Author Topic: motorcyle tires on a streamliner...  (Read 14285 times)

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Offline fastman614

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Re: motorcyle tires on a streamliner...
« Reply #30 on: April 01, 2013, 03:29:48 AM »
Does the rearrangment of this sentence from 2.F, 2013 rulebook read better?

"The use of any non-rated tire(s) such as implement, farm, aircraft, motorcycle, reproduction of a vintage automobile tire, 17" drag race tires or any non-pneumatic wheel/tire combination (no rubber) shall be submitted for approval to the contest board in writing 45 days prior to an event."

DW

Dan, to me it is clear -  the clause as written does NOT specifically preclude the use of motorcycle tires.... It DOES, however, require a written submission to the contest board!.... I would assume that a carefully thought out submission with as much relevant information as is possible to obtain would be included in the contents....
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Offline Stainless1

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Re: motorcyle tires on a streamliner...
« Reply #31 on: April 01, 2013, 10:03:04 AM »
We ran motorcycle tires on the lakester until we realized that it would go a lot faster with smaller tires.  I think 208 to 211 was the fastest we ran them.... was in the days when we ran 3 runs, so probably early 90s.

With all 4 bike tires, ran about 176 on gas

Picked up 10MPH with the small fronts on gas...  This pic was when we were running 2 passes on N20 in the 208-211 range... required 3... small back tires and a lot of testing put JB in the club in 95... of course we had 2 years off to prepare.

Stainless
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Offline Ron Gibson

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Re: motorcyle tires on a streamliner...
« Reply #32 on: April 01, 2013, 10:28:25 AM »
Dan
I don't have a 13 book yet. In your "valued" opinion, do you think the 18" Dunlops mine and several other roadsters are running, fall under the "reproduction of a vintage automobile tire" classification? They are a reproduction of a vintage "racing tyre" and have been ran at speed. Does the fact they say racing on the side make them legal or do  we need to try to get special permission or are they just flat out banned?
Thanks for all the help, time and wisdom you give to this board. It is greatly appreciated.

Ron
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Offline dw230

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Re: motorcyle tires on a streamliner...
« Reply #33 on: April 01, 2013, 11:14:28 AM »
The Dunlops have been used as you mentioned. I am not allowed to put forth an official decision. Please contact either Lee Kennedy or Steve Davies, section 16 in your rulebook.

These tires are not specifically forbidden in the rulebook - see rule 1.A.

Good luck,
DW
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Offline Steve Walters

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Re: motorcyle tires on a streamliner...
« Reply #34 on: April 01, 2013, 12:09:00 PM »
To all of those I have offended, I'm sorry.  The picture that was posted has two of my good friends and fellow techs in them, I took the picture as a personal insult to their integrity and acted stupidly.  I'm sure it wasn't posted in the way I took it, you have the right to post what ever, and say what ever.  I'm not the master of good intensions I think I am, I'm just a crotchity old flacthulater, I didn't want to become.

Steve   
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Offline Rex Schimmer

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Re: motorcyle tires on a streamliner...
« Reply #35 on: April 01, 2013, 01:02:39 PM »
The car in the photos is Darrell Zipper's K gas lakester that he ran several times probably 5-6 years ago. It had a 440 snowmobile engine in it and I don't think that it ever ran over 120. I happen to be in the inspection area when Darrell was discussing the use of motorcycle tires with the SCTA inspectors. The reasoning went something like this: The tires are rated for 165 mph, their load rating exceeded the corner weights of the car by a pretty large factor, and the class record at the time was about 150 mph.

If you look at say the Pirelli GP motorcycle tires they are speed rated at 165 mph and that could certainly  probably be moved up by shaving the tires. Before the new motorcycle tire rule change came out several years ago that the faster "sit on" bikes, ie turbo Hyabusas etc, must run on Bonneville speed rated tires most of them ran on the GP style Pirelli, Dunlop, Michlen tires and there were many runs over 250 mph. If you looked at the lead blocks strapped to the swingarms of these bikes and add the riders weight into it I would bet that the tires were carrying 300+ lbs loads.

Regarding the Goodyear 17 inch dragster front tire, I think that the small section tire is limited to 200 mph max speed but I have never heard what the Bonneville/SCTA speed rating is on the new dragster front tire that is somewhat wider. The problem, as I understand with the small dragster front is that at about 275 mph the tire will not stay on the bead, and there have been incidences of this happening which lead to the 200 mph speed limit.

Rex
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Offline jo maoma

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Re: motorcyle tires on a streamliner...
« Reply #36 on: April 01, 2013, 09:31:14 PM »
Dan, to me it is clear -  the clause as written does NOT specifically preclude the use of motorcycle tires....

that's how i was reading it and why i wanted to clarify, but as i said i was told
no moto tires period so maybe a tweak of the text is still needed (i was thinking
it was just me being slow on the uptake)...  :-D

Offline jo maoma

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Re: motorcyle tires on a streamliner...
« Reply #37 on: April 01, 2013, 09:51:02 PM »
First..... what exactly is the car going to be ?..... What speeds do you expect?.... Okay now..... with a bit more information, we could possibly steer this topic to viable alternatives to motorcycle tires.

i guess i should start a build thread. i was building it to run on the Ω/GS
record of 55.139 the car is being designed to run a rotary vane motor
powered by Mentos and Diet Coke...

Offline racergeo

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Re: motorcyle tires on a streamliner...
« Reply #38 on: April 02, 2013, 12:16:29 AM »
    Rex, I've told my experience with Goodyear 17" dragster front tires on this forum on a few occasions. I blew one at about 270 and hit the 4 mile marker. The other tire was on the verge of failure as several big chunks of rubber had come off it. Lee said "no more". So when I set the record in 07 I had shaved 24" M@Hs on the rear.(FWD) I asked Lee if I could try motorcycle race tires and he agreed. He followed me the first couple trial passes. eventually made 6 or 7 runs over 270 with the sides completely shaved and about half of the tread shaved. I am going to shave the last 80 or so thousanths off the crown of the tire and believe they would be good to 300. The Pirelli engineers that allowed me to buy there tires for a non MC purpose looked at the Goodyear Front runner that failed and reckoned the bead which they had me cut so they coud observe its construction  was about half as strong as the tire they chose for me to use. The clincher was the radial steel cords that they said prevented the tire growth that lead to the Goodyears failure. Anyway, I ain't afraid.

LittleLiner

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Re: motorcyle tires on a streamliner...
« Reply #39 on: April 02, 2013, 01:28:18 AM »
To all of those I have offended, I'm sorry.  The picture that was posted has two of my good friends and fellow techs in them, I took the picture as a personal insult to their integrity and acted stupidly.  I'm sure it wasn't posted in the way I took it, you have the right to post what ever, and say what ever.  I'm not the master of good intensions I think I am, I'm just a crotchity old flacthulater, I didn't want to become.

Steve   

Ditto.
 I have a short fuse sometimes.  I can assure you that no matter how it may have appeared, I was only offering the photos to generate more discussion about using M/C tires on cars.  I did not intend to imply anything negative about any officials.   

Art

Offline Rex Schimmer

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Re: motorcyle tires on a streamliner...
« Reply #40 on: April 02, 2013, 11:50:21 AM »
As George (racergeo) has said he has ran over 270 with shaved motorcycle tires and the application was approved by SCTA and his experience has been nothing but positive so if you are thinking about this type of application obviously you need to be contacting the right people at the SCTA. Thanks for your input George as you know it was your experience I was talking about. George's application are the rear tires on a front wheel drive lakester so they are not driving the car only holding the back up and going along for a pretty fast ride.

Rex
Rex

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