Bolt Speedman
Newbie
So I recent read the article about exhaust heat wrapping to help keep the engine bay cooler, so I started to wonder if this could be applied to the the air intake to help keep heat out? Anybody have any thoughts?
Many manufacturers are taking the air inlet from the front wing now (VAG group particularly).
Wrapping exhaust manifolds is about keeping the heat in more than stopping it from getting out if you can understand that. Keeping spent exhaust gases hot, aids quicker exit, on turbocharged cars you want to keep those gases to propel the turbo. Yes it can assist engine bay temps slightly but it's true purpose is as above.
I understand that old chap , I just wanted to add the real side of the issue so that the younger fraternity don't think that that's all the stuff is for.
Hell, most of the youth think a NISMO sunscreen will add b.h.p. whereas we know it only works if you have H.K.S. badges on the wings too.
may look like a fool here but, are you saying that for turbo charged cars better not to seppd up the exit of exhaust gases so they are retained for the turbo therefore it is detrimental if you have a turbo to wrap the exhaust?Wrapping exhaust manifolds is about keeping the heat in more than stopping it from getting out if you can understand that. Keeping spent exhaust gases hot, aids quicker exit, on turbocharged cars you want to keep those gases to propel the turbo. Yes it can assist engine bay temps slightly but it's true purpose is as above.
Just had a thought, how many of you that are under 30 read tuning books? 'How to make your car handle', 'Engine Management Techniques', 'Turbocharging Performance handbook', etc.
may look like a fool here but, are you saying that for turbo charged cars better not to seppd up the exit of exhaust gases so they are retained for the turbo therefore it is detrimental if you have a turbo to wrap the exhaust?
I don't think that's what Country Bumpkin is saying. You can't "retain" gases for the turbo, you want them to pass in and out as quickly as possible. What you want to retain in the manifold and exhaust is the HEAT, as hot exhaust gases have more kinetic energy and higher pressure. This aids spinning the turbo.
Wrapping the exhaust is in theory also beneficial as the hotter gases can escape much more quickly, creating an area of lower pressure post turbo. It is the pressure differential between the exhaust gases pre and post turbo that determines the amount of work the turbo can do. You want the pressure to be as high as possible pre turbo (this is where retaining heat and manifold design comes into play) and pressure to be as low as possible post turbo (retaining heat, exhaust design) as this creates the largest pressure differential possible.
Comprende?
imo it makes little difference. cooling after the turbo would be more important
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