Hey guys,

I currently have a Racing Beat and custom Holley (Weber power plates on the primaries) set up on my 6port 13b. I like the power it makes. Pulls like crazy but, there is the cutting out on hard left turns. It's driving me nuts when i go play in the canyons so......

Thinking about going weber now. Can any one point me to a good comparison thread or quickly tell me the merits of the IDA vs the side draft DCOE carb set up?

Which makes more power? Are there pros and cons to each? And i guess even more important, do they make as much power as the Holley? I basically liek to play in the so cal canyons. Not looking for a drag car or anything.

This motor is in a Datsun 510 with true dual exhaust. Mild porting on the engine. (unfortunately by previous owner so i can not say exactly how much porting)

Thanks,

Craig

 

Frankly, I think most of the difference between the IDA and DCOE setups are in terms of manifolding, at least as long as you're comparing similarily sized carbs. The "standard" IDA manifold has much shorter runners than the "standard" DCOE manifold that wraps around the top of the engine, so it's tuned to work better higher in the powerband. There's also the old lakes cities type of DCOE manifold that put the carb straight off towards the passenger side with even shorter runners, but they're hard to find.

Powerwise... I know a 48IDA can be setup to feed any 2-rotor up to the 300hp neighborhood and, aside from the manifolding thing I mentioned before, I don't see why the DCOE would be any different.

 

Hey! My old carb! Still sputters on left turns, huh? Go the IDA...I think Albert may have one available! I love mine...no hassles really, and it never sputters.

 

I have tried both the side draft 2 barrel and the down draft 2 barrel. The longer runners of the over-the-engine style side draft manifold made good strong torque on my streetport at 4000 rpm. When I went to the downdraft IDA carb, the torque moved up 4500 rpm. For a track only car, I would recommend the downdraft IDA. For a street car, I would recommend the side draft DCOE or Solex/Mikuni PHH just to have torque sooner. Both 2 barrel carbs have a bog if you crack the throttle too fast at too low of an rpm.
I think the ultimate street carb would be a Sterling modified Nikki 4 barrel.

 

Keep your mani and custom carb.

Racing Beat sells a "Race Float bowl" set up to eliminate the bogging in corners. It uses a center pivot in the bowl instead of a side pivot.

I'm sure with a little research, you could get the bowls much cheaper some were else if you find out the part numbers, or just talk with a carb shop experianced with Holly's and find the center style pivoted flaots.

http://racingbeat.com/resultset.asp?PartNumber=16641

~Mike...............

 

Weber 48 IDA and all those problems will be solve.

 

Dcoe normally works well for more mild apps,Ida is a little less forgiving not having a choke and so.(This only applicable to those of you who live where it snows...)

Karis

 

My REPU with stock 6-port and 48 DCO (no choke) never had problems starting in the winter when I lived in CO. 10 pumps then start without touching the gas, comes alive first time every time.

That said, the Weber isnt the most streetable carb in the world. Driving is fine when it is properly tuned but it really is touchy as the climate changes. It needs to be re-jetted at a minimum in the fall and spring. All last winter the REPU ran like ***, now that its 105+ out the thing is like a bat out of hell. I really wish I wasnt so lazy last winter.

I love the sound and the power it makes but I believe the Holley is a more forgiving carb on the street.