quote:
Originally posted by Navyreg1970
Another little fettle tonight that might split the vote!
I put exhaust wrap around the exhaust manifold and the first 18 inches of downpipe - the purpose being to reduce the overall engine bay temperature when running.
Theres a lot of debate on the pro's and cons of using this - mainly on performance tweaking forums where they cite engine fires due to badly wrapped pipes causing localised very hot spots - and increased corrosion rates. (but these petrol heads are talking about manifolds that glow red hot!)
The pro side of the argument mentions that keeping the heat in the manifold causes better exhaust flow - to be honest I dont think its going to make much improvement on an old perkins lump.
Without the wrap, with me gunning the engine the manifold would reach 120 - 130 degrees (centigrade)on the infra red gun, 95 degrees on idle
with the wrap the exhaust manifold now sits at 65-70c on idle (radiator at 80 degrees) and after a minute of engine thrashing the manifold gets to 80 degrees (radiator at 92 degrees) - so as you can see a big improvement on the amount of heat being emitted
I need to tidy up the raggedy ends but I think it will prove beneficial
The Dog is home....
http:www.singleusemedical.co.uk
my new business
I wrapped my manifold as I was getting a problem with fuel vapourisation due to high under hatch temperatures which wrapping fixed. I can vouch for this stuff

:
http://www.ratsport.com/PBSCCatalog.asp?CatID=1594523
Cheers
Jules
RatSport www.ratsport.co.uk