Smoke from exhaust with no load
#1
Smoke from exhaust with no load
Fresh rebuilt BP, new pistons, rings, valve seals ect... Car drives good, good power but when coming to a stop or just taking off normally in 1st I get a coulple puffs of greyish smoke from the tail pipe. Enough that it is a bit embarrassing. Strange thing is that it only happens sometimes, maybe 50% of the time. I thought maybe I fucked up rebuilding my turbo so I popped off the 16g and dropped in a known good 14b. Still seems to be doing it. Should be noted that I have both valve cover ports going to a VTA catch can, no pcv system. Any thoughts? I have a fair amount of soot coming outta the pipe on a cold start too. Air/fuels look good. Zero oil in charge pipes.
#3
Pulled the plugs today, all have signs of oil burning and ash deposits. I looked down into the cylinders and can see oil on all the piston tops, they are all wet... Car only smokes after decel, coming off idle and spits black outta the exhaust on start up. No smoke when cruising and only light, black haze when really on it. Ill try to do a leak down in the next few days. I had all the valve seals and a few guides done during the rebuild but i used felpro seals. What are your guys thoughts? Strange its all cylinders and pistons are wet... Leads me to believe it could be the valve seals... How could oil get on top of piston when its not running if it was rings.
#5
Ya the throttle butterfly and intercooler are dry so I know it's not the turbo. My machinist installed the valve seals but would assume he did the right. That said anyone can make a mistake. He is one of my best friends, said if I pop the cams out he would come by and install new valve seals again. I just wanna know what it is before i go that far.
#6
Ya the throttle butterfly and intercooler are dry so I know it's not the turbo. My machinist installed the valve seals but would assume he did the right. That said anyone can make a mistake. He is one of my best friends, said if I pop the cams out he would come by and install new valve seals again. I just wanna know what it is before i go that far.
#13
I suspect either the remaining guides, or the rings never seated. Its possible to get smoke at startup from worn rings, same for off idle and on decel. My last 944 motor did the exact same thing with rings that were toast, and even it didn't burn oil that fast with track use only (the car basically fogged for mosquitoes every time you decel'd from WOT).
#14
I suspect either the remaining guides, or the rings never seated. Its possible to get smoke at startup from worn rings, same for off idle and on decel. My last 944 motor did the exact same thing with rings that were toast, and even it didn't burn oil that fast with track use only (the car basically fogged for mosquitoes every time you decel'd from WOT).
I did a quick compression test this morning, I didn't have my leakdown tester handy. With engine hot: 160, 160, 165, 167.
#16
Ya, I totally agree. I will say, I would find it strange that all the rings would be bad from a reputable company like arias and I'm getting next to nothing in my catch can. That said, it is totally in the realm on possibility. Leak down test can rule out the rings but it won't tell me if its the stem seals, it can tell if valves are sealing in the head but not if the stems are sealing. Car doesn't have the decel haze you are describing from your other car, I have experienced that before and yes it was rings. Right now I'm considering 2 options, 1) Order new valve seals from Mazda for $200 ******* dollars or 2) Find a bp4w head and just try that. I'm still open to suggestions however and obviously I need to do a leak down before I pull the trigger on either option.
#17
At least it will rule out rings. Doesn't necessarily mean defective rings, could have been too much oil on walls during assembly/break in, wrong hone finish, etc. I'd be pretty surprised if you were losing a quart/60 miles from just seals. If you rule out rings, I'd probably sooner just swap heads.
#18
At least it will rule out rings. Doesn't necessarily mean defective rings, could have been too much oil on walls during assembly/break in, wrong hone finish, etc. I'd be pretty surprised if you were losing a quart/60 miles from just seals. If you rule out rings, I'd probably sooner just swap heads.