<VV> LM ignition/distributor timing
Sethracer at aol.com
Sethracer at aol.com
Tue Jul 1 00:41:34 EDT 2008
In a message dated 6/30/2008 9:02:20 PM Pacific Daylight Time,
dougbee at comcast.net writes:
Any ideas what I should be looking at? what is causing the vacuum advance to
work at idle?
Doug Barneck
back from the national convention and having to work on my son's corvair some
more...
The carbs are set too far open. That exposes the transfer port and the vacuum
port and it pulls the vacuum advance open. You should be idling strictly on
the idle circuit. Again - You should have no vacuum advance at idle. Try doing
this. First, disconnect and plug the hose from the RH primary carb to the
distibutor. Then disconnect the throttle link to the left side primary carb. (This
is in the shop manual - you can just follow it there.) Then adjust both
primary carb idle speed screws so the throttles are just closed - make sure the
linkage is not pulling them open and chokes are not changing the throttle stop,
pulling the throttle open. Then open each idle speed screw about 1.5 turns.
Then try starting the motor. If it doesn't run well, bring the idle up a ways
(adjust both screws the same amount at this point) and try to balance the two
primaries. Do you have a Unisyn? It makes balancing the two carbs much easier. If
not you can use a vacuum gage on the carb ports that normally pull off the
chokes - those ports are connected directly to the manifold vacuum. You are
trying to measure the amount of airflow through each carb and adjust it to make it
equal on both sides. When you have equal flow, adjust the screw on the left
side throttle link to "Just" engage the carb. Then adjust the mixture screws to
maximize the idle RPM - without touching those idle speed screws. Once this
is done check to see if you have any vacuum coming through the hose from the
carb to the distributor. If you still have a vacuum there, you will have to try
to get the idle speed down. - Seth Emerson
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