Keith Scotch Posted June 11, 2023 Report Share Posted June 11, 2023 Took the GT6 on a long run today to Silverstone. This was the longest drive I've done since buying the car. It was a very hot day but I was concerned at how hot the metal part of the gear knob became. Is this normal or could there be an issue I need to look at? Thanks Link to comment Share on other sites More sharing options...
johny Posted June 11, 2023 Report Share Posted June 11, 2023 Pretty normal as the box gets hot after long drives and of course the exhaust runs through that area as well. The biggest problem is stopping the heat coming through to the cabin.... The last of the spitfires used a single rail gearbox whose lever had a thermal insulator incorporated to stop the exact problem youve found! Link to comment Share on other sites More sharing options...
Nigel Clark Posted June 11, 2023 Report Share Posted June 11, 2023 Yes, normal in my experience. Nigel Link to comment Share on other sites More sharing options...
dougbgt6 Posted June 11, 2023 Report Share Posted June 11, 2023 (edited) Yup, normal for a GT6. You can always tell the GT6 drivers, they're the ones in shorts. Doug Edited June 11, 2023 by dougbgt6 Link to comment Share on other sites More sharing options...
Pete Lewis Posted June 12, 2023 Report Share Posted June 12, 2023 as everything takes on the heat from lost and waste efficiency anything and everything will fry eggs and get too hot to touch yes its very normal Pete Link to comment Share on other sites More sharing options...
johny Posted June 12, 2023 Report Share Posted June 12, 2023 If a real issue can only suggest some type of heat resistant sleeving on gear lever.... 1 Link to comment Share on other sites More sharing options...
JohnD Posted June 12, 2023 Report Share Posted June 12, 2023 (edited) All that heat, but ALL of it, is from the engine, via the radiator. No internal combustion engine is more than 50% efficient, ours are a lot less and most of that wasted energy comes out as heat. WE dump it into the air via the radiator and of course it all flows under the car and around the transmission tunnel and gear box. This was proved to me by my experimental "Silverback" car, that had a radiator in the back. It was a rather cold car to drive! Not a solution for a GT6, but better air extraction from the under bonnet might help. Possibly - never done it! - some barrier to air flow into the gearbox cover and transmission tunnel? John Edited June 12, 2023 by JohnD 1 Link to comment Share on other sites More sharing options...
Keith Scotch Posted June 12, 2023 Author Report Share Posted June 12, 2023 Thanks for your reassurance guys. I'll wear less clothing! Link to comment Share on other sites More sharing options...
johny Posted June 12, 2023 Report Share Posted June 12, 2023 Of course the standard ball gear knob, if fitted, doesnt help as its pretty small and solid. I have a large plastic perforated leather cloth covered jobbie and thats much more comfortable... Link to comment Share on other sites More sharing options...
Chris A Posted June 12, 2023 Report Share Posted June 12, 2023 1 hour ago, Keith Scotch said: Thanks for your reassurance guys. I'll wear less clothing! Why do you think it is called a GT6? Gas Temperature(ok mark) 6 2 Link to comment Share on other sites More sharing options...
Dick Twitchen Posted June 12, 2023 Report Share Posted June 12, 2023 21 hours ago, dougbgt6 said: normal for a GT6. You can always tell the GT6 drivers, they're the ones in shorts. Totally agree, 45C in mine to/from Silverstone; but do not wear shorts under any circumstances (tunnel heat!). Dick Link to comment Share on other sites More sharing options...
dougbgt6 Posted June 12, 2023 Report Share Posted June 12, 2023 Dick, I lined the tunnel with Silent Coat, sealed the base and the bulkhead, So I could were shorts if I were that way inclined. Doug Link to comment Share on other sites More sharing options...
johny Posted June 12, 2023 Report Share Posted June 12, 2023 Wow sounds like you should all get a proper car like a Vitesse and then you can drive with clothes on😂 Link to comment Share on other sites More sharing options...
dougbgt6 Posted June 12, 2023 Report Share Posted June 12, 2023 Where's the fun in that? Doug Link to comment Share on other sites More sharing options...
johny Posted June 12, 2023 Report Share Posted June 12, 2023 Ha ha, each to their own I suppose! Link to comment Share on other sites More sharing options...
JohnD Posted June 13, 2023 Report Share Posted June 13, 2023 On air extraction, those bonnet wing ports on the LeMans Spitfires are more or less "Meh"! They do not extract! A less elaborate and better designed extractor vent induces a vortex in the mouth of the vent which should be enclosed with an angle floor. The vortex energises the air in the mouth which then is pulled out of the back of the vent. May I, modestly, refer you to the vents that my Old Blue had? The lip on the front edge of the vent is important! Internally it looks like this experimental model, which shows how the ducting behind the hole makes it much more effective - the tufts move OUT not just back in the breeze from the airgun. John 1 Link to comment Share on other sites More sharing options...
Iain T Posted June 13, 2023 Report Share Posted June 13, 2023 When I raced a Jaguar mk2 I had the bonnet on 4 pins for easy removal and access. I had the back raised a good inch or more to let hot air out. Not possible on our cars as it would spoil the lines. Another option is to remove the bonnet/bulkhead seal but then you'll die of fumes..... I'm having a problem with fumes in my Vitesse! Iain Link to comment Share on other sites More sharing options...
JohnD Posted June 13, 2023 Report Share Posted June 13, 2023 Did that really work, Iain? On most cars, including the Jag, the rear of the bonnet is close to the lower edge of the windscreen, and so there is a pocket of high pressure there. I presume that Jaguar knew this - Triumph did as that is where the intake for the internal air ventilation is sited. John Link to comment Share on other sites More sharing options...
Iain T Posted June 13, 2023 Report Share Posted June 13, 2023 42 minutes ago, JohnD said: Did that really work, Iain? Probably not John! As you say the air pressure is positive not negative. In my defence in the early 80s a lot of the JDC pre 68 racing saloons opted for a raised bonnet rear. As soon as I finished a race the bonnet came off to the smell of hot engine and hotter brakes. That smell still lingers in my nasal memory! So the only time it had any effect was the minute or so of panic at the start line.....😳. I did also let louvres in the bonnet a la Coombes specials. As you know once off the grid the sounds and smells take over and it's only on a straight I glanced at oil and water temp or the big orange oil pressure lamp! Iain Link to comment Share on other sites More sharing options...
JohnD Posted June 13, 2023 Report Share Posted June 13, 2023 I always say that unless you are Hamilton or Fangio, you win the race in the workshop! But I'm sorry to burst the Coombs bubble - louvres look the business - but are, again, lousy extractors! The first is OK, but it has a very small area. The next is working in turbulent air, the one after that even more so, so that after that they don't extract at all! Bests, John Link to comment Share on other sites More sharing options...
Iain T Posted June 13, 2023 Report Share Posted June 13, 2023 (edited) 17 minutes ago, JohnD said: But I'm sorry to burst the Coombs bubble - louvres look the business - but are, again, lousy extractors Again we now know they don't work for racing cars but in normal road stop start driving they do let out heat. Saying that I'm not a fan as they also let water in when stationary! Iain Edited June 13, 2023 by Iain T Link to comment Share on other sites More sharing options...
JohnD Posted June 13, 2023 Report Share Posted June 13, 2023 Try a side vent, as above! Link to comment Share on other sites More sharing options...
Iain T Posted June 13, 2023 Report Share Posted June 13, 2023 My racing days long gone as has the jaguar. I did a few races and hill climbs in my TR3A in the late 80s and Monty Challenge in 2000 then retired as work took over. I've tried to post photos but it won't work! Iain Link to comment Share on other sites More sharing options...
JohnD Posted June 13, 2023 Report Share Posted June 13, 2023 I'd love to see your pics, Iain! Please try again? What's the problem? John Link to comment Share on other sites More sharing options...
Iain T Posted June 13, 2023 Report Share Posted June 13, 2023 (edited) It says unable to complete due to low memory. It's a common problem for me. I've cleaned up including history and have plenty of memory. Iain Me on the right Head gasket blew on day one of five on Monty. Changed overnight but it blew the rear seal so it was like the Torrey Canyon all the way there and back! No photos of the TR3A but it was also red. Edited June 13, 2023 by Iain T Link to comment Share on other sites More sharing options...
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