12 sec with STOCK fuel pump?

[Jon]

Can it be done, or is it just one of these things you hear about, that can't be done?
I love the way the old race engines look, especially, the Inch Pincher look with the stock pump. I hear you can "blueprint" them, are we talking about making sure the rod has no play before actuating the "leaver"? I thought about moving the pump 1mm over to move the rod closer to the pivot point to get a higher ratio on the lever.

Did anyone play with these things back then? 
 

[Alan Uyeno]

I would guess a stock pump can provide enough fuel to the IDA's as long as the fuel inlet is opened up and larger needle/seats (3mm) and an opened up float bowl is used.

If your car uses E85 fuel I'd say NO WAY!!

[Jon]

Thanks for the replies, I have a pair of 3mm valves laying around. But before I go this route I will do some "field tests". The hard part is to figure out how much it delivers on 6000-7000 rpm´s.

[Alan Uyeno]

According to mallory a 200HP engine can use upto 46gph with a dead head regulator with electric fuel pump. I'm assuming theres safety worked in with that sort of calculation.

If you have 3mm n/s and opened up float bowls you might be fine. The little cavity in the IDA thats opened up is aproximately an ounce more of fuel so thats just a good bump in capacity.

6000-7000rpms will only occur for short durations of time in the 1/4. You might just be fine. An a/f meter would indicate lean fuel deprevation if you can data log. If not you'll probably feel a slight nose dive at the end of each gear.

[ovaleasy]

I have run in the 12:30s @108 mph with a stock fuel pump and unmodified 48IDA's.
Motor size was 78X89 in an average weight street car.

[Jon]

Impressive Ovaleasy!
Did you you modify it in any way?

[ovaleasy]

No. The only modification to the fuel system was a vent for the tank.

[RhoadsVW]

With a stock fuel pump in the 70's Mark Hunsaker ran a 12:30 with an IDA motor built by FAT Performance.
       Dave Rhoads