due to the voltage/current involved. The average starter consumes 150 amps. Voltage at the battery while cranking is 10-11 volts. Ohms law gives you a starter resistance while cranking of about .07 ohms. If you had a cable resistance of .07 o...

MechRick

For my Bronco II, overall length of the transfer case is an issue. Wheelbase is ~94" (same as Jeep CJ7, YJ, TJ). The BW 1350 that is in there is a fixed yoke output. The Rubi case would probably be the best option for me. I would have to deal with the oddball 25 spline output of the transmissio...

MechRick

For a rock crawler, you really need two things. A super low 1st gear (or a 4:1 box or a doubler), and if you intend to drive the thing on the highway, overdrive. Wide ratio transmissions work best. And for those who like math, there is a simple formula to calculate just how wide ratio a given transm...

MechRick

Think of stall speed as the fastest the converter will let the engine spin without the vehicle moving. That's when the most torque multiplication happens. Torque multiplication is due to the stator. Driving over rocks is easier in an auto, but the downside is heat. Most of the heat generated in an a...

MechRick

that 5.72 to 1 granny ratio is so nice Yes it is. I miss my Bronco once in a while. It's crawl ratio was 5.72 x 2.69 x 3.55 = 54.62. Not too shabby. With 5.13's it would have been 78.93. Typical torque converter multiplication is somewhere between 1.8-2.5:1 at stall. The math isn't precise, but a 2...

MechRick

The '73 2.3L should have an oval port head. I would ditch that in favor of a 'D' port head and matching intake. A Ranger round port head and matching intake would be a good choice also. The Weber carbs don't get as good fuel economy as the one barrel setups of the eighties Mustangs. I've had the bes...

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