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Old 02-07-2024, 12:22 PM   #23
JP1738
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Default Re: Too Slow/Q-Jet question

Update on some of the things mentioned yesterday:

-In order by cylinder #, here are the compression and leak down results from last night where compression is first and % leakage at 100 psi of pressure is second. Testing was done while the engine was warm and leak down tests were performed at TDC for each cylinder:
150/94 155/92 145/93 150/94 155/97 146/94 155/96 145/90

-I flowed the fuel line into a 1 gallon bucket and it took 37 seconds to fill it up

-I took the fuel filter apart and checked it for junk. It had very little if any trash in it. It's a very high micron filter so I don't see it as a restriction, so I put it back on the car. I'm not hell bent on having it, I just like the peace of mind

-the regulator is mounted on the fender well and the fuel line runs straight across the engine bay to the carburetor perpendicular to the direction of motion with a -6 line. Given the flow rate I feel comfortable I don't have a fuel delivery issue, but if you disagree please let me know.

-also, I went back and slow-motion watched the in car footage from the runs and at no point during the run does the fuel pressure drop below 6 1/4 pound. This tells me that despite the Gs of acceleration, my pump keeps up/doesn't care about it.

-As I stated yesterday, I've got an intake and carb coming to try, curtesy of Tim Stickles (thanks again man, you're a stud!). I'm anxious to see if/how much better it is than the one I have now. It could be all of the problem or none of it. Just don't know yet.
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Dawson Pauley
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#2827 S/ST 1978 Mazda RX7 w/ 383 sbc/glide

Last edited by JP1738; 02-07-2024 at 02:39 PM. Reason: Giving credit to T-Stick!
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