SuzukiSavage.com - Does a cooler exhaust improve performance?

Charon Serious Thumper Offline Posts: 1811 Harvard, NE Gender:	Re: Does a cooler exhaust improve performance? Reply #15 - 08/15/12 at 05:24:34 To attempt to answer the original question, and remembering we are dealing with a single-cylinder naturally aspirated engine, nothing you do to the outside of the exhaust pipe will make any measurable difference to performance. It will change nothing but the appearance of the pipe.
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spacepirates

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Re: Does a cooler exhaust improve performance?
Reply #16 - 08/15/12 at 06:30:37

Charon wrote on 08/15/12 at 05:24:34:

To attempt to answer the original question, and remembering we are dealing with a single-cylinder naturally aspirated engine, nothing you do to the outside of the exhaust pipe will make any measurable difference to performance. It will change nothing but the appearance of the pipe.

Agreed. On some other, high performance engines, this coating (and/or header wrap) might (*might*) have some performance benefits due to keeping heat inside of the pipe causing the gasses to stay hotter and hotter things move faster.

On the savage, this would have *no* performance benefits.

However, it could be done for aesthetic reasons, which we leave up to your discretion. I have header wrap on my bike so that I could ditch the heat shield and not worry about burning my hands/boots/pants so easily. I don't think you'd get the same insulating benefits from the ceramic coating as I imagine that'd still be mighty hot to the touch.

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teabowl13

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Re: Does a cooler exhaust improve performance?
Reply #17 - 08/15/12 at 06:43:01

Ceramic Coatings and fiberglass wraps, as I understand it, will have a small effect and help somewhat when you are working with a single-walled exhaust pipe; those pipes will lose heat pretty quickly.

If you were to cut a Savage exhaust header in half, you'd see that it is constructed (lord know why Suzuki went to all this trouble...) in three full layers of metal. A tube inside, with a tube around that, with another tube around that one. Those layers already do the job that any wrap or coating might do, so on a stock Savage header, it won't have any effect at all...

Build your own header, and you might have a different experience...

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teabowl13

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Re: Does a cooler exhaust improve performance?
Reply #18 - 08/15/12 at 06:47:10

One more thing...
Header wraps or ceramic coatings will keep the outside of the exhaust pipe slightly cooler; I don't know how much, or if you would even be abel to notice it, maybe just a few degrees, but a few folks here have used the fiberglass wrap to keep themselves from being burned by their own pipes, or to avoid melting their glossy satin polyester track suit pants while they are riding....

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greenmonster Senior Member Offline Hellooooo Nurse! Posts: 420 Vancouver BC Gender:	Re: Does a cooler exhaust improve performance? Reply #19 - 08/15/12 at 11:31:15 teabowl13 wrote on 08/15/12 at 06:47:10: ... to avoid melting their glossy satin polyester track suit pants while they are riding.... There's a mental image I'm not going to be able to get rid of any time soon.
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Savage_Rob

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Re: Does a cooler exhaust improve performance?
Reply #20 - 08/15/12 at 11:40:53

teabowl13 wrote on 08/15/12 at 06:47:10:

One more thing...
Header wraps or ceramic coatings will keep the outside of the exhaust pipe slightly cooler; I don't know how much, or if you would even be abel to notice it, maybe just a few degrees, but a few folks here have used the fiberglass wrap to keep themselves from being burned by their own pipes, or to avoid melting their glossy satin polyester track suit pants while they are riding....

The ceramic coating on my header makes a noticeable difference to the rider. I don't use any bolt-on or clamp-on heat shield with it at all and I don't burn my leg. Of course, I don't wear shorts and sneakers either.

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paulmarshall Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 1268 Carterton,New Zealand Gender:	Re: Does a cooler exhaust improve performance? Reply #21 - 08/15/12 at 13:35:06 Thanks everyone.
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Oldfeller--FSO

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Re: Does a cooler exhaust improve performance?
Reply #22 - 08/15/12 at 13:41:09

greenmonster wrote on 08/15/12 at 11:31:15:

teabowl13 wrote on 08/15/12 at 06:47:10:

... to avoid melting their glossy satin polyester track suit pants while they are riding....

There's a mental image I'm not going to be able to get rid of any time soon.

Those are a dull mat finished good looking polyester cotton blend nowadays, mind you. I am not "Leisure Suit Larry" and I am not sure you can even buy pure poly pants any more.

..... brief flashing visions of pure polyester spot welded to suffering red oozing skin from years past .....

Roll Eyes

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rfw2003

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Re: Does a cooler exhaust improve performance?
Reply #23 - 08/15/12 at 13:53:18

Well I'm not sure how well it works on Single lung engines, but coatings that keep the exhaust heat inside the pipe rather then radiating into the air do provide some benefit. It keeps exhaust velocities up there by promoting better scavenging effect in the cylinder for removal of the burnt and unburnt gases in the previous power stroke.

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Blinky-FSO

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Re: Does a cooler exhaust improve performance?
Reply #24 - 08/15/12 at 14:09:13

Quote:

I am not "Leisure Suit Larry" and I am not sure you can even buy pure poly pants any more.

Yes but some of us, well at least this one here, have a few left in the back of the closet. I knew what color socks went with a lime green suit and white shoes! Cool

Not that I ever plan to ride in a Leisure Suit, but the pipe did take a bite out of my Fieldsheer armored mesh pants. I had to ask the Mrs. to sew in a leather patch.

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Savage_Rob Serious Thumper Alliance Member Offline Mechanically Inclined Amateur Posts: 6972 Texas (Dallas area) Gender:	Re: Does a cooler exhaust improve performance? Reply #25 - 08/15/12 at 14:12:11 My Firstgear overpants have a patch of different fabric in that part of the leg.
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clueless-FSO Senior Member Offline Posts: 454 Birmingham, Al Gender:	Re: Does a cooler exhaust improve performance? Reply #26 - 08/15/12 at 18:12:32 Just a thought. Seems a properly tuned engine, would run better, cooler, longer, than an improperly tuned engine. These bikes come running extremely lean, increasing the temp. Tune it right with any exhaust = cooler temps.
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TROX Full Member Offline More ideas than $$$ Posts: 118 Temple, TX Gender:	Re: Does a cooler exhaust improve performance? Reply #27 - 08/15/12 at 18:27:00 While on the topic of exhaust, I plan on wrapping my pipes and leaving the heat guard off. The plus side I never wear poly pants, always jeans and boots, but I shouldn't have a problem with that should I ? I try to be vigilant about not putting my foot against the exhaust anyhow.
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Re: Does a cooler exhaust improve performance?
Reply #28 - 08/16/12 at 14:34:56

clueless-FSO wrote on 08/15/12 at 18:12:32:

Just a thought. Seems a properly tuned engine, would run better, cooler, longer, than an improperly tuned engine. These bikes come running extremely lean, increasing the temp. Tune it right with any exhaust = cooler temps.

While that's true as far as it goes, the exhaust is still friggin' hot.

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Cavi Mike Serious Thumper Offline Thumper n00b Posts: 1005 Rochester, NY Gender:	Re: Does a cooler exhaust improve performance? Reply #29 - 08/16/12 at 19:38:08 The engine runs hotter and even the exhaust gas runs hotter on a lean-tuned bike but on a rich-running bike the unburned fuel in the exhaust will continue to burn once it's expelled. This actually makes your exhaust piping hotter and THAT'S why the pipe turns blue. There is a fire going inside your exhaust.
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