>  Ken Welter wrote:

  Jepson you are right with what you say about the rich rough running
  at the low end and I would not consider running one on a car but none
  of that matters on an airplane, it runs fine on the mid and upper end
  where you fly, I have 1100 hrs flying on a Weber and it work fine and
  it is just to simple to hookup a fuel line and throttle cable and go
  fly.

  Ken Welter

 In defense of the mighty Webber, they were original equipment on the finest
 most expensive automobiles built in Italy. They are fully
adjustable from idle
 to full flow.
 They perform perfectly even when the choke size is within 4 MM of the
 butterfly size.
 Mr. Drummond says he can get within 6 HP of fuel injection in the 250HP
 range.
 When the sanctioning organization is controlling performance with
choke size,
 then there are modifications required to improve fuel flow at very high flow
 rates (9,500 RPM). So we have one Webber where there should be two Webbers.

 Don't tell an Italian mechanic "you wouldn't use one on a car."
And certainly
 not if he has a wrench in his hand.

 Set up your jetting with the fuel pressure at 6.5 pounds and a Gross jet
 needle seat. Then adjust fuel pressure down to 1.5 pounds for a
good range of
 leaning mixture.
 Lynn Hanover

    The 48mm that I am running now is a lot better on the low end then
the 51mm I was running and I think that the 45 may be a lot better on
the low end and may be a better choice for the street.

  To get proper fuel flow I throw out the screen on top out the needle
and seat and I drill out all the passages from the fuel line and the
needle and seat, I also have two fuel pumps, one pump is set at 7 psi
and the other is set at 3 psi, I takeoff with both pumps on then shut
off the 7 psi pump for cruise.

  I have tried the gross jet but had problems with it sticking in the
closed position, luckily it was on the ground while running down the
taxi way.
  The gross valve is a ball that seats in the seat instead of a needle
and the size of hole in the seat is very close to the size of the
ball and the ball got stuck in the seating hole.

   Ken Welter

 
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