Are you referring to a cast iron manifold? If so, why bother wrapping it.
It doesn't put out as much heat as headers do. Sure you wouldn't want to
touch either one after a few minutes of running, but the stock manifold
shouldn't boil gas or cause a heat soak problem with the starter. Which are
the best reasons for any type of heat shield anyway. The headers have
thinner walls and more surface area to radiate heat from. Hence the larger
amount of heat output from the "extractor" (header) system over the stock
manifold. If you are experiencing those problems with the stock manifold.
You have problems elsewhere that need to be examined. Those components are
designed to withstand the heat from a stock, properly tuned set up.
Shawn
-------------
Original Text
From: "jmwagner" <jmwagner@greenheart.com>, on 10/4/98 2:17 PM:
What I'm wondering is.... I can fully understand why a typical thin
walled
steel header would simply fall apart in time with the wrapping.... BUT....
what about a stock cast header.... these things are thick! If a stock
header
will only last half as long, if wrapped... who cares... what's 1/2 of
forever? I'm just curious if anyone wrapped a stock cast header, and
found
problems later? I've been tempted to do the wrapping... it would seem to
me
to be a good thing... considering the close proximity of the generator,
starter and intake manifold/carbs....
--Justin
Shawn Loseke wrote:
> That's an easy question to answer. When you unwrap the header, it falls
> apart. I've seen it happen more than once. In all cases, the owners did
not
> re-wrap their new headers. Remember that when you see racers use the
stuff,
> that doesn't mean it will work correctly for you. They often replace
> everything every few races anyway. Their idea of longevity is for the
> product to finish the race. Ours is usually a little longer.
>
> Shawn
> -------------
> Original Text
> From: "Jim Hill" <Jim_Hill@chsra.wisc.edu>, on 10/1/98 4:09 PM:
> Alan Myers wrote:
>
> > In lieu of a heat shield, has anyone on the list tried the high
> > temperature insulation wrap available for headers (and probably most
> > standard manifolds)? . . . it is supposed to not only help keep the
> > entire engine bay much cooler, but also accelerate exhaust gasses
> > passing through the system
>
> Ted Schumacher's right (DUH!):
> > be careful of header wrap. on the dyno the header wrap has been
> causing
> > the exhaust to rust. you would be better off to either ceramic coat or
> > just fabricate a heat shield.
>
> The price of keeping the engine bay cooler by wrapping the exhaust
> header is that all the exhaust heat stays inside, raising the
> temperature of the header and hastening its eventual demise. Ask someone
> what happens when you unwrap the header for inspection after a couple of
> years.
>
> Jim Hill
>
> d
e
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