In a message dated 7/5/03 3:03:13 PM Pacific Daylight Time, gln@worldpath.net
writes:
> Last week I posted a question regarding the centering of some roller rockers
> I purchased from TSI and with the help of the list and Ted at TSI I got
> straightened out... my next question is, I've set the lash as follows
intake
> .018 and exhaust .020. My advertised net valve lift is .305" and is
accurate
> because I had the cam verified on a Cam Doctor , my roller rockers are
> suppose to be 1:55 to1 which I understand are actually 1:52 to 1. So with
> basic math I should have a net valve travel of .446 on the intake and .443
> on the exhaust but I dialed out each and am only getting .428 intake and
> .424 exhaust. I know rarely do you get these calculated numbers due to
valve
> train deflection and rocker manufacturing tolerances but my actual seems
> really low. I spent quite a bit of money to get higher lift numbers with
> these rockers and by my calculations I'm only getting @ 1:46 to 1 which is
> damn close to stock!!!
> I'd like the input of those that know more than me, so please let me
> know what you think, on or off list.
>
> Thanks Nick Gemas
>
Nick, you need to account for the valve lash. If you add the intake lash to
your measured intake lift you'll see that you get exactly what you expected.
The same for the exhaust. Your numbers sound good to me.
Jeff Dewey, Secretary
Richmond Triumph Register
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