12a, dual SU carbs
02-16-03, 01:53 PM
#26
U sUx0rz @ THe IntaRwEB!
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Originally posted by 680RWHP12A
su carbs are good for a stock car, but for hi performance they suck!!!!! i had them on my 64 vovo!!!!! 1/" 3/4
and on my dads 59 austin healy bugeye, 1"
the webers are much better!
su carbs are good for a stock car, but for hi performance they suck!!!!! i had them on my 64 vovo!!!!! 1/" 3/4
and on my dads 59 austin healy bugeye, 1"
the webers are much better!
02-16-03, 02:09 PM
#28
Banned. I got OWNED!!!
Originally posted by White84SE
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.
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.
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!
02-16-03, 03:31 PM
#32
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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
--Danny
02-16-03, 05:18 PM
#33
Rollin' coal and 53mpg!
Re: su carbs
Originally posted by masterrigger
i have a 73 triumph tr6 with 2 su carbs / they are 1.75s. the motor is 2500cc. i think two would work on a 12a.
they are very easy to rebuild and all parts are available.
1.75 is inches / there are 24.5 mm in one inch (i think).
you do the math. the jet that the needle slides in will were out and make them run too rich. hope this is some help
i have a 73 triumph tr6 with 2 su carbs / they are 1.75s. the motor is 2500cc. i think two would work on a 12a.
they are very easy to rebuild and all parts are available.
1.75 is inches / there are 24.5 mm in one inch (i think).
you do the math. the jet that the needle slides in will were out and make them run too rich. hope this is some help
1 inch = 25.4mm
1.75" = 44.45mm
02-16-03, 07:14 PM
#35
Originally posted by White84SE
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
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
**** boy you got OWNED!
02-16-03, 09:42 PM
#36
Banned. I 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!
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!
02-17-03, 11:40 AM
#37
Yeah, shutup kid.
Thread Starter
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.
02-17-03, 06:03 PM
#39
Yeah, shutup kid.
Thread Starter
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.
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