210 psi in all cylinders on a GSR with 60.000 miles, how is this?


Thanks.

 

is it stock?
i doubt...

 

Followed the procedures from C-SpeedRacing.com exactly and got 210psi across the board. Is that high for a stock motor.


[Modified by digitalspice, 1:09 AM 11/4/2002]

 

that's good. motor sounds pretty strong still.

 

thats real nice

 

I have never done a compression test...

i got a detailed instruction from http://www.c-speedracing.com , but i dont under stand when they say push the gas to the pedal and crank the motor......

wut does crank refer to? sorry if its a dumb question, but i dont want to mess this up when i try it. crank as in turn on the engine 5 times?


[Modified by MintyDip, 12:04 AM 9/15/2001]

 

Crank the motor over, as in starting the motor. Although, You'll have the spark plugs and ECU disconnected, so it won't start, the starter will just crank (as in turn) the motor over. You let it turn over about 5-6 times and that's probably all you need.

 

I did a compression test on my 1st generation b16a after I finished swapping it in. I got 230, 225, 220, 230.

I know it's not suppose to vary more than 20psi from cylinder to cylinder, but is this ok?

It's a stock 1st gen b16a with ITR manifold. I took the intake piping and filter completely off (cuz of something else). I also disconnected wires going to each fuel injector and took out all the spark plugs and plug wires.

 

Mine had 200 in every cylinder. Is that good? I have a 95 GSR with 97,200 miles on it?

 

These are all good numbers. Obviously, as time and miles come the psi will come down due to wear. What you really care about is the variablity between cylinders. Like mentioned before, you do not want more that 10% between cylinders. So if the highest psi is 200, you do not want any cylinder below 180.

 

175 180 180 180 after hitting 10,000 rpm all i need is a valve adjustment which i am getting today. oh and the reason it is so low is b\c i have a 99 b16 head on a 00 gsr block (yeilds about 9.8-1 compression)
nuy usually i am at 190 across

 

Kewl, Wanted to get an idea of what the average was among the other members.

Couldnt beileve how easy this was to do and a shop wanted to charge $75.00 to do this.

 

where can i get a compression tester, how much does it cost? i want to do this to my engine. thanks a lot!

 

I got mine from sears for $25. It is probably not the best compression tester on the market but it does the job.

 

Why do they want you to put the gas pedal on the floor?

 

It is (trivially?) harder for the motor to suck air in with the throttle plate closed.

Dustin

 

Just unplug the distributor and you will be fine

 

No, no, no.

Pull the ECU fuse. Just unplugging the distributor only removes spark, you want to make sure you don't dump fuel in the cylinders while testing.

 

Ive gotten a accurate reading and i always leave the ecu plugged in along with the fuse

 

now im confused on wut to unplug.......

 

Just take out the ECU fuse. Do it how the Helms manual recommends.

 

If you leave the ECU fuse in, you dump tons of fuel in the chamber with no spark. You can get a lower reading this way because the extra gas gets rid of the oil seal. You also end up with a small amount of gas in your oil. In addition, your car is not going to want to start up directly afterwards because the combustion chamber will be dripping with gas... heh.

Dustin

 

A-ha. Seems so obvious now.

--Karl, who is happy with 6% leakdown and 190-195psi compression...after 123K miles, 20 track events, countless autocrosses, and a lifetime of Mobil 1 since new

 

thanks Yyz!