JJC Posted October 8, 2014 Report Share Posted October 8, 2014 There was a supercharged 2 at Castle Combe last Sunday (in the car park). I assume it is a well known car. I wondered just what the supercharger gives. In terms of net bhp, acceleration times, top speed? it's also the only other Derrington exhaust manifold I've seen (although it looks either modified or repaired) apart from ours. JJC Quote Link to post Share on other sites
Tr4Tony Posted October 11, 2014 Report Share Posted October 11, 2014 Hi About 35bhp in my experience in a 2138cc engine. So a better exhaust, cam, carbs and matched head gets you well over that to kick off, and is more reliable from my own personal experience, to the point that I sold my supercharger kit as it was a just a period vanity thing. Sounds very nice at full chat, but beware the strength if the bottom end if your engine if you grow to like that very pleasant racket. Regards Tony Quote Link to post Share on other sites
Alec Pringle Posted October 11, 2014 Report Share Posted October 11, 2014 At Castle Combe - good meeting, and with a healthy TR attendance too. This is one of the Fender Broad fleet . . . . . Cheers Alec Quote Link to post Share on other sites
Peter Cobbold Posted October 12, 2014 Report Share Posted October 12, 2014 (edited) Its FS as Alec says: http://www.fenderbroad.com/cars-for-sale/triumph-tr2-supercharged.html Seems it has been supercharged since 1957. Its a Shorrocks supercharger, quite capable fo 12psi boost without too much heat. From the blurb it seems Alan Allard supplied it. So the TR is part of UK supercharging history ! How much boost it gives depends upon the pulley ratio: cant tell from the photos. But those big drive belts suggest 10psi is not unrealistic. At 10psi boost the power gain over normally aspirated could be around 40-50%, with no increase at all in max rpm. Actual power depends upon how much the compression ratio has been reduced to keep knock within octane limits (lowers power) and if the head has been flowed (raises power). Dont be deceived by the single 2" SU, in this application its good for 200hp. The main point of supercharging is in torque gain across the entire rpm range, 1000rpm upwards. Compared with the other method of gaining that extra power - revs - the crank will be fine, here's why: ('route 3') http://gmr-uk.co.uk/engine-load-and-reliability I'd expect that to be a great road car, very driveable with all that low down torque. But NBG for competition as MSA effectively banned superchargers decades ago by imposing a 40% cubic capactiy penalty. Would be great to have it in the TRR. Peter Edited October 12, 2014 by Peter Cobbold Quote Link to post Share on other sites
Alec Pringle Posted October 12, 2014 Report Share Posted October 12, 2014 That is not the original s/c installation . . . . which I think was a Judson, if I understood Neil Fender's colleague correctly.. Cheers Alec Quote Link to post Share on other sites
EdwinTiben Posted October 12, 2014 Report Share Posted October 12, 2014 Concours Winning tr2 with judson on the Dutch National Triumph Day 2014 http://dntd.triumph.nl/sites/default/files/upload/dntd-2014/TR-A/TR-A(194).JPG Quote Link to post Share on other sites
stuart Posted October 12, 2014 Report Share Posted October 12, 2014 That is not the original s/c installation . . . . which I think was a Judson, if I understood Neil Fender's colleague correctly.. Cheers Alec Correct, that is a Cornish car from new and used to belong to a Doctor, he had the supercharger fitted. Stuart. Quote Link to post Share on other sites
Peter Cobbold Posted October 12, 2014 Report Share Posted October 12, 2014 (edited) That is not the original s/c installation . . . . which I think was a Judson, if I understood Neil Fender's colleague correctly.. Cheers Alec Arnott originally according to the sales blurb. ""1978 Dr Coombs replaced the Arnott blower with one bought from A.R.Allard - a Shorrock C142B."" Arnott is very smiilar in shape to that big Shorrocks and also a vane compressor. http://www.prewarcar.com/postwarclassic/magazine/previous-features/the-arnott-blower-mystery-015215.html Peter Edited October 12, 2014 by Peter Cobbold Quote Link to post Share on other sites
Peter Cobbold Posted October 12, 2014 Report Share Posted October 12, 2014 (edited) Concours Winning tr2 with judson on the Dutch National Triumph Day 2014 http://dntd.triumph.nl/sites/default/files/upload/dntd-2014/TR-A/TR-A(194).JPG Very neat - good to know non-originality is respected in the awards. Judson supplied a ready to bolt-on kit for TR2-3. Many must have survived, but dont appear in public very often. Peter The Eaton M62-based kit is the modern equivalent. Looks good too...well to me it does: http://www.mossmotors.com/Graphics/Products/Large/150-128_1.jpg Edited October 12, 2014 by Peter Cobbold Quote Link to post Share on other sites
JJC Posted October 12, 2014 Author Report Share Posted October 12, 2014 Well, many thanks for a great set of interesting and authorative replies. The Forum at it's best once again. Incidentally it was a great day at Castle Combe. Even better with a £5 reduction for "classic" drivers! JJC Quote Link to post Share on other sites
Alec Pringle Posted October 12, 2014 Report Share Posted October 12, 2014 (edited) Commendable little display of TRs from Brunel and Glavon, well done, and assorted other TRs scattered around the car parks. There were some older Triumphs in attendance Older members may remember Peter Campbell, a TR2 pilot of international renown back in the 70s, who these days is still competing but in the Wingfield Bristol Special The car that really did steal the show boasted cylinders each of larger capacity than a TR6 engine, and by some margin . . . . [/url] [/url] The intrepid pilot must have had balls the size of a respectable asteroid . . . . . Cheers Alec Edited October 12, 2014 by Alec Pringle Quote Link to post Share on other sites
JJC Posted October 13, 2014 Author Report Share Posted October 13, 2014 It looked to me like a bit of drifting! Fantastically good and brave driving! Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.