View Full Version : Compression and vin decode


corbaprince
03-11-2008, 11:26 AM
I know the compression of all of my valves( I just checked them) But how do I figure out the compression ratio now?

And can someone please help me decode my vin and tell me what type of engine I have? :
JB3AM44HXRY0XXXXX

thestealth
03-11-2008, 11:39 AM
Show me a picture of it and I'll tell you what you have...

You either have a SOHC 3.0L or a DOHC 3.0 NA or TT.
The compression of the NA DOHC is 10:1, the TT is 8:1, and I think the SOHC is 8.9:1 providing everything is stock.

corbaprince
03-12-2008, 08:29 AM
How do I figure that out though? My compression guage read that I have 150 in all but two chambers and in those I had 165 and 170.

thestealth
03-12-2008, 11:39 AM
You don't calculate the compression ratio of an engine by doing a compression test.

corbaprince
03-12-2008, 11:55 AM
So how do I calculate it then?

thestealth
03-12-2008, 12:07 PM
http://www.rbracing-rsr.com/compstaticcalc.html

corbaprince
03-13-2008, 08:41 AM
Is there an easy way to get those measurements?

And do you know of what the range my compression should be at?(I mean not the ratio just the compression of the chambers)

thestealth
03-13-2008, 09:25 AM
What engine is it your car?

corbaprince
03-13-2008, 10:54 AM
It is either the DOHC orthe SOHC. I can not tell. How will I know? I thought the vin number would tell me but I do not know how to decode it.

thestealth
03-13-2008, 11:16 AM
Do you have a digital camera? With a quick pic, I'll tell you what you have.

corbaprince
03-13-2008, 11:21 AM
Yes, I will take a pic of it right now. Give me less than ten minutes.

corbaprince
03-13-2008, 11:30 AM
Here are a couple of pictures. Just let me know what you think and/or if i need more and/or better pictures.

corbaprince
03-13-2008, 11:36 AM
Sorry, that was defintly NOT the engine. Here it is, I am sure this time.

thestealth
03-13-2008, 11:55 AM
Can't see the pictures..?