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Join Date: Aug 2006
Posts: 5
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Smokey 930
Hi Guys!
Hope you guys can give me some idea! Smokes on idle when warm, temp guage half way!(blue smoke) Push the throttle to 2.5k rpm and it will run with no smoke at all! Let the revs die, and blip the throttle, it will puff on the blip! if that makes sense? Had the turbo rebuilt last month, as i thought it was turbo seals, so it cant be the turbo. If it were rings it would smoke under load! Also had a leak test done, march last year and all 6 cylinders are within 5% of what they should be! My specialist wants to pull the heads off, to find out whats going on! But what if it's not worn guides, would be a total waste of money taking the heads off! The car is a 1987 4 speed U.S car from CA! Has had smog unit, air con, and CAT removed! Done just over 52k miles. Any help would be fantastic, Cheers, Si |
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Join Date: Jun 2001
Location: Sweden
Posts: 5,911
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Worn valve guides or bad turbo. How did they "rebuild" the turbo? Once shaft gets scored, it's hard to seal it again so just swapping bearings won't help.
You can take off the valve covers and wiggle valves in their stems to check for play.
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Thank you for your time, |
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Turbo Technics rebuilt the turbo!
It had new seals and bearings, they said it wasnt that badly worn anyway! They said it was all pressure tested and then their VSR core balancing machine tested it to 250,000 rpm. So the turbo is fine, this leaves me with valve guides or piston rings ![]() |
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Join Date: Jun 2001
Location: Sweden
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I don't think it's rings. If rings were worn you would expirience very high oil consumption, bad leakdown #'s and excessive blow-by.
Probably valve guides. Not so expennsive to fix. While there, check compression rings for cracks. They are often in pieces.
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Thank you for your time, |
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Is it worth replacing the rings while heads are off?
And is there anything else worth doing? Thanks for the reply buddy! |
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Join Date: Dec 2004
Location: Danville - CA
Posts: 1,259
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Not to jack the thread but I have a somewhat similar question. My 930 doesn't smoke at any time except for a slight puff out of the wastegate exhaust tip under heavy throttle at upshifts. Also often lets out a little flame from there as well.
Something to be concerned with?
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Rob Montgomery '88 Blk/Blk 930 ('Lucy') - Not Stock & Not Running |
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Join Date: Aug 2006
Posts: 5
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I wouldnt be too worried about that mate! Maybe overfueling????
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I heard about an issue with smoking 930's using Mahle oil filters. Anyone else heard about this?
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2014 Cayman S (track rat w/GT4 suspension) 1979 930 (475 rwhp at 0.95 bar) |
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Join Date: Jun 2004
Location: Siesta Key, Florida
Posts: 1,240
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David,
I believe that pertains to 993 turbos. Much information on the Rennlist. JP
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JP 86 930/4 tribute beasty 81 sc beach beater ‘55 Belair ‘40 Ford pickup |
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Join Date: May 2005
Location: Loxahatchee, florida
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ok the flames thing thats not something to be concerned with it's something to be proud of. as for the smoke how much oil do you put in when you change it ? if it's to the top line then it's too much and you probably have oil all over the inside of your intercooler and evry where else.
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88 turbo Guards red Targa slant nose, and yes I am a horsepower junkie, 3.4liter,7.5 to 1 JE pistons, Adjustable WUR, Imagine fuel head, 1 bar waste gate headers,allthe cis toys. Now apart to become the next EFI monster. fabbing my own intake, headers Individual throttle bodies, MS-3, pauter rods, Xtreme twin plugged heads, gt-2 evo cams cop's. 2019 Silverado 6.2L |
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Ive heard of scavenge pumps failing, and causing smoke on idle! Is this true?
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Quote:
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2014 Cayman S (track rat w/GT4 suspension) 1979 930 (475 rwhp at 0.95 bar) |
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