Landracing Forum
Tech Information => Technical Discussion => Topic started by: Hank on July 26, 2005, 11:35:18 AM
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I am headed out to Gene Burkland's this afternoon to start testing tires.I am going to test 3 sets of tires I am going to use.One set is a shaved road race tire by Michelin,and also a set of HPX street tires.I am also testing a set of Bridgestone OEM tires.2 sets are shaved(the Michelins),and the OEM's are not.I am going to spin and load them up to 300-325,and note ANY changes.As I am certainly no expert on this,I thought maybe somebody may have a suggestion on the process,or what
areas to pay special attention to.I will post my results when finished.
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Well Hank honestly you just have to stand back and watch, you are having your tires spun tested probably by the most informative group outside of a manufacture. Listen to what they tell you. And beleive me they know what to look for.
Jon
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they WONT be load testing them though..........
only free wheeling spin test..............
cool, anyhow.........
Joe :)
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Here is an idea for a tire test jig: Use the same method of spinning up by hydraulic pump to chosen speed, but have the driven tire ride against a free turning, for example, front tire, with controlled tension against surfaces set to approximate weight of the vehicle. And maybe wrap a cage around the whole test fixture.
If it was me, I'd run up one set of new F& R tires through a number of heat cycles, to "set" them, then saw across the tread in several places to look for signs of separation.
This would be a test of tires in a jig. Naturally, the real world is the practical factor.
Disclaimer: The above is an opinion and the writer neither suggests nor endorses it; and recommends to not try this at home.
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Are the tires broken in ?
The real test must include a load. Not only weight but power. The temp of the surface must be simulated or the test won't be valid.
Remember, you are testing the tread bond to the casing. Extra unsupported rubber not removed with proper shaving will contribute to an early failure.
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Warum einfach wenn komplitziert geht's auch?
Anyone have a suggestion for an inexpensive(!) way to add appropriate drag to the driven tire?
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Well we know Dunlops have been tested to 256mph, what was the results today on the spinner machine, I bet with no load they both worked perfect. :D
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Testing was put off untill Thur. morning due to additional work needed on the adaptor.As for the load portion,I was originally told that speed and load could be tested.I am going to film the testing and try to get it posted where it can be seen by anybody interested.If anybody is interested in hosting the video,please let me know.Gene and Betty have a test protocol in place.How valid it is,I do not know,but it seems that even if it's just spinning the tires up to speed,it may provide information that I don't have now.
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Hank,
I will host the video, just get it to me and ill host it.
Jon
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yes Hank most additional info is cool.........but
the BEST info thus far........is real world......zr
radials on the salt surface over 240 for 2-3+ miles,
and in come cases 250+ for 2+ miles.....with no apparent
signs of heat issues.........blistering is common on highspeed
tests on pavement....and it is accepted...change tires more often...
we are not even showing the signs of heat issues at Bonn........cool
Joe :)
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yes Hank most additional info is cool.........but
the BEST info thus far........is real world......zr
radials on the salt surface over 240 for 2-3+ miles,
and in come cases 250+ for 2+ miles.....with no apparent
signs of heat issues.........blistering is common on highspeed
tests on pavement....and it is accepted...change tires more often...
we are not even showing the signs of heat issues at Bonn........cool
Joe :)
I agree Joe.I hope to present testing data(albeit the protocol) to SCTA that they may take for consideration on the tire speed limits now used.
Besides----we plan on spinning one to destruction,and blowing shit up is cool! :D :D
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yeah, yur funny.........ask your tire tester
how far away he plans to be............i
....IF THE RIM FAILS BEFORE THE TIRE.....do we
need a new rule book.........or do we start
shaving them too???????????
Joe (shaving-books-rims...and hey honey..) Amo :)
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If you are just going to free spin them, gear up a beater bike and do it at home on the stand.
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I went out last night to watch the set up of the test equipment.It seems to the uneducated eye that Gene and Betty have taken a lot of thought into how the testing is done.Testing forms for recording information,various intruments to record data,and a background board to watch tire growth are being used.They are well aware of rim failures and no one is going to be standing around the tires while they are being tested.They are using video equipment to record the tests from different angles,and Betty is going to give me a copy of the video after.They have done testing with Mickey Thompson in the past.The protocol seems fairly extensive.I have decided in light of possible liability issues to give the information gathered by this testing to anyone who asks for it,but not post it in an open forum.
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Updates? ?
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Any news yet on this test? Any information is good to know. Just wondering.
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Testing, testing, 1....2.....3...... any results yet? Hello, hello is any one out........
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Tires were spun into the 300's, new and shaved. NO tires came apart and there was very little growth to the tires. All tires looked great after the testing.
Maybe Hank can tell us more about it when he has time....
Jon
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Tires were spun into the 300's, new and shaved. NO tires came apart and there was very little growth to the tires. All tires looked great after the testing.
Maybe Hank can tell us more about it when he has time....
Jon
Jon is correct.I will answer any questions on a PM basis.
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Hank,
Thanks for all your hard work, for yourself and the motorcycle guys.
Thanks to everybody involved.
Jon