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Exhaust wrap on cast iron manifold
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Rick
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Joined: 27 Apr 2005
Posts: 22429
Location: UK

PostPosted: Thu Jun 30, 2022 10:30 pm    Post subject: Exhaust wrap on cast iron manifold Reply with quote

I've been making up a couple of heatshields to go under big Dodge's bonnet lately, in a bid to reduce the temps around the fuel pump and carb put out by the exhaust manifolding and forward sections of the exhaust that run close by. Part of the exhaust is wrapped with high-temp exhaust wrap and I plan to do some more. I've been wary so far of also lagging the cast iron manifolding with this stuff, as I'd be worried about the manifold (impossible to replace) cracking by running hotter as a result of the wrapping.

Is this likely? Am I worrying unnecessarily?

RJ
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bjacko



Joined: 28 Oct 2013
Posts: 351
Location: Melbourne Australia

PostPosted: Fri Jul 01, 2022 7:00 am    Post subject: Dodge - Heat shields Reply with quote

Why do you think all this is necessary when these cars ran in hot climates perfectly well e.g. Miami, Cuba even Australia.
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ukdave2002



Joined: 23 Nov 2007
Posts: 4100
Location: South Cheshire

PostPosted: Fri Jul 01, 2022 7:35 am    Post subject: Reply with quote

Rick

I think given the rare nature of the manifold, I would leave well alone. Insulating the manifold will make it heat up more quickly and its quick changes in heat that can cause cracking. It would be very difficult for anyone to predict how an insulated manifold would heat up and what consequential stresses it would be subject too; it may be absolutely fine, but equally you may stress a weaker part of it.

Our gasket manufacturer also supplies a high end UK sports car manufacturer, said manufacturer had problems with cars exported to Dubai suffering from heat related issues in the fuel system, there was next to zero room to add insulators, the gasket manufacturer sourced a thin insulating material from which they made a number of manifold replacement gaskets; it solved the problem.
We have an insulating gasket made from the same material for Morris 8's https://tinyurl.com/ywwzwh2a to relieve fuel evaporation issues, they work really well, we have sold 100's of them, being only 3mm thick don't present a problem when fitting.

If heat is problem, possibly a better route would be (as you have started) to try and protect the affected components rather than eliminate the source?

Dave
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Ray White



Joined: 02 Dec 2014
Posts: 6283
Location: Derby

PostPosted: Fri Jul 01, 2022 8:48 am    Post subject: Reply with quote

I agree. Never insulate cast iron manifolds with exhaust wrap.

https://www.heatshieldproducts.com/blog/tech/dont-use-exhaust-wrap-on-cast-iron-manifolds
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Rick
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PostPosted: Fri Jul 01, 2022 9:16 am    Post subject: Reply with quote

Thanks for your constructive input gents, I'll leave well alone and stick with plan A.

RJ
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alastairq



Joined: 14 Oct 2016
Posts: 1950
Location: East Yorkshire

PostPosted: Fri Jul 01, 2022 11:23 am    Post subject: Reply with quote

Best plan, not to wrap.

The problem lies with modern fuel. Nothing like the stuff plonked in the Dodge, back-in-the-day.

Trying to make do & mend to overcome fuel evap issues will be like trying to get me to use a modern car. Reluctance in bucketloads, and a grumpy pensioner to boot.

This isn't an uncommon problem.

In the end, it depends on whether you want the Dodge to be almost as it was, and tolerate [put up with?] the fuel issues?
Or, get the thing to run something like reasonably...as it did when it was newer.

To that end, it might be an interesting exercise to experiment [first of all, before making things more 'permanent?'} with putting in a return fuel line.

Also, replacing the mechanical fuel pump with a discrete electric pump. [Old pump need not be removed, and can be left 'plumbed in', to all intents & purposes....]
The Americans have had this issue with a lot of their more modern[but still 'old'] vehicles...

They have, on their market, fuel filters with two exit ports, to neatly include a [smaller diameter] fuel return pipe. Some even have a non-return valve, to prevent fuel back-syphoning from the carb itself [a problem with V8 engines especially]...

The fuel return pipe can be spliced into the fuel tank filler tube[easiest, probably] and ideally should return the [warm] fuel to the part of the tank away from the fuel pickup.

OK, so its all coming away from 'original'...but hey....the Dodge didn't have these issues back in the 50's and 60's.....so, conking out every now & then isn't 'original' either.

Anyway, just a thought? You seem to have enough to occupy your time as it is?? Smile
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MVPeters



Joined: 28 Aug 2008
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PostPosted: Fri Jul 01, 2022 12:04 pm    Post subject: Reply with quote

Rick
Take a look at a Rover 2000 TC - there's a simple aluminium sheet between the manifold & the carb linkage. Without it, the plastic connectors on the linkage melt!
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