A model of this is need for explanation which goes like this. There are two answers to this one is the compression ratio needs to be raised to force more work out of a thinner mixture or going the other way a cam with less ramp is needed to get the intake seated sooner so more of the inducted mixture is kept in the cylinder.Īnother issue is overlap which plays with the concept of Lobe Separation Angle (LSA). The slower the engine turns say at cruise the worse this condition becomes which manifests itself as a sag in the torque curve probably right where you need more not less. These are old designs with lots of ramp this keeps the intake off the seat allowing the rising piston to blow inducted mixture back into the intake thus lowering the amount left to be compressed the result is low compression pressure for the compression ratio. Cam 1 comes the closest but still not there.
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