Hi,
Yes, I already have a coated exhaust, inside and out, however, there was
still a fair level of heat coming off the exhaust after a race, which must
have a negative performance affect with heat in the area of the carbs. When
I added the wrap, I can hold my hand on the wrap after a race.
No comments on the longevity bit, however paint (or stainless) should
retard any rust affect.
Anyone know of actual experience and independent measurement? i haven't
checked the web sites yet.
Regards,
Howard
-----Original Message-----
From: Ronnie Day [SMTP:ronday@home.com]
Sent: Sunday, 28 November 1999 3:01
To: datsun-roadsters@autox.team.net
Subject: RE: Headers - Tip
>Also in any case, while the headers are out 1) paint them with an engine
>enamel (outside) to protect from rust 2) wrap them with an exhaust wrap,
>(read instructions about wetting it) 3) paint the wrap with a "spray on"
>that is specifically designed for that (after drying wrap in a warm
place).
> This will lead to better performance as it will help the carbs to get
cool
>air.
Consensus on the 510 list appears to be that wrapping headers or cast
manifolds is harmful to the header or manifold over time, especially on a
daily driven car. The contained heat, probably along with any moisture in
the system, literally bake the manifold to death. There are a couple of
coating processes that are more durable than painting and accomplish most
if not all of the heat retention that you're looking for in a wrap. The
best known is the Jet Hot system and another less known is offered by
Strain Technologies (I think). Come to think of it, I think I discovered
this second option from a post here in the past.
Both systems involve coating both the inside and outside of the piece
being treated with a "secret sauce" ceramic like material and then baking
the piece to bond the coating to the piece. I'm going to have the Stahl
header for our E/Prepared car done, as much to preserve the header as to
retain exhaust heat and pass it through the tail pipe. Cost will be in
the $150-$175 range plus shipping.
I know we need rain here, but if I'm going to have the E/P car ready for
Thunderhill and Shasta next July I hope we have the mild winter that's
being predicted.
FWIW, Ron
________________
Ronnie Day
rday@home.com
Dallas/Ft. Worth
'71 510 2-dr (Prepared class autocrosser)
'73 510 2-dr (Street Toy)
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