Smoke coming from Catch can (video), low compression
#1
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Smoke coming from Catch can (video), low compression
The motor has about 170k miles and low compression across the board. Bought the car this way and is running a ebay setup at 8 psi.
dry: 90, 115, 70, 115
wet: slightly higher but not a huge difference
The motor was blowing air out of te dip stick and often knocked it lose out of the slot. Also oil was found in the intercooler pipping. I added a catch can to help relieve the positive pressure in the head. I set it up using the two valve cover ventilation ports and capped off the MAF and intake manifold ports (like pictured in the video).
After taking it for a test drive there is constant stream of smoke coming out of the catch can vent and exhaust.
VIDEO: (click to view)
option 1:
Is there any chance I have a blown head gasket and am burning coolant which would also contribute to the low compression
option 2:
or is there a problem with my piston rings and I am getting excessive blow by and burning oil (need a new motor)
option 3:
other???
any input would be greatly appreciated. Thanks!
dry: 90, 115, 70, 115
wet: slightly higher but not a huge difference
The motor was blowing air out of te dip stick and often knocked it lose out of the slot. Also oil was found in the intercooler pipping. I added a catch can to help relieve the positive pressure in the head. I set it up using the two valve cover ventilation ports and capped off the MAF and intake manifold ports (like pictured in the video).
After taking it for a test drive there is constant stream of smoke coming out of the catch can vent and exhaust.
VIDEO: (click to view)
option 1:
Is there any chance I have a blown head gasket and am burning coolant which would also contribute to the low compression
option 2:
or is there a problem with my piston rings and I am getting excessive blow by and burning oil (need a new motor)
option 3:
other???
any input would be greatly appreciated. Thanks!
#3
glad to hear im not the only one dealing with this problem lol! I ran the vent tube out of my wheel well so i dont have to see smoke coming out of my hood.. ive only got low comp on cyl#1 its at 120.. but i think i also have an external headgasket oil leak... Sucks cus i just did a headgasket but didnt resurface the head like a dumbass... But i cant seem to pinpoint the leak after regasketing everything twice.... oh well pickin up a new motor this week.
#4
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Ya, i figured. Just wanted to double check before pulling the motor. Thanks for the help!
Try a leak down test. It would be very helpful to pinpoint the problem since only one cylinder is bad. My entire engine is messed up and all cylinders are crap so i guess theres not use in that for me...
I have a spare engine in my garage that I am doing maintenance work on before I drop it in. Hopefully that will solve all my problems.
glad to hear im not the only one dealing with this problem lol! I ran the vent tube out of my wheel well so i dont have to see smoke coming out of my hood.. ive only got low comp on cyl#1 its at 120.. but i think i also have an external headgasket oil leak... Sucks cus i just did a headgasket but didnt resurface the head like a dumbass... But i cant seem to pinpoint the leak after regasketing everything twice.... oh well pickin up a new motor this week.
I have a spare engine in my garage that I am doing maintenance work on before I drop it in. Hopefully that will solve all my problems.
#7
those compression numbers are pretty terrible, and cyl 3 is especially bad. sav's response is most appropriate. at this point, it doesn't really matter whether it's rings or HG (smoke looks fairly white for it to be JUST oil), that motor needs to be replaced/refreshed. not a ton of value in diagnosing it further, i don't think.
#9
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those compression numbers are pretty terrible, and cyl 3 is especially bad. sav's response is most appropriate. at this point, it doesn't really matter whether it's rings or HG (smoke looks fairly white for it to be JUST oil), that motor needs to be replaced/refreshed. not a ton of value in diagnosing it further, i don't think.
I'm just gonna run 8psi for a while so I'm hoping a stock block will hold up fine for a while. Ill definitely keep it in my garage for a while if I want to up the boost and do a serious build. Thanks.
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