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2015/2016 ISR oval rules are posted

2015/2016 ISR oval rules are posted

Postby jhooper/HRE » June 1st, 2015, 7:31 am

Champ teams need to be aware of the clarification of "air box pressurization rule".
The old rule simply stated you could not pressure the airbox BUT teams were getting around it by simply putting 1 or 2 small openings that would supposedly stop pressurizing.
The new rule is much less GREY and states that if you have a duct leading to your airbox that could possibly increase flow or pressure you must also have at least the SAME SIZE opening somewhere else in the air box to eliminate the possibility of pressurizing.
This will give the tech guys something to work with instead of just guessing wether or not a certain airbox is legal.

The new boost bottle rule is also in there.

I personally think both of these items are an improvement over last seasons rules. John H.
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Re: 2015/2016 ISR oval rules are posted

Postby 14x » June 1st, 2015, 8:10 am

for the pro-lite class rules state,
1. left ski must be a wide bottom flat ski, with an adjustable, (non cutting, non carbide wear edge) which can be placed anywhere on the ski blank. It may be of any commercial brand or constructed by the chassis builder.

so does his mean the Wahl 03-069A ski is no longer legal?
and how wide is wide? builders discretion?

thanks in advance 14x
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Re: 2015/2016 ISR oval rules are posted

Postby jhooper/HRE » June 1st, 2015, 8:50 am

The only ski you cannot use on the left side is the really aggressive Champ type ski {FOR SAFETY REASONS}. The less aggressive Wahl ski that was used on the left side of F-500 sleds and V-Force pro-lite sleds is still legal but now you will have the option of experimenting with the various "flat bottom" designs that Champ teams use. John H.
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Re: 2015/2016 ISR oval rules are posted

Postby 14x » June 1st, 2015, 9:16 am

jhooper/HRE wrote:The only ski you cannot use on the left side is the really aggressive Champ type ski {FOR SAFETY REASONS}. The less aggressive Wahl ski that was used on the left side of F-500 sleds and V-Force pro-lite sleds is still legal but now you will have the option of experimenting with the various "flat bottom" designs that Champ teams use. John H.


thank you
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Re: 2015/2016 ISR oval rules are posted

Postby Flatout » June 11th, 2015, 8:01 pm

I am pleased with the wording of the fuel testing rules.
Any competitors fuel that fails any field test will be automatically DQ'ed for all classes that day. Also by entering any class the competitor agrees to give up the right to sue for any reason. If the competitor wants to appeal a fuel decision they must present their appeal within 30 minutes of the decision and must bear all costs associated with the appeal.
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Re: 2015/2016 ISR oval rules are posted

Postby Flatout » June 11th, 2015, 8:34 pm

Also please note the new silencer rules for champ. All silencers now require at least 15 holes per square inch and a minimum of 3" in length and minimum 3/8" thick silencing material.

Example: a 3" long, 26mm id silencer needs at least 145 holes of at least 1/8" diameter.
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Re: 2015/2016 ISR oval rules are posted

Postby jhooper/HRE » June 12th, 2015, 8:03 am

This new silencer rule is going to require over half of the current Champ teams to replace silencers to be legal.
A lot of Champ teams are just using straight stingers with a few small holes drilled and an aluminum can slid over the holes to resemble a silencer but are not really silencing anything. There is no real HP advantage, they are just really hard on the ears. John H
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Re: 2015/2016 ISR oval rules are posted

Postby glhperformance » June 16th, 2015, 9:05 am

if I understand it right to me if you had a 1" tube with it being 3 inches silenced that is a total of 3 SQ inches so that means 45 holes. I as a tech guy would enforce it that way .
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Re: 2015/2016 ISR oval rules are posted

Postby RacinFan » June 16th, 2015, 3:41 pm

What is the point of the "silencer" rule?

I can wrap my head around the other rules.

But that seams like a lot of holes in a small space...

So the teams will have to screw on the aluminum can "silencer"?

So it can be easy checked?
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Re: 2015/2016 ISR oval rules are posted

Postby jhooper/HRE » June 17th, 2015, 7:29 am

I believe it is primarily to reduce noise levels slightly so promoters have a better chance of not getting shut down in some race sites that are close to residential areas. It's kinda like a "self preservation" rule. It is also a little safer for kids ears that may be standing close to the race track.
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