Exhuast wrapping

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gazpilot
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Exhuast wrapping

Post by gazpilot » Tue Aug 07, 2018 10:49 am

So I have a new engine and its running great but I could do with a rolling setup in Suffolk if anyone knows a good place.

It's a 1955cc with all new components, remote oil filter and a concept remote cooler. I have an oil temp gauge fitted and it never goes above 200, even after a 2 hour run in current temperatures but the engine bay/valence gets really hot.

I have the vintage speed equal length full flow exhaust with J tubes so I'm guessing this may be an issue, would exhaust wrapping or coating help with the heat issue.

Regards, GD
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Re: Exhuast wrapping

Post by JonnyCJ » Tue Aug 07, 2018 3:48 pm

I had an equal length VS exhaust and wrapped the header pipes. It did help keep temps down, but I also put heat shield on the back of the rear valance and under the rear exhaust tin (effectively the rear apron/deck). My engine bay temp was fine.

Make sure you don't have any holes in the tin. if you do, block them off. Heat in the engine bay translates to hot air going into the carbs, which doesn't help things.

Sound like you're not running OG tin - that will also affect cooling of the engine and ensuring it gets to operating temp quickly, before being cooled. In particular, the under cylinder tin which blows hot air out of the back of the engine.

You also don't want the oil in the pushrod tubes cooking with the heat from the exhaust.

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Re: Exhuast wrapping

Post by gazpilot » Tue Aug 07, 2018 5:39 pm

It’s the push rod tubes I’m concerned about as I can’t fit the under cylinder tin due to the headers.

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GD
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Re: Exhuast wrapping

Post by JonnyCJ » Tue Aug 07, 2018 8:11 pm

A sexy looking engine ain’t much good if it’s sat in a workshop being rebuilt !

I would definitely get the headers wrapped and also think about fabricating a tin shield to go between the headers and push rod tubes. Some people say that over time the exhaust can deteriorate from being wrapped, but the headers are cheap and easy to replace compared to the engine.

I know Si at Butty’s Bits has made some industrial shields for standard j tubes, but they only work with the lower tins in place. I’m running them on my engine and changed from equal length to VS j tubes.

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Re: Exhuast wrapping

Post by gazpilot » Tue Aug 07, 2018 8:23 pm

Yep know what you’re saying, I’ll get some wrap on it and see if I can get some tin fabbed up.

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Re: Exhuast wrapping

Post by vwJim » Tue Aug 07, 2018 9:40 pm

I've seen SS exhausts killed with exhaust wrap. I don't know what grade SS the VS exhausts are, but never needed to wrap them.

Also, you can fit industrial lower tinware to that style exhaust. Takes some tweaking, but it is possible.
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Re: Exhuast wrapping

Post by type21f » Wed Aug 08, 2018 3:51 am

Yes wrap and shields..
I have 1766cc with heat exchangers and fitted standard tin but the VS exhaust is close to the valence.
As said I checked for all gaps n sealed all holes..then fitted reflective foil to back of valence to prevent paint burning.
Keeps it cooler..
I only have a remote filter on this bus but shielded the armoured oil feed pipes with velcro sealed insulation tubes.
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Re: Exhuast wrapping

Post by 58splitty » Wed Aug 08, 2018 4:56 pm

I reckon that might damage your engine at some point, the under tinware flows the air through and under. Thats gunna heat up the heads I would have thought.
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Re: Exhuast wrapping

Post by JonnyCJ » Thu Aug 09, 2018 9:01 pm

7B8E5C6E-6118-44C7-9601-509DC27EDB0A.jpeg
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Here’s my wrapping and tinware to give you an idea

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Re: Exhuast wrapping

Post by gazpilot » Thu Aug 09, 2018 9:06 pm

Thanks for that, gonna give the wrap a try as I’ve already done the heat shield thing. The industrial tin won’t fit as I can’t fit rear lower cylinder tin, if it’s still hot I’ll change the exhaust.

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Re: Exhuast wrapping

Post by JonnyCJ » Fri Aug 10, 2018 6:01 am

Also get yourself an OG D stamped crank pulley off eBay. They’re a larger diameter and therefore spin the alternator and cooling fan faster, giving greater flow of air over the engine.

Lock wire is good for keeping the exhaust wrap in place and don't worry when the wrap starts smoking, it'll only last a few mins and is part of the process :o

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Re: Exhuast wrapping

Post by orb » Sun Aug 12, 2018 11:20 am

There is nothing wrong with heat wrap but I wouldn't bother until you've had it set up on the dyno as that might be the reason it's running a little hot, too lean, timing not spot on etc

Just a thought 😁

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Re: Exhuast wrapping

Post by gazpilot » Sun Aug 12, 2018 8:21 pm

Cheers orb just can’t find a Dyno in Suffolk at the mo. Turned the mixture up a little to richen (if that’s even a word) it up a bit. I’ll wrap it and look a little further afield for a rolling road.

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Re: Exhuast wrapping

Post by JonnyCJ » Mon Aug 13, 2018 7:26 am

If you're dynoing pre-wrapping you'll be setting it up with a very high ambient temperature.

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