TREESnoseeds787

Ok. So my buddy is selling me a Greddy 18G kit and intercooler for a fairly decent price.

I have a BONE STOCK GSR motor. The previous owner claims there are P30's in the block, but I cannot confirm this.

I did a compression test today, and here are the results:

#1)181 #2)181 #3)215 #4)185.

Am I safe to boost this motor on 8-9psi? I does smoke a LITTLE at high rpms, but for the total price I would have in the car after I boost it is still less than what I sold my previous basically stock LS hatch for, so i figured what the hell.

Help?

Schister66

your compression test results seem a little off....i would investigate that before doing anything further

Cole D

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TREESnoseeds787 &raquo;</TD></TR><TR><TD CLASS="quote">Ok. So my buddy is selling me a Greddy 18G kit and intercooler for a fairly decent price.

I have a BONE STOCK GSR motor. The previous owner claims there are P30's in the block, but I cannot confirm this.

I did a compression test today, and here are the results:

#1)181 #2)181 #3)215 #4)185.

Am I safe to boost this motor on 8-9psi? I does smoke a LITTLE at high rpms, but for the total price I would have in the car after I boost it is still less than what I sold my previous basically stock LS hatch for, so i figured what the hell.

Help?</TD></TR></TABLE>


You need to figure out what's up with cylinder number 3 but I say go ahead I'm boosting a civic with well over 100k miles- 315hp/11 psi my compression reading were lower than yours.

TREESnoseeds787

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Cole D &raquo;</TD></TR><TR><TD CLASS="quote">You need to figure out what's up with cylinder number 3 but I say go ahead I'm boosting a civic with well over 100k miles- 315hp/11 psi my compression reading were lower than yours.</TD></TR></TABLE><TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Cole D &raquo;</TD></TR><TR><TD CLASS="quote">You need to figure out what's up with cylinder number 3 but I say go ahead I'm boosting a civic with well over 100k miles- 315hp/11 psi my compression reading were lower than yours.</TD></TR></TABLE>

Yeah I don't know what's going on with #3.. I tested my compression with the engine fully warmed up, and the gas to the floor.. 1, 2, and 4 are awesome, but number 3 has me stumped.

I mean, at least it's not low but why is it so much higher than the rest? Anyone have any ideas?

Cole D

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TREESnoseeds787 &raquo;</TD></TR><TR><TD CLASS="quote">

Yeah I don't know what's going on with #3.. I tested my compression with the engine fully warmed up, and the gas to the floor.. 1, 2, and 4 are awesome, but number 3 has me stumped.

I mean, at least it's not low but why is it so much higher than the rest? Anyone have any ideas?</TD></TR></TABLE>

Not sure on that one my numbers were 160 psi across the board I put a cap of oil in each cylinder and retested got 190 psi here's the post for reference.

TREESnoseeds787

So should I put a small amount of oil directly down the spark plug hole on 1,2, and 4? And then retest compression?

Or just leave it how it is, put it on 8psi, and give it a good tune?

Cole D

Small cap full of oil will let you know if your rings are worn try it in #3 as well. A leak down test would be more helpful. Just remember the normal stuff.... make sure the car is at operating temps unplug the distrubtor and remove the fuel pump fuse. Let us know how everything turns out.

Cole D

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TREESnoseeds787 &raquo;</TD></TR><TR><TD CLASS="quote">So should I put a small amount of oil directly down the spark plug hole on 1,2, and 4? And then retest compression?

Or just leave it how it is, put it on 8psi, and give it a good tune?</TD></TR></TABLE>

General rule of thumb you want your compression numbers with 15% of each cylinder your 15%is 213( I used 185psi) so go ahead and give it a try and let us know how you turn out

SIXTY-1HATCH

pull the plug on #3 and look in there to see if there is oil on top of the piston.