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Wow thanks Dazz. "You’ll get more horsepower because the wrap will keep exhaust heat in the headers instead of dissipating to other areas of your engine." Yes, the more wrap you use, the more Hp. Imagine, a 500hp i30 could be yours. But wait , there's more! The first lucky callers will get.....
especially, the assertion that keeping the heat in the manifold makes the exhaust gas flow better.
Quote from: nzenigma on September 13, 2017, 22:07:04especially, the assertion that keeping the heat in the manifold makes the exhaust gas flow better. I didn't bother reading the links since the use of header heat wrap has been used for decades in racing and I'm quite familiar with it's abilities, the assertion is correct but it's not going to make enough difference on a standard vehicle.
There's the basic principle of keeping your incoming air as cold as possible, since cold air is dense air. The denser the air, the more oxygen you're feeding the combustion process. By concentrating the heat within the exhaust manifold and minimising the heat leakage using the wrap, you're giving the inlet manifold and surrounding intake path the best chance at a colder environment.
The scientific evidence I guess you'll find out there on the net but the basis of it is keeping the heat better contained within the header as hotter air will vortex more efficiently and flow faster.
The linked display Isnt related in any way, heating the pipe of a low pressure gas flow to demonstrate post combustion changes are different to fuel that has already been through the combustion process and now needs to escape under pressure. After racing drag cars for many years one tends to pick up some usable knowledge, some through theory and a lot through trial and error
doesn't get into the science of it all but the evidence is out there and the proof is with those who've had practical use and thousands of hours of flow testing.
Your Scepticism might change if you had any physical experience in the matter.As I said earlier my proof is with actual use and justified by the whole racing industry who follow the same practice, real world tests over decades have proven the benefits but as fore mentioned it's all of little benefit in stock situations.I'm out
So much for 'out'.
I'd just been up to one of the old drag racing buddies shops and he had a better explanation... "By wrapping exhaust pipe with an exhaust insulation you reduce how much heat can radiate from an exhaust header pipe and exhaust tubing. You are retaining the thermal energy inside the exhaust system, this reduces the gas density. Thinner exhaust gas, improves exhaust gas velocity inside your exhaust system. This creates a scavenging effect that pulls intake gases through the system quicker, which helps to lower intake temperatures, creating more power."
How exhaust wraps work:By wrapping exhaust pipe with an exhaust insulation you reduce how much heat can radiate from a wrapped header and exhaust tubing. You are retaining the thermal energy inside the exhaust system, this reduces the gas density. Thinner exhaust gas, improves exhaust gas velocity inside your exhaust system. This creates a scavenging effect that pulls intake gases through the system quicker, which helps to lower intake temperatures, creating more power.
He must have read that from Exhaust Wraps
After this discussion developed I decided to wander the interwebs for a consensus and found the same thing. That makes it only the 3rd time I've read that today.
Quote from: The Gonz on September 16, 2017, 10:45:32After this discussion developed I decided to wander the interwebs for a consensus and found the same thing. That makes it only the 3rd time I've read that today. It gets repeated because its so full of concise data.As would know Gonz, NASA's flight manual is Jules Verne's Journey to the Moon.
.....................then your intentions are really more just argumentative.
".... Thinner exhaust gas, improves exhaust gas velocity inside your exhaust system. ."