I just bought a '94 Integra GS-r with a "stock" LS motor in it. I did all the tests to make sure everything was good in it.

Here's the issue, I ran a compression test and got 210psi for all four cylinders! 180psi is supposed to be a strong motor so 210psi is caused by something aftermarket, right?

What could cause that drastic of a change, high compression pistons or milled head?

Thanks for any help!
-D

 

Why would a GSR have a stock LS motor in it? If it is and LS B18B not B18C than the compression is high and has to have a set of pistons, thinner headgasket, decked/milled head or something else that would add to it's compression. Doesn't need all of these to make that kind of compression; are you sure it is an LS block?

 

well my stock gsr motor put 250psi in all 4

 

I doubt it

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by qfast817 &raquo;</TD></TR><TR><TD CLASS="quote">well my stock gsr motor put 250psi in all 4</TD></TR></TABLE>

fail.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by STD ****** &raquo;</TD></TR><TR><TD CLASS="quote">

fail.</TD></TR></TABLE>

Thank you

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by qfast817 &raquo;</TD></TR><TR><TD CLASS="quote">well my gsr motor with thin head gasket, ctr pistons, and a milled head put 250psi in all 4</TD></TR></TABLE>

there you go. or this

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by qfast817 &raquo;</TD></TR><TR><TD CLASS="quote">well my stock gsr motor put 200psi in all 4</TD></TR></TABLE>

 

LMAO

 

Thanks guys. It's non-Vtec and the guy i bought it from said he put a stock LS in it...

Of course that is what the guy he bought it from said.

 

Are there any markings on the block that I should look for?

What combinatioin would give you 210psi on a LS block...basing that off of a strong 180psi motor?

 

um, shaving/milling the head, using a thinner head gasket, higher compression pistons will give the engine higher compression. in all the LS compression results ive seen here, or anywhere, ive never seen an LS hit 210. are you sure its an LS? does the block say b18a1 or b18b1?

 

consistency is key when looking at compression numbers.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by .brian. &raquo;</TD></TR><TR><TD CLASS="quote">consistency is key when looking at compression numbers.</TD></TR></TABLE>

QFT.

 

Where are the markings that will tell me what kind of motor this is?
The numbers are consistent across all 4 cylinders.

Thanks guys, your making the cross-over from Dodge to Honda go very smooth!

 

Right next to the header next to the tranny

 

on the block, in between the cylinder head and exhaust manifold, on the left. you might not notice it unless you clean it off; the stamping will be hard to see if the block is as dirty as they usually are.

 

Thanks! I will check it in the morning and let you know tomorrow!