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Smoke from left rear wheel

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Old May 10, 2005 | 04:15 PM
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Default Smoke from left rear wheel

Already searched. No answer there.

I have noticed smoke coming from my left rear wheel arch. It smells of rubber, so I have ruled out oil. I believe it comes when I accelerate hard in first and my tires spin, heating the tire to make it smoke. I use P Rosso's (285/30/18)
I have not noticed it if you drive on the highway. Took the wheel off and inspected for any rubbing, and found no evidence. I do notice a smell of hot rubber if the car has been driven hard or idling in traffic for long (oil temp at 40%)
Is my diagnosis correct? Is there something made of rubber that could do this? (I have not inspected the heater ducts)
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Old May 10, 2005 | 04:25 PM
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I would check for any foreign -material- slung onto the muffler. I dont feel that the relatively small wheelspin any 993 can exhibit will be enough for you to smell burning rubber, much less after you have stopped for inspection..
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Old May 10, 2005 | 04:35 PM
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Will do. However, I have seen strips of about 20mt (accelerating off a side street while turning left). Its more of a rash than a streak, were the tire was slipping slightly, rather than uncontrolled off the line drag type spin. My 993 has LSD, too.
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Old May 10, 2005 | 11:19 PM
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I am almost certain that it's a lower valve cover leak. Ask me how I know. People on the strip in Las Vegas looked at the car pretty funny when I was slowly rolling by with smoke coming out of both arches.
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Old May 10, 2005 | 11:35 PM
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Originally Posted by nile13
I am almost certain that it's a lower valve cover leak. Ask me how I know. People on the strip in Las Vegas looked at the car pretty funny when I was slowly rolling by with smoke coming out of both arches.
Yep... Seen that movie too. People thinking to themselves.... "That Porsh is a piece of junk that smokes".
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Old May 10, 2005 | 11:41 PM
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So, this is a narrow body C2 and if this correct I thought the right size tire is 265/30/18s. The odd thing is the smoke is coming from only one side...umh... when I wanted to go with 18s and I have C4 I was told I could not go with 285, as they were just too big for a smaller ***....
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Old May 11, 2005 | 08:59 AM
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Orc - That's a valve cover gasket leak.

HKG36C - You can go up to 305s with the right offset; my cab is running 285s on 11" rims with fenders rolled and there is a wee bit more room for wider tires.
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Old May 11, 2005 | 09:26 AM
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I hear you. Will inspect valve covers. But...
I can recognize the smell of oil smoke...and the one coming from th ewheel arch is clearly rubber. I also thought it was the tire rubbing against something, but could not find any erosion marks on the fender.
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Old May 11, 2005 | 10:56 AM
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Sorry Guys,

Playing with my avatar. Need to make it smaller.
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Old May 11, 2005 | 11:00 AM
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That is a more decent size. Was too big.
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Old May 11, 2005 | 02:25 PM
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Originally Posted by orcfromthesouth
I hear you. Will inspect valve covers. But...
I can recognize the smell of oil smoke...and the one coming from th ewheel arch is clearly rubber. I also thought it was the tire rubbing against something, but could not find any erosion marks on the fender.
There is a difference between the smell of oil that is dripping onto a hot muffler and oil that is seeping past your valves and seals, being burned off in the combusion chamber and then blown out through your mufflers.
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Old May 11, 2005 | 05:47 PM
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Actually, Mobil 1 smells different than mineral oils when it sizles on top of your heat exchangers, whcih I found to be interesting.
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Old May 11, 2005 | 08:24 PM
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Will check. But burnt rubber smalls like burnt rubber. I have a stage 3 Dyna (HD) and I know what Mobil 1 smells over hot exhaust (even though my self hand-assembled twin cam engine uses almost no oil...ejem...)
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Old May 11, 2005 | 10:25 PM
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orc-

i'm with you man. i have the same smell- but it is at it worst when the winter tires and wheels are mounted, oddly (18" sport design w/dunlop ws3). i'd love to figure this one out. it doesn't seem to be affecting performance of the car what-so-ever though.

i have a narrow body c2
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Old May 12, 2005 | 02:39 AM
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Agree with the valve cover leak. It is the most likely...besides is easy enough to check, if you don't have the engine cover on, that is (which you shouldn't).

Edward
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