Richardtr3a Posted July 9, 2018 Report Share Posted July 9, 2018 A very hot spell leads me to wish the 3A would do better mpg. It went to a local sports car garage and the SU tuner had his own way for the adjustment of the needles in the SU H6. It ran very smoothly and off to Lincoln and back. The roads are rough, crowded and the M11 north of junction 14 was a huge building plot with a 1 hour traffic jam.At the show my friend balanced the two carbs with a Gunson balancing tool and then checked the mixture with 4x colortunes. On the return journey we are over 30mpg. Rest days before setting off for CLM The son-in-law cancelled at the last moment so drive alone from Lewes to Portsmouth, meet the friends and ferry across the channel to Caen, Quiet drive to Le Mans on beautiful empty roads without traffic or potholes.. On arrival the s-i-l calls to confirm a late start and an independent journey to Portsmouth and then Caen. So erect the tent and back up north to collect him and drive down a second time. This time I find the entrance first time. England win the match and the new inflatable bed works first time. fabulous race cars and lots of French registered Triumph cars. An excellent two days with amazing cars and atmosphere. Set off on Sunday lunchtime to drive to Dieppe for a booked crossing to Newhaven and home early !!! Caught the ferry and arrived in Newhaven about 50 yrds from the dock.when we are informed that something on the landside ramp is broken and we have to turn around and have to return to Dieppe. Arrive back and leave immediately for Calais to Dover ferry. Check in at 03.59 ,leave at 04.15 and back home by 08.30. In all a 20 hour trip and crossed the channel three times in one journey.. The car runs very well but did get hot once. Why does the tick over need adjusting after a very hot traffic queue for the boat ? Back in the garden the engine is smooth and there is no need to adjust the carbs any more. A mileage check every time we fill up gives some good figures. One fill of French best giving high thirties for casual cruising. So, tune it x2, drive just under 1,500 miles in a week and the car is running very well and reliable hot starting. The owner is totally worn out. Triumph wins again Quote Link to post Share on other sites
Lebro Posted July 10, 2018 Report Share Posted July 10, 2018 Glad it all worked out OK Richard. The tickover gets slow when stuck in traffic because the under bonnet temperatures get much higher than normal, & so the carbs are drawing in hot, less dense air, & the mixture get richer. Mine does the same as do most other TR's. The solution is to provide a source of colder air from in front of the rad. Something on my "to do when I get round to it" list. I averaged 38MPG this year on the Leatherhead - Lincoln round trip not bad considering the M25 was a car park on the way up ! Glad you enjoyed Le Mans must go sometime. Bob. Quote Link to post Share on other sites
Hamish Posted July 10, 2018 Report Share Posted July 10, 2018 Bob I swapped my radiator this year ( like for like except no starter hole) and decided to add a carb cool air feed. I did have to cut the fibreboard cowl tho ! Its been so hot this year tho I presume it makes a difference (esp when moving) H I was going to up load some pics for you but I get this message You can upload up to Uploading is not allowed of files (Max. single file size: 32MB) Doesnt appear to be a sizing issue. As it just says - is not allowed- I always could before off my iphone :-( Quote Link to post Share on other sites
monty Posted July 10, 2018 Report Share Posted July 10, 2018 Hi Richard, Lebro is correct, tick over appears to get slower or erratic on both my cars cars one with SU's & the other with Webers, in my experience. Even with an electric fan they seem to get 'lumpy' in traffic, especially in hot weather. I also have a air inlet to the Webers but they still do not like slow traffic very much. Cheers. Quote Link to post Share on other sites
Fireman049 Posted July 10, 2018 Report Share Posted July 10, 2018 Here's my set-up for providing cold air to the carbs. My air duct is made of aluminium. The cold air TRunking opening is at the top left. Tom. Quote Link to post Share on other sites
Nigel A Posted July 10, 2018 Report Share Posted July 10, 2018 Hi Richard They still hadn’t fixed the ramp yesterday, but luckily they sent us straight up to Calais. A nightmare 3 hour trip home from Dover - part of the M20 closed and lots of roadworks on M25 Glad you had a good time though Cheers Nigel Quote Link to post Share on other sites
RogerH Posted July 10, 2018 Report Share Posted July 10, 2018 I was going to up load some pics for you but I get this message You can upload up to Uploading is not allowed of files (Max. single file size: 32MB) Doesnt appear to be a sizing issue. As it just says - is not allowed- I always could before off my iphone :-( Hi Hamish, keep your pic size to about 100Kb and it should well. Roger Quote Link to post Share on other sites
peejay4A Posted July 11, 2018 Report Share Posted July 11, 2018 Unfortunately when you are in traffic the cold air feed stops working. I get the slowing down in traffic too even with the cold air feed. I wonder if a 12v computer fan in the trunking would work. Quote Link to post Share on other sites
Lebro Posted July 11, 2018 Report Share Posted July 11, 2018 Ben Freer has done this, we must ask him if it worked Bob Quote Link to post Share on other sites
RogerH Posted July 11, 2018 Report Share Posted July 11, 2018 Hi Bob, Ben used a fancy inline fan with some nice ducting. I bought the same but haven't fitted it yet. Can't remember where I got it from. I thought it may be Merlin Motorsport but their site doesn't show it. Roger Quote Link to post Share on other sites
Ben Freer Posted July 11, 2018 Report Share Posted July 11, 2018 Yes Roger, I was typing this (and taking pictures as you posted!) I have installed a 3" fan and trunking to Geoffrey following our vaporisation issues last summer on the Paris-Prague. I got the fan (I call it the "bilge pump" - but infact it is a ventilation fan for bilges.) Anyway I was going to get the Revotec version but the nice man at Merlin Motorsport demonstrated that the cheaper, plastic version actually huffed considerably more air. I have it direct wired (fused) to a switch under the dash which I operate when we are in a queue. No grumpy, lumpy tickover in stationary traffic anymore! The fan is mounted on a bracket on the inside of the airduct infront of the radiator (Yes, you can see it if you peer behind the grill). The other end of the duct wafts cooler air over the carburettors very effectively. , , Quote Link to post Share on other sites
Guest Posted July 11, 2018 Report Share Posted July 11, 2018 (edited) Yes Roger, I was typing this (and taking pictures as you posted!) I have installed a 3" fan and trunking to Geoffrey following our vaporisation issues last summer on the Paris-Prague. I got the fan (I call it the "bilge pump" - but infact it is a ventilation fan for bilges.) Anyway I was going to get the Revotec version but the nice man at Merlin Motorsport demonstrated that the cheaper, plastic version actually huffed considerably more air. I have it direct wired (fused) to a switch under the dash which I operate when we are in a queue. No grumpy, lumpy tickover in stationary traffic anymore! The fan is mounted on a bracket on the inside of the airduct infront of the radiator (Yes, you can see it if you peer behind the grill). The other end of the duct wafts cooler air over the carburettors very effectively. WP_20180710_09_27_17_Pro.jpg, WP_20180710_09_26_17_Pro.jpg, WP_20180710_09_25_51_Pro.jpg I've seen a similar set up on a TR here in Holland. Clever solution. I can't find a pic, but yours is exactly what I wanted to show. Edited July 11, 2018 by Menno van Rij 2 Quote Link to post Share on other sites
Lebro Posted July 11, 2018 Report Share Posted July 11, 2018 (edited) Hi Bob, Ben used a fancy inline fan with some nice ducting. I bought the same but haven't fitted it yet. Can't remember where I got it from. I thought it may be Merlin Motorsport but their site doesn't show it. Roger https://www.merlinmotorsport.co.uk/p/3-inch-76mm-diameter-in-line-blower-fan-cwp140 This the one ? Bob. P.S. Just ordered one, plus some expensive ducting I intend to wire mine to come on at the same time as the Revotech fan Edited July 11, 2018 by Lebro Quote Link to post Share on other sites
RogerH Posted July 11, 2018 Report Share Posted July 11, 2018 That's it.. Roger Quote Link to post Share on other sites
Ben Freer Posted July 11, 2018 Report Share Posted July 11, 2018 https://www.merlinmotorsport.co.uk/p/3-inch-76mm-diameter-in-line-blower-fan-cwp140 This the one ? Bob. Yes, that's the baby! I bought 1m of duct which is plenty and a large jubilee clip Quote Link to post Share on other sites
Tony_C Posted July 12, 2018 Report Share Posted July 12, 2018 Hello Richard, would / could you recommend the garage that sorted your carbs? Quote Link to post Share on other sites
John McCormack Posted July 13, 2018 Report Share Posted July 13, 2018 (edited) My TR2 is a daily driver and club car. If they get used all the time they just keep going. We obviously get pretty hot down here and the idle suffers. Warm in normal use she idles steadily at 800rpm, when hot say after a long high speed drive the idle is a bit lumpy and down to 700rpm. On the really hot days, over 40degC, she gets very lumpy and idle drops to 600rpm. Nothing to do for it on those +40degC days but blip the throttle at the lights/in traffic. Edited July 13, 2018 by John McCormack Quote Link to post Share on other sites
tim hunt Posted July 14, 2018 Report Share Posted July 14, 2018 When slowing to a halt after a long hot run I have got in the habit of pulling the 4A choke out by 1/4", this gives the required rise in idle speed without any actual mixture enrichment. Tim Quote Link to post Share on other sites
Lebro Posted July 15, 2018 Report Share Posted July 15, 2018 Yes Roger, I was typing this (and taking pictures as you posted!) I have installed a 3" fan and trunking to Geoffrey following our vaporisation issues last summer on the Paris-Prague. I got the fan (I call it the "bilge pump" - but infact it is a ventilation fan for bilges.) Anyway I was going to get the Revotec version but the nice man at Merlin Motorsport demonstrated that the cheaper, plastic version actually huffed considerably more air. I have it direct wired (fused) to a switch under the dash which I operate when we are in a queue. No grumpy, lumpy tickover in stationary traffic anymore! The fan is mounted on a bracket on the inside of the airduct infront of the radiator (Yes, you can see it if you peer behind the grill). The other end of the duct wafts cooler air over the carburettors very effectively. WP_20180710_09_27_17_Pro.jpg, WP_20180710_09_26_17_Pro.jpg, WP_20180710_09_25_51_Pro.jpg Just finished installing mine, a differant approach to Ben as I think my front metalwork is different. my fan is strapped to the horn, with flex ducting going forward & rearward. Seems to produce quite a draft ! Bob. Quote Link to post Share on other sites
TR NIALL Posted July 15, 2018 Report Share Posted July 15, 2018 Just finished installing mine, a differant approach to Ben as I think my front metalwork is different. my fan is strapped to the horn, with flex ducting going forward & rearward. Seems to produce quite a draft ! 20180715_111937.jpg 20180715_111951.jpg 20180715_112008.jpg 20180715_112228.jpg Bob. Hi Bob,any alterations to the Carbs using that Setup? Quote Link to post Share on other sites
Ben Freer Posted July 15, 2018 Report Share Posted July 15, 2018 Nice one Bob; more than one way to skin a cat! My apron has a inner flange/duct that I fixed the fan to but I can see some logic in moving the fan inboard as you have done to protect it from the elements. I have no horns (another molestation that Geoffrey has endured over the years!) to conveniently attach the fan to in the position you have used. Quote Link to post Share on other sites
Lebro Posted July 15, 2018 Report Share Posted July 15, 2018 I may do a more permanant attachment in due course, but this is quite solid, & will do for now to see how well it works. 1st test will be Wednesday when I will be down at the Amberley Chalk Pit museum, bound to hit some traffic on the way. Bob. Quote Link to post Share on other sites
anotheralan Posted July 15, 2018 Report Share Posted July 15, 2018 Just finished installing mine, a differant approach to Ben as I think my front metalwork is different. my fan is strapped to the horn, with flex ducting going forward & rearward. Seems to produce quite a draft ! 20180715_111937.jpg 20180715_111951.jpg 20180715_112008.jpg 20180715_112228.jpg Bob. gNot surprised its drafty. 3.8m3/min is all the air needed for running at 3800rpm on a 2lt engine. Isn't it? Tick-overkill? perhaps divert some to the footwell for those heatwaves. Quote Link to post Share on other sites
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