scoobyis2cool
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| posted on 26/10/05 at 05:31 PM |
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Overrun? Coming off cam?
I've heard these terms mentioned enough times before so I figured it was about time I asked the question - what do they mean exactly?!
Cheers,
Pete
It's not that I'm lazy, it's that I just don't care...
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JoelP
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| posted on 26/10/05 at 05:35 PM |
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i believe overrun is when you come off the gas at high revs, ie the engine is being pushed round with the throttle fully or partially closed  Might
be wrong though! 
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flak monkey
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| posted on 26/10/05 at 05:45 PM |
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Overrun - When said of a vehicle engine: to slow down in response to a reverse torque transmitted through the gears from the wheels.
Sera
http://www.motosera.com
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phoenix70
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| posted on 26/10/05 at 06:17 PM |
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Overrun is when you come off the power and the wheels begin to slow the engine, ie the wheel speed is greater than the engine speed ie the wheels are
over running the engine.
Coming off Cam - Camshafts are designed to produce the max power/torque at a particular rev range. to be off Cam is that your engine is reving below
the the optimum revs for the camshaft, therefore not producing the maximum power (it really to do with the timing of the valves and the
opening/closing times.. the duration)
Scott
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iank
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| posted on 26/10/05 at 06:38 PM |
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'Coming off the cam' is normally used when talking about very 'peaky' full race cams. These often have power graphs that look
like mount everest. You get massive power, but only over a very small band of revs, either side it drops off so quickly that if you get a gear change
wrong you end up falling off the peak and losing most of your power, usually when you really need it. 
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scoobyis2cool
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| posted on 26/10/05 at 07:11 PM |
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Thanks guys, I thought that was what they meant (honest guv! )
Pete
It's not that I'm lazy, it's that I just don't care...
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