Compression?

[dank GN]

What is the compression on a stock motor

 

[dank GN]

1=125psi 3=128 5=135 2=130 4=120 6=140 that's what i got for compression on the cylinders

 

[mikestertwo]

1=125psi 3=128 5=135 2=130 4=120 6=140 that's what i got for compression on the cylinders

They're a little low.

 

[dank GN]

My GN has 80,000 on the stock motor. Where should they be at?

 

[jrv6gn]

Compression should be at least 150 psi or close to it.

 

[bad V6]

At 78k miles, the compression numbers from mine hit between 167 & 171.

 

[stagemonster]

160 range is normal

 

[Jerryl]

Well, interesting enough, I did some calcs this weekend on this subject.
Pressure = Dynamic CR * 20
So, it seems that a stock 8:1 motor with the stock cam wold be in the 140-160 range.