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Old 05-08-2008, 03:04 PM   #1
SSDiv6
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Default NHRA Technical Reminder: Battery Location

In today's NHRA website:

http://www.nhra.com/content/news/28815.htm

NHRA Technical Reminder: Battery Location
5/8/2008
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Technical reminder to all Stock and Super Stock classes: All batteries must be in their original location or may be relocated to the trunk per NHRA Rulebook:

NHRA Rulebook pg. 88 Section 4 - General Regulations; Electrical/Control: 8:1 Batteries “Batteries may not be relocated into the driver or passenger compartments.”

NHRA Rulebook pg. 144 Section 9A – Stock Cars; Electrical: 8 Batteries “Must remain in the stock location and be of sufficient capacity to start car at anytime. Second battery permitted if securely mounted in trunk.”

NHRA Rulebook pg. 154 Section 10A – Super Stock; Electrical: 8 Batteries “Trunk installation permitted; two batteries permitted.”

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National Hot Rod Association
http://www.nhra.com/
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Old 05-08-2008, 04:18 PM   #2
Kenny Wigington
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Default Re: NHRA Technical Reminder: Battery Location

I take it, they are looking at batteries for the next few races ?
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Old 05-08-2008, 06:45 PM   #3
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Default Re: NHRA Technical Reminder: Battery Location

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Originally Posted by Kenny Wigington View Post
I take it, they are looking at batteries for the next few races ?

A S/S car was found with the batteries mounted in the wheel tubs ahead of the rear tires...NASCAR style. That modification was ruled to be out of compliance with the rulebook.


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Old 05-08-2008, 10:47 PM   #4
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Default Re: NHRA Technical Reminder: Battery Location

Ahead of the tires? Good reason to look then.
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Old 05-08-2008, 11:12 PM   #5
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Default Re: NHRA Technical Reminder: Battery Location

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Originally Posted by Travis Miller View Post
A S/S car was found with the batteries mounted in the wheel tubs ahead of the rear tires...NASCAR style. That modification was ruled to be out of compliance with the rulebook.


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Not only NASCAR...that is an ideal place to put ballast in many cars.
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Old 05-09-2008, 10:04 AM   #6
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Default Re: NHRA Technical Reminder: Battery Location

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Not only NASCAR...that is an ideal place to put ballast in many cars.

Although it has been a while since I read his suspension book, as best I remember Dave Morgan wrote that an ideal place to put ballast was from the centerline of the rear axle to just ahead of it. The heavier the car is at that point, the harder it will plant the tires when the rear suspension tries to spread on a launch. If the car goes into a wheelstand the weight is still right where it is needed. His theory is putting ballast closer to the rear bumper on a car with a long overhang is a waste and causes the car to pivot on the rear tires.

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Old 05-09-2008, 10:10 AM   #7
Daran Summerton
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Default Re: NHRA Technical Reminder: Battery Location

Does this mean you have to have plates and acid in the front battery???? See, this rule book is so vague...
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Old 05-09-2008, 11:27 AM   #8
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Default Re: NHRA Technical Reminder: Battery Location

Quote:
Originally Posted by Travis Miller View Post
Although it has been a while since I read his suspension book, as best I remember Dave Morgan wrote that an ideal place to put ballast was from the centerline of the rear axle to just ahead of it. The heavier the car is at that point, the harder it will plant the tires when the rear suspension tries to spread on a launch. If the car goes into a wheelstand the weight is still right where it is needed. His theory is putting ballast closer to the rear bumper on a car with a long overhang is a waste and causes the car to pivot on the rear tires.

Travis

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You are correct...that is the reason why many cars do a porpoise movement while going down the track: they have put ballast close or behind the rear bumper.
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