manifold wrapping
Discussion
Chaps
Has anyone got any comments regarding manifold wrapping, it would reduce under bonnet temps. but are they any other advantages/disadvantages with this. may also reduce intake temps from the ducting ?
Just a thought after seeing the griff engine shot on the le mans topic on the home page.
It's worth doing because it reduces the under bonnet temperatures - I'm sure this heat is the cause of many TVR reliability problems. I fitted exhaust wrapping to the V8S when I had the bigger engine in, no choice really because the heat off the exhaust was melting ducts and cables several inches away.
Keeping the inlet air cooler is worth doing - a 20 deg C drop is worth about 20 BHP. But it is not easy to find a source of cold air, because of the huge heat soak when the car is stationary. I suspect the best solution would be a blown air duct system like they use on some turbos, to surround the important parts in a trickle of cold air.
Cheers,
Peter Humphries (and a green V8S)
quote:
This is something I have been considering in connection to heat protecting the air intake pipe. The theory is that lower air temp could improve performance to a small degree. However, it is looking a bit costly and probably only of benefit for track work.
I've heard horror stories about exhaust wraps, with header pipes rusting to dust in no time. Anyone any experience of using this stuff on a road car?
Of course TVR pipes are supposed to be stainless - but theres stainless and stainless, mine seem to be the variety of stainless that rusts!
Driller: the heat has to come out somewhere, yes, and I've also heard of massive heat soak into the cabin as the heat is transferred further back down the pipe.
Edited by philshort on Wednesday 20th June 17:37
Driller
Ice Blue Griff500I use it on the V8S, which is a road car of course. I've seen several other TVRs with it on and it is quite common on competition cars. I assume the rusting problem is from the wrap getting splashed with water and then staying damp? That might be a problem on a lawnmower, but your TVR exhaust gets up to several hundred degrees within a couple of minutes and I can't see how the wrap could stay damp. I certainly haven't had any problem in the last couple of years/40 k miles since I put it on, and the V8S goes out in all weathers.
Yes if you insulate the exhaust the heat has to go somewhere, the point is to carry the heat *out* of the engine bay and into the air flow under the car. I can believe that in some cases this increases the exhaust temperature enough to be noticeable, but I haven't had any problem with it on the V8S. If it was a problem, I'd stick a heat shield between the exhaust and the body.
You can get this stuff from just about any motorsport accessory shop, for instance www.demon-tweeks.co.uk. I can't remember how much it cost but I payed less than a hundred quid for enough to do two cars plus loads of reflective tape. It isn't expensive.
Cheers,
Peter Humphries (and a green V8S)
quote:
I've heard horror stories about exhaust wraps, with header pipes rusting to dust in no time. Anyone any experience of using this stuff on a road car? Of course TVR pipes are supposed to be stainless - but theres stainless and stainless, mine seem to be the variety of stainless that rusts! Driller: the heat has to come out somewhere, yes, and I've also heard of massive heat soak into the cabin as the heat is transferred further back down the pipe. Edited by philshort on Wednesday 20th June 17:37
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