Quote:
Originally Posted by Pont428
He definitely will eat that one JC. They will do push rod in first to see what power it makes. Air is Air, it doesnt know what RPM the engine is. Why dont we just wait and see? I remember when everyone said a 4.5 bore wasnt possible, and here you are JC! Lynn is doing close to 4.6 bore for me.
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And fuel is fuel, it doesnt know what the rpm of the engine is either...
Besides dealing with the inertia differences of those two, there are other factors that affect both in how they behave and arrive in the cylinder in a good homogenous mix ready to burn. Its not just csa and adequate airflow thru the lift curve.
I think Tony was smart to move the pushrod out of JC's port... Not that he couldnt have made more space around the pushrod (or a port divider) for same csa...
One just cant divide the port part of the way or all the way from intake plenum to the valve seat without consideration of ALL factors that need to occur or could occur. Then not forget the factors that occur between the throttle and the valve, across the valves during overlap and things that are occuring before and after valves open and close on both sides of the head.
JMO but for JC's build requirements I think Tony chose a way to meet the build requirement and avoid alot of additional and costly R+D. Job well done!
This proposed 406 with 2.7 to 3.0 hp per ci mentioned earlier... if it is tried with the pushrod through the port there will be air/fuel issues to address differently than a "conventional" open port. (maybe direct cylinder injection helps???)
If the pushrod is run outside the port its going to take block changes among other things to build a valvetrain that can hold up to the rpm you are going to turn a 406 to the amount of rpm required to move all the air it would take for 2.7-3.0 hp per ci.
Seriously, good luck with this. Thats a heck of a goal!
Please understand Im NOT anti RAV... I think its a very cool choice for street, street-strip, serious brackets, even high level type builds to a point... but I think there is very good reason why its not in use in Pro-stock.
Lots of great talent amongst us... it would be awesome if "we" (as an affiliated group of Pontiac diehards) showed the other brand guys the way...