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Clutch spring size question

Clutch spring size question

Old 11-04-2010, 10:06 AM
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I have a question about Mugen spring sizing. I have an older but fast Mayhem that I run on a decent size oval. Track is smooth, packed and dusty. I'm using a 3 shoe clutch and was wondering which spring size would be best. We're only out of the throttle for a short time through turns. I need new shoes & springs. Should I get the .9, 1.0, or 1.1 Mugen? I haven't long gotten into the hobby from nitro boats. Spring sizing is one thing I haven't experienced yet.
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Old 11-04-2010, 10:19 AM
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Id ask others at the track what they are running. But as a rules, larger springs engage later or at a higher rpm, lighter springs at a lower rpm. You might find that a few guys are running one 1.1 spring and 2 1.0 spring.
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Old 11-04-2010, 10:39 AM
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Originally Posted by Landmines View Post
I have a question about Mugen spring sizing. I have an older but fast Mayhem that I run on a decent size oval. Track is smooth, packed and dusty. I'm using a 3 shoe clutch and was wondering which spring size would be best. We're only out of the throttle for a short time through turns. I need new shoes & springs. Should I get the .9, 1.0, or 1.1 Mugen? I haven't long gotten into the hobby from nitro boats. Spring sizing is one thing I haven't experienced yet.
Thanks
If you don't need acceleration out of the turns, a soft spring will allow the motor to pull.

If you need the snap out of the turns, a heavier spring will be better.

Soft springs=Slipping clutch in a car @2500 RPM
Hard springs=Sidestepping the clutch at the same 2500RPM.
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Old 11-04-2010, 10:43 AM
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As a general rule you want your clutch set up for the track surface and the engine you run. If your track is loose and your engine has Gobs of low end torque then if you set up your clutch to be too aggressive you will more than likely get allot of tire spin which equals wasted power and wasted fuel. If your springs are too light there will be to much slip before your bell engages your spur. As racer 37 said talking to the other racers is your best bet as there may be preferred clutch set ups for dirt oval and the track you race at. The examples I gave are for general off road and may change drastically for oval racing.
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