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Discussion Starter · #1 ·
i'm tryin to get the motor(360) in my truck fired up and it just wont do it. it cranks over just fine, timing is good, sounds farily even when cranking so i figure i'm good to go with the compression issue. i get kinda puzzled so i pull all the plugs for a compression test and i find:
#1 = 110
#3 = 90
#5 = 60
#7 = 60

#2 = 90
#4 = 90
#6 = 70
#8 = 60

4 cylinders have half the compression my old 360 in my jeep did. i noticed that the 4 rearmost cylinders have the lowest compression, any ideas before i rip my cuda motor out and install it in the truck(with a smaller cam of course)?:rolleyes:
 

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Try a good squirt of engine oil (like half a teaspoon) in each cylinder, then re-run your compression test. If it's much better it's rings, if not then valves - but at minimum you're looking at pulling the heads to fix it. Also, if you can run your compression tester in a leakdown mode, it's possible to diagnose a scored cylinder wall by slowly rotating backwards through the compression stroke. Sorry to hear this. :(
 

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Discussion Starter · #6 ·
my problem is the truck needs to move soon, the cuda(chassis wise) is not up to par(or is that mopar) and i have no money to put into the engine thats in the truck right now. the cuda is comin apart this summer anyways to start fiddling with it so this seems like the wise option at this point.:(

thanks for the tips Llyod, i'll keep those in mind.;)
 
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