INTERNAL ENGINE MODIFICATIONS Valvetrain |Heads | Strokers | Design | Assembly

Duration placement

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Old 08-24-2008, 08:10 PM
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Default Duration placement

Right now my 216/220 is plenty enough. But later down the road i'm going to go bigger.
I understand the jist of duration vs lift and the placement of the curve. but what I was wondering is the difference of the curve for say a 216/220 .525 .532 to that of Superado's 218/230 .600
Anyone have any good dyno graphs for a huge duration gap like that?
I'd like to see some graphs of various Durations and lifts.
Hopefully enough to direct others too if they need help choosing.

What would a 212/224 cam curve look like?

Please, Enlighten me.
Old 08-26-2008, 06:52 PM
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Bump.

My main interest is the difference in a close duration such as 216/220 compared to a wide duration 212/224. whats the advantages/disadvantages of having such gapped in/ex durations.
Old 08-31-2008, 01:00 AM
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I believe its kind of hard to compare two different cams like that. Mainly because the lift is so much taller on the second one listed. I could be wrong though.

How ever when it comes to asking about the effect of the spreading the duration further apart in relation to valve lift and how spreading it further apart like that In relation to valve lift would effect the power out put, I am suprised that no one on this board could better explain it.
Old 08-31-2008, 03:36 AM
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big splits are for forced induction or to make up for an inefficient exhaust from what i've seen. i'm surely not a cam guru and don't pretend to be so i'll leave this up to the experts.
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