b20 vtec turbo compression problems
#1
Honda-Tech Member
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b20 vtec turbo compression problems
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.
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.
#4
Honda-Tech Member
Thread Starter
Re: b20 vtec turbo compression problems
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.
#5
Re: b20 vtec turbo compression problems
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?
#6
Re: b20 vtec turbo compression problems
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
#7
Re: b20 vtec turbo compression problems
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
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
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#10
#11
Honda-Tech Member
Thread Starter
Re: b20 vtec turbo compression problems
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?
#12
Honda-Tech Member
Thread Starter
Re: b20 vtec turbo compression problems
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
#1=120
#2=160
#3=160
#4=150
i should still be higher than that right
#15
Honda-Tech Member
Thread Starter
Re: b20 vtec turbo compression problems
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
http://www.youtube.com/watch?v=NCrk1Ngfi54
#16
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Re: b20 vtec turbo compression problems
#17
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Re: b20 vtec turbo compression problems
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
Copper spraying an MLS gasket is the wrong thing to do. It keeps the nitrile coating from sealing the motor
#18
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Re: b20 vtec turbo compression problems
#19
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Re: b20 vtec turbo compression problems
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
#20
Honda-Tech Member
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Re: b20 vtec turbo compression problems
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.
#21
Honda-Tech Member
Thread Starter
Re: b20 vtec turbo compression problems
i wounder if 006 intake and 007exhaust is too tight for valve lash. im going to try to search specs. and maybe redue it.
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