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EFV-8 Club Forum / General Ford Discussion / flathead running poorly

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carcrazy

09-15-2019 @ 7:18 AM

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Are you using the 1941 Distributor? Double check the secondary ignition wiring. Make sure that each wire coming out of the distributor is going to the correct spark plug. There might be cross firing taking place. Also check the brush on the bottom of the coil to make sure it is making good consistent contact with the rotor.

rustedorrotting

09-15-2019 @ 6:20 AM

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bought the engine in 1990. It was setting on an engine stand covered in plastic. It was supposedly overhauled in 1975 and never installed in a vehicle. I bought it because it because it had all the dress up parts that i was looking for Edlebrock intake for 3 deuces, Offenhouser heads and tube headers. Pig in a poke right but i paid less for the engine then it would have cost me for the parts. Also i had the engine that came with the truck, supposedly a 100 horse mercury ( how do you tell? ) that ran fine. I took the crab distributor from the merc and bought 3 carbs in pieces from several swap meets. I dont know what cam is in it or anything else about it. It first ran about 3 years ago and sounded fine. I have checked the distributor and cap and ran a comp test. With high compression, i think i can rule out a stuck valve, also the fuel pressure gauge wont maintain pressure after i shut the engine down, so probably a blown power valve. The secondary carbs are all show for now as the fuel has been stopped at the inlet and they have block off plates below. Not sucking air, i checked with carb cleaner. It has dual exhaust. The vacuum is at 13 to 15 inches and fluctuating erratically. Sounds like a sticking valve.

09-14-2019 @ 6:41 PM

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Excellent compression!

Is it backfiring out the exhaust or out the carb? If it's backfiring through the carb you've blown the power valve. Make sure that the spark plug wires are plugged in correctly at the distributor - 1 to 1, 2 to 2, 3 to 3, etc. What are you using as a switch for the electric fuel pump? Given the vacuum reading, you might have sticking valves. Tell us more about the engine. Has it been sitting idle for a long period of time?....

rustedorrotting

09-14-2019 @ 2:18 PM

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I have a 41 ford 1/2 ton truck with a flathead v 8. I recently got it running kinda. I have been a mechanic professionally my entire working life, so i am not new at this. Engine runs, but backfires. Back to basics, checked compression, 165 plus all 8 cyl's. still backfires. I have the wires in the black metal tubes. Should i run a different wire loom? Also i have installed an inline electric pump for priming and a new pump from Ken Isidor. I have also installed a pressure regulator and gauge ( 0 to 10 psi ) set at 2 pounds. The electric never quits running and after i turn the engine off, the pressure goes to zero after a few seconds. Bad power valve? Any help would be appreciated. BTW, vacuum gauge fluctuates from 13 to 15 pounds like a bad valve

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