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Old 04-20-2011, 03:41 PM
tonyjklh tonyjklh is offline
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Default compression test

ok so i did a compression test the other day and want to see what you think of the results, i dont know what normal compression is for this engine, so thats why i need to ask.
oh and its a 1990 4.0 ohv with 175000 miles.
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Old 04-20-2011, 03:50 PM
richarddhoward richarddhoward is offline
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Default Re: compression test

She's tired but those numbers are not bad. I have a 97 OHV 4.0, last time I did mine, average was 175 PSI all cylinders plus or minus 10 psi, and less then a 6 percent leak down. My truck also had about 60k on it at the time, I am at 94000 now
97 Ranger - 4.0 V6 auto, 4wd, 31x10.5x15s Wild Country XTX Sport All Terrains, Warn locking hubs, Pioneer deck with iPod attachment, Snugtop Topper, K&N filter, scan gauge II, Hella 500 Lights, More parts coming, waiting for the paycheck to get bigger!

Truck built in loving memory of Norm Howard
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