This forum is for topics and questions specifically related to the Mk III/Mk II variants.


Postby Alans 66 Sprite » Sun Jan 04, 2015 9:17 pm

The car I picked up has a down draft Weber carb on it. I have looked it up and down to see if I can identify it with no luck. I think it is a 32/36 style but have not taken it off to look inside. It has two small numbers stamped on the outside of the throats, (26) on one and (27) on the other ???
As I look inside and press the lever one side opens and then the other.
I also am wondering if it is the 32/36 has anyone had any experiance with them on a Sprite 1098 engine ? Is it worth having on there, are they any better that the stock SU's
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Postby admin » Tue Jan 27, 2015 4:31 pm

Might want to post some pictures to see if that might help identify...

Any carb, if set up properly, will work well. And there are many, many folks running Webers on their LBCs. Yet the key (especially with Webers) is to get them set up correctly, and that means the right jets throughout, and everything matched to the particular engine. But once set up, they are very nice carbs.

SUs are the same way--perhaps a bit more finicky to get "in sync" but again, once set up properly they run wonderfully.

I think in either case that folks replace the "bad" SU (or "bad" Weber) because it's old, worn or not set up properly. Just my $0.02.
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Postby Sprite33 » Wed Feb 04, 2015 7:49 pm

That sounds like the Webers (2) that I have on my 1970 2800 CS BMW with a 2.8L engine. That seems like a lot of carb for a 1098. Then again 32mm is about 1-1/4" . I ran 1-1/2" SUs on my race car for awhile and found it was not very good a low rpm. However, on the track where my rpm range from 5500 to 8000 it did well. I eventually went back to 1-1/4" SUs and opened the throttle plates to 34mm and got better performance on the track as well as better drivability in the paddock. I still think the 32/36 is too much carb for a street 1098 unless you plan to rev it pretty high. Just don't open the secondary unless you have the rpm up.
I can even bog down my 2.8L engine if I floor it at too low rpm.
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