Thread: Carb question

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By either of the two formulas given to determine carb size this would be an under sized carb. Given that, would there be sufficient vacuum to pull fuel and atomize it properly?

Yes it will work just as a Stromberg 97 would work if you could mount it, but in my opinion drive ability will be adversely affected.

This is really a very special purpose carb. There's some tuning required to make it run well on a track and it appears to be very specifically designed for racing applications where the engine spends a lot of time at high RPM. See the tech advice on their web site.

http://www.vdlfuelsystems.com/80507_390_tech.htm

If you already have the carb, you can always try it and if it doesn't work, put a more conventional carb (600 cfm Edelbrock or Holley or a 750 cfm QJ).

Let us know what you end up with.

Regards,
Glenn

I've read the tech article and I have the carb, it was a freebe....It came off the race car because it failed tech inspection, the car ran great with it so I know it works. I currently have an Edelbrock 1405 and I don't like it at all. So if the VDL carb will work I'll use it....If not, It's time to buy something else. My big issue is time, I don't have a lot of it to mess around with something that is just not going to work.

I have had really good luck with the 1406 electric choke Edelbrock on 305-400 small blocks with mild performance enhancements. The 1405 works well in very warm climates. Also, the Edelbrocks, in general, tend toward the rich side out of the box and need to be tuned a bit. Fortunately, Edelbrock makes this very easy. Jets, metering rods and a gasket run about $20.

I'll be curious to hear how the 390 cfm works out for you. I think you may find it a bit small for low RPM but it will be fantastic on the freeway or at higher speeds.

Have Fun,
Glenn

I guess I'll try it out, nothing to lose but time I guess....
With the Edelbrock I have a flat spot off the line. I've tried everything I can think of jets, metering rods, squirters, springs. Went through the manual over and over, no matter what I do it has the same flat spot. It does seem to get worse when it's cold though. You get what you pay for, the Edelbrock was cheap....

It could be just the idle adjustment and proper positioning of the throttle plates which cause a stumble under light acceleration. Or your float could be to low causing a loss of fuel under hard acceleration from a dead stop.