compresion fail...
#1
compresion fail...
finally getting around to getting my car running again after a year and a half. when i left it, it was smoking pretty badly when running at almost all times. oil smoke.
turbo DEFINITELY needed a rebuild as the shaft play was bad enough to have the compressor housing have some light scoring from the wheel, so that's been sent out, but i was hoping the motor itself was ok. finally gt around to doing a compresion check today. i was happy until i hit cylinder 4...
as you can see form my sig, it's a 1.6 greddy based setup with a begi DP and MSI. ran great at 14 - 15 psi, but the urge to crank it up a bit, (to 17'ish, maybe a little more) may have been thr straw that broke the camel's back...
could be valve related, or ring related, i suppose... might as well pull the head next time i can work on it and see what's up.
FML.
turbo DEFINITELY needed a rebuild as the shaft play was bad enough to have the compressor housing have some light scoring from the wheel, so that's been sent out, but i was hoping the motor itself was ok. finally gt around to doing a compresion check today. i was happy until i hit cylinder 4...
as you can see form my sig, it's a 1.6 greddy based setup with a begi DP and MSI. ran great at 14 - 15 psi, but the urge to crank it up a bit, (to 17'ish, maybe a little more) may have been thr straw that broke the camel's back...
could be valve related, or ring related, i suppose... might as well pull the head next time i can work on it and see what's up.
FML.
#9
looks like the plan is to pull the head and hand it over to my fiance's dad so he can bring it to a machine shop he works with (he owns a used import dealership) to check out. if there's anything off-looking, they'll refresh it with oem-spec stuff and i can slap it back on with some arp studs and check the comp again (assuming the cylinder bores look ok when i pull it). if it still doesn't show decent comp, then i'll build the bottom end with some m-tuned or belfab rods.
my guess is the more likely culprit is the valve guides/seals, since all my plug wells had oil in them that looked like it had been forced through the o-rings on the valve cover side, and adding a tbsp or so of oil to cyl 4 yielded a 120 rather than the 90 i got when i tested it dry.
thoughts on this plan?
my guess is the more likely culprit is the valve guides/seals, since all my plug wells had oil in them that looked like it had been forced through the o-rings on the valve cover side, and adding a tbsp or so of oil to cyl 4 yielded a 120 rather than the 90 i got when i tested it dry.
thoughts on this plan?
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