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Registered
Join Date: Apr 2000
Location: wenham, ma
Posts: 169
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Smoke in cabin
During the first two miles of driving I get a cabin full of smoke.
It smells totaly oil related. It clears right out by the fourth or fifth mile. It is a 73 coupe. Does anyone know what this might be? Cough-cough. |
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09-02-2002, 02:10 PM
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Join Date: Sep 2000
Location: Shreveport, La.
Posts: 1,710
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Well lubricated heat exchangers.
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Robert Stoll 83 911 SC 83 944 |
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09-02-2002, 02:12 PM
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Join Date: Apr 2001
Location: Linn County, Oregon
Posts: 48,789
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Okay, I'll state the obvious...an oil leak dripping on your heat exchangers. "Usual suspects" are return tubes and valve covers...the list goes down from there.
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09-02-2002, 02:13 PM
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Registered Loser
Join Date: May 2001
Location: Worcester, MA
Posts: 2,392
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I had a very similar problem in my 911SC. But the blue smoke wasn't polite enough to stop after a few minutes. So I discussed it with Mark Cummings at AutoSport in Stowe, MA and he said some of his customers had found relief using "drip shields" to keep oil off the heat exchangers. He said the exchangers were crimped rather than welded, so there was no way to keep oil from getting in...unless you kept it off in the first place. True, the best answer is to fix all of your oil leaks...but if your car is a restoration project like mine, then this will require a rebuild. In any event, Mark was kind enough to give me an old heat exchanger as a model so I could fabricate a drip shield of my own. And so far, it has worked much better than I ever expected. It stands as one of my very rare DIY success stories. I went from a choking blue haze to clean, fresh air. Big, dramatic difference.
Soooo...if you are interested, I can email you some pics of my template and of the installed drip shields on the car. But I suspect your "early" heat exchangers will be different from my SC versions. I made two drip shields so I experimented and used different materials. The passenger side shield is just aluminum sheeting bought at AutoZone for $5 while the driver side is a special heat-shielding fabric bought at Summit for $80. Both seem to work equally well. Also, since you live in Mass and I live in Worcester, you are welcome to come and see the drip shields in person if that would help. Okay, if there is anything else I can do to help, let me know. I have a lot of empathy for your problem...
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Owner of a wrecked 944 |
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09-02-2002, 05:20 PM
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Join Date: Jul 2002
Location: Washington D.C
Posts: 36
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Janus,
do you still have the schematics for the oil drip shield?. I have the same smoke problem with my C2 and am interested in fabricating one for my heat exchangers. Thanks for your help. Andy |
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09-30-2002, 05:47 PM
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Registered Loser
Join Date: May 2001
Location: Worcester, MA
Posts: 2,392
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Well, I've been trying to get a good picture using my crappy digicam...so far, the best pics can be found on this Pelican Parts thread...
http://forums.pelicanparts.com/showthread.php?threadid=70868&perpage=20&pagenumber=3 I've got measurements as well and I'll post them when I get home from work. I'll also keep trying to get a good pic. But in any event, the pics in the above thread probably tell the whole story. Schematics with measurements (while personally satisfying  ) are probably major overkill for this mod...But if there is anything I forgot or explained poorly, please let me know...
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Owner of a wrecked 944 Last edited by Wrecked944; 10-01-2002 at 03:22 PM.. |
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10-01-2002, 03:20 PM
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Join Date: Jul 2002
Location: Washington D.C
Posts: 36
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Janus,
How do you attatch the shields to the heat exchanger?. Thanks. Andy |
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10-02-2002, 12:11 PM
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Registered Loser
Join Date: May 2001
Location: Worcester, MA
Posts: 2,392
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"How do you attatch the shields to the heat exchanger?"
Gravity...really. They just sit on top of the heat exchangers. I bent the aluminum shield so it would sort of wrap around the heat exchanger and allow oil to run off the sides. The expensive heat resistant fabric shield is just draped over the heat exchanger. And I (sort of) sealed the slits on both shields using high temp tape. The slits are there just for installation. If you do this mod with the engine out of the car, then you probably would not need to use the slits at all. Oddly, I didn't have to do any major sealing around the three exhaust pipes. I expected oil to drip down the pipes and onto the heat exhangers. And so I expected I'd have to find a solution to that problem. But in my case, the shields worked without additional mods. Of course, as always, your mileage may vary depending on how/where your engine is leaking.
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Owner of a wrecked 944 |
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10-03-2002, 07:22 AM
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Join Date: Jul 2002
Location: Washington D.C
Posts: 36
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Janus,
Does the shields rattles at all at high speed?. Thanks. Andrew |
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10-07-2002, 09:29 AM
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Registered Loser
Join Date: May 2001
Location: Worcester, MA
Posts: 2,392
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"Does the shields rattles at all at high speed?"
Not that I've noticed. It is a pretty tight fit in there and even if it does have some room to rattle, the engine more than drowns it out...I've often wondered if airflow might push the thing out of place...but so far after a year both shields have stayed put...
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Owner of a wrecked 944 |
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10-08-2002, 06:22 AM
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