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post #1 of 10 (permalink) Old 05-12-2010, 08:39 AM Thread Starter
 
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Building my own Exhaust

Ok I need some of you pro engine guys to tell me why the exhaust pipes have the swiping radius instead of just straight pipe. I want to build my own exhaust but canít understand why this is done. An engine is no more than an air pump so the more air you can get through the engine the better. Now with that said back pressure will give you more bottom end torque but I donít see that overcoming the horsepower gains from flowing more air. I have purchased the big-gun fuel programmer so I will be able to add more fuel to keep the mixture in check so any advice would be welcomed. I will build my own headers and run true dual exhaust with two supertraps.
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post #2 of 10 (permalink) Old 05-12-2010, 04:22 PM
 
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Re: Building my own Exhaust

good question...... maybe someone else knows...
is there enough space to run two straight supertraps?
keep us posted...
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post #3 of 10 (permalink) Old 05-12-2010, 04:31 PM
 
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Re: Building my own Exhaust

I am by no means a 4-stroke guru, I have read on skidoo forums on 4-stroke exhausts, that the curves dont matter,but maintaining the designed length of the original pipe is important. Have seen this advice written for 4-stroke conversions into offroad buggies as well.
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post #4 of 10 (permalink) Old 05-12-2010, 06:30 PM
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Re: Building my own Exhaust

I did a lot of research on Header and exhaust design.
Here's the short, of what I found. Don't fall asleep, there's a test on this latter!

Your right in saying, an internal combustion, is like a pump.
The burning of fuel, heats and expands air, forcing a piston down. When the exhaust valve opens, hot gasses escape. The exhaust rushes down a pipe and out. So why an exhaust pipe at all? If it's a pump, wouldn't an open exhaust, have the least restriction and proved the most power? How can a pipe, with no moving parts, help make more, or less power?

As you guessed, there's a lot more going on, than meets the eye, or in this case, ears.

Lets slow things down, to one step at a time.
As the exhaust valve opens and pressure is released, a Shock wave is formed. This wave moves down the pipe, at the speed of sound and out. We hear it, as a "POP". It's what happens behind this wave, that helps make power. There is a small vacuum.
What if we could make this vacuum bigger? This would pull, more exhaust out and the engine wouldn't have to "Pump" or push it out. The end effect would be more power.

As the shock wave, travels out the pipe and into the open air, or muffler, some of the wave, bounces back. This travels all the way back to the valve and bounces off the back of the valve. If the valve opens, at that same moment, the two shock waves join and a larger wave is created. It has a larger vacuum, behind it.
All of this, takes a small amount of time. We can adjust when this happens, by changing the length of the pipe.

Now the pipe length comes into play.

A short pipe, the wave joining happens quicker or at a high RPM

A long pipe this happens slower, or a low RPM.

As far as back pressure, you don't wan't any. The least amount of restriction, the better.
A muffler adsorbs, or it can break up the shock wave. Small shock wave = small sound. As long as it can flow large volumes of hot exhaust.

A Big Gun muffler is an adsorption type. Remember the packing? That's what its for, adsorbing shock waves.
A Gibson is designed to break the shock wave up or cancel it. That's what the baffles do.

There's a bunch of math that go's along with all of this, but I won't bore you with it.

Now, about that test ....



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post #5 of 10 (permalink) Old 05-12-2010, 07:01 PM
 
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Re: Building my own Exhaust

what about a supertrap exhaust? is it the rings?
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post #6 of 10 (permalink) Old 05-12-2010, 07:46 PM
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Re: Building my own Exhaust

Yes, and I think there is some packing too.



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post #7 of 10 (permalink) Old 05-12-2010, 08:08 PM
 
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Re: Building my own Exhaust

under mod.

Last edited by offroadpro4; 05-13-2010 at 01:39 AM. Reason: under moderation
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post #8 of 10 (permalink) Old 05-12-2010, 11:31 PM
 
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Re: Building my own Exhaust

I would use something else besides a Super Trap. They create way too much back pressure, they are loud as hell, and everything I have seen built with a Super Trap gets changed to a different muffler. Just my 2 cents.
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post #9 of 10 (permalink) Old 05-12-2010, 11:52 PM
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Re: Building my own Exhaust

Quote:
Originally Posted by offroadpro4 View Post
under mod.

Hey Jose aren't you sponsored by Big Gun?

Problems? Questions? Need parts or Repairs? Send us an e-mail, PM, or Call (435) 705-9846

E-mail: [email protected]

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Last edited by offroadpro4; 05-13-2010 at 01:39 AM. Reason: under moderation
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post #10 of 10 (permalink) Old 05-13-2010, 01:15 AM
 
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Re: Building my own Exhaust

Quote:
Originally Posted by Red Rock Rails View Post
Hey Jose aren't you sponsored by Big Gun?

Yup, I have a "level D support" from Big Gun for which I'm proud of running on my revolt.

Big Gun Exhaust is an outstanding product, that really stands out. I believe it was one of the key factors that helped me stand out the pack from other revolts with other products at the last Glen Helen Race, helping me in taking a first place home..

Just trying to gain some knowledge on exhaust inner compositions & back pressure.

Last edited by offroadpro4; 05-13-2010 at 01:41 AM.
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