Mike

Maybe a tec at the "IRS" could come up with a suggested size for us.

In my younger days (early 70's) I helped out prepping the Edinburgh Indiana National Plymouth Trouble Shooting Champions. These kids were very good usually getting the car up and running in 30 minutes or less. They were also pretty cocky. One day I took the carburetor off made a gasket with two 1/2" holes in it and put it back in place. Well they found and fixed the usual problems and took it for the mandatory test drive. They came back from that ride and their jaws were way way down. It ran great but it would only go 25 miles per hour.

Peak torque is achieved at maximum Volumetric Efficiency? That is The reason old MC Performance is building all those ram air tubes and air breathers assemblies. We can change the point that an engine achieves it's maximum "VE" by making those stacks longer or shorter. Peak Horsepower however is achieved well beyond the peak torque speed. The motor finally just falls on it's face in the case of the old 2 valve motors, now these crazy motorcycle motors just don't seem to know when to quit. They keep going usually until Something just breaks.

I am not sure but I think IRS would probably want about a one inch hole? That size hole would probably also affect peak torque. Like Built in traction control.

Honest Dad himself