dual weber from rotary enginnering
 

Guys i am thinking of buying a dual weber set up from a forum member
My question is what do you guys think is best for a bridgeport racing engine n/a, the dual weber or a 48 ida? thats my dilema, the dual will be cheaper than the ida so i wanna know what are my drawbacks as well. thanks guys

Well, honestly, i've got the weber and think nothing is better. But, supposedly on a Bridgeport a Double Pumper Holley carb will make more power. *shrugs* So, when i build my 13B 6-Port bridgy i'm going to put a Double pumper on it, but, already having a weber on my huge 12A street port i can tell you you cannot!, go wrong with one weber carb. I'm running a 48 IDF, i'd recommend a 44 IDF on a 12A bridgy and maybe a 48 IDF on a 13B bridgy, well, yah, a 48 IDF for sure. But, IDA's work good to. IDF's are more 'streetable' in my opinion, and just more convenient.. That's why i run one.

thanks for the info, yeah this car wont see the street so thats why i am going with the 48 ida. thanks again

The dual DCDs is the only way to go with a 1/2 BP. The DCDs are the only carb setup that has totally separate runners from the throttle plates to the combustion chamber. Net result is a 1/2sp-1/2bp will drive like an sp until the secondaries open up. By then, around 4k, the engine is well past that low end lag that 1/2bps produce.

As far as I'm concerned, there are no drawbacks. Even with a full bp, the DCDs develop higher intake velocities than any other carb/intake combo that has passages between the primary and secondary venturi to scavenge the supercharger effect.

When I had the Mikuni on the 1/2sp-1/2bp engine in the widebody, I had to drive in 2nd gear at 30 mph to prevent bucking/surging. 4th gear for any highway driving under 70-75 mph. Once I got the DCDs installed and tuned I could drive through town at 1500 rpm. That's 4th gear at 30 mph. 5th gear now produces smooth power from 45 mph on.

I can also get 24 mpg on the highway, as long as I keep my foot out of it, which isn't easy. It's just too tempting to open it up

but i am going full bridge and track only so i dont need it to be streetable. my concern is, which will be a better match for road racing, since you have tried them. Common sense tells me that the dcd would be better than the ida in the sense that they are progressive, when i go on low rpms for a slow corner for example being progressive they would produce a smoother powerband for more exit speed, on the contrary to the ida which is either power on or off and it produces max hp and power past 7k. is my common sense right?

IDA will give the most peak power up in the high RPM's, that's why pretty much ALL SCCA road racers in the GT3/GT2 class are running weber IDA carbs, whether it's on a 12A bridge port, or a 13B Periphial port.

yeah thats true but is my common sense right according to the dcd?, i am gonna go with the ida, that was my original intentions but since i saw the dcd for sale i wanted to know if they provided any advantage.