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Throttle Return Spring ?
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DRR Pro
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Throttle Return Spring ?

I have a new throttle body to install that has three (3) shaft mounted return springs on the two shaft blades. Two springs on the front shaft and one spring on the rear shaft. The front and rear shafts are mechanically linked. Am I required to have an additional return spring, mounted to the throttle body front throttle arm that is attached to the foot throttle shaft?

Here’s the rule from NHRA.

1:12 THROTTLE
Regardless of class, each car must have a foot throttle
incorporating
a positive-acting return spring attached directly to
the carburetor/injector throttle arm. A positive stop or override
prevention
must be used to keep linkage from passing over
center and sticking in an open position. In addition to return
springs, some means of manually returning the throttle to a
closed position by use of the foot must be installed on all altered
linkage systems except hydraulically or cable-operated systems.
Per Class Requirements throttle control must be manually
operated by driver’s foot; electronics,
pneumatics, hydraulics,
or any other device may in no way affect the initial throttle
operation. In Super Street, Super Gas, Super Comp, and certain
E.T. bracket classes, timed throttle stops are permitted that use
pneumatics and or electronics to modulate the throttle after
initial launch. Cable throttle systems permitted. NHRA-accepted
hand controls for the physically challenged permitted.
Choke
cables and brazed or welded fittings on steel cable prohibited.
No part of throttle linkage may extend below framerails.
 
Posts: 2500 | Location: 53056 | Registered: December 30, 2009Reply With QuoteReport This Post
DRR S/Pro
Picture of Lenny5160
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Seems pretty clear to me that you’d need an additional spring acting on the throttle arm.


Tony Leonard
 
Posts: 3172 | Location: Inver Grove Heights, MN | Registered: March 18, 2004Reply With QuoteReport This Post
DRR Pro
Picture of Alaskaracer
posted Hide Post
Yes, you still have to have the spring on the arm....


Mark Goulette
Owner/Driver of the Livin' The Dream Racing dragster
www.livinthedreamracing.com
"Speed kills but it's better than going slow!"
Authorized Amsoil Retailer
 
Posts: 1503 | Location: Back home in Alaska! | Registered: February 13, 2011Reply With QuoteReport This Post
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