JoelP
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| posted on 29/10/24 at 12:20 PM |
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Snapped my clutch cable again
Pinto to type 9. It runs far too close to the exhaust. Short of a new exhaust, I have to just heat shield it and be prepared to change it
occasionally. Fortunately, the new one I already had in is a good few inches longer, so can take a better route. Unfortunately, my exhaust wrap seems
to have fallen to pieces. The exhaust passes 2cm from where the cable terminates on the bellhousing.
I need suggestions for either the best exhaust wrap, or a type of heat shield that I could squeeze into the literally 2cm gap. Any ideas? Cheers!
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nick205
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| posted on 29/10/24 at 12:53 PM |
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A PITA, would changing to a hydraulic clutch improve things?
Appreciate there's some cost and work involved, but if it overcomes the issue and gives a better clutch feel.
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obfripper
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| posted on 29/10/24 at 03:25 PM |
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It's prably worth finding a heat shielding sleeve like used over lambda sensor wiring and covering the portion of the cable that passes the
manifold.
For example:
https://cpc.farnell.com/sleeve-it/firesleeve-22mm-1m/fireproof-sleeving-22mm-1m-red/dp/CB23792
There are versions that have metallic coatings that reflect the heat as well, I can't think of any oem ones that might be suited to fitting over
a clutch cable offhand though.
This should protect the cable pretty well, for any further shielding an aluminium sheet between the manifold and cable may help if there are suitable
hard mounting points.
Any heat shielding from the underside of a scrap car could be reused for this, the bits round the fuel tank and tunnel are ideal.
Dave
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jacko
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| posted on 29/10/24 at 03:31 PM |
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Can you run the cable through. A steel tube and maybe wrap that as well as the exhaust You can get heat protection for cables that may go over
piping
G
555
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JoelP
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| posted on 29/10/24 at 06:19 PM |
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Cheers guys. I've ordered some standard wrap and a 25mm sleeve. I'll try it with the cable in both the sleeve and a piece of 22mm copper
pipe on the outside. Copper should conduct the heat away nicely.
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Sarah
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| posted on 29/10/24 at 06:22 PM |
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https://www.carbuilder.com/search?q=heat+sheild&options%5Bprefix%5D=last&type=product
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scudderfish
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| posted on 30/10/24 at 07:22 AM |
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quote:
Originally posted by JoelP
Cheers guys. I've ordered some standard wrap and a 25mm sleeve. I'll try it with the cable in both the sleeve and a piece of 22mm copper
pipe on the outside. Copper should conduct the heat away nicely.
The distance to conduct heat is much shorter through the wall of the pipe than its length though.
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MikeR
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| posted on 30/10/24 at 08:53 AM |
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Caterham have the same issue with some of the new models - i'd look what they've started to use after a spate of them breaking.
(it might not be Caterham themselves, but the aftermarket support companies adding this).
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cliftyhanger
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| posted on 30/10/24 at 12:16 PM |
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I would suggest heat shielding is going to give te "best" returns for effort. A simple bit of sheet ali on a bracket (or 2) attached to the
bellhousing may help significantly IF you can squeeze it in.
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JoelP
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| posted on 1/11/24 at 09:06 PM |
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quote:
Originally posted by scudderfish
quote:
Originally posted by JoelP
Cheers guys. I've ordered some standard wrap and a 25mm sleeve. I'll try it with the cable in both the sleeve and a piece of 22mm copper
pipe on the outside. Copper should conduct the heat away nicely.
The distance to conduct heat is much shorter through the wall of the pipe than its length though.
I've done it with a tubular wrap inside and outside of a 22mm pipe, as well as fresh wrap on the exhaust. I'm thinking that the copper will
spread any heat out quickly, rather than leaving a very hot spot at the point where it's closest. Time will tell though!
My new clutch cable is a few cms longer than the old one. Anyone know how you specify a longer one when sourcing, to avoid getting a random one?
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number-1
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| posted on 4/11/24 at 05:25 PM |
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I've used this before for wiring passing next to an exhaust and it worked well. Its not cheap but gives you an idea
linklink
[Edited on 4/11/24 by number-1]
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JoelP
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| posted on 4/11/24 at 06:06 PM |
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That looks excellent thanks! I'll try it if this one fails!
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number-1
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| posted on 4/11/24 at 06:58 PM |
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Is there a way to double up on the clutch cable? I had a pedal box that allowed for 2 cables to run to the throttle bodies as it was a twin webber
carb set up. Is this an option on your setup? As a back up in case one fails?
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JoelP
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| posted on 4/11/24 at 07:10 PM |
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It's pretty easy to change on the roadside anyway, so probably not worth the effort of a second.
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indykid
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| posted on 5/11/24 at 01:40 PM |
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If you can get a modest amount of airflow around it, a two layer sheet heatshield is very effective.
Just make sure the fixings between the shields are separated from the fixings to the heat source/sink, as in if the shield attaches to the hot
thing/cool thing in the centre, attach the outer shield at the edges to increase the conduction path, or offset the fixings half the spacing if on the
same pattern
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