I've been, not so patiently, waiting for some #'s with injection.....and a decent distributor- wondering if the bad one was one of the hei units. I'm about to trash the cheap one I have on the wheezer.
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'77F1504x4, '75 f250crew4x4, '79 Bronco 429, '83 bronco, '72 Torino with 351cj, 70 1/2 falcon, 75 stangII. all projects, 2 on the road. One pissed off wife!
I have some bad news to report on the EFI 434. We were not able to reproduce the numbers that we got with the carb, then we lost a head gasket.
I am going to head back home without my motor. Tim is going to replace the head gasket, and dyno it again with a carb. I will install the EFI, when I get it home.
It appears that the EFI setup is barely equivalent to a 650 CFM carb. If I want to get more out of it, then I need to improve the TB/intake system. First I have to find where the restriction occurs.
The head gasket might have started leaking when we had some initial timing issues.
The setup is still OK for moderate performance or a smaller motor. If some restrictions can be eliminated, it could do better. The Lightning MAF only supports about 770 CFM, which is surprising. I am going to investigate that as well as the pressure drops.
Do you think you may have lost power with the EFI because of a head gasket issue during dyno run?
That is a possibility! Tim is going to fix the head gasket and dyno it with a carb. Then I will take it and try to match the dyno air flow and manifold vacuum with a decent fuel/air mixture.
what brand/part number head gasket was that? i read quite a few posts of the "top shelf" exotic graphite laminated steel shim yada yada yada brand gaskets failing quickly after a build. i like the Fel-Pro 8347PT-1, they list it as an "economy" gasket but it's my go-to favorite. i ran an 11.5:1 rattling Cleveland on goat piss pump regular in between stops at the airport and those head gaskets never gave up!? some guys get irate about using any coating on a head gasket, i've used them with aluminum spray paint, spray copper and dry, never had a failure any way i installed them. the spray coating even made it possible to re-use a pair once when a rod bearing overlapped 3 days into a build. the rods were not checked out and i ran them as-is. Doh. but the head gaskets ran again without issue!
i'll be surprised if you say they were the cheap Fel-Pro Blues!?
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Show all the luv ya can while ya can. Or one day ya may be alone Don't just Modify it Fordifiy it
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