Au Contraire, mon ami
Increasing the rr does indeed increase the overlap. While the
starting/stopping point remains the same, the AREA UNDER THE CURVE
increases by virtue of the faster rates for the valves. Think of it this
way: draw an equilateral triangle. The base defines the LENGTH of the
overlap period, but the area inside the triangle is the SIZE of the
overlap. Now double the height of the triangle without widening the
base. The area inside DOUBLED, but the base stayed the same size.
This is how rr affects overlap. The length of the overlap period
stays the same, but the distance the valves are open during the overlap
period is greater. Thus a rougher idle.
Vance
Vance Navarrette
Cogito Ergo Zoom
I think, therefore I go fast
-----Original Message-----
From: Sally or Dick Taylor [mailto:tr6taylor@webtv.net]
Sent: Monday, June 23, 2008 10:38 PM
To: Navarrette, Vance
Subject: RE: [6pack] GP2 cam idle characteristics
Interesting. The lope you experienced sounds like something that
would be the result of a cam with too much overlap, but installing the
higher rrs doesn't really change WHEN the cam comes on or off, or
increase the o'lap. It should only increase the lift at the valves.
Increasing lash would smooth out the idle, but if you went more than
what the cam mgf. called for, then there's still a riddle here. I assume
that "heat" had not as yet come into the picture? So far, I'm getting
mixed results from others who are in the "business". More coming, as I
wade thru this! I really enjoy these types of discussions!
DT
-----Original Message-----
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