Classic cars forum & vehicle restoration.
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Rick Site Admin
Joined: 27 Apr 2005 Posts: 22458 Location: UK
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Posted: Thu Jun 30, 2022 10:30 pm Post subject: Exhaust wrap on cast iron manifold |
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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 _________________ Rick - Admin
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bjacko
Joined: 28 Oct 2013 Posts: 364 Location: Melbourne Australia
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Posted: Fri Jul 01, 2022 7:00 am Post subject: Dodge - Heat shields |
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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: 4117 Location: South Cheshire
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Posted: Fri Jul 01, 2022 7:35 am Post subject: |
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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: 6342 Location: Derby
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Rick Site Admin
Joined: 27 Apr 2005 Posts: 22458 Location: UK
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alastairq
Joined: 14 Oct 2016 Posts: 1956 Location: East Yorkshire
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Posted: Fri Jul 01, 2022 11:23 am Post subject: |
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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?? _________________ Dellow Mk2, 1951 built, reg 1952.
Fiat 126 BIS
Cannon special [1996 registered. Built in 1950's]
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Ford Pop chassis, Ashley 1172 bodyshell, in pieces. |
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MVPeters
Joined: 28 Aug 2008 Posts: 822 Location: Northern MA, USA
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Posted: Fri Jul 01, 2022 12:04 pm Post subject: |
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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! _________________ Mike - MVPeters at comcast.net
2002 MINI Cooper 'S' |
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