Header Wraps

[PoppaDre]

Is there any advantage to header wraps, other then not getting burnt when you touch the header?

[Agemax]

Is there any advantage to header wraps, other then not getting burnt when you touch the header?

NO, they look ****e, they dont have any performance enhancements and, they look ****e!

why bother? they probably cause the engine temp to rise, get all dirty and soggy with the road grime thrown off the front wheel, and if i havent mentioned it already.......................

I HATE THEM

(arguments welcome but im not a nasty man, just my opinion)

[rapidray]

Actually, the above statement is WRONG! They are used to keep the exhaust heat INSIDE the pipe to cause less contraction of the gasses to improve scavenging. Dyno testing an FZR 1000 road race bike in 1996, we saw a 2 HP gain when we did back to back tests. We then removed it for a 3rd test & saw the 2 lost again. We reinstalled it, just to make sure, & got the 2 horses back. Granted, it's not a HUGE gain but in road racing 2 equal powered bikes down the front straight to the checkered flag, that 2 horses CAN be big!!! They also help in pulling more heat OUT of the engine & keeping header temps down for the parts around the exhaust system! Ray.

[Rudeman]

NO, they look ****e, they dont have any performance enhancements and, they look ****e!

why bother? they probably cause the engine temp to rise, get all dirty and soggy with the road grime thrown off the front wheel, and if i havent mentioned it already.......................

I HATE THEM

(arguments welcome but im not a nasty man, just my opinion)

Could not have said it better myself!!

In other words they look like s h i t!

[Agemax]

Actually, the above statement is WRONG! They are used to keep the exhaust heat INSIDE the pipe to cause less contraction of the gasses to improve scavenging. Dyno testing an FZR 1000 road race bike in 1996, we saw a 2 HP gain when we did back to back tests. We then removed it for a 3rd test & saw the 2 lost again. We reinstalled it, just to make sure, & got the 2 horses back. Granted, it's not a HUGE gain but in road racing 2 equal powered bikes down the front straight to the checkered flag, that 2 horses CAN be big!!! They also help in pulling more heat OUT of the engine & keeping header temps down for the parts around the exhaust system! Ray.

so why dont drag bikes or motoGP bikes or any other race bikes for that matter run with them? 2bhp on any race bike, as you say aint a lot but it could mean the answer between winning or losing!

[rapidray]

I can't answer that one for you. Maybe on a peaked out, MAX HP motor, it doesn't show up the same. I know for a FACT that on lower HP motors it DOES though! Plus, it is a GREAT heat insulator to keep more heat away from surrounding parts. Ray.

[49er]

I can't answer that one for you. Maybe on a peaked out, MAX HP motor, it doesn't show up the same. I know for a FACT that on lower HP motors it DOES though! Plus, it is a GREAT heat insulator to keep more heat away from surrounding parts. Ray.

Ray, can you explain how they "pull extra heat out of the engine".

My experience when I did it on my rotary powered rally car was just the opposite.
When cruising, my engine temps were slightly elevated, when the engine was in race mode, the temps rose alarmingly so, to the point where I would have cooked the engine during any longer special stages. There is a fair amount of heat radiation occurring at the headers, which is beneficial to engine cooling, especially during the summer months.

I'm not surprised that the HP benefits are that low. But as you say, a 2hp gain is huge on a race track.

[Hammered]

One of the ways tape and other thermo blocker work is by reducing the amount of preignition in the heads. A cooler head temp will allow for more horse power to be generated. Im no fan of the look of exhaust wrap and IF youre looking for that boost a thermo blocker would give. Look into Techline's exhaust coating.

[rapidray]

I have NO experience or education in rotary engines so I can't tell you if there is something involved in excessive exhaust heat in them. Wth the exhaust heat retained in the header & it speeding the exhaust flow, is what I meant by pulling heat out of the engine. We never showed higher engine temps with the header wraps but maybe there is something different about rotary design or operation that makes them more sensitive to exhaust temps. Ray.

[dlanes]

It is does increase power. I would say 5% increase MAX. Sold wrap for many years, it's been dyno proven on my previous vehciles.

[Agemax]

It is does increase power. I would say 5% increase MAX. Sold wrap for many years, it's been dyno proven on my previous vehciles.

solid proof required please

[posplayr]

A few descriptions on the subject for a moto seems that keeping heat in the pipe and improving scavenging in the principle.

http://www.350z-tech.com/zwiki/Header_wrap_vs_Header_coating

[rapidray]

What is your problem with wrap, other than how it looks?!!! It sounds to me like you've NEVER even tried it! I showed you an example, albeit a SMALL gain, but still a TRUE gain & you still want to argue. Have you even built an engine in your life or even tuned any? I do it for a living & have no reason to be misleading or dishonest about what works or doesn't. Please come back & argue about something you have EXPERIENCE with! Ray.

[Agemax]

What is your problem with wrap, other than how it looks?!!! It sounds to me like you've NEVER even tried it! I showed you an example, albeit a SMALL gain, but still a TRUE gain & you still want to argue. Have you even built an engine in your life or even tuned any? I do it for a living & have no reason to be misleading or dishonest about what works or doesn't. Please come back & argue about something you have EXPERIENCE with! Ray.

if that is aimed at me then you had better get your facts right before you start making a fool of yourself!

[rapidray]

You've shown me NO kind of experience in this one so who's the fool? If the shoe fits, it's probably on your foot. Ray.