Hello All,
I have been sorting out my new to me 74 with great success. It runs great but the carbs are going to need a rebuild in the not too distant future. Had a leaky float on 2 and a couple of stuck needles. Has anyone had any experience with the SU swap? I have read some on the Weber swap but seems pretty spendy. Thanks in advance.
David

 

Hello David,
There is really nothing wrong with Stromberg CD175s when they're in good order (particularly after a rebuild) and are correctly tuned. If you were going to depart from originality (swap with SU or Weber Carburetors), I would go the whole hog and fit EFI, and replace the distributor with Coil Packs.

Regards,

Brent

 

David,





My mechanic replaced my carbs for my 1971 E type V12III with new Rolls Royce carbs, it wasn't cheap but it runs great. If youreplace them be sure to save the old ones just incase you sell your Jag to a purist.

 

I have both the 74 v12 and a 76 silver shadow with the SU's. All need work after a while. Rebuild my RR SU's last year and found the floats were gasoline logged. The Jag carbs will work just as well once rebuilt. Fuel injection on the V12's, while done in specific cases, just not yet perfected yet. The usual conversion is to take from the later HE engines and transpose onto the Series III's.

 

Hello uras,
I've carried out quite a few conversions of SIII E's to fuel injection and its rather straight forward, with predictable and pleasing results. There is certainly no necessity to swap the engine with a HE version. Clearly there is a distinct fuel consumption advantage with the HE Engine, and is a worthwhile swap, but even then its the heads and pistons that need to be swapped, not the whole engine, particularly if retaining the original engine number is a criteria.

Regards,

Brent