H-pipe? - Honda Shadow Forums : Shadow Motorcycle Forum
 
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post #1 of 5 (permalink) Old 04-14-2019, 10:49 AM Thread Starter
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H-pipe?

So I’m eliminating the old torn up mufflers from my 85 Shadow 700, I’m rejetting the carbs with a performance rebuild kit online. I’d like to run open pipes, or freeflow mufflers at the least. Someone told me that I may have an issue running two straight pipes if I eliminate the h-pipe that connected the old mufflers. He tells me that it equalizes the pressure in the exhaust. If I retune after the upgrade will I still have to add an h-pipe between my new mufflers to equalize pressure?

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post #2 of 5 (permalink) Old 04-14-2019, 12:18 PM
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Originally Posted by TileNinja View Post
So Im eliminating the old torn up mufflers from my 85 Shadow 700, Im rejetting the carbs with a performance rebuild kit online. Id like to run open pipes, or freeflow mufflers at the least. Someone told me that I may have an issue running two straight pipes if I eliminate the h-pipe that connected the old mufflers. He tells me that it equalizes the pressure in the exhaust. If I retune after the upgrade will I still have to add an h-pipe between my new mufflers to equalize pressure?

As you describe your goals, no, you do not have to add an "H" pipe.

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post #3 of 5 (permalink) Old 04-14-2019, 01:40 PM
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You don't need that H pipe crossover chamber. I have individual pipes and I didn't even re-jet.

But I do believe it contributes to more decel popping, at least on mine. I have richend the pilot jets not long ago to see if it would help, and it still has A LOT of decel pop.
I think the factory chamber has a lot to do with equalizing some of the exhaust gas pulsation and can soften the popping.

I remember back years ago when Dual exhaust was installed on the old V8s, they would weld in a crossover to lower the popping/ backfire. More of a mellow sound.

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post #4 of 5 (permalink) Old 04-14-2019, 01:55 PM
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I'm in agreement with Chuck_Michigan.

An H-pipe in my understanding will reduce some of the bark from the exhaust and if ideally located will actually improve mid-range power a bit.
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post #5 of 5 (permalink) Old 04-14-2019, 03:07 PM Thread Starter
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Excellent! Thank you very much gentlemen, I appreciate you guys taking the time to respond.
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