Hello Bob,
It sounds like it is running a bit lean in the mid range. Try raising
the engine speed to 2500 and setting the mixture there. A quick test would
be to cruise at 2500 and pull the choke out just a little. I normally set
the carb mixture at 2500 and let the idle take care of it's self. If the mid
range is good and the idle is rich you can set the needles out a few
thousandths of an inch. While this does have some effect overall it effects
idle
primarily.
keith
In a message dated 6/16/2011 3:42:03 P.M. Pacific Daylight Time,
rksmith46@hotmail.com writes:
hi keith, im working on a 69 2000, that belongs to a friend.
it idles, ok, and pulls resonably well, from idle to 6k rpm.
the problem is, part throttle cruising at 2.5k--3k rpm.
it sounds like the engine is missing a little, and the throttle
response is kind of flat. 3200-3500 rpm or above, the throttle
responds better, more like MY roadster. fuel press. is 4-4.5 lbs.
ive ckd, and raised the float level 2 mm., ckd, cleaned points,
tried another condenser, all no help. point dwell is pretty steady
when reving engine. the timing is: 15 btdc, vac.disc., raising to
about 30 deg. at 2500-2800 rpm. total mech.adv. is 35-36 deg.
ive synchonized the carbs at idle, and with throttle. ive got
the mix. set where it idles good, hot. ive messed with su's
for many years, but im stumped on this one.
if you have any ideas, please call or email me.
thanks, bob smith, ohio 614 418 9911
p.s. i changed the cam timing, when i first had this
problem. it was almost 1 cam toothe retarded. i changed
the cam forward 1 toothe, and now it is just a fraction on
the advance side, much closer to being correct, than before.
the engine seemed to pull better in the lower rpm range,
but i still have the part throttle problem.
=
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