I doing a compression test today on my gsr turbo with 84mm 8.4:1 wiseco forged pistons What should the numbers be around?


Modified by boosted1993 at 4:00 PM 8/23/2006


Modified by boosted1993 at 4:56 PM 8/24/2006

 

on my 9:1 its 180 so i would imagine 160-170? I cant remember what my old 8.5:1 setup was.... main thing is consistency across all 4 cylinders...

 

I'm reading much lower than that on all four with 8:4:1

 

ohhh **** 80 is pretty freakin low

you sure you tested correctly? car warm unplug dizzy crank 5-6times per cylinder?

 

Where did he say 80?
Is this on a new build?

 

he edited his post...
boosted1993 (4:02 PM 8/23/2006): hey bro i got 80 across all four cylinders with weisco 8:4:1

anyway, do one plug at a time, and unplug the dizzy thats how i do it, see if you get the same #s if so, you probably have an issue...

 

I ended up puting a little oil down in the cylinders and ran the test again and the #'s went to 120.

I'm going to replace the rings next weekend

 

remember to be wide open throttle, VERY important in compression tests

 

done

 

what numbers should i be looking for on new rings when I'm done?
remember they are 8:4;1. I'm thinking some where around 130

 

Thats about right. It will be a little low on a new motor but still in the 100s.

 

I'll post some numbers when I get it rebuilt....couple weeks.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boosted1993 &raquo;</TD></TR><TR><TD CLASS="quote">I ended up puting a little oil down in the cylinders and ran the test again and the #'s went to 120.

I'm going to replace the rings next weekend </TD></TR></TABLE>

damn, sounds like rings or even, hate to say it, ringlands. good luck.

 

Xsi-t's engine at 8.8:1 yielded 170 across

 

wow that some high numbers