PMO Carb Float Level Adjustment Advice Needed

[EWPurdy]

Float level is adjusted by bending the metal tab as decribed on the instruction sheet. Mine are all pretty darn close now. I also had way too much pressure as my original pressure gauge was out to lunch. With the pressure at 3.5, and the levels adjusted correctly things are just about right. I'm still trying to track down the cause of a miss when I get on the gas hard after a high g corner or when I accelerate at full throttle in a straight line and get to 5K RPM. I suspect many things could cause this but I'm going to wait until I replace my aging CIS pump with some low pressure variant to get serious about finding it.

[RoninLB]

my situation

after each carb was was air balanced and idle balanced etc with the cross bar attached the higher rpm balance was a bit of a pia. I has to adjust the the cross bar that caused an unbalance between the two carbs.. If it wasn't right it would cause a higher rpm miss. I confirmed this was happening by watching my EGT's. One whole bank was about 100-150deg cooler than the other.

you need 2 air flow meters and rev to 3-4k rpm. The left bolt gets loose and you move around the cross bar at that bolt area to balance.

[911pcars]

Ron,
Good reminder. It's probably more important to confirm the carbs are synched at speed rather than perfect at idle. Lacking two calibrated synchrometers (air flow measuring devices), one can set the throttle stop by hand, then alternate measuring the two banks with a single meter.

Sherwood

[RoninLB]

Originally posted by 911pcars

Good reminder. It's probably more important to confirm the carbs are synched at speed rather than perfect at idle.

I was amazed at the EGT difference that was caused by a slight imbalance caused by that crossbar. That led me to figure out that one air meter should be RPM set so it's an accurate eyeball reading on the dial and the other set to that accurate reading.