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Search found 968 matches

by MechRick
Wed Jun 17, 2020 11:57 am
Forum: 240-300 "Big Block" Six Performance
Topic: Really wierd, Comp 268 detonation
Replies: 19
Views: 445

Re: Really wierd, Comp 268 detonation

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?
by MechRick
Wed Jun 17, 2020 11:25 am
Forum: 240-300 "Big Block" Six Performance
Topic: crimping and soldering wire or cable ends Which is best?
Replies: 24
Views: 568

Re: crimping and soldering wire or cable ends Which is best?

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...
by MechRick
Tue Jun 16, 2020 4:18 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Really wierd, Comp 268 detonation
Replies: 19
Views: 445

Re: Really wierd, Comp 268 detonation

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


This was my experience also.
by MechRick
Tue Jun 16, 2020 4:16 pm
Forum: 240-300 "Big Block" Six Performance
Topic: what have i done? water pump oddity
Replies: 9
Views: 365

Re: what have i done? water pump oddity

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

Yes on the two different size threaded hubs...
by MechRick
Sun Jun 14, 2020 1:24 pm
Forum: 240-300 "Big Block" Six Performance
Topic: what have i done? water pump oddity
Replies: 9
Views: 365

Re: what have i done? water pump oddity

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...
by MechRick
Wed May 20, 2020 10:33 am
Forum: 240-300 "Big Block" Six Performance
Topic: Pedestal rockers with new profile cam
Replies: 8
Views: 380

Re: Pedestal rockers with new profile cam

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...
by MechRick
Sun May 17, 2020 4:23 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Started my build
Replies: 163
Views: 7333

Re: Started my build

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...
by MechRick
Sat May 16, 2020 10:30 am
Forum: 240-300 "Big Block" Six Performance
Topic: Started my build
Replies: 163
Views: 7333

Re: Started my build

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...
by MechRick
Sat May 02, 2020 10:28 am
Forum: 240-300 "Big Block" Six Performance
Topic: Coils especially Thick film aftermarket replacements
Replies: 25
Views: 1247

Re: Coils especially Thick film aftermarket replacements

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...
by MechRick
Fri May 01, 2020 1:58 pm
Forum: Orphan Inlines
Topic: 1984 Ford 2.3L powered Bronco II
Replies: 177
Views: 57711

Re: 1984 Ford 2.3L powered Bronco II

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...
by MechRick
Fri May 01, 2020 12:36 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Coils especially Thick film aftermarket replacements
Replies: 25
Views: 1247

Re: Coils especially Thick film aftermarket replacements

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...
by MechRick
Fri May 01, 2020 11:59 am
Forum: 240-300 "Big Block" Six Performance
Topic: Coils especially Thick film aftermarket replacements
Replies: 25
Views: 1247

Re: Coils especially Thick film aftermarket replacements

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...
by MechRick
Fri May 01, 2020 11:16 am
Forum: Orphan Inlines
Topic: 1984 Ford 2.3L powered Bronco II
Replies: 177
Views: 57711

Re: 1984 Ford 2.3L powered Bronco II

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...
by MechRick
Fri May 01, 2020 10:55 am
Forum: Orphan Inlines
Topic: 1984 Ford 2.3L powered Bronco II
Replies: 177
Views: 57711

Re: 1984 Ford 2.3L powered Bronco II

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...
by MechRick
Sun Apr 26, 2020 11:13 am
Forum: 240-300 "Big Block" Six Performance
Topic: Coils especially Thick film aftermarket replacements
Replies: 25
Views: 1247

Re: Coils especially Thick film aftermarket replacements

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 ...
by MechRick
Sat Apr 25, 2020 1:33 am
Forum: 240-300 "Big Block" Six Performance
Topic: Lost compression in cylinder 3.
Replies: 14
Views: 888

Re: Lost compression in cylinder 3.

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...
by MechRick
Fri Apr 24, 2020 2:00 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Lost compression in cylinder 3.
Replies: 14
Views: 888

Re: Lost compression in cylinder 3.

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.
by MechRick
Tue Apr 21, 2020 3:11 pm
Forum: Orphan Inlines
Topic: 1984 Ford 2.3L powered Bronco II
Replies: 177
Views: 57711

Re: 1984 Ford 2.3L powered Bronco II

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.
by MechRick
Tue Apr 21, 2020 1:01 pm
Forum: Orphan Inlines
Topic: 1984 Ford 2.3L powered Bronco II
Replies: 177
Views: 57711

Re: 1984 Ford 2.3L powered Bronco II

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

Imagetoast hampstead
by MechRick
Tue Apr 21, 2020 12:30 pm
Forum: Orphan Inlines
Topic: 1984 Ford 2.3L powered Bronco II
Replies: 177
Views: 57711

Re: 1984 Ford 2.3L powered Bronco II

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...
by MechRick
Tue Apr 21, 2020 12:03 pm
Forum: Orphan Inlines
Topic: 1984 Ford 2.3L powered Bronco II
Replies: 177
Views: 57711

Re: 1984 Ford 2.3L powered Bronco II

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...
by MechRick
Mon Apr 20, 2020 6:51 pm
Forum: Turbo, Supercharger, and Nitrous
Topic: Ford 300 Turbo Planning / Prep
Replies: 25
Views: 1379

Re: Ford 300 Turbo Planning / Prep

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...
by MechRick
Mon Apr 20, 2020 5:37 pm
Forum: Orphan Inlines
Topic: 1984 Ford 2.3L powered Bronco II
Replies: 177
Views: 57711

Re: 1984 Ford 2.3L powered Bronco II

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...
by MechRick
Mon Apr 20, 2020 3:10 pm
Forum: Orphan Inlines
Topic: 1984 Ford 2.3L powered Bronco II
Replies: 177
Views: 57711

Re: 1984 Ford 2.3L powered Bronco II

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...
by MechRick
Mon Apr 20, 2020 2:59 pm
Forum: Orphan Inlines
Topic: 1984 Ford 2.3L powered Bronco II
Replies: 177
Views: 57711

Re: 1984 Ford 2.3L powered Bronco II

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....
by MechRick
Mon Apr 20, 2020 2:46 pm
Forum: Orphan Inlines
Topic: 1984 Ford 2.3L powered Bronco II
Replies: 177
Views: 57711

Re: 1984 Ford 2.3L powered Bronco II

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...
by MechRick
Mon Apr 20, 2020 2:25 pm
Forum: Orphan Inlines
Topic: 1984 Ford 2.3L powered Bronco II
Replies: 177
Views: 57711

Re: 1984 Ford 2.3L powered Bronco II

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...
by MechRick
Mon Apr 20, 2020 2:14 pm
Forum: Orphan Inlines
Topic: 1984 Ford 2.3L powered Bronco II
Replies: 177
Views: 57711

Re: 1984 Ford 2.3L powered Bronco II

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...
by MechRick
Mon Apr 20, 2020 1:53 pm
Forum: Orphan Inlines
Topic: 1984 Ford 2.3L powered Bronco II
Replies: 177
Views: 57711

Re: 1984 Ford 2.3L powered Bronco II

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 ...
by MechRick
Tue Apr 14, 2020 2:01 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Started my build
Replies: 163
Views: 7333

Re: Started my build

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...
by MechRick
Sat Apr 11, 2020 5:57 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Intake manifolds
Replies: 62
Views: 6110

Re: Intake manifolds

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.
by MechRick
Sat Mar 28, 2020 11:21 am
Forum: 240-300 "Big Block" Six Performance
Topic: Ford headlight wiring upgraded
Replies: 20
Views: 1317

Re: Ford headlight wiring upgraded

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...
by MechRick
Sat Mar 21, 2020 5:15 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Coolant hose and solutions for sticking to pipe?
Replies: 4
Views: 678

Re: Coolant hose and solutions for sticking to pipe?

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...
by MechRick
Tue Mar 17, 2020 3:27 pm
Forum: 240-300 "Big Block" Six Performance
Topic: EFI on factory intake? Dependability?
Replies: 31
Views: 2740

Re: EFI on factory intake? Dependability?

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...
by MechRick
Tue Mar 17, 2020 1:05 am
Forum: 240-300 "Big Block" Six Performance
Topic: Next build phase-Intake and ignition
Replies: 72
Views: 5739

Re: Next build phase-Intake and ignition

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.
by MechRick
Mon Mar 16, 2020 4:08 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Next build phase-Intake and ignition
Replies: 72
Views: 5739

Re: Next build phase-Intake and ignition

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...
by MechRick
Mon Mar 16, 2020 3:44 pm
Forum: 240-300 "Big Block" Six Performance
Topic: EFI on factory intake? Dependability?
Replies: 31
Views: 2740

Re: EFI on factory intake? Dependability?

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...
by MechRick
Fri Feb 28, 2020 6:50 pm
Forum: 240-300 "Big Block" Six Performance
Topic: ROCKER ARM STUDS AND ROLLER ROCKER ARMS - A THEORY
Replies: 22
Views: 2295

Re: ROCKER ARM STUDS AND ROLLER ROCKER ARMS - A THEORY

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...
by MechRick
Mon Feb 17, 2020 6:28 pm
Forum: 240-300 "Big Block" Six Performance
Topic: A question about aftermarket TBI?
Replies: 29
Views: 3154

Re: A question about aftermarket TBI?

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...
by MechRick
Thu Feb 13, 2020 11:27 am
Forum: 240-300 "Big Block" Six Performance
Topic: Odd ignition problem.
Replies: 11
Views: 1950

Re: Odd ignition problem.

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...
by MechRick
Tue Feb 11, 2020 4:48 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Variable Venturi carb
Replies: 5
Views: 1298

Re: Variable Venturi carb

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...
by MechRick
Tue Feb 11, 2020 1:24 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Variable Venturi carb
Replies: 5
Views: 1298

Re: Variable Venturi carb

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. ...
by MechRick
Fri Feb 07, 2020 11:32 am
Forum: 240-300 "Big Block" Six Performance
Topic: Picked up a Turbo
Replies: 58
Views: 5305

Re: Picked up a Turbo

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...
by MechRick
Tue Feb 04, 2020 11:54 pm
Forum: 240-300 "Big Block" Six Performance
Topic: valve & lifter covers
Replies: 11
Views: 2517

Re: valve & lifter covers

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...
by MechRick
Tue Feb 04, 2020 12:44 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Need some advice..
Replies: 12
Views: 1638

Re: Need some advice..

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...
by MechRick
Fri Jan 31, 2020 11:50 am
Forum: 240-300 "Big Block" Six Performance
Topic: Picked up a Turbo
Replies: 58
Views: 5305

Re: Picked up a Turbo

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...
by MechRick
Thu Jan 30, 2020 11:32 am
Forum: 240-300 "Big Block" Six Performance
Topic: Picked up a Turbo
Replies: 58
Views: 5305

Re: Picked up a Turbo

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...
by MechRick
Wed Jan 29, 2020 9:13 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Picked up a Turbo
Replies: 58
Views: 5305

Re: Picked up a Turbo

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...
by MechRick
Wed Jan 29, 2020 4:05 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Picked up a Turbo
Replies: 58
Views: 5305

Re: Picked up a Turbo

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...
by MechRick
Wed Jan 29, 2020 12:07 pm
Forum: Orphan Inlines
Topic: Pinto 2.3
Replies: 14
Views: 2530

Re: Pinto 2.3

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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