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Old 05-19-2020, 07:57 PM   #1
Fetch
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Default unequal exhaust pressure

Got a question about an 80" shovelhead exhaust pressure at the end of the pipe. The front cylinder seems to have slightly more 20-30% more pressure at idle then the rear cylinder. (Not an actual measurement, just a hand behind the pipe.)

I've got:

120psi both cylinders cold
Andrews J cam
Solid Lifters
Paughco 735D exhaust
Plugs look equal and toasty brown


The push rods are adjusted so that I can turn them with dry fingers. During the set up , I had to adjust them several times since I'd get a tap once the engine warmed up ( usually exhaust side) . Got that sorted, except for the uneven exhaust pressure. Any help?

Last edited by Fetch; 05-19-2020 at 08:38 PM.
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Old 05-19-2020, 08:58 PM   #2
joe49
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Default Re: unequal exhaust pressure

To be expected with the rear having more bends, aka more restriction. Does it matter, not really for a street cruiser.
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Old 05-20-2020, 08:32 AM   #3
Fetch
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Default Re: unequal exhaust pressure

Thanks
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