Big Blue Puff Of Smoke..

[Paul SM]

<_< A few weeks ago at Wakefield, coming out of turn 1, my R33 GTSt produced a massive puff of blue smoke as if some serious problem had occured. Engine was momentarily fluffy so I pulled into the pits. At idle it seemed OK but the air filter box had a big puddle of oil at the bottom. Figured turbo seals had failed so drove gently home and later to Powerplay at Drummoyne.

Could not get the turbo rebuilt - Garrett's said parts were no longer available so, in went a good 2H unit. Air/fuel mixture had been 12:1 at high revs so a GTR fuel pump and regulator went in too. Car now felt seriously strong and boost valve had to be wound back to zero (guage was showing almost 1 bar instead of 0.8 bar previously) - it now gives 0.75 bar at no clicks.

Next time at Wakefield on 4th lap, same spot, same big blue puff of smoke. This time just stomped on it, engine cleared and car ended up doing a couple of mid 11's, so seemed healthy. But there was a catch - at the end of the day the engine was down 2 litres of oil!

Powerplay now does not think it's a turbo problem. Does anyone have any suggestions? The car has done two and a half years of Supersprints but the engine sounds and feels perfect - and does not use oil in normal driving.

[Silver-Arrowz]

Sounds like it's about to let go.

[Sambo33]

get a compression and leak down test done. i had a similar problem, turbo was fine & no oil leaks anywhere. but i was always topping up the oil. turned out the rignglands were shot on all 6 pistons! an engine rebuild is in process at the moment.

not good news, but hope that helps

sam

[Sambo33]

for a bit more detail, heres a thread i posted awhile back.

http://www.skylinesaustralia.com/forums/in...1&st=&p=entry

[Busky2k]

Could be also that you're getting excessive blowby and the oil/air mixture is being pushed into the turbo via the crankcase ventilation. (Evident by oil in the air box). I highly recommend you invest in catch can kit(s) if you are doing track work.

[BOZ22N]

have you pulled of your intake tube that connect to your throttle body?

check that for a oiliy residue. if so then check if your PCV (positive crank ventalation) hose that connects to your intake also has the same residue in it. if so then check your static compression.

you said that you checked your fuel air ratio? i have had one case where a dribbly injector was over fuelling and washing the bore there for burning oil.

Good luck,

Boz