NHRA requires two return springs for throttle?

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Dec 20, 2008 | 02:08 PM

JBM

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From: Central PA

NHRA requires two return springs for throttle?

I'm setting up my new motor using an accufab 4500 TB, and have brackets to mount n20 solenoid and throttle cable to the intake. There is a return spring mechanism on the bracket that I'd like to cut off, but I was told I need two return springs per NHRA rule book. Is this one of those rules that is never checked, or does the stock pedal return along with the TB spring fullfill that requirement? Thanks.

Dec 20, 2008 | 05:48 PM

mdacton

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From: Goochland, Va.

they always checked me for both, I just had one of the billet cable/return spring set-ups. I had a 4150 flange but they mak 4500 also

Dec 22, 2008 | 09:00 PM

Villain281H

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From: Gainesville, Florida # of drag strips runs: ?!?!?

Correct, two springs needed on a carb or TB.

Dec 24, 2008 | 09:51 AM

tee-boy

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stuck throttle

JUst in case one gets stuck and you can't get the motor out of gear.

seen it happen.

Dec 24, 2008 | 10:15 AM

jmill96Z

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From: Movin' On Up

My tech guy is **** as hell. He tried to tell me I had to have 2 on my STOCK OEM TB. This rule is meant for carbs. In fact the IHRA book says carbs. I could see putting 2 in a 4150 TB just to get the guy off your back, but on a stock TB?

Dec 24, 2008 | 12:21 PM

tee-boy

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common sense

common sense tells me if it were that big of a deal, someone already would have produced and marketed one of these.

Dec 24, 2008 | 07:32 PM

ShiznityZ28

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From: GB MD

I have been checked for both. the 4500 tb feels real light withonly 1 the 2nd feels better.

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Oct 4, 2010 | 06:08 PM

jmill96Z

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From: Movin' On Up

shaft mounted springs do not count

Oct 4, 2010 | 07:40 PM

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ryarbrough

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From: Mechanicsville, VA

I put two on mine... Friction in the cable liked to hang it open with just the internal spring, and I figured I might as well be legal if I was going to add an external spring.