UK Karting - Notice Board (2-Stroke Karting) : Re: max. rpm...?

Notice Board (2-Stroke Karting)

Re: max. rpm...?
Posted by 'Hi99' on 29 Dec 2009 @ 17:19

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Hi99Joined: April 2008
Total Posts: 1
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I'm sorry Dino, but just stating that a crank is in 2 halves, which is pretty obvious, doesn't provide much of a reasoned explanation behind your "fact"

There is also a big difference between the change in load an engine experiences when throwing a chain, and blipping the throttle on a stand. If a chain is thrown (clear) then the result is absolutely no load, and risk of over reving the engine is extremely high - no load, full throttle, racng situation, etc. At least on a stand there is the inertia of the wheels, axle, etc to provide some resistance.

Also, Zip's own guidelines for setting up a Comer W60 Tryton carb advise to lean the high side needle until the engine reaches 12,200 rpm on the stand (unloaded) - peak revs for the W60.

Personally I don't subscribe to reving the nuts off an engine on the stand, but plenty of other people seem to, including the mechanics from big teams. It's very noticeable at tracks like Kimbolton where they don't mind engines being reved in the engine start bay. I've not heard anyone complain of a crank out of balance as a result...

I'm happy to be enlighted otherwise!

Message Thread:

max. rpm...? by 'mark269' (28 Dec 2009 @ 19:23)

Re: max. rpm...? by 'Cadet49Dad' (28 Dec 2009 @ 22:08)

Re: max. rpm...? by 'cos22' (29 Dec 2009 @ 0:29)

Re: max. rpm...? by 'DINO' (29 Dec 2009 @ 8:33)

Re: max. rpm...? by 'Hi99' (29 Dec 2009 @ 9:24)

Re: max. rpm...? by 'DINO' (29 Dec 2009 @ 11:41)

Re: max. rpm...? by 'Hi99' << You are here!

Re: max. rpm...? by 'QuickOldTimer' (29 Dec 2009 @ 18:33)

Re: max. rpm...? by 'Hi99' (29 Dec 2009 @ 18:50)

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