Mazda Rotary Club

General => General Technical => Anything Engine/Performance/Tuning related => Topic started by: L18M on November 03, 2011, 04:49:21 PM

Title: what can cause (oily) smokey exhaust?
Post by: L18M on November 03, 2011, 04:49:21 PM
luck with the fc doesnt seem to be getting any better..

ok, what would cause oily smoke to pour out the exhaust?
i had a word with tim (rxmotors) and he said would be from either engine or back of tub.
another person said maybe oil in the exhaust.
Any other possibilities? really hoping its not oil control ring in engine.

was advised to take plugs out and see if they are oily. if not then chances are its the back of the turbo causing it. (will be checked tmr, im not with car so can not check now)

Background of "new setup":
used engine installed, apparently was running well before engine taken out.
Engine transported (with oil still in it) and got knocked about a bit. oil press sensor got cracked, and replaced with the old one from my original engine and also lim was cracked. (engine wasnt tied down to pallet for transport).

enigne installed and started, was a bit smokey. went for a drive and smoke cleared up. parked up car for couple hours then went to move it and loads of smoke kept pouring out the exhaust. oily blue ish smoke.

thanks for any input :Thumbsup!
i think if its engine, chances are i cant be bothered with it no more and prob break... *waiting to watch the vultures swoop in*
Title: what can cause (oily) smokey exhaust?
Post by: lee mills on November 03, 2011, 05:49:37 PM
sounds like turbo seals. same happened to my rf420s.
Title: what can cause (oily) smokey exhaust?
Post by: Prof on November 03, 2011, 06:03:06 PM
+1 on turbo seals - Pete Taylor had the same issue on his turbo.
 
One thing to check is the oil drain from the turbo - if this get\'s blocked or doesn\'t run \'down hill\' from turbo to the front cover, then you can get excessive smoking from the turbo - but seals is the most probable.
 
A freshly rebuilt engine will smoke a lot, or one that someone has put oil in through the plug holes to store for a while - might be worth giving it a run and seeing if the smoke lessens.
Title: what can cause (oily) smokey exhaust?
Post by: wolfie1 on November 03, 2011, 10:09:14 PM
+1 on profs answer, i have rebuilt and transported a lot of engines (ones with oil in them whilst transported), ok none have been rotarys but that shouldnt make much difference and they have all been smokey for a good while after start up, once they get good and hot and have run for a while and have died down with the smoke
Title: what can cause (oily) smokey exhaust?
Post by: Eoiny555 on November 03, 2011, 10:43:03 PM
My fd always smokes on cold startup & spits out some oil but it stops once it warms up, i have noticed lately that the turbo\'s have started to smoke on startup aswell which sounds like turbo seals
Title: what can cause (oily) smokey exhaust?
Post by: L18M on November 04, 2011, 01:20:51 PM
thanks for the replies everyone :god

had the plugs out and seem ok so does point to the turbo.
rebuild turbo i heard was about £350+

or good time to upgrade (not that i ran that turbo for long, not even boosted it :( lol)