Heat wrapping question

[kwaka_crasher]

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Yes you'll retain more heat in your engine if you wrap the pipe.

No, you won't. Heat comes from the burning gases not being efficiently expelled via the exhaust. When you insulate the exhaust, the hot gases are more efficiently scavenged from the combustion chamber meaning a greater cool incoming charge.

[imdying]

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No, you won't. Heat comes from the burning gases not being efficiently expelled via the exhaust. When you insulate the exhaust, the hot gases are more efficiently scavenged from the combustion chamber meaning a greater cool incoming charge.

Yes you will, stick a head temperature meter sensor on your spark plug and try it yourself. The difference comes from having a 'really hot' piece of metal bolted to your head instead of just a 'hot' one.

[kwaka_crasher]

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Yes you will, stick a head temperature meter sensor on your spark plug and try it yourself. The difference comes from having a 'really hot' piece of metal bolted to your head instead of just a 'hot' one.

Not at all. In the case of headers, the contact area for conduction of heat to the head is limited - two studs and a narrow gasket on each header. In the case of a manifold like a car, a fat insulating gasket.

Not to mention the distance to the combustion chamber from the end of the port and surrounding coolant.

[SS90]

ho hum.

Gasses with higher temperature have less density than colder gasses, and, wrapping your headers will enable more heat to be retained in your headers/exhaust gases.......

What does that mean?

Sweet FA actually, in theory, perhaps faster speed to atmosphere, in reality, nothing.

As far as corrosion goes, it will rust out faster than you can believe.


My advise? Forget about wrapping, it's only any good for lowering under bonnet temperatures, and that is only any real benefit for forced induction.

Wrap the headers only your bike, and with-in a year, you will be looking for replacement ones!

[DangerousBastard]

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Wrap the headers only your bike, and with-in a year, you will be looking for replacement ones!

Bugger. I have to wrap only a short section, so I might look a bit of stainless steel for that part.

Steve

[kwaka_crasher]

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Wrap the headers only your bike, and with-in a year, you will be looking for replacement ones!

Not if you HPC them...

[SS90]

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Not if you HPC them...

Er, yes, but if you HPC coat them, then you gain nothing by wrapping them.

[DangerousBastard]

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Er, yes, but if you HPC coat them, then you gain nothing by wrapping them.

Surely wrapping is a much better insulator than just HPC on its' own?

Steve

[vifferman]

From threads on the VFRD forum in Mrka, HPC is very rarely long-lasting, even with VERY meticulous surface preparation. I have no idea if there is actually any data to substantiate claims about HPC performance either. I'd thought about getting my own (manky-looking) headers coated, but was rather put off by some of the stories (and the cost). The heat's only an issue for me when the bike spends too much time not moving fast enough. It seems to be more betterer now that I've replaced the mudflap behind the shock with a hugger on the rear wheel = less heat trapped there.

[SS90]

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Surely wrapping is a much better insulator than just HPC on its' own?

Steve

Most likely yes, but it depends on the situation.

If for some reason you HAD to wrap your headers, I would suggest using a stainless steel header, as that would resist the corrosion somewhat.

[DangerousBastard]

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If for some reason you HAD to wrap your headers, I would suggest using a stainless steel header, as that would resist the corrosion somewhat.

That's what I will be doing I think. My modified and re-routed header is way too close to plastic and oil seals.

Steve