Possibly resonance, you might be getting a node right around the jet
area. You could try a different trumpet and see what happens--anything
that changes the length of the intake should change the resonance of
the system.
another possibility is float bowl frothing induced by carb vibration,
or the float bouncing up and down.
One more reason I'd like to get rid of the SU's on the Ambro--I really
don't want to learn all about these carbs.
On Jul 10, 2008, at 6:41 AM, dale oesterle wrote:
> Folks: My 1296 pulls easily to 7000 rpm, slowing 90 hp on the
> chassis dyno and Fuel/Air at 13.0. At 7,000 I abruptly lose 20 hp
> and the fuel/air goes to 17. I get the same affect on 1 1/2 and 1
> 1/4 SUs. Any ideas? Dale Oesterle
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Bill Babcock
Babcock & Jenkins
Billb@bnj.com
503.936.7660
www.bnj.com
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