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Author Topic: 12 sec with STOCK fuel pump?  (Read 3701 times)
Jon
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12,3@174km/t at Gardermoen 2008


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« on: March 30, 2007, 15:17:18 pm »

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? 
 
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Alan Uyeno
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« Reply #1 on: April 01, 2007, 07:40:11 am »

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!!
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Jon
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12,3@174km/t at Gardermoen 2008


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« Reply #2 on: April 01, 2007, 23:38:52 pm »

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 rpmīs.
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Alan Uyeno
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« Reply #3 on: April 02, 2007, 01:03:03 am »

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.
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ovaleasy
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« Reply #4 on: April 13, 2007, 03:54:37 am »

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.
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Jon
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12,3@174km/t at Gardermoen 2008


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« Reply #5 on: April 13, 2007, 09:54:19 am »

Impressive Ovaleasy!
Did you you modify it in any way?
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ovaleasy
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« Reply #6 on: April 13, 2007, 16:53:52 pm »

No. The only modification to the fuel system was a vent for the tank.
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RhoadsVW
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« Reply #7 on: May 08, 2007, 01:11:21 am »

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
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