Spitfire Spitfire Carbs

[tomkatb]

We just rebuilt our Spitfire 1500 engine and installed it. It now runs very well.

It has mild decking, high compression pistons, 74 exhaust manifold, Aluminum flywheel, 3-axis valve job, new stock cam, rebuilt crank, all new bearings, well balanced, and of course all new bearings. It runs very well however a little goofy from 1,000 rpm to 2,000. We used the original single Stromberg.

I think it needs more carb.

Opinions?

Dual 1.25 SU’s
Dual 1.5 SU’s
Webber something’s
New S.U. 1.75 for the single carb MG

Any opinions?

Larry

 

[tdskip]

Goofy as in???

I don't think I'd go with 1.25 SU, I've seen several cars with the larger 1.5 conversion/modifications. Check out https://www.triumphspitfire.com/carbs.html for more info.

 

[Paul Slice]

go with the HS4s or HIF4s with those engine modifications. Finding a 1.5 intake manifold for the 1500 at a decent price on this side of the pond will be the hardest obstical.


Paul

 

[tomkatb]

If I go with the su-4's how interchangable are the parts for connecting the carbs. Is the linkage from an MG the same?

 

[tomkatb]

Goofy-stumbles a bit. Kind of irritating. What is a sign of too lean?

The car runs well over 2000 rpm.

 

[Andrew Mace]

Dual HS4s were stock on the home market 1500s. Try Ted Schumacher @ TSI.

Spitfire/GT6 performance parts

Good price, and Ted will probably give you as much advice as you can stand! /ubbthreads/images/graemlins/smile.gif

 

[startech47]

Check the advance in the distributor. Phil

 

[tomkatb]

WOrked with the advance last week. Verified that the vacuum and centrifugal work correctly. Change the timing to less avanced.