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Old 05-02-2008, 07:28 PM
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Clearance: driveshaft versus H-pipe

For the guys who have a H-pipe crossover on their dual exhaust - what is a good minimum clearance between the H-pipe and the driveshaft? Thanks.

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Old 05-02-2008, 07:32 PM
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If the pipe is close to the front u-joint and misses, it probably won't be an issue. The further back the pipe is, the more static clearance you'll need due to the up/down movement of the shaft. It all depends on how much bump/rebound you have in the rear suspension.
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Old 05-02-2008, 07:35 PM
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Quote:
Originally Posted by techinspector1
If the pipe is close to the front u-joint and misses, it probably won't be an issue. The further back the pipe is, the more static clearance you'll need due to the up/down movement of the shaft. It all depends on how much bump/rebound you have in the rear suspension.
Stock leaf springs - but the rear shocks are Lakewood 50/50's - on my 1969 Mercury Montego MX.
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Old 05-02-2008, 08:45 PM
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re;clearance;driveshaft versus H-pipe

I would try to give it 1"to 1&1/2" below max travel.
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Old 05-02-2008, 08:47 PM
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Ditto what tech said, move it as far forward as possible. There is no rule or formula, get a bunch of beer drinkin' buddies to jump up and down on the rear bumper the watch underneath maybe?
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Old 05-03-2008, 07:29 PM
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I just finished driving my car with it's new H-pipe dual exhaust. Because of the pre-existing geometry of my dual exhaust in relation to the AOD trans and it's crossmember I had to put my H-pipe so it's maybe nine inches past the collector - so it's underneath about two inches before the front u-joint of the driveshaft. It turns out that I have almost four inches between the driveshaft and the H-pipe. It worked out alot better than I was envisioning. It is a little quieter at idle, seems to bark the tires a bit more with the 1-2 shift and seems to sound a bit more refined compared to how it sounded before when my dual exhaust had no crossover at all!
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Old 05-03-2008, 08:09 PM
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re;clearence;driveshaft versus H-pipe

Quote:
Originally Posted by Sixtyninemercury
I just finished driving my car with it's new H-pipe dual exhaust. Because of the pre-existing geometry of my dual exhaust in relation to the AOD trans and it's crossmember I had to put my H-pipe so it's maybe nine inches past the collector - so it's underneath about two inches before the front u-joint of the driveshaft. It turns out that I have almost four inches between the driveshaft and the H-pipe. It worked out alot better than I was envisioning. It is a little quieter at idle, seems to bark the tires a bit more with the 1-2 shift and seems to sound a bit more refined compared to how it sounded before when my dual exhaust had no crossover at all!
good move,I was thinking the crossover was further to the rear. Tom
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Old 05-03-2008, 08:23 PM
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If the H pipe is welded in, make sure it is BEHIND the trans tail shaft by alteast an inch. Makes pulling the trans a lot easier when it clears the pipe. (don't ask how I know this! LOL)

Mark
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