Quote:
Originally Posted by steve25
The question is how much power do you want to make and at what rpm do you want peak torque and hp to be attained at?
Basically with any motor when where talking airflow levels at a 28" depression you will need 4 Intake cfm for every 1 hp you want to make per cylinder.
Really well worked out and thought out combos can make 1 hp per cylinder with just 3.59 cfm at the rpm of peak hp.
Also you need a certain amount of minimum port area also to hit your rpm goals of peak torque and hp and the Cam you pick and it's centerline and overlap also is a big factor in this.
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May i ask where you got 3.59cfm from? That's 100hp shy of what mine made. Guess i have never seen this cfm per hp per cylinder before.
But anyway, i agree with target hp and target rpm need to be know. Imo screw cfm, if you get the correct size port for the ci and rpm then usually the rest falls into place somewhat