good compression numbers?

[humpy012]

I was told to check compression, so i did:

1 200
2 190
3 180
4 175

are these good enough for a 50 shot on my ls of 160k miles?

[bonestock94]

all 4 of your clyinder compression #'s should be within 10-15% of each other. try running your car through with some seafoam or something of that nature and see if you can clean out some the the blowby/carbon deposits that might be causing your cyclinders to have such different readings.

my f22b1 read like around 175 all across i think

[humpy012]

seafoam???? is that a gas additive or something?

[bonestock94]

kinda of like a carb. choke cleaner but for EFI cars.

i have a friend that uses 99% alcohol and cleans it with that via spraying it into intake manifold. my first compression reading was simular to yours but not off by as much as yours and my friend ran my car thru with some seafoam and i read almost 175 all the way across.

[humpy012]

should i disconnect the intake piping and spray it in while the car is running?

[bonestock94]

how to on a z28, but its the same idea.

http://w3.one.net/~roz/cars/z28/seafoam.html

you can do either way using the brake booster vacuum or spraying into the throttle body.