John:
You are corrected. "Advanced" timing means the valves open
earlier relative to the crank position. I don't recall which way the
crank and cam turn, so I am taking your word for it that the crank and
cam turn clockwise. Assuming that is correct, then yes the cam sprocket
should be rotated clockwise relative to the crank.
BTW, you said "advance a few degrees". If GP has a specific
number, then follow their recommendation. If they do not give you a
specific number, 3-4 degrees is a good place to start. Also remember
that the advance is relative to the CRANK. So that means that a 4 degree
advance AT THE CRANK means 2 degrees AT THE CAM since the cam is
rotating half as fast as the crank.
Say for example, there are 72 teeth on the cam gear. Each tooth
is then 5 degrees, which translates into 10 degrees at the crank. So I
would say advance the cam 1/2 tooth and no more.
Vance
-----Original Message-----
From: 6pack-bounces+vance.navarrette=intel.com@autox.team.net
[mailto:6pack-bounces+vance.navarrette=intel.com@autox.team.net] On
Behalf Of John North
Sent: Thursday, March 13, 2008 10:12 AM
To: Triumph 6 Pack
Subject: [6pack] Cam timing
Doing this for the first time, so forgive the basic question... The
Goodparts instructions for the GP2 say to advance a few degrees for
low end torque, which is what I want to do. I see how the sprocket
can be used to adjust half a tooth... Am I correct that "advance"
the timing means moving the cam sprocket so that the valves open
earlier, which if my mental geometry is correct means turning the cam
a hair clockwise and hooking up with the offset holes leading.
Any help appreciated.
John North
_______________________________________________
Support Team.Net http://www.team.net/donate.html
6pack@autox.team.net
http://autox.team.net/mailman/listinfo/6pack
http://www.team.net/archive
|