NA Manifold Temperature

Quick question.

How hot should I expect an aftermarket exhaust manifold to get on my NA?

It's an OBX type stainless exhaust manifold.

Before anyone says get a probe and check - the car is currently in bits.

Just a rough idea would be great so I can look into wrapping/coating etc.

Thanks

when i had my na i had a manifold made which resulted in the heat burning a hole in my re-circulation box after my airbox, i then added bonnet vents and never had aby heat related issues after

It'll be hundreds of degrees for sure. Ive got a laser temp probe in the unit mate if you want to check

May as well wrap it as it's in bits now.

My idle was around 400-450 degrees C when warm.

EGT probe on sixth cylinder.

Your struggling to get a more accurate measure unless you use a reflective temp sensor gun to check it.

A good estimate is the internal gas temp though from the EGT probe

Being stainless and probably quite thin, its going to get/seem hotter than a cast manifold simply because it cant dissipate the heat so well due to the mass, but in reality its not going to get any hotter than the equivalent turbo manifold.

Thanks guys.

It'll be hundreds of degrees for sure. Ive got a laser temp probe in the unit mate if you want to check

That would be good mate I'll pop it round to you at some point.

May as well wrap it as it's in bits now.

Thats kind of related to the question - I've seen a few threads online about how wrapping can cause cracking, but then I've also seen a lot of high powered (and hot) cars get things like this wrapped.

I was looking into Zircotec coating options but it seems pricey.

Being stainless and probably quite thin, its going to get/seem hotter than a cast manifold simply because it cant dissipate the heat so well due to the mass, but in reality its not going to get any hotter than the equivalent turbo manifold.

Yeah as daft as it sounds it does 'seem' to be mega mega hot but general engine temps seem the same.

I would avoid spending too much cash on a cheap stainless manifold, as if it does crack ceramic coat will be wasted, usually cracks in stainless are stress related, so make sure its well braced, and if you want to just wrap it.

I would avoid spending too much cash on a cheap stainless manifold, as if it does crack ceramic coat will be wasted, usually cracks in stainless are stress related, so make sure its well braced, and if you want to just wrap it.

Yeah I see what you mean.

Think the ceramic coating would cost three times as much as the actual manifold.

The stock cast manifold has a heat shield to prevent such happenings, with the stainless steel jobbies one is not used because it doesn't look trendy.

The trendy cure for this is to put the air filter next to it and use induction to extract this hot air into the engine?

I am not sure what temperature things start to glow but the cast manifold on my old NA was glowing after a few hours of hard driving down the route de soliel. We popped the bonnet at a service station and i was surprised to see it giving off an orangey glow.

Just going back to this with a few new ideas - does anybody know for definite what material the stock NA manifold heatshield is made of?

Is it steel?

Do you have one?

If so stick a magnet on it.

If it sticks, steel, if it doesn't, it's alloy

No mate, binned it ages ago.

I think it's steel just not sure if it's a composite.

Im pretty sure its an ally sandwich, Ive got a TT one in the unit