Quote:
Originally Posted by Tom Vaught
I actually took some Intake Duration out of Jimmy Keen's Vortech Supercharged 347 cid Ford Engine because he was able to make the required rpm with less intake duration and as Travis mentioned ONCE the cylinder is full it is full. We were paying for the increased duration in other ways that was hurting our track performance. Jimmy was running a Power Glide. This is when we moved from the heavily ported "Street Heat" heads to the lightly ported Yates heads.
Tom Vaught
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REALLY GOOD statement, Tom. Too much duration will hurt an engne more than not enough, from what I have seen. Especially true with a turbocharged combination. Especially with a supercharged combo, sometimes a little more cylinder head will allow you to make changes to valve timing events to improve performance on the track. This again goes back to our earlier statements about what a blower engine wants for an ideal cylinder head (increase in engine speed and decrease in blower overdrive) and what a turbocharged engne wants. They are definitely different.