The actual exhaust temp depends on the load on the engine. Also depends on
quality or degree of blockage in muffler.
My previous vehicle had a partically collapsed muffler. I only discovered
this when I noticed the exctractors were glowing a dull cherry red.
I also managed to get them to glow when I used to tow a 3000kg trailer.
My current vehicle also has extractors, I have had to resort to a high
temperature wrap for part of the pipework to stop melting starter motors and
wiring.
If I were fitting extractors again I would either have them completely
ceramic coated or else wrap them in this high temp bandage before fitting
them.
Stuart Goggin
-----Original Message-----
From: James Nazarian <jamesnazarian@netzero.net>
To: mgb-v8 list <mgb-v8@autox.team.net>
Date: Friday, November 03, 2000 7:17 PM
Subject: Re: Exhaust Temp
>So far I have gotten a couple of good responses, but to clarify one thing:
I don't think that anyone has done what I am doing with the exhaust so
numbers I am looking for are approximate for my needs. I just want to know,
regardless what system you use (I'll pretend they all make the same heat
here except coated) what temps do you get on the collector and on any
convenient part of the exhaust pipe. The big decision here is, am I going
to need special paint on the rockers, so I want to get some numbers together
to try and make an educated decision.
>
>I don't know if the average car has an average temp for the exhaust, and I
don't know if the V8s fit into the average, but I'll take any numbers from
any car you have if need be. The more data I can get the better I will feel
about deciding on insulation and paint. thanks again.
>
>--
>James Nazarian
>71 MGB roadster
>71 MGBGT (the one that is supposed to be a v8)
>01 Impreza 2.5RS
>
>"Given a conflict, Murphy's law supercedes Newton's."
>-Anon
>
>"Nothing good has ever been reported about the full rotation
>of a race car about either its pitch or roll axis."
>-Carroll Smith
>On Fri, Nov 03, 2000 at 07:39:22PM -0500, Jim Stuart profoundly declared:
>> Not quite ready to fire mine up yet- the new one- but I had the RV8 style
headers Jet Hot coated. Will wait & see about the rest of the system, but I
am not going through the rockers.
>>
>> Jim Stuart
>>
>> James Nazarian wrote:
>>
>> > Hello all,
>> > Does anyone have a reasonable estimation of the temperature the exhaust
reaches on their V8s? I am particularly interested in temp near collector,
and the temp at any other place in the exhaust pipe. As many of you know my
headers are going out the fenders and through the rockers and now that they
are built I am investgating how much heat sheilding I will need, and if any
special paint will be needed on the rockers to keep from burning off.
>> >
>> > The exhaust would be done too, except I got held up when my thumb had
an intimate meeting with the business end of my hacksaw.
>> > --
>> > James Nazarian
>> > 71 MGB roadster
>> > 71 MGBGT (the one that is supposed to be a v8)
>> > 01 Impreza 2.5RS
>> >
>> > "Given a conflict, Murphy's law supercedes Newton's."
>> > -Anon
>> >
>> > "Nothing good has ever been reported about the full rotation
>> > of a race car about either its pitch or roll axis."
>> > -Carroll Smith
>
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