wornknobby

how much compression do you huys think my 89' cougar 500 should have?

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90' CR 125
2x 89 Cougar 500's
86 1/2 Nissan 4x4 shortbox
-posi locked
-31's
2x 91 Honda Accord's

BC_Dan

between 120 and 140 is normal, depending on elevation (lower elevations make more compression, there's more air per stroke to compress.) Under 110 is showing some ring wear, under 100 and it's hard to make good power with 'em.

The difference in compression between cylinders is as important as high compression. Cylinders should be about the same, if one is a lot higher or lower than the other, there could be a problem.

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Rebuilding the fleet!
2008 RMK 600 155", 2006 RMK 600 144", 98 Indy 440, 95 Prowler 550 2-up, 1990 Indy 650

RIP, destroyed by fire 1-22-2008
04 RMK 800, 05 RMK 600, 02 RMK 800, 97 RMK 700

wornknobby

wow, cool, i musrt be doing good then cause i just checked them and their both at 150 psi. i guess my runability problem isn't in my compression. they hold the pressure for a while too, thanx

__________________
90' CR 125
2x 89 Cougar 500's
86 1/2 Nissan 4x4 shortbox
-posi locked
-31's
2x 91 Honda Accord's