Exhaust/manifold wrapping
Discussion
I`ve recently posted a thread on induction upgrades and would like to thank people for their input.My engine( 5 ltr) with the TVR power sports cam now runs alot hotter.I have covered the ducting from the air filter to the AFM with heat reflective material but the ambient heat ,I think ,is causing a problem when stationary even after the fans cutin.I know these engines run a bit rough on tick-- over ( iam hoping MA will sort this out when I go down) but when hot it stuggles and feels/sounds it will die.The question is how safe is it to wrap the exhaust and headers ---some manufacturers of these heat resistant products talk about reducing heat by up to 70% and even increasing power but Iam worried about the higher temperatures in the engine, surely that can`t be good.
Anyone able to assist
Anyone able to assist
I wrapped the manifold on the V8S and ran it like that for many years. It dropped the temperatures in the engine bay substantially. I already had a cold air intake so it didn't make a hug difference to the power, but it did significantly reduce the rate of component failures under the bonnet. It also made the engine sound a bit quieter, which can be very handy if you're struggling to get under drive-by noise restrictions at a track, but not so good if you're enjoying the V8 howl.
Some people say that the exhaust wrap traps water and accelerates rusting, others say that the trapped heat causes stress cracks in the exhaust. I can't say I noticed either of these problems on mine. I did have to have one of the collectors welded up a couple of times over the years but I don't think that's so unusual, it is a high mileage car after all.
One thing to be aware of is that the wrap turns quite brittle once it has cooked onto the exhaust, and is easily damaged while you are working on the engine. So if you do fit it, you should probably plan to replace it every couple of years.
Some people say that the exhaust wrap traps water and accelerates rusting, others say that the trapped heat causes stress cracks in the exhaust. I can't say I noticed either of these problems on mine. I did have to have one of the collectors welded up a couple of times over the years but I don't think that's so unusual, it is a high mileage car after all.
One thing to be aware of is that the wrap turns quite brittle once it has cooked onto the exhaust, and is easily damaged while you are working on the engine. So if you do fit it, you should probably plan to replace it every couple of years.
It should not increase the temps in the engine, but will increase the temp of your exhaust gas. Since the exhaust will allready be hot, I don't think being even hotter should cause any problems.
I fitted this to the wedge when I fitted new manifolds ( the first time ). The under bonnit temp was much reduced and there were no downsides......... for 18 months until the NEW ( 18 month old ) manifolds started blowing because they had rusted through. These had been purchased from a well known TVR specialist, so I picked up the phone
" If I buy some of your exhaust manifolds, how long should they last? "
" In that case, can I have my money back for the ones that have only lasted 18 months "
" Why don't you bring the car round so we can have a look "
" Whats this tape you have put on? That absorbs the moisture in the atmosphere, holds it against the steel, so of course they will rust, really not our fault"
End of story, except that I bought a pair of stainless manifold then, which have been fine ever since
I fitted this to the wedge when I fitted new manifolds ( the first time ). The under bonnit temp was much reduced and there were no downsides......... for 18 months until the NEW ( 18 month old ) manifolds started blowing because they had rusted through. These had been purchased from a well known TVR specialist, so I picked up the phone
" If I buy some of your exhaust manifolds, how long should they last? "
" In that case, can I have my money back for the ones that have only lasted 18 months "
" Why don't you bring the car round so we can have a look "
" Whats this tape you have put on? That absorbs the moisture in the atmosphere, holds it against the steel, so of course they will rust, really not our fault"
End of story, except that I bought a pair of stainless manifold then, which have been fine ever since
Equinox said:
Who will ceramic coat them?
Luckily they arent far away from you....
www.camcoat.u-net.com/
A
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