Big Block Drift Truck - Pic Heavy

[Uncle Gump]

Well if one of your four carbs goes out of sync or craps out... you loose three cylinders.

There are some unknowns too with your plenum... reversion... fuel stand off... etc...

I've had good luck with webers on inline 4 cylinders. One barrel per cylinder... straight flow... lots of parts for tuning including venturis and even blow through parts available.

Whatever you choose... I'm pulling for ya. It's a cool ass project!

 

[bobbywalter]

that stetup is the best looking one in my opnion. the only reason im deciding to go with 4 smaller carburators ( 2 per 3 cylinders) is that if one of the webbers goes out of tune or craps out, 2 cylinders are affected. if that makes sense.

here is example of how i think of it.

3 carbs = 600cfm total
3carbs - 1 carb =400cfm

VS

4 carbs = 600cfm total
4 carbs - 1 carb = 450cfm

and the loss of cfm is distributed between 3 cylinders insted of 2


Here is the design im going with.

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2 1 bbl carbs would probably be too much. but i can see it actually working very well in the stock hp configuration and cam/valve event profile biased to port efi....

the size per cylinder and actual stroke combined with the short runner is not the ideal.

the steady operation throughout the rpm range is hard to do.


so 2 1bbl i would wager with a distribution plate/cone under a bolt on mount would be pushing it....let alone 4 carbs.

its not a radical cam high compression high flow engine. the intake is only good for higher rpm in this configuration. idle to 1600 might be shitty...


might work great....might not.

 

[SenorNoob]

Roughly 50 CI per cylinder. About 100 CI 2 cylinder on Harley engines is common. What do they use for carbs? I get that people work with what they now. And I certainly appreciate a good carb engine, but I'd have used fuel injection IF stock like power and RPM range...