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Blake Choquer
Joined: 14 Oct 2008
Posts: 54
Location: United States, Seattle,
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 Posted: Fri Jan 30, 2009 11:58 am Post subject: |
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Hey John
Your absolutely right. The flyweight should be covered. I personally have a Land and Sea dyno, but we wanted to have the most accurate tests possible so thats why we ran it on a inertia dyno.
The engine has a two cooling fans on the radiator. You will see it if you look closely. Slips right over the rad, F1 Style. The room also has a huge air intake fan and exhaust fan.
The dyno is from Kart O Rama and I think they have done a really great job with there dyno room.
Sincerely,
Blake Choquer
www.karttechnik.com |
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Carlos Calderon
Joined: 16 May 2006
Posts: 890
Location: United States, California, San Jose
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| Posted: Fri Jan 30, 2009 2:15 pm Post subject: |
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For those of us that haven't seen them already:
| http://www.kart-rotax.com/news/news.html wrote: | The new centrifugal clutch and balance gears
- have been designed to increase durability and to reduce maintenance.
- have been designed to reduce cost for maintenance
- can be retrofitted to all MAX engines on the market |
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Keith Buffo
Joined: 30 Nov 2007
Posts: 307
Location: United States, Massachusetts, Stoneham
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| Posted: Fri Jan 30, 2009 4:15 pm Post subject: |
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The thing that I didn't get until I saw one in person was how the friction disk worked. This is a better image because it shows those thin lines, which are cuts that go all the way through. So when it spins, those cuts flex open allowing the disk to make contact with the drum.
Any thoughts on what kind of metal that is specifically? What the characteristics of that metal are as for flex, elasticity over time and heat cycles? |
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Chad Stapleton
Joined: 19 Jul 2001
Posts: 4403
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| Posted: Fri Feb 06, 2009 4:14 pm Post subject: |
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| Keith Buffo wrote: |
......Any thoughts on what kind of metal that is specifically?? |
probably the same metal that parilla, Comer, PRD, etc have been using for years.
....... STEEL, .... high carbon & heat treated.
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Chad
"Those of you who think you know everything are annoying to those of us who do !!" |
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Robert Brooks
Joined: 19 Jul 2001
Posts: 2726
Location: United States, CA, Riverside
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| Posted: Fri Mar 20, 2009 9:29 pm Post subject: |
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NEW CLUTCH UPDATE:
We got 5 days on the new clutch.....and it broke...
It broke where the old style would have hada springs.
When we put it on, I was wondering how it was going to keep from breaking where it "bends"
Anyone else have issues?
5 days???
Why am I not excited to go buy a new clutch after 5 days??
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Straightaways are for fast karts, corners are for fast drivers.... |
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Andy Seesemann
Expert
Joined: 16 Jul 2001
Posts: 3289
Location: United States, California, Fullerton
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| Posted: Fri Mar 20, 2009 9:35 pm Post subject: |
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Robert,
Where did you get that clutch? Give it to the dealer.
I have had a couple break and they were warrantied.
A
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Andy Seesemann
FULL THROTTLE KARTING
Orange County, CA.
www.fullthrottlekarting.com
Rotax Challenge of the Americas
www.rotaxchallenge.com
WKA District 10 Trustee
www.worldkarting.com
Really Good Guy. |
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Kasper Kowalski
Joined: 19 Dec 2007
Posts: 30
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| Posted: Sat Mar 21, 2009 2:59 am Post subject: |
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I'm not exactly surprised these clutches are breaking. I've seen a few clutches with a similar design snap shoes off. I had one (not rotax though) let go after only 7 hrs, and saw the remains of a leopard clutch (shoe punched through drum AND clutch cover) after it died as well..
Metal doesnt like to bend repeatedly. |
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Sean O'Connell
Joined: 08 Aug 2008
Posts: 72
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| Posted: Sat Mar 21, 2009 6:15 am Post subject: |
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| Kasper Kowalski wrote: |
Metal doesnt like to bend repeatedly. |
if designed for it, should not be a problem- off the top of my head;
springs bend repeatedly (leaf or coil)... sway or torsion bars.... dzus fastener clips.... paper clips.... golf clubs, |
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Doug Fleming
Joined: 04 Dec 2003
Posts: 1995
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| Posted: Sat Mar 21, 2009 9:27 am Post subject: |
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The current Leopard and the old comer clutch are of similar design or theory. I think it should last under normal use. The old comer clutch would fail from spinning and then getting back on the gas while still rolling backwards. That is very hard on a shoe type clutch like this.
Most of the wear will happen comming out of the pits and pace laps. I have seen a lot of throttle jocky's fry clutchs on a pace laps. Throttle brake, throttle barke for three laps is the worst thing ever.
When during a normal lap the clutch is engaged all the time. So iI think most failures will come from "User input error".
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Doug Fleming
Remember a Diamond is just a piece of coal that did well under pressure
www.flemingmotorsports.com |
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Timothy Skeel
Joined: 01 Mar 2008
Posts: 37
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| Posted: Mon Mar 23, 2009 6:21 pm Post subject: |
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| Doug Fleming wrote: | | The current Leopard and the old comer clutch are of similar design or theory. I think it should last under normal use. |
Doug, they aren't breaking at the end of the slot where the Leopard clutches break, the Rotax clutch has a small radius there to help prevent that. But there is a stress riser, and the shoe material is actually thinnest, at the countersunk bore for the caphead screw used to attach the clutch to the flywheel. I think that is where they are breaking. I've seen 3 fairly new ones broken there, including ours.
Our Leopard clutches lasted a good deal longer before they actually broke, but I have had two of those break as well, just happened after a lot more hours. Springs of all designs will break under stressful conditions.
The new Rotax clutches are an interesting concept, but it looks like they have a design flaw where they attach to the flywheel. |
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Robert Brooks
Joined: 19 Jul 2001
Posts: 2726
Location: United States, CA, Riverside
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| Posted: Tue Mar 24, 2009 8:47 am Post subject: |
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| Quote: | | But there is a stress riser, and the shoe material is actually thinnest, at the countersunk bore for the caphead screw used to attach the clutch to the flywheel. I think that is where they are breaking. |
Yup, that's where our's broke as well.... after 5 days. The driver did not spin out, go off course, or do anythying other than normal on track sessions..
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Straightaways are for fast karts, corners are for fast drivers.... |
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Bob Phillips
Joined: 23 Sep 2004
Posts: 443
Location: United States, California, Porterville
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| Posted: Tue Mar 24, 2009 10:12 am Post subject: |
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Yea Robert. But knowing your driver and what is normal. LOL
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Bob Phillips
Any view expressed here is soley my personal view |
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Jeff Stamper
Joined: 18 Dec 2008
Posts: 1415
Location: United States, Illinois, Plano
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| Posted: Tue Mar 24, 2009 1:28 pm Post subject: |
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Can you use the new gears with the old clutch ? Just curious if I put a new one on and its breaks, can I use the old one. Just a thought, dont know much about the subject
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Andy Seesemann
Expert
Joined: 16 Jul 2001
Posts: 3289
Location: United States, California, Fullerton
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| Posted: Tue Mar 24, 2009 2:11 pm Post subject: |
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Yes.
You may use the new steel gears with the old clutch, but you may not use the old style plastic gears with the new clutch.
A
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Andy Seesemann
FULL THROTTLE KARTING
Orange County, CA.
www.fullthrottlekarting.com
Rotax Challenge of the Americas
www.rotaxchallenge.com
WKA District 10 Trustee
www.worldkarting.com
Really Good Guy. |
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Robert Brooks
Joined: 19 Jul 2001
Posts: 2726
Location: United States, CA, Riverside
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| Posted: Tue Mar 24, 2009 2:35 pm Post subject: |
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Andy... You CAN use the old style clutch with the new steel gears, but would it be Rmax Legal?
Bob, thx, But that was too easy a set-up...See ya Friday...
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