Umm.. no.. SUs are good for hi-performance cars. The race car we sponsor runs SUs.. he could run Webers, but doesn't want the headaches associated with one, not to mention the fact it'd bump him up into a class where he wouldn't be competitive.. Webers may be better for ultimate topend power, but are much more difficult to tune for a street driven car.

 

SU's are also good for turbocharging

Elford Turbo RX7's came with SU's as did several other turbocharged cars in the UK

 

weber carbs are far superior to su carbs!!!
if you are in a class restricted from running webers then su's will work ok(grab the big ones off the early e-type jag) put some thin oil in the dashpots , grose needle valve and thats all you can do! no venturies, fuel jets , air jets, just a dashpot with a slide!

some common su to weber conversions

mini cooper 2 su's to a single weber
early volvo's 2 su's to single or dual weber setup
trimph tr3, tr4, tr7, spitfire all have su carbs weber conversions for all models (avail. single or dual weber converions)
all austin healy's came with su's but have weber conversions!

there are many more but the point is to upgrade your carb, not downgrade!!!!webers are superior hi performance carbs in every aspect!! but su carbs will work, just not as good!

 

*says the guy who sells Weber carbs*

 

* says the guy that has tried all of them!*

 

Ok ok... it's just hard not to observe a certain incentive on your part to say stuff like that!

 

LMAO I've seen quite a few British cars come through that have Weber cars replacing the factory carbs, and ya know what? I've yet to see a Weber setup that is anywhere near as livable in every day driving when compared to a SU or Stromberg setup. As I said, topend power, yes, the Weber will usually win, mainly because of the fact it's bores are larger and can flow more air. And as far as not replacing fuel jets, what the hell are you talking about? Obviously you didn't know that you can buy different needles for them, which is what changes the jet size. The Grose valve you refer to has nothing to do with all out power, as it's is simply a way to ensure the valve into the flowbowl will not stick open. Most of the guys who race these cars run NO fluid in the dashpot, and the dashpot is PART of the slide. Please, if you're going to argue about something, get a clue...

--Danny

 

1 inch = 25.4mm


1.75" = 44.45mm

 

How many CFM's are these carbs? Anyone know.

 

**** boy you got OWNED!

 

sorry im a little rusty on my knowledge on SU carbs from the 50's ,and 60's that are not my specialty!! he busted me, i will admit it!!!but, you bring your mazda with SU carbs, and i will bring my mazda with a weber, and we will see wich one makes more power, im very confident the winner eill be a weber! ANYDAY!

p/s anytime i ever changed the needle you spoke of the car ran like ****!(must have done something wrong)and when my oil leaked out of the dashpot(it was bad) the car ran like **** also!

 

Well, when I eventually get these onto my car, I'll let you guys know how they perform. I doubt it will be much better than stock until I get a RB header and presilencer on there, but these carbs were at the right price, and I couldn't pass them up.

 

Yes. It's TWO single barrel carbs. Sorta like a two barrel carb.

-bp-

 

Thanks, I get that now. I wasn't sure on how webers were rated, if a 48mm was 2x48mm, or 48mm total. But I knew these were 44.5mm each. They will defiantly flow enough for a stock port.

 

Do they come with a manifold? How is the OMP plumbed in?

Dan

 

i used to have twin strombergs sucking through a t4 turbo. It was a crude little set up but it worked a treat. I have some pics of it somewhere.