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Gene Bennett | 1 Apr 2007 01:41

Re: Carbon Wheels-Safe? OK?

 From the 2007 GCR:

"9.3.35. NON-METALLIC WHEEL CONSTRUCTION
Non-metallic chassis construction is prohibited, except in ASR, CSR, 
DSR,  S2000, and FA, where it is allowed. "

And this from the April FasTrack and Master Tech Bulletin:

"GCR – April   1.  Correct section 9.3.35, p. 84, by inserting the 
following, Non-metallic wheel  construction is prohibited.  Note: this 
was formerly a part of section 11.2.1.Z but was inadvertently omitted 
from  the 2007 GCR."

So,m they are not allowed.

Gene near Seattle

On Mar 31, 2007, at 12:32 PM, Steven Dodd wrote:

> With all of the wheel talk has anyone tried or have knowledge of the 
> Carbon Fibre wheels offered by Hyper racing for use on 1000cc oval 
> cars?
> To all of the P.E.s out there, is this a safe experiment to try for a 
> 900lb car driver combo in F5?
> Thanks in advance,
> Steven Dodd
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Jan Schmidt | 1 Apr 2007 05:28
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Re: Carbon Wheels-Safe? OK?

I am friends with one of the salesman at Hyper and have played with the
wheels a little bit. Two major problems: they currently dont have our
bolt patterns in production and $1100 per set of wheels, no thanks! My
$120 set of used Douglas wheels work just fine.
Bill Schmidt 88 RD Kawi

>>> "Steven Dodd" <stevendodd928@...> 03/31/07 2:32 PM >>>
With all of the wheel talk has anyone tried or have knowledge of the
Carbon 
Fibre wheels offered by Hyper racing for use on 1000cc oval cars?
To all of the P.E.s out there, is this a safe experiment to try for a
900lb 
car driver combo in F5?
Thanks in advance,
Steven Dodd
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Chuck Voboril | 1 Apr 2007 06:04
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Re: Carbon Wheels-Safe? OK?

First: Take a look in the FCS and see if they are even legal in F500 (or on 
any SCCA car for that matter)

After you do that, I doubt that you will care about reading further-but here 
it goes anyway:

The answer to whether they are safe is: "it depends"

The strength is heavily material and process dependent-
So, with a really good recipe developed with lots of testing-a mfg can have 
one good set of wheels.

Question is: "Can he make many sets of wheels where every single one has 
adequate strength?"

That said, companies like Dymag have been making CF wheels for MC for years 
and they do a huge business.

However, it took them quite a lot of R&D to concoct a wheel that met or 
exceeded the metal ones  in every regard.  Big Big investment to get to 
where they are today.

All CF wheels are NOT the same.

Chuck

and inspection for voids is difficult.

Chuck
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Ted Rudolph | 1 Apr 2007 05:55

Seat Belt mounting & HANS Device

Today I took my car to a Region-wide tech inspection & was failed for my
seatbelt mounting..... 

The FIA-spec Whilans belts were mounted in accordance with the
manufaturer's docs (mounting points at 9" width). However, I use a HANS
device in the car, and the HANS instructions reccomend a 3" mounting
width for the belts. The GCR does not specify a width in the written
rules, however the drawing on page 76 indicates a 4" to 6" width. 

Now in a production car where the belts are mounted a distance behind
the driver, that makes perfect sense. However, in my little formula car
the vertical portion of the HANS device almost sits between the Whilan's
mounting tabs (there's about 1" between the back of the HANS and the
crossbar mounting point). Pulling the belt mounting tabs inward 3 inches
would be nearly impossible in my opinion. 

So what kind of width do other folks have on their cars? Has anyone
moved their mounting point in accordance with the GCR drawing?

-Ted
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Chuck Voboril | 1 Apr 2007 06:14
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RE: F500/F600 Proposal

Chris,
A definite rearwards weight bias and good front end geometry means you do 
not need a limited slip.

FF1600, FF2000, and S2000 all do just fine with no limited slips.

If you do not meet those 2 criteria I mention above and you are road racing- 
then lock the IRS rear.

Chuck
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Eric D Christensen | 1 Apr 2007 19:10

RE: Unsubscribing to F500.org

If you can't use the web page to unsubscribe for whatever reason, just send
a message to f500-request@... with the single word "unsubscribe" in the
message body. You'll be deleted immediately.

----------
Eric D Christensen
Proadmin, Inc. 

> -----Original Message-----
> From: f500-bounces+edc=proadmin.com@... 
> [mailto:f500-bounces+edc=proadmin.com@...] On Behalf Of 
> smpottinger@...
> Sent: Thursday, March 29, 2007 7:27 AM
> To: f500@...
> Subject: Re: [F500] Unsubscribing to F500.org
> 
> I am very serious, I need to unsubscribe this thing and I 
> can't seem to make that change. Can anyone help me??? 
>  
> -----Original Message-----
> From: cvoboril@...
> To: f500@...
> Sent: Thu, 29 Mar 2007 1:08 AM
> Subject: Re: [F500] Unsubscribing to F500.org
> 
> 
> Doctors say that low level exposure can help make you immune. 
>  
> Delete every other post-or at least the ones from your most 
> very un-favorite poster of the week.
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Christopher Eveland | 2 Apr 2007 16:42
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Autox and belts

Hi all-

I took the Red Devil to its first autox yesterday, and ran into a
little snag: I broke the drive belt (is that what we call the one that
isn't part of the CVT?) on my second run.  It broke somewhere near the
start... I'd guess on a rational level that it broke on the launch,
but I swear I had power for at least the 1st 20 feet, and I did get up
enough speed to coast well off the course.

Anyway, I have a spare belt, so I can replace that, but I'm wondering
if there is any autox specific trick that should be employed to keep
this from happening again.  Different tension? Driver adjustments?

Thanks for the tips,

-Chris
________________________________
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cajunchiroman | 2 Apr 2007 18:42

Re: Autox and belts

Did the belt brake or did the teeth get chewed off?  how long is the belt?  How tight was it?  Are you going to auto
X, road race or both?  

-----Original Message-----
From: eveland@...
To: F500@...
Sent: Mon, 2 Apr 2007 9:42 AM
Subject: [F500] Autox and belts

Hi all- 

I took the Red Devil to its first autox yesterday, and ran into a 
little snag: I broke the drive belt (is that what we call the one that 
isn't part of the CVT?) on my second run. It broke somewhere near the 
start... I'd guess on a rational level that it broke on the launch, 
but I swear I had power for at least the 1st 20 feet, and I did get up 
enough speed to coast well off the course. 

Anyway, I have a spare belt, so I can replace that, but I'm wondering 
if there is any autox specific trick that should be employed to keep 
this from happening again. Different tension? Driver adjustments? 

Thanks for the tips, 

-Chris 
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JBlumenthal | 2 Apr 2007 18:58

Re: Autox and belts

Chris,
 There could be a few things contributing to the problem. Take a close 
look at the cogs in the belt and see if there is evidence of wear from 
the belt ratcheting on the front gear. Some folks have had problems if 
the front gear is too small because it doesn't allow for enough belt 
contact. If memory serves me, this can be a problem if the front gear is 
less than 24 teeth.  Could you hear anything that sounded like the belt 
may be ratcheting on the gear?
  If the belt just broke, it could be due to excessive tension caused by 
a bumpy surface. Depending on the car's design, suspension travel can 
cause the belt to get real tight and under the right circumstances it 
can snap (it happened to me once in Topeka upon 'landing' after hitting 
one of the real bumpy parts of the course).
  I used to set the belt tension such that, with the car sitting on the 
ground, I could twist the belt with my hand and get it to go about 65-75 
degrees from it's resting position with moderate amount of effort.
  What you experienced may just be a fluke. It can happen. Check the 
belt tension. Check the size of the front gear. Check to see if there 
was ratcheting.
  I didn't want another broken belt so I switched my car to chain drive 
and am very happy with it.
-Jeff Blumenthal

Christopher Eveland wrote:
> Hi all-
>
> I took the Red Devil to its first autox yesterday, and ran into a
> little snag: I broke the drive belt (is that what we call the one that
> isn't part of the CVT?) on my second run.  It broke somewhere near the
> start... I'd guess on a rational level that it broke on the launch,
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Art | 2 Apr 2007 20:28

RE: Autox and belts

Chris,

I replied to you on the eformulacarnews forum but just to rehash it here, I
use a "racing" type belt for my solo car like you. It is 36mm wide. Never
had a breakage problem in the 11 years it has been on the car. It has gone
through many, many autox starts without a problem.  Perhaps your belt had
damage that you didn't see. Perhaps a pebble got caught up in the belt and
caused the failure. There could be many explanations beyond the width of the
belt causing a problem.

Did you get a "ratcheting" of the belt when you left the line? If you did,
then your belt needed adjustment and that's why it broke. Was it aligned
properly? Did a foreign body get caught up in the belt? All questions that
could lead to an answer on the failure. I wouldn't be so quick to go with a
wider belt until I put a new 36mm belt back on, adjusted it right, and made
sure that everything else was correct. 

Just my 0.02 :-).

Art 

-----Original Message-----
From: f500-bounces+qreshadow=bellsouth.net@...
[mailto:f500-bounces+qreshadow=bellsouth.net@...] On Behalf Of
Christopher Eveland
Sent: Monday, April 02, 2007 9:42 AM
To: F500@...
Subject: [F500] Autox and belts

Hi all-
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Gmane