John, I don't think it is the cam. I installed a GP2 last winter (9.6:1 cr)
and the engine will idle happily at 900 rpm and will pull willingly in all
gears well below 2500. I still have a few other teething problems to sort out
with the carbs (3xdcoe) but I don't think the GP2 is that hairy. Your problem
may be as simple as needing richer needles and/or a third Stromberg to get
more fuel into the motor.
Stan
-----Original Message-----
From: 6pack-bounces+stan.foster=hp.com@autox.team.net
[mailto:6pack-bounces+stan.foster=hp.com@autox.team.net] On Behalf Of John
North
Sent: Monday, August 04, 2008 8:24 AM
To: Triumph 6 Pack
Subject: [6pack] Missing under load
Tuning following my engine rebuild... When I put the pedal to the
floor in any gear, the engine misses badly, and smooths out when I
back off the throttle. This is especially true at 2000 rpms or less.
Once over 2500, it accelerates pretty well, still misses
occasionally.
I have 9.5:1 compression, Goodparts GP2 cam, smoothed ports. I am
running with stock ZS carbs.
I have checked timing, points, plugs multiple times. Have advanced
and retarded timing a few degrees. Replaced wires, rotor, dizzie cap
with known good ones. Changed carb needles for B1E. All these with
little effect. Dashpots have 5/20 oil in.
Vance called the GP2 a hairy cam, as I recall, and I am starting to
wonder whether that might be the issue. Maybe it needs to run over
2500 rpms...
Any other experiences out there or suggestions for where to go from here?
John North
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