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-   -   Cubic inch eats up duration???? (http://forums.mustangworks.com/showthread.php?t=49773)

Dark_5.0 05-30-2007 10:35 AM
Cubic inch eats up duration????
 
I have an engine building book that states that every 50 cubic inches eats up 8 duration.

Can anyone explain this????

tmoss 05-31-2007 06:19 PM
Re: Cubic inch eats up duration????
 
The cubic inches grow faster than the intake valve does, so a larger engine needs the added duration to keep a good cylinder fill as it takes longer than when the valve to ci ratio is smaller.

Dark_5.0 05-31-2007 08:15 PM
Re: Cubic inch eats up duration????
 
Quote:
Originally Posted by tmoss (Post 331430)
The cubic inches grow faster than the intake valve does, so a larger engine needs the added duration to keep a good cylinder fill as it takes longer than when the valve to ci ratio is smaller.
After reading that it seems like it should have been obvious. I couldnt figure it out for some reason though.

That is some good info to know when making a cam choice.:cool:


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