- The response - It is an attempt to make a
large carburetor behave as though it were a smaller one
(at lower throttle speeds) and a smaller one behave like
a larger one (at higher throttle speeds).
-
- By making the bore oval (taller vertically) you are
able to give the carb increased air flow at the fully
open position and less flow at
- partially open positions. Since you didn't cut a
round hole in there, the stock slide will still cover the
throttle bore. Most carburetors can handle an increase in
bore in the neighborhood of 1 to 2 mm. If you can add
another mm vertically - you have gained something. Not
much - but you have gained some increased air flow.
-
- As far as whether this feeds the reeds or crankcase
any better... I would guess that perhaps it does at low
flow (1/4 to 1/2 throttle). But the margin must be very
close. If the actual calculated oval area is the same as
the actual calculated round area (of 2 different carbs),
there would be no detectable difference at moderate
throttle positions - therefore they would both be making
the same power. There may be an advantage below and above
this area to oval boring - if the engine is jetted
correctly.
-
- Rick
|
