ok i have a b20b gsr semi built head and t3/4 turbo pushing 10psi.

heres what is going on. i bought the car and it had ok compression around 185.
then i started seeing smoke some did another test and they came in
#1 75
#2 100
#3 105
#4 100

so i said to myself do a headgasket because it would run hot comming up hills. so i replaced the head gasket. did another compression check and
#1 80
#2 115
#3 120
#4 90

so at this point im pissed off seeing that it wasnt the gasket. so i read up on things and found that a i should test my rings. so i bought a leak down tester and could hear air excaping from the block so hey its my rings.
so i replaced my rings last week. did a whole rebuild had the machine shop hone the cylinders and mirco polish the crank.

got the car running and did another compression test.

#1 120
#2 125
#3 115
#4 90

but im not getting any smoke like i used to. so where do i go from here? im stumpped and pissed off.

 

adjust valves make sure timming is spot on and recheck comp again

 

have a nice day

 

ya i need to read up on how to adjust the valves. i just came over from sohc. the timming is dead on.
and they are stock cast pistons. i looked at them and didnt see anything wrong. but i didnt go over it with a fine tooth comb.

 

how about valve seals? they should have checked the head to see if it was sealing. another thing, are you doing your compression test with your throttle wide open?

 

http://www.c-speedracing.com/howto/v...alveadjust.php

read that ^^

the way i did it was bent feller gauges on an angle so i could stick them between the valve and the bottom of the rocker that has te adjuster on it. then use a deep socket and hold it with vise grips and break it loose/ adjust it with a screwdriver

 

that's an awesome write up

 

i think you toasted a motor

 

never had the head checked. but i will get on the valve adjustment today.

 

well if ur valves aren't sealing then you're losing compressing through them. esp if u have new rings.

 

i didnt know its almost as easy to do valve adjustment on a dohc as a sohc just need to bend up a 10mm wrench. could i see smoke out the exhaust if the valves are out of adjustment?

 

ok took a break from the car but now im back in the garage. i did a valve adjustment and a leak down test. after the valve adjustment i redid the compression test and this is what i came up with.

#1=120
#2=160
#3=160
#4=150
i should still be higher than that right

 

worn cylinders, the hone probably took off too much. or your ring gaps are way off

 

or at least much closer together for those numbers.

 

here's my leak down test. i bought a tester from harbor freight and hope its good enought to get the job done.

http://www.youtube.com/watch?v=NCrk1Ngfi54

 

ya im glad that there closer together but i want they higher up. should i try to redue the valves again sience that made so much of a diffrence. i did 6 intake and 7 exhaust (itr cams)

 

did you copper spray the HG?
Copper spraying an MLS gasket is the wrong thing to do. It keeps the nitrile coating from sealing the motor

 

I copper sprayed the hell out of that thing. I'm one of thoes people that beloved in copper spray.

 

its not good on mls gaskets.. That black stuff on both sides is a rubber coating that helps the gasket seal, spraying that copper spray **** on it isnt a good thing

 

I searched forms and read that there is mixed opinions about using it and no real data to take sides. So I used it. Next time I might just not use anything.

 

i wounder if 006 intake and 007exhaust is too tight for valve lash. im going to try to search specs. and maybe redue it.