Scott,
The cam lobe determines when the valve opens ( comes off the seat) independantly of
the rocker arm ratio for all practical purposes. If one were to measure the opening
point in 1/1000 of a second you may be able to detect the 1.7 opening slightly before
the 1.6 but this A) would be very difficult to measure and B) be of no consequence to
engine performance.
Yes, I did read this before I posted it and I did not contridict myself.
If you don't believe myself or Sean, contact any reputable cam grinder, Comp Cams,
Crane, Crower, etc. and ask them.
KW
The 1.7 rockers will open at a faster rate and open further off the seat but this has
to be performed in the same amount of time as the 1.6 rockers.This would make the 1.7
more susceptible to valve float at a lower RPM.
svieth@ameritech.net wrote:
> > Sorry,
> > But the cam lobe determines duration. duration @ .050 will be increased slightly
> > becausethe valve opens at a higher rate, but the amount of time the valve is
> > open (off the seat), measured in crankshaft degrees remains constant regardless
> > of the rocker arm ratio.
>
> See? This is part of my frustration. You say that "duration...will
> be increased slightly" and then you say "the amount of time the valve
> is open .... remains constant."
>
> Did you read this before you posted it? It directly contradicts
> itself!!!
>
> Which is it?
>
> Will the duration at .050" increase slightly or
> will the amount of time the valve is off the seat
> change?
>
> God this frustrates me.
>
> -Scott :^(
>
> "No, Homer, very few cartoons are broadcast live. It's a
> terrible strain on the illustrator's wrist."
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