Posted by simon on September 25, 1998 at 06:55:04:
In Reply to: Re: White smoke. posted by Anatoly Z. on September 24, 1998 at 15:48:19:
I lived in W. Scotland for a few years, where condensation is a fact of life. There were two clear schools of thought, those who drilled drain holes in their steel exhaust systems and those that thought it a waste of time. My experience is that unless you can ensure that the hole(s) you drill will not become a focus for rust itself, don't bother. You are merely adding another possible point for corrosion to set in. Also, if your car is a daily driver, then the condensation is not sitting around for long enough to do much real damage. If you insist on drilling, select the low points in the silencers and drill small holes (max 1/8"; 3mm) at the end closest to the rear of the vehicle. Do not drill the pipes or go near the catalytic converter!!
If I was you, I'd consider going to a cat back stainless system when your existing system needs replacement. Good luck.
: Hey Jeff,
: Thank you very much for your message.
: I've heard that people drill something in the exhaust system but I'm not sure what and where I should drill. If you have some info regarding this question PLEASE LET ME KNOW ABOUT IT.
: Thanks a lot
: PS: Yes, my car equipped with the catalytic converter
: Best regards
: Anatoly Z.
: '90 BMW 535I 80K mi.
: BMW page http://www.dido.com/users/azaytsev/BMW.htm
: : I think the fact that it only occurs when the temp is low is indicative of condensation in the exhaust. As your car cools the water vapor in the exhaust and it condenses back to water. This water sits in your exhaust until you start the car again. AS the water heats it turns to steam and appears as white smoke. THis is not damaging to your engine but may lead to premature failure of your exhaust or catalytic converter (if so equipped). Some people have tried drilling holes in the pipes to allow a drainage path for hte condensation.
: : This is one theory
: : jeff c