Cylinder compression??? - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 03-16-2007, 10:51 AM Thread Starter
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Cylinder compression???

I have to start working on my '99 350 7.3L tonight. I've got blowby in a cylinder, so she's parked until I get her rebuilt. After looking for days, I still can't find any specs about what compression I should expect on a properly-functioning cylinder. Can anyone help? I need to run a compression test first thing.
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post #2 of 7 Old 03-16-2007, 11:07 AM
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370-400 psi, on a good engine. As low as 350 will still run.

99.5 F-250 PSD AT 4x4, 4in lift, 37 13.5 18 Pro comp Extreme A/T's, S&B Intake, GTP38R, DP Tuner custom programs (140 Agg., 120 sled pull, 80 tow and 60 tow), Rosewood DIY stage 2 injectors, BTS Trans, 5in exhaust no muffler, 6 oh intercooler, Ford AIC, EBPV delete, Foil delete, T/C lock up mod, Pusher Fuel Pump, Three Chime train Horns

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post #3 of 7 Old 03-16-2007, 11:10 AM Thread Starter
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Thanks, I've heard all kinds of numbers, but yours seem to be the most reasonable. I couldn't imagine an engine carrying 500 psi like a couple folks suggested somewhere else.
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post #4 of 7 Old 03-16-2007, 11:14 AM
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No way will thay have 500 psi. I think 420 is the highest i've seen and thats becaus it had a little oil in the cylinder

99.5 F-250 PSD AT 4x4, 4in lift, 37 13.5 18 Pro comp Extreme A/T's, S&B Intake, GTP38R, DP Tuner custom programs (140 Agg., 120 sled pull, 80 tow and 60 tow), Rosewood DIY stage 2 injectors, BTS Trans, 5in exhaust no muffler, 6 oh intercooler, Ford AIC, EBPV delete, Foil delete, T/C lock up mod, Pusher Fuel Pump, Three Chime train Horns

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post #5 of 7 Old 03-16-2007, 01:53 PM
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as far as compression ratios, i have heard rumors as far as 19:1 after being turboed, but dont quote me, i am not possitve. i have never read anything to know for sure

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post #6 of 7 Old 03-17-2007, 12:35 PM
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350 is bare minumum!!!!
320 is to low to combust the fuel....
I had a truck in my shop about a month ago that averaged 550psi except for one that was 350.
Make sure and use a reputable compression tester that at least goes to
1000PSI if you use one that goes to 500PSI and you have a cylinder that goes to 550PSI you could have problems(trip to ER)
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post #7 of 7 Old 03-17-2007, 12:43 PM
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i used to have an '89 Ford Diesel years ago. per the Chilton manual that i had, the compression was about 21.5 to 1. i now have a '96 and the compression is about 17.5 to 1. don't know if that helps................

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