Exhaust Manifold Heat Shields

[DMT]

Happy New Year Folks.

Does any one know if there is a Heat Shield made for tubular exhaust manifold.

I would like to reduce the radiated heat from mine, that is if it is recommended to fit them.

I have some heat soak issues and although I have just insulated the fuel line and fitted a cooling fan I would to keep the under bonnet temperatures as low as possible.

Cheers

Dave

[Lingen]

Dave.
Not to my knowledge, but there are various heat resistant / insulating products to wrap round them, which work well.

[jbuckl]

85191D0F-A23C-45BB-8B38-D492C64A8878.jpeg There’s also a spray on ceramic coating too zircotec. Works well at insulating & eating up your annual stag budget too
I kept iron manifolds but had a vitreous enamel finish applied. Also quite an expensive finish, but durable & shiny. Vitreous enamel required lots of careful preparation. (Cleaning , grinding & polishing)

[DMT]

Thanks Gents.

On my MGBV8 I had firstly used ceramic tape wrap ( quickly looked manky) and afterwards had ceramic coating both inside and outside and both kept a lot of heat out of the engine bay, but, the heat was transferred further down the exhaust system and I am not sure this is a good idea. ( any ideas?) I was hoping to have a shield to stop the radiated heat transferred upwards.

I will wait until I can test my recent mods and take it from there.

Dave

[DJT]

Phoenix stainless manifolds fitted since 2014 with no heat shield or coating. No heat soak issues, paint blistering, or fuel vaporisation in the 26,000 miles since then. How effective is your engine driven viscous coupling fan?

[DMT]

Phoenix stainless manifolds fitted since 2014 with no heat shield or coating. No heat soak issues, paint blistering, or fuel vaporisation in the 26,000 miles since then. How effective is your engine driven viscous coupling fan?

Dave

My fan is good, I have had no problems with cooling even after fast running, needle always 11 0clock, but as a backup I have fitted a fan which I hope I won't need often.

I have a problem with heat soak after a very short drive, I believe the thermostat has not opened but the exhaust headers are very hot and when I restart after a 10 min stop she won't start easily.

I now can run the fan for a pre-determined time (at the moment 3 min) after I have stopped. This should help but I was wondering if there was a bolt on heat shield which might also help.

When I had my MGB headers silicon coated I was warned that the exhaust further down stream can overheat!

Regards

Dave

[Phil S]

I've read that some owners have removed about 4" of the rear bonnet seal each side to aid with air flow. Not tried this as no problem for me. I've pheonix manifolds that are ceramic coated in and out side and 2" pipes throughout.
the car is cooler inside since I've done this. May be worth checking the condition of your exhaust boxes. Yes stainless will last the life of the car, but they will also fill up with carbon and restrict gas flow. my old ones were very heavy on removal as full of crap.

[DJT]

I've read that some owners have removed about 4" of the rear bonnet seal each side to aid with air flow. Not tried this as no problem for me.

https://www.socforum.com/forum/forum/stag-owners-club/soc-forum/829854-bonnet-seal

[DMT]

Is it possible/practicable to clean out a blocked up stainless exhaust?

[Lingen]

Phil.
I fitted a stainless steel exhaust in March 1999 and it is still in good condition. I am not aware of any sooting up of the silencers, although I haven't taken them off to look. Performance and MPG are fine, and the tail pipes are clean.
That sounds more like an over rich fuel mixture, or lots of short journies perhaps?
Mike.

[Phil S]

The exhaust swap was done about 6 months after I got the car so don't know how it had been used prior to getting it. Most systems stainless or otherwise tend to fill with carbon over time.