Tim Roller wrote:
starwolf@bewellnet.com
I was just glancing through the Summit racing catalog and I noticed that
some "chebbies" run a combition of different rocker arms on the same
engine. What I mean is that they run 1.6 on one set of valves, and 1.7
on
the other set. Not knowing which set of valves they put these rockers
on, I
would presume that the 1.7's go on the exhaust side to get rid of spent
gases. I was just wondering if any of you DAK owners had tried or are
using
this kind of combination on their Magnum or pre-Magnum engines and if
this
geomentry is usable on the computer controlled engines and if this
combination was used what did you find as the best combo as to which you
ran the performance(1.7) rockers-intake or exhaust side.
Thanx for any feedback you might have--Maybe I came across a new DAK
performance mod??
Tim, the reason that you increase rocker arm ratios on the intake
or on the exhaust valve is to provide more valve lift and duration
on a symmetrical or asymmetrical cam.
A symmetrical cam design is one with .450 lift Intake / .450 lift
Exhaust.
Asymmetrical cam design is on with .465 lift intake / .475 lift
Exhaust.
Also, when increasing the rocker arm ratio, you will increase your
valve opening duration by 1 - 3 degrees.
So by increasing rocker arm ratios helps put more fuel air mixture
into the motor and also keeping the exhaust valve open longer to
get all burnt feul air mixture out of the motor.
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