At 09:48 PM 5/12/99 , Jamie Sculerati wrote:
>
>----- Original Message -----
>From: Lance Schueneman <lances@wt.net>
>
>> Can anyone help me out here? I am currently running ST and building my car
>up
>> for it. I read the rule book about Underdrive Pulleys and talked to a CSP
>competitor
>> because ST uses the CSP rule in that case, and they are illegal. Now,
>after
>> some discussion on a message board, someone else states that there's been
>a
>> rule update in SportsCar that says that they are legal. Can someone shed
>some
>> light on this?
>
>The earlier question refered to accessory pulleys only. From the SIIR:
>
>14.10 Engine and Drive Train
>U. Any accessory pulleys and belts of the same type (e.g., V-belt,
>serpentine) as standard may be used. This allowance applies to accessory
>pulleys only (e.g., alternator, water pump, power steering pump, and
>crankshaft drive pulleys). It does not allow replacement, modification, or
>substitution of pulleys, cogs, gears, or belts which are part of cam,
>layshaft, or ignition drive or timing systems, etc. Supercharged cars are
>excluded from this allowance. This does not permit replacement of integral
>pulley-dampener/balancer assemblies.
>
>An underdrive pulley on the crankshaft is an illegal modification.
Hmmm. Any pulleys that drive _accessories_ can be changed out.
I have written a letter and received a response that confirmed that
such rule allows you to put different size accessory pulleys such
that they underdrive the accessories. That is okay -- but the accessories
must be driven. Thus, the often marketed "underdrive pulleys" are legal.
You cannot change pulleys that drive the camshaft, timing, or any part of
the engine. And if your car has a supercharger, no pulleys can be changed.
>
>>I think that they should be legal, because it's a fairly easy
>> modification that most of the sport compact market has and many people
>already
>> do have on their car.
>
>Quite true. The STU rules seem to allow this:
>
>VII. ALLOWED MODIFICATIONS (STU)
>
>1. The following additional Street Prepared rules are allowed: 14.1.C&E;
>14.2.A&B; 14.4, 14.6, 14.9.
>
>2. Drivetrain and related components (induction, ignition, fuel systems,
>etc.) are unrestricted except for the following limitations:
>A. All components must be emissions legal (California Air Resources Board
>Certified, etc.), or vehicle must have a valid state emissions
>sticker.
>B. Vehicle must be legally registered for the street.
>C. Must comply with section 3.6.B regarding fuel
Hmmm. ST allows 14.10.V explicitly. 14.10.V?? I assume that is a typo and
they meant to allow 14.10.U explicitly. That should be confirmed with a
letter, if the typo correction hasn't already appeared in FasTrack.
Brian
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