[F500] Even more Newbie questions

[Mike Moench]

Sorry Eric.........some of your facts are confused. (that is as polite as I
can be)
I am not flaming you or anyone else...........This is how I see and remember
things............................

Dave Elliot was the one who was DQed for no thermostat.

As for the jackshaft brake, it does act directly on the rear wheels.
The jackshaft brake is standard on the Sidewinder F500 and the DSR.
Just look at snowmobiles, the only brake they have is on the
jackshaft...............As for the loads the front brakes supply 70% of the
stopping power. The jack shaft brake spins 3 times faster than the rear
axle......It also has 3 times the leverage...................Just think of
all the unsprung weight off the rear axle!
The jackshaft brake on the DSR works great even from 151mph at 1040 lb
weight.
I have figured the ftlb of torque for the brake VS the acceleration, with
the weight transfer of acceleration the rear tires have allot more load than
when braking.
In 10 years I have never seen a PGT belt break or strip out.
Sudden loss of rear brake does NOT cause the car to snap spin. Conversly
loss of the front (too much rear) brakes causes the rear to come around.
The drive belt is as direct a connection as a drive shaft or axle shaft when
it is correctly engineered.
There is no max distance behind the rear wheels that I know of other than
exaust.

"That can't be done" "That will never work"  "That big diffuser won't work"
"That big diffuser is rediculous" "Gwad look at the size of those brakes!"
"alluminum won't work for a brake disc" "That car will never go fast" "What
the heck is that?"

JB and I have heard all of the naysayers and we have proved them wrong time
and again.


It does pass tech. It also passes the competition.

Eric...I know your not a naysayer and I thank you for everything you do for
all of us.........including letting me vent!

Thanks!
Sidewinder Mike
----- Original Message -----
From: "Eric D. Christensen" <edc at proadmin.com>
To: <f500 at f500.org>
Cc: <ted_rudolph at hotmail.com>; <f500 at www.f500.org>
Sent: Tuesday, May 20, 2003 8:05 PM
Subject: Re: [F500] Even more Newbie questions


> On Tue, 2003-05-20 at 15:03, Ted Rudolph wrote:
>
> > 1) Brakes - does the rear disc have to be mounted on the live axle The
rule
> > book states (pardon my paraphrase): Two independent systems acting on
separate
> > wheels, failure in one system won't effect the other. For packaging and
and
> > balance, the disc would fit better on the jackshaft than on the live
axle.
> > >From a safety standpoint, the jackshaft option would be belt dependent,
but in
> > the case of a belt failure the front brakes would still work (and you
wouldn't
> > have the motor still driving the car anyway).  Conceptually, it isn't
any
> > different from an in-board brake system. But will tech see it that way?
>
> No! That won't pass muster with tech at all because the brake is no
> longer actuating on the wheel or anything directly connected to the
> wheel. I would consider that a very unsafe configuration - not only for
> you, but for other cars around you.
>
> The belt won't hold up to braking force anyway (which is a level of
> magnitude greater than acceleration loading). It's not like the inboard
> brakes on a FF. The CV joints are positive interface and fully capable
> of handling braking load. It's also unlikely the both sides would fail
> simultaneously.
>
> If... or should I say when... that belt fails under heavy braking and
> you suddenly only have front brakes you will likely snap spin so fast
> that you'll see your own rain light in front of you due to the instant
> weight transfer taking all weight off the rear wheels.  The best you
> could hope for is to lock the fronts and push straight off the corner.
> Hopefully there is runoff room and nobody outside you.
>
> > 2) Rear diffusers.  I know some of the cars are running them
(Sidewinder,
> > Novacar?), yet I can't find much information about regulations.  Are
they just
> > considered part of the bodywork or are there more specific limitations
> > (length, width, exit height / sq inches)?
>
> The diffusers design is open behind the rear axle. Per the rules the
> undertray must be normal to within 1" back to the rear axle. Beyond that
> its yours to play with. The undertray and diffuser must still fit the
> maximum dimensions for overall bodywork (it's considered part of the
> bodywork for dimensional specification purposes). In particular, the
> overall length and max distance behind the rear axle must be taken into
> account.
>
>
> > A) I also have Don Hennigan's old Red Devil that is set up for
autocrossing
> > (and I have a couple of Kawasaki 440s to use in it).  The one piece I
need
> > right now is a thermostat for the engine.  I tried my local dealer and
he's
> > useless. It appears the thermostat acts as a two way valve, so I'd need
to
> > block one of the feeds if I were to remove the thermostat completely.
Does
> > anyone have any experience running a non-thermostat 440? This will be an
> > autocross only car, so it's not like it will see long term high
temperatures.
>
> Sorry, I can't help you there. The thermostat is required on the Kawi
> for road racing (and as such should be in FM too, as I understand it).
> IN fact Arron Ellis lost a national championship several years back over
> a technical DQ over a missing thermostat.
>
> Dennis Kirk motorsports is often a good source for old snow machine
> parts. The Kawi 440A engine has been out of production for so long
> (15... maybe 20 years now) that Kawasaki dealers aren't going to be of
> any help.
>
> --
> Eric D. Christensen <edc at proadmin.com>
> Proadmin, Inc. - http://www.proadmin.com
>
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