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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
Originally Posted by RarlyL8 View Post
E85? ... Exhaust cooling is not such an issue once the exhaust leaves the turbo...
Yes, probably not an issue for this application.

However, in principle cooling at the exhaust slows down flow and adds to back pressure. Builders often go to the effort to minimize this like using coatings, going to a shorter exhaust pipe (like side exits), and or use different diameter pipe along the run (i.e. stepped headers).

One of the attributes of aluminum is it dissipates heat faster than steel. Its light weight is a definite advantage. I am just guessing that the reason it is not used in exhausts is mostly the temp issue but the second reason might be the cooling issue.

Brian, how about a right side exit titanium muffler system for the 930? Could be a must have to go with your wonderful headers.

Still, this alloy system is a very fun project.
Old 04-01-2010, 04:20 PM
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