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Bill Sherwood
Forums Junkie

Location:
Brisbane / Gold Coast
Registered:
May 2002

Re: Camshaft Design and Optimisation

Wed, 05 October 2005 07:07

Matt-itude wrote on Wed, 05 October 2005 13:57

Hey all,

I am doing a uni project on the design of a racing camshaft profile.

The requirements are 290 deg crank shaft duration @ 1.27mm lift and maximum valve lift required of 9mm. The engine has a max rpm of 13000 rpm, all using a flat faced follower.

Is it safe to assume, that the best performing camshaft profile would be one that opens as quick as possible to 9mm lift and then holds it for as long as possible before closing as quick as possible.

All while keeping the follower motion under continuous acceleration and trying to avoid infinite jerk (derivative of acceleration) and to avoid issues like valve bounce and avoiding critical contact stresses?

I would assume this leads to an asymmetrical cam profile. Is there any real problem with this, and or are are any of my assumptions incorrect?

Thanks for any educated advice you can give me
-Matt

Not problems at all. The cam is the easy part, tailoring the valve spring to make it work is the harder part!
That's were the jerks come in to play (yes, I know what 'jerks' are) and hence with that amount of lift, duration, and revs you may well have to look at dual interference valve spring to provide an inherent damping quality to the spring.

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