cypressink

So my 97 GS-R is sounding like a wrx.
Here are my mods(Although irrelevant but i'm sure someone will ask):
Comptech intake
Dc sports 4-1 header
Feel's Exhaust.

i did a compression check and here's what i got:
Cylinder one being the one farthest from the Distributor:

Cylinder 1: 210 psi
Cylinder 2: 180 psi
Cylinder 3: 0 psi(not a typo it is was at 0)
Cylinder 4: 210 psi.

I'm betting a bent valve.
anyone know of any other tests i should do before pulling the head off?

Jtuned DC2

you gotta dead cylinder... Thats why it sounds like a WRX. haha cmon now.

cypressink

haha ok. ~__~! thanks for stating obvious but obviously you were being a sarcastic. i think i'll jsut pullt he head out. i was hoping there was a way to distinguish between a bent valve and piston ring blow by

alexisthemovie

misshift?

__oversea

you can do leak test, see what valves are bent.

Nors

Yep do a leak down test.

WalkerGSR1

what caused the car to start running like that?

DC4KiD

iTrader: (4)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by WalkerGSR1 &raquo;</TD></TR><TR><TD CLASS="quote">what caused the car to start running like that?</TD></TR></TABLE>
Yes... please tell us.

ANONYMOUSdeecee

check the 3rd injector and wires that run to the injectors

1998b18c1

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ANONYMOUSdeecee &raquo;</TD></TR><TR><TD CLASS="quote">check the 3rd injector and wires that run to the injectors</TD></TR></TABLE>
injectors have no bearing on a 0 psi reading on a cylinder, he has a dead cyl b/c there is no compression....injectors supply fuel.

cypressink

i mis shifted awhile ago, but it was running fine with no CEL and it still has no CEL light. I even ran it at CMI on march 31-april 1st. and drove ti all the way back to san jose, than drove ti for another 1 or so before it started sounding liek a suby. i'm looking for a motor to swap in and drive before i pull this one apart. I'm pretty sure ti's a bent valve. not to mention that it was burning a quart oil every day.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kangpreza &raquo;</TD></TR><TR><TD CLASS="quote">you can do leak test, see what valves are bent. </TD></TR></TABLE>

I dont see a point, cant' do a leakdown if the cylinder doesn't have compression in the first place.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1998b18c1 &raquo;</TD></TR><TR><TD CLASS="quote">
injectors have no bearing on a 0 psi reading on a cylinder, he has a dead cyl b/c there is no compression....injectors supply fuel. </TD></TR></TABLE>

burn! but he is right.

I'll pull the motor prob this weekend and take some pictures. See what got deformed in there.

thewrai6th

A leakdown can tell you what is damaged. Depending on where it's leaking from, you can get a good idea as to where to start.
Intake = intake valves, exhaust = exhaust valves, coolant overflow/radiator = head gasket, oil cap = rings or something bad etc. etc...

cypressink

what i was saying was that the cylinder 3 holds no compression whatsoever.(the needle doesn't even budge when i crank.) so, doing the leakdown on cylinder three would be impossible.

I'm using these directions. if your thinking my idea of a leakdown is retarded.

https://honda-tech.com/zerothread?id=1863822.

3ghandles

you have bent valves guaranteed

thewrai6th

The point of the leakdown is to find out where it's leaking. We already know it's leaking (bad) because you have 0 compression, but where is it leaking from?

The post above says valves for sure. If thats the case, the compressed air will shoot out of your exhaust or intake, even with the cylinder at TDC and the valves are (supposed to be) closed...

If it's your valves, then there's no reason to pull the block...yet.

thewrai6th

Valves are a good guess, did you pull the valve cover and inspect the rocker arms/tappets?

3ghandles

i had a similar problem like this and it was bent valves, yes your car sounds like a damn wrx pull that head of regardless. its your head

thewrai6th

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 3ghandles &raquo;</TD></TR><TR><TD CLASS="quote">i had a similar problem like this and it was bent valves, yes your car sounds like a damn wrx pull that head of regardless. its your head</TD></TR></TABLE>
This is probably correct, as the blown HG would give you some compression, and you would (should) know if you bent a rod (knock, knock, knock) or threw a piston through the girdle.

I just wanted to make sure that people didn't think this: "I cant' do a leakdown if the cylinder doesn't have compression in the first place." You're going to have 90-100% leak, but you will know where it's leaking from.

Pull the valve cover and take a look at those rockers.

cypressink

well the heads off for awhile now, i reinstalled a ported race head some guy ran 12's with in a EG. it'll be up and running soon, and as for the bent valve...a 1/4 or the valve was missing from one fo the exhaust valves on cylinder three..=*( but thanks for the help guys. let me know if you want pictures because this is the first time i've ever seen something like this.

vtec_bangeR

i remember when my car sounded like a WRX. sounds pretty bad azz...to bad it doesn't want to pull untill i go above 4-5 RPM. the problem with mines was that the mechanice jackd up my valve adjustment.

projectTeG

i didnt have a dead cylinder when i had bent valve, the motor would just spin like there was no plugs in it. i made like 30 psi,