Manifolds and blistering powdercoat = heat shields?

Manifolds and blistering powdercoat = heat shields?

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Discussion

andy43

Original Poster:

9,548 posts

253 months

Friday 20th March 2015
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I have blisterage on my chassis - only minor but I'm thinking of ways to stop it...



Having searched a bit on here, wrapping manifolds can cause cracking and rust, and I suspect the cost of ceramic coatings would cause divorce, so I'm thinking about making some heat shields up from ally and stainless-strapping them to the underside of the manifolds where they come close to the chassis tubes.
Spaced off the manifolds a bit, they might reflect some of the heat away from those tubes.

Something like this one from a Fiesta, but much less elegant as I will be handforming mine, using virgin aluminium sheet combined with time-honoured coachbuilding techniques wink


Good/bad/lunatic idea? Or should I just repaint the affected areas with something heat resistant and hope if doesn't happen again?

stesrg

1,559 posts

237 months

Friday 20th March 2015
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You want some half moon polished stainless tube !! if you wait I will show you how I will be doing mine with mounting brackets :-)
Ste .

andy43

Original Poster:

9,548 posts

253 months

Saturday 21st March 2015
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Thanks for the replies - both are better ideas than mine smile
Something formed to go over the rails is much better - I've just found that Nimbus stuff is also available from Demon Tweeks in a lighter weight (cheaper!!) format here - http://www.demon-tweeks.co.uk/motorsport/heat-shie...
Ste - you posted nearly 24 hours ago - finished the heat shields yet? Pics? wink

stesrg

1,559 posts

237 months

Saturday 21st March 2015
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Hi Andy lol interior 1st mate !! Engine out sep ? So will be sorting stuff out like that on an empty engine bay ;-)?
But will be able to get it right and so a few spare so they can easily be slid into place and slightly off the chassis with a couple off stainless fasteners ! I have some good ideas so watch mi posts ;-) .
Ste .

macdeb

8,492 posts

254 months

Sunday 22nd March 2015
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At first glance it looks to me as if the chassis in that area has been coated before with something not suitable. Yes the heat from the manifolds can cause discolouration etc and it's easy to improve on standard. I think I'd like to see what's beneath the bubbling first so as to be sure there isn't anything more sinister beneath as some 'bubbling' has occurred away from the direct heat source.

andy43

Original Poster:

9,548 posts

253 months

Tuesday 24th March 2015
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It's original as far as I can tell. There's a bit of shultz-type underseal/stonechip sprayed on the bits of outrigger in the wheelarches - that needs to come off to see what's under it - but other than that I reckon it's blackpool powder coating throughout.
What I should do is rub it down where it's blistered and repaint but I'm going to cover it in WD40 for now and wait 'til the winter. I might have a go at making shields with that sheeting, make a mess of it and then probably get some nice stainless ones from somewhere whistle

TJC46

2,147 posts

205 months

Monday 30th March 2015
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andy43 said:
Thanks for the replies - both are better ideas than mine smile
Something formed to go over the rails is much better - I've just found that Nimbus stuff is also available from Demon Tweeks in a lighter weight (cheaper!!) format here - http://www.demon-tweeks.co.uk/motorsport/heat-shie...
Ste - you posted nearly 24 hours ago - finished the heat shields yet? Pics? wink
Wrapped mine in foil faced glass cloth 5 years ago, and as i have the engine out for a new cam i stripped it off at the weekend to inspect the chassis rails.

Nearside was as new, and offside had a localised rust area, where the paint had burnt off. This happened because of a failed engine mount which allowed the manifold to touch the chassis rail, hence the burnt paint.

Pics show the damage to the offside rail, and the new cloth on the nearside which i have just recovered.

I use a combination of a first layer of high temp cloth [the brown stuff in the pic] and a 2nd layer of foil faced cloth, all held in place with foil tape initially, and then stainless steel cable ties.

Not bad after 5 years, and a must for me as i have poly bushes in the wishbones. The front rear upper is suspect to melting if you don't protect it from the heat of the manifold.

I intend to fab some kind of stainless steel plate which i can attach to the engine mount bolts, to further deflect heat from the top rear wishbone bush.






Twistygit

800 posts

152 months

Wednesday 21st October 2015
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Did anyone come up with a good solution with a heat shield?

FlipFlopGriff

7,144 posts

246 months

Thursday 22nd October 2015
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Sure its not just rust starting to bubble through as the bubbling is not where the manifold is closest.
FFG

mk1fan

10,507 posts

224 months

Thursday 22nd October 2015
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Ceramic coat the manifolds. If £300 odd is going to cause a divorce then I think its time to throw the towel in on the relationship.

Give Graham at Performance 1 Coatings a call and see what they can offer.

Just dropped off 4 manifolds (Speed 6 and Cologne V6), 4 CATs, 2 decat pipes and an engine mount for coating. Less than £900 including delivery back to me.

Twistygit

800 posts

152 months

Monday 26th October 2015
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Would ceramic coating the manifolds stop melting poly bushes or do they still let out quite a bit of heat

mk1fan

10,507 posts

224 months

Monday 26th October 2015
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Speak to Graham.

He does a super insulative coating too. Standard coating reduces heat a lot. Of course the heat is still there so just gets moved down the exhaust.

bobfather

11,171 posts

254 months

Wednesday 28th October 2015
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As above, better to wrap the upper chassis rail. You need to apply sticky back laggers foil to ensure the surface is sealed then use foil backed waterproof wrap and stainless steel ties

Foil seal





Wrap