I have been reading up on posts and the old Classic Inlines tech pages about carburetor conversions to improve upon the single-point, single-barrel stock carburetor. The consensus seems to be that a modified log head to accept a 2-barrel is the way to go, if the aluminum head isn’t an option.
I am wondering why I rarely if ever see anyone following Ak Miller’s footsteps and modify the log head to accept multiple variable Venturi sidedraft carburetors. I haven’t even seen a sidedraft intake on the aluminum head besides the ad banner for VI on this site. I am talking about CV carbs, not the race-oriented Weber sidedrafts.
As I see it, multiple sidedrafts have all the advantages:
-multiple points of discharge closer to cylinders
-constant velocity for proper atomization regardless of engine speed or load
-friendly to low hoodlines
-linear throttle actuation rather than staged (in the case of the Weber or any 4-barrel)
-easy to tune with needle adjustments
Is there a design advantage to using downdrafts? If not, why are they the near-universal choice?
I am wondering why I rarely if ever see anyone following Ak Miller’s footsteps and modify the log head to accept multiple variable Venturi sidedraft carburetors. I haven’t even seen a sidedraft intake on the aluminum head besides the ad banner for VI on this site. I am talking about CV carbs, not the race-oriented Weber sidedrafts.
As I see it, multiple sidedrafts have all the advantages:
-multiple points of discharge closer to cylinders
-constant velocity for proper atomization regardless of engine speed or load
-friendly to low hoodlines
-linear throttle actuation rather than staged (in the case of the Weber or any 4-barrel)
-easy to tune with needle adjustments
Is there a design advantage to using downdrafts? If not, why are they the near-universal choice?