Triumph twin su carbs

Honest John Back Room » Technical matters
View Threaded
Fri 2 Dec 2005 09:11
Triumph twin su carbs - tr2 implant
I have a hybrid '7 type' car. It has a Triumph 1200 chassis, 2 seater ali body and the engine is from a 1955 TR2 (TS6779F engine no.) The inlet manifold & carb have been modified and it now has a single carb, SU hif44, 1 3/4". This doesn't work well. I would like to revert back to the original twin 1 1/2" H4 SUs and have been offered some from a Spitfire. I wasn't sure whether they are 1 1/4" or 1 1/2". Does anyone know which size were used, or which other Triumphs used 1 1/2" carbs?
Reply | Report as offensive | Link
Fri 2 Dec 2005 10:03
Triumph twin su carbs - Collos25
Spitfire carbs are not big enough ,TR2's had a 2.2 4 cylinder engine the biggest spitfire was 1.5 .Try looking for pair from a vitesse six cylinder these should fit quite well.
Reply | Report as offensive | Link
Fri 2 Dec 2005 10:12
Triumph twin su carbs - Number_Cruncher
According to the Haynes SU book,

TR2 1991cc 4cylinders 1953-1955 2 x H4 carburettors, with FV needles and Red Springs.

If you find these difficult to come by, I would also consider using two HIF4 carbs from an MGB.

Number_Cruncher
Reply | Report as offensive | Link
Fri 2 Dec 2005 10:29
Triumph twin su carbs - Victorbox
Burlen Fuel Systems might be a good place to start for advice & bits www.burlen.co.uk/ They are the SU experts.
Reply | Report as offensive | Link
Fri 2 Dec 2005 10:57
Triumph twin su carbs - tr2 implant
I would confirm that the engine size is 1991cc, not 2.4. So what size/type were on the Spitfire?
Reply | Report as offensive | Link
Fri 2 Dec 2005 11:24
Triumph twin su carbs - Peter D
club.triumph.org.uk May be helpful. Regards Peter
Reply | Report as offensive | Link
Fri 2 Dec 2005 13:10
Triumph twin su carbs - cheddar
The Dolomite Sprint had twin 1&3/4" SU's though that also had 16v's and 6500 redline, I would have though that twin 1&1/2's would be fine for your application.
Reply | Report as offensive | Link
Fri 2 Dec 2005 15:20
Triumph twin su carbs - Number_Cruncher
According to the Haynes book, Spitfires used HS2s until the 1500, which used HS4s. It doesn't list what carbs were used on the Triumph Vitesse models though.

Hope that helps,

Number_Cruncher


Reply | Report as offensive | Link
Fri 2 Dec 2005 15:30
Triumph twin su carbs - tr2 implant
Thanx for that info Cruncher. Regards Dave
Reply | Report as offensive | Link
Fri 2 Dec 2005 19:04
Triumph twin su carbs - jc
Vitesses and a lot of other Triumphs used Strombergs.(Zenith vearible venturi carb).
Reply | Report as offensive | Link
Fri 2 Dec 2005 20:09
Triumph twin su carbs - autumnboy
Whatever Carbs are fitted from whatever vehicle with 1.5" carbs. The needles and springs would have to be sorted to suit the TR2 engine regardless whether the Vitesses or Sprints had 2ltr or not. As the engines are totally different.

There used to be a company who specialised with Triumphs 'SAH', try having a look in the 'Practical Classic Car Mag' or others which specialise in restorations.

Reply | Report as offensive | Link
Fri 2 Dec 2005 20:28
Triumph twin su carbs - bell boy
try rimmer brothers
Reply | Report as offensive | Link

If you cover no more than 100 miles per day and have easy access to a charging point at home or work, then an EV is ideal for you.

Is an electric car right for me?