rvwp Posted December 10, 2019 Report Share Posted December 10, 2019 Hi guys, Has any one used a heat shield mounted between the inlet manifold above the exhaust manifold to reduce heat transferring to the HS6 carbs on a TR4a? I remember a heat shield being standard on a similar set HS6 set up om my MGA Twin cam previously owned. ( see Moss MGA catalogue). Seems like it would be pretty easy to make subject to acquiring suitable asbestos free sheeting to back up an steel/alloy plate sandwiched between the inlet manifold and the carbs. Is the heat a problem anyway? Any comments would be appreciated Quote Link to post Share on other sites
RogerH Posted December 10, 2019 Report Share Posted December 10, 2019 Hi Rich, my 4A HS6 carbs rarely get anywhere near needing anything to keep the heat away. The only occasions are in stand still/slow TRaffic for a prolonged time and then it clears quickly once moving. The heat shield may give more inconvenience than a help. Roger Quote Link to post Share on other sites
Z320 Posted December 10, 2019 Report Share Posted December 10, 2019 No need at all for that - in my opinion. Sorry if you are disappointed.... Quote Link to post Share on other sites
ianc Posted December 10, 2019 Report Share Posted December 10, 2019 Heat is a problem when a 4-branch, steel, exhaust manifold is used in place of the standard cast iron lump. However, trying to fit and fix a heat shield in place is quite a challenge, which is why I've never done it! Ian Cornish Quote Link to post Share on other sites
james christie Posted December 10, 2019 Report Share Posted December 10, 2019 Probably better to wrap the exhaust - which is what I have done, more to protect the alternator, but the wrapping material don't come cheap!! james Quote Link to post Share on other sites
Fireman049 Posted December 10, 2019 Report Share Posted December 10, 2019 (edited) . Edited April 15, 2020 by Fireman049 Quote Link to post Share on other sites
AndyR100 Posted December 10, 2019 Report Share Posted December 10, 2019 I bought a couple of s/steel ones off eBay, they fit fine and only get in the way occasionally. ...... Andy Quote Link to post Share on other sites
Z320 Posted December 10, 2019 Report Share Posted December 10, 2019 (edited) 5 hours ago, rvwp said: Hi guys, ... Is the heat a problem anyway? Do you have a real problem? If not...than why worry? I like that guy, perhaps you can stop watching at 0:35 Edited December 10, 2019 by Z320 Quote Link to post Share on other sites
rvwp Posted December 11, 2019 Author Report Share Posted December 11, 2019 Great response, thanks. Was just asking, No need for a heatshield then, so won't go down that route. Rich Quote Link to post Share on other sites
Z320 Posted December 11, 2019 Report Share Posted December 11, 2019 (edited) If you touch the carbs ANY time - they are cold by the vaporizing petrol as long as the engine runs. If you stop the engine they become "warm" by the engine heat, but have been so cold before, so they are never hot. If the petrol would boil the SUs are so extreme simple - (no idel jet) - the unlikely vaporized petrol can't be trapped anywhere. So - then why worry? edit: BTW, I have "anti run on" - valves below both SU HS6, this also without heat shield and without any problems Edited December 11, 2019 by Z320 Quote Link to post Share on other sites
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