Smoke on overrun??
08-08-2009, 11:52 AM
#1
Smoke on overrun??
My standard Sapphire Cosworth has got Blue smoke on over run 
It's not all the time just now and again but when it does it, it's quite a bit.
It does not do it on boost or whilst driving normal just when decelerating.
Any ideas anyone, it's fairly low milage (41,000)
Surley can't be rings can it?
It's not all the time just now and again but when it does it, it's quite a bit.
It does not do it on boost or whilst driving normal just when decelerating.
Any ideas anyone, it's fairly low milage (41,000)
Surley can't be rings can it?
08-08-2009, 02:20 PM
#5
turbo.
was no sign of oil in any of the pipes on mine but when i was rebuilding my engine the plenum chamber had a nice coating of oil inside which can have only really come from the turbo.
if you can afford it though buy a new turbo, i bought 2nd hand and it's ended up coasting me the same as a new one by the time i've had to have it rebuilt as it was just as bad as my old one!
was no sign of oil in any of the pipes on mine but when i was rebuilding my engine the plenum chamber had a nice coating of oil inside which can have only really come from the turbo.
if you can afford it though buy a new turbo, i bought 2nd hand and it's ended up coasting me the same as a new one by the time i've had to have it rebuilt as it was just as bad as my old one!
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08-08-2009, 10:27 PM
#8
14000+ post superhero
my brand new t34 still gave a little blue smoke on over run when i had it fitted but it was 100% better than the old one that caused me to be surrounded by my own little blue cloud everytime i stopped for a few minutes at traffic lights. reconditioned turbos also caused me lots of grief until i ended up buying new
Last edited by fuzzy; 08-08-2009 at 10:28 PM.
09-08-2009, 09:32 AM
#9
20K+ Super Poster.
Could be the turbo, could also be the rings, the clue would be in the pipes between turbo and engine.
I would make sure the breather is nice and clear at the same time.
Recon turbo's are ace if done by the right people, if having a rebuild, get a step gap seal mod done, this can save 90% of the oil consumption a turbo sees.
tabetha
I would make sure the breather is nice and clear at the same time.
Recon turbo's are ace if done by the right people, if having a rebuild, get a step gap seal mod done, this can save 90% of the oil consumption a turbo sees.
tabetha
09-08-2009, 05:26 PM
#11
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Turbo as said before but also a possible cause could be worn intake valves seals...
(Tabetha what is a step gap seal mod as I don't understanding it by the title...)
(Tabetha what is a step gap seal mod as I don't understanding it by the title...)
Last edited by ybturbo; 09-08-2009 at 05:29 PM.
09-08-2009, 05:49 PM
#14
20K+ Super Poster.
tabetha
10-08-2009, 12:28 PM
#15
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The normal rings on the end of the shafts are snap rings, so they have a gap as they need to due to them being sprung, this allows oil to leak past, a step gap seal is just that, a small mod that effectively closes the gap by addition of another section to close it off.
tabetha
tabetha
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