[Healeys] [Healeys) 100-4 Heat Shield with Headers

[Michael Salter]

I have had exactly the same results as Bob, as in "no noticeable change in
temperature" despite those mods.

M

On Mon., Sep. 14, 2020, 12:21 p.m. Bob Spidell, <bspidell at comcast.net>
wrote:

> Yeah, I've heard that too (usually from the 'hot rod guys'). I wrapped my
> BJ8's downpipes about 8yrs/40K or so miles ago, and when I rebuilt the
> engine 3 years ago I checked them; no evidence of any degradation.
>
> My thinking: Rust is, of course, oxidation. Water does not rust metal, it
> facilitates oxidation by providing a medium for electron transfer between
> the oxygen in the air and the iron in steel. Manifolds, downpipes and
> headers get hot enough that the water in the exhaust gasses stays vaporized
> (until shutdown). It cools and pools in the pipes and mufflers, which rust
> from the inside out. What's unclear to me is how wrap, or ceramic coating,
> which should theoretically keep more heat in the system affects the steel.
> I would expect some embrittlement from the heat cycling, but haven't seen
> it (yet).
>
> FWIW, I had my exhaust manifold ceramic coated (Jet Hot) and downpipes
> wrapped, and didn't notice much, if any cooler running (I was
> disappointed). The side vents seem like they would help but, curiously, my
> BJ8 and BN2/100M behave exactly the same WRT engine temps. I expected the
> louvered bonnet to help prevent overheating, esp. at idle but ... nope.
>
> Bob
>
>
> On 9/14/2020 7:56 AM, Michael Oritt wrote:
>
> Common wisdom isthatexhaust wrapped to rusting out.  it took 15 years to
> happen on my car and I am not convinced even now that the wrap promoted or
> hastened the process.
>
> Best--Michael Oritt
>
> On Mon, Sep 14, 2020, 10:16 AM Charles Schott via Healeys <
> healeys at autox.team.net> wrote:
>
>> Bob,
>>
>> I did wrap the headers but I'm a belt and suspenders type of guy. Never
>> intended it to be that much work, but once I started, I wasn't going to
>> quit on it. I'm also going to install the triangular vents into the front
>> wings which should help expel the heat. And I built a false floor on the
>> driver's side to provide an air space that will act as an insulator. It
>> gets hot in Florida.
>>
>> Regards,
>>
>> Charlie
>>
>> ------------------------------
>> *From: *"Bob Spidell via Healeys" <healeys at autox.team.net>
>> *To: *healeys at autox.team.net
>> *Sent: *Sunday, September 13, 2020 11:31:10 PM
>> *Subject: *Re: [Healeys] [Healeys) 100-4 Heat Shield with Headers
>>
>> Well done, but I gotta ask, why not just wrap the headers?
>>
>>
>> On 9/13/2020 8:42 PM, Ray Juncal via Healeys wrote:
>>
>> Wow, you had fun making that. Nice work.
>>
>> On Sunday, September 13, 2020, 3:38:08 PM PDT, Charles Schott via Healeys
>> <healeys at autox.team.net> <healeys at autox.team.net> wrote:
>>
>>
>> After one more modification, the fifth one, to eliminate interference
>> with the vacuum hose fitting, I can continue with mounting the carbs. Some,
>> including me, might say it's been over engineered.
>>
>> Regards,
>>
>> Charlie
>>
>>
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