Does anyone know what the compression readings should be for a 996TT? (PSI) I've searched and checked the maintenance manual to no avail. Want to know if a car I am considering is good.

Thanks

 

Mine were 115 psi minus or plus 1 psi per cyl

 

Nice,,all of them right on with no noticeable variances..
I was expecting as in most engines between 5psi an 10 psi which is still normal for a street motor.

 

The video he sent me showed 210 psi.....?????

 

I wouldnt be overly concerned about the actual reading (with in reason) as long at they are balanced. If there's any real concern, leak down test the engine.

 

Thanks for the feedback...according to the owner this car was tuned by your shop.

 

Just a WAG but with the engine's (stock) 9.4:1 compression ratio I'd hazard a guess best would be around 138psi. Actual would be lower not necessarily due to any problems but from less than 100% cylinder filling and with some valve overlap.

Why are you pressure testing the cylinders?