Crossover Exhasut pipes

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65shad had mentioned in the other post that he had heard the crossover should be farther back. My '61 Vette has a crossover that basically tees off the head pipes very close to the engine. Many of the Harley Davidson Motorcycles have one that tees off the head pipes right under the air cleaner. I thought I had heard that the crossover worked better closer to the engine. IIRC my 65 Lincoln has the dual pipes connected at the first set of mufflers.

I am curious if anyone knows the pros/cons of placing the crossover closer to engines or closer to mufflers or even after the mufflers. Seems I have seen some vehicles equipped that way.
Thanks,
Doug
 
Seems like on a V-8 or Harley it would balance out the odd exhaust pulses better if it was closer to the manifolds. With an I6 it would probably just change the sound a little.
 
The argument for and against a far back x-pipe is like if equal length headers beat interference headers. In practice, you just use what packages well, and don't beat yourself up if the pipe is to far back, ot too far forward.


Technically, for street cars, the closer the x-pipe is to the engine, the better.

The reason that most NASCAR and wild V-8's run X-pipes further back is that its gives better power and mid range torque and sound when compared to trying to mandrel bend 2.5 to 3" pipe past a Doug Nash 4 -speed or a big auto.

Seattle Smitty sent me some articles from Car Craft, and on modern street engines, the closer to the end of the header collecters, the better.

On modern cars with cat converters, there is a gain to having the x-ipe before the cats, but there are then issues with packaging.

So fit it in a way you are happy, and run it. :wink:
 
On an I6 it does not make enough difference to worry -just put it where ever is easiest as the engine is balanced, the scavanging effect is pretty much cancelled out by the increased turbulance so all you are getting is a different exhaust note. I have dual exhaust and wouldn't think about a crossover-- but i don't have any drone and with the lumpy cam it just sounds too good to mess with.
 
I put my "h-pipe" behind the muffler, only because it is a single-in and dual-out type. It is only for sound mixing on these inline sixes, does nothing for the engine.

Kirk
 
For an H-pipe ( I don't know if it applies to a X-pipe ),

I read where you take a crayon and draw a thick line down your pipes and where it melted and burnt off that's where you want to install your H pipe. I also read to use a tape on thermometer and the hottest spot on the pipes is the best place. So where the most heat collects is the place to install the H pipe. Where ever it fits is the best place to install the cross over regardless of heat, but I like the crayon idea if you have room to spare. No dyno test, but decible levels were reduced and a better sounding exhaust note was the results. One of those articles I read, it recommended a 2 1/4" H pipe into 2 1/2" exhaust; however, both those articles were written for a V8. Our engines are balanced, so I'm curious to find out if there is any gain besides sound.
 
jahearne":w0cykfcl said:
For an H-pipe ( I don't know if it applies to a X-pipe ),

I read where you take a crayon and draw a thick line down your pipes and where it melted and burnt off that's where you want to install your H pipe. I also read to use a tape on thermometer and the hottest spot on the pipes is the best place. So where the most heat collects is the place to install the H pipe. Where ever it fits is the best place to install the cross over regardless of heat, but I like the crayon idea if you have room to spare. No dyno test, but decible levels were reduced and a better sounding exhaust note was the results. One of those articles I read, it recommended a 2 1/4" H pipe into 2 1/2" exhaust; however, both those articles were written for a V8. Our engines are balanced, so I'm curious to find out if there is any gain besides sound.
Click to expand...

I just did it for the sound. And the only place I could put it was behind the muffler. My hottest spot is just behind the turbine at the downpipe, I would think, but it is a single 2 1/2". Anyways, I had nothing better to do that day.

Kirk
 
I wouldn't think that it would make any difference at all in a situation like that, it's already balanced in the single pipe.
 
wallaka":c69eqh7i said:
I wouldn't think that it would make any difference at all in a situation like that, it's already balanced in the single pipe.
Click to expand...

Oh, I was just farting around that day and seeing, what if? It does give you something to talk about, though. But the exhaust note is different with/without the "h-pipe" on this particular application. If I had a way of proving it with sound I would, but you would have to come down to Texas for that...no video camera here. Have a good one.

Kirk
 
Oh, I believe you, it just seems strange. Tell you what, I'll come to Texas if you pay my ticket from Frankfurt (not Kentucky either :? ).
 
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