Dumb question
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Road Captain
Joined: Jan 2008
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Dumb question
I recently put a set of hooker rebel long pipes on my 07 deluxe. Where the top pipe (rear cylinder)passes the tranny cover I have only got about 1/4-3/8 clearance. Im concerned about the heat from the pipe possibly discoloring the tranny cover or even possibly damaging the tranny itself(seals or something). how much clearance do you guys have between your pipes and tranny covers?
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Joined: Sep 2006
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From: Rochester, NY
Contrary to your opinion, that's not a dumb question.
If the pipes have a heat shield over them that doesn't change color, at least its not supposed to, and they are about the same 1/4" away. Its highly unlikely that it could ever transfer enough radient heat energy across a 1/4" air gap (that has a mini huricane going through when your moving) to warm up the tranny cover more than the engine's crank case that its physically bolted to.
In the bad old days, before modern synthetic oils were developed, whenever we suspected that kind of thing might be happening. Cheap or home made tight fitting drag pipes, no heat shields, were notorious for heating things up like that. We used to fabricate an aluminum sheet metal plate and mount it between the pipes and whatever needed protection. With a thin sheet metal plate installed it only needed about 3/16" of an air gap to virtually eliminate any heat transfer. So your 1/4" even without a heat shield covereing the pipe should be more than enough to do the job.
I would however recomend that you change the tranny oil, if you haven't already done it, to one of the better grade synthetic gear oils. They can handle far more heat better than even the best of dyno oils and as an added benifit help the tranny last longer, operate smoother/qiueter, and shift easier.
If the pipes have a heat shield over them that doesn't change color, at least its not supposed to, and they are about the same 1/4" away. Its highly unlikely that it could ever transfer enough radient heat energy across a 1/4" air gap (that has a mini huricane going through when your moving) to warm up the tranny cover more than the engine's crank case that its physically bolted to.
In the bad old days, before modern synthetic oils were developed, whenever we suspected that kind of thing might be happening. Cheap or home made tight fitting drag pipes, no heat shields, were notorious for heating things up like that. We used to fabricate an aluminum sheet metal plate and mount it between the pipes and whatever needed protection. With a thin sheet metal plate installed it only needed about 3/16" of an air gap to virtually eliminate any heat transfer. So your 1/4" even without a heat shield covereing the pipe should be more than enough to do the job.
I would however recomend that you change the tranny oil, if you haven't already done it, to one of the better grade synthetic gear oils. They can handle far more heat better than even the best of dyno oils and as an added benifit help the tranny last longer, operate smoother/qiueter, and shift easier.
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