Lotus Elan

Clutch Slave cylinder Heatshield

PostPost by: Grizzly » Fri Nov 20, 2015 8:06 pm

This stuff is the future if your making heat shields http://www.nimbusmotorsport.com/ProdSho ... &CATID=252

I found with my +2 being sat in traffic the Clutch would play up and the engine mount lasted about 8-12 months before the metal separated from the rubber, i assume it was due to exhaust heat (only became really bad after i fitted a Stainless exhaust). So i made two shields from the nimbus 2 and not had a problem since.

On my 2 seater i have a Ceramic coated exhaust manifold and even though its still gets hot (obviously) it doesn't radiate heat into surrounding things (expensive but saves making heat shields... if you do ever go that way don't get the Performance white :( )
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PostPost by: prezoom » Fri Nov 20, 2015 10:21 pm

I coated my exhaust header in titanium, both inside and out. Still looks good since 2006. Have never had a heat related problem with my clutch slave cylinder. It did start leaking soon after the coating, but that was do to inclusions in the castings.
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PostPost by: The Veg » Sat Nov 28, 2015 10:13 pm

The shield looks like a nice simple thing that should work well. If one wants to add insulation to it, there was some stuff I used on my former Esprit to insulate the boot floor/engine compartment wall, which was just a piece of fibreglass that could get warm enough to melt the carpet in the boot. The insulation stuff was a woven Kevlar fabric with aluminium stuck to one side and adhesive on the other side. I was a bit skeptical at first, but it worked a treat and even stood up to the heat from the turbocharger just two inches away. I got the stuff from Jeg's here in USA, but I would think you can get it on any continent. Cut to shape with ordinary scissors, peel off the backing-paper, and stick in place. Done.

I have no personal experience with header-coating, but have heard good results from various enthusiast-circles. Over this side of the world, Jet Hot is well-respected keeping the heat inside the pipe.
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PostPost by: Grizzly » Sun Nov 29, 2015 1:36 pm

Have to admit i've been impressed with some of the self adhesive heat barriers you can get now, most of the cars we restore need to look original under the floor so we use allot of Dynamat under the carpets but of late we have had issues with the exhaust discoloring the floor (Yes i know bit OTT) so we now run a layer of Zircotec Zircoflex self adhesive ceramic heat protection between the exhaust and the floor in high temp areas. I really thought it would peal off after a run but the hotter you get it the better it seems to stick.
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PostPost by: ceejay » Sun Jan 17, 2016 5:32 am

Keep it simple folks, this has been on my S2 elan for about 28 years, deflects all of the exhaust heat.
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PostPost by: The Veg » Sun Jan 17, 2016 5:58 am

Here's the one I made a few weeks ago. It's just some thin stainless scrap I pilfered from the office (don't tell my boss! :mrgreen: ) covered on both sides with some of the stick-on insulation I mentioned in my previous post in this thread. The insulation isn't so much for actual insulation as much as to reduce noise since the shield may flop around a little and is in a quite narrow space between the exhaust and the slave.

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Poor shot of it installed:

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PostPost by: ceejay » Sun Jan 17, 2016 6:16 am

Anything will work as a heat shield to block radiated heat. As long as what ever is used can be easily removed when the slave cyl requires serving or bleeding.
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PostPost by: The Veg » Sun Jan 17, 2016 6:38 am

I agree Col; mine is attached by that one clutch-cover bolt just like everybody else's. I did plumb up a remote bleeder too while I was in there, just to make life that much easier.
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PostPost by: john.p.clegg » Sun Jan 17, 2016 11:52 am

Rusty exhaust pipes....don't tell me you use yours as well ....

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PostPost by: The Veg » Sun Jan 17, 2016 4:04 pm

john.p.clegg wrote:Rusty exhaust pipes....don't tell me you use yours as well ....

John :wink:


No, I hope to use it! :mrgreen:

I've only had the car for a bit over a month and in that time have driven it maybe 1/8 mile. Previous owner kept it garaged but only drove it about 200-300 miles in five years of ownership. I suspect that that exhaust is the original, which somebody welded to a newer pipe right after the Y that goes all the way to the silencer, which is clamped on but was impossible to remove from the long pipe when I dropped the exhaust system on my first day of ownership to get at the slave cylinder. I'd love to bin the whole exhaust system in favour of something nice with a header and all easily removable for service, but that's -no pun intended- down the road a bit.
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PostPost by: RichC » Sun Jan 17, 2016 6:39 pm

titanium exhaust wrap works fine. Keeps the whole engine bay area cooler, not just the slave cylinder & I guess is keeping the exhaust gas temperature a little hotter further down the exhaust system . I changed the cooked slave cylinder rubbers 7 years ago now & haven't had a problem since .... but then i don't hammer the engine !!
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