Dual down draft Carb selection for 2056 |
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Dual down draft Carb selection for 2056 |
technicalninja |
Feb 25 2023, 12:23 PM
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#1
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Senior Member Group: Members Posts: 1,348 Joined: 31-January 23 From: Granbury Texas Member No.: 27,135 Region Association: Southwest Region |
I'm looking at the Empi dual down draft carb kits and had a quick question regarding differences in the carbs themselves.
It looks like they have HPMX or Dual D carbs available. Which one would you choose? Should I lean towards real Webers or Dellotos? The intention here is to use the kit in its stock form initially and later change to port fuel injection using the carbs as throttle bodies much like MB911 is doing with his EFI conversion. http://www.914world.com/bbs2/index.php?showtopic=363246 Being able to remove everything in the bores is critical for me. No fixed boosters or venturis is a requirement. I'm planning on starting with an 8.5-9.0 compression 2056 with a webcam #86. I am planning on having the final engine as a 96mm bore/78mm stroke, but this will be in the future. I believe I should start with 44 mm carbs instead of 40. Suggestions, tips, and opinions would be greatly appreciated. |
technicalninja |
Feb 25 2023, 04:11 PM
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#2
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Senior Member Group: Members Posts: 1,348 Joined: 31-January 23 From: Granbury Texas Member No.: 27,135 Region Association: Southwest Region |
See what Venturi’s you can get off the shelf for 44mm webers. You can get a few sets (I would) as you plan for your future expansion goals. I don’t think you can get 48mm venturis small enough for a 2056. Anything can be made….but it’s just easier to stick with the product that still has support. https://www.cbperformance.com/product-p/6356.htm 44s = 32,34,36,38 40s = 32,34 The 44 are CNC machined in USA for everything except the 36 which is stock Weber. The CNC stuff looks better IMO and those are budget friendly. SuperHawk, thanks for the chart. Proves to me that the 40mm bores are at their max (34mm venturis) at 5500 rpm. Too small in my book. They'd work well with a stock 2.0 running sub-6000 rpm IMO. For what I'm building and future plans the 44s look like the way forward. By the time the big motor is in I will not be using the carbs for fuel. At that point a straight 44 mm bore will not add intake pumping loses until the rpm exceeds 7k |
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