H pipe on dual exhaust.

[philo_beddoe]

I have full duals, should they be connected by that cross pipe or H pipe? If so, what are the benefits?

[Rattler12]

Evens out the pulses down each set of pipes, helps scavenging and doesn't sound like two four cylinder engines running down the road

[rich weyand]

The issue is that V-8s don't fire L-R-L-R-L-R-L-R, they fire L-R-R-L-R-L-L-R.  Those two pulses one right after the other result in cylinders 4 and 7 opening the exhaust valve into a higher pressure in the exhaust than the other cylinders see.  The X-pipe allows the extra pressure to go out the other side, where the H-pipe bleeds it off to the other side.  Almost the same, but people will tell you that X-pipes are better at high rpm for horsepower and H-pipes are better at low rpm for torque.

On a C truck you can do either, while on a K truck the X-pipe can be difficult to fit in there where the H-pipe is no big deal.  The H-pipe is probably better for a truck in any case.  The H-pipe need not be full exhaust diameter.  My exhaust is 2.25" and my H-pipe is 2".  Either goes as far forward as you can get it.

http://users.rcn.com/weyand/smalls/imag0315small.jpg

[philo_beddoe]

Ok, good info. My brother told me it would benefit, i told him i'll check "my sources". Thanks, time to get the welder out.

[Captain Swampy]

Hopefully around Easter we're going to have this muffler in Brooke's truck. It has the X in the muffler.

[philo_beddoe]

Any pics of an H pipe application?

[Rattler12]

As for placement of the H pipe I heard somewhere that you should spray some rattle can paint down the side of the exhaust pipe, run the engine to temp and where it the paint stopped burning off is where to put the pipe.....?/

[Captain Swampy]

http://www.fordmuscleforums.com/attachments/all-ford-techboard/10575d1259099007-h-pipe-x-pipe-pc120046.jpg
http://users.rcn.com/weyand/smalls/imag0315small.jpg

[philo_beddoe]

http://www.fordmuscleforums.com/attachments/all-ford-techboard/10575d1259099007-h-pipe-x-pipe-pc120046.jpg
http://users.rcn.com/weyand/smalls/imag0315small.jpg

So it goes AFTER the exhaust??

[SomeTexan]

http://www.fordmuscleforums.com/attachments/all-ford-techboard/10575d1259099007-h-pipe-x-pipe-pc120046.jpg
http://users.rcn.com/weyand/smalls/imag0315small.jpg

So it goes AFTER the exhaust??

I've always heard you put them as close to the engine as you can. After the headers/manifolds, before the mufflers.

[1967KaiserM715]

Correct, closer to engine is better, some guys can fit it before tranny oil pan and the bellhousing-but that does make it hard for some to do tranny fluid changes


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[philo_beddoe]

Ok, thats what i thought. Thanks

[Rattler12]

Correct, closer to engine is better, some guys can fit it before tranny oil pan and the bellhousing-but that does make it hard for some to do tranny fluid changes


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Made mine removable just for that reason..... easy trans removal if needed

[80Chevy4x4]

 

Correct, closer to engine is better, some guys can fit it before tranny oil pan and the bellhousing-but that does make it hard for some to do tranny fluid changes


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Made mine removable just for that reason..... easy trans removal if needed

Do you have a picture on how you did it by chance?

[philo_beddoe]

I'd like to see a pic too...