i recently posted up about my brothers motor that is burning lots of oil and making funny sounds ( havent heard them myself....so i cant say what they are) ......but anyways

here is the setup:

B18B
Arias 10.5:1 CR slugs
Crane cams
etc etc...

the mechanic who built the engine told him that the compression is actually a little lower than 10.5:1 because of cam overlap....is this BS ?

so now we are going to do a compression check to see how healthy shes doin....

What compression should would be healthy for this block ?
i estimated about 210-215 psi.....
any thoughts ?

 

as long as there is no 20% deviation from the average #'s then it should be fine.

edit: i meant the compression should be fine, not necessarily the engine


[Modified by In7egrity, 12:24 AM 9/18/2001]

 

does anybody have an estimate of healthy compression ?

 

it was just stated... as long as there is no more than 20% deviation between the #'s then the compression is fine... there is no specific # it should be at

 

I hope he`s lower than 10.5:1 if he`s boosting. Didn`t you say he was running like 9-10lbs on the other board?

Ryan

 

it was just stated... as long as there is no more than 20% deviation between the #'s then the compression is fine... there is no specific # it should be at


i understand this, i was just curious as to what it should be...

ryan, no he is not running boost. I cant think of where i said that he was...

 

my bad, though you said that on ha.net

 

just curious.....is there ever a situation where all cylinders will have bad compression ? I know its usually just one or two, but does it ever happen to all 4 ?