Olds 215 Initial timing setting with a non-stock cam
#1
Olds 215 Initial timing setting with a non-stock cam
Having problems getting a smooth idle from my rebuilt Olds 215 with
a slightly larger camshaft. Vacuum gauge shows steady 12 - 14 reading
in the area that says "late ignition timing". The timing is already an inch
ahead of the timing tab on the engine into the area of (no numbers).
Max on the tab is 10 BTDC.,and when I advance beyond that the vacuum
gauge still remains in the 12 to 14 range with rising idle speed.
Is there an initial setting that goes beyond stock when using a larger
cam? I can't believe I can advance it much farther without causing
damage at higher engine speeds.
Returned timing back to approx.20 to 25 degrees (guessing). Adjust-
ed idle screws and speed,and now have a slightly rough idle at about
800 rpm. What force is at work here?
a slightly larger camshaft. Vacuum gauge shows steady 12 - 14 reading
in the area that says "late ignition timing". The timing is already an inch
ahead of the timing tab on the engine into the area of (no numbers).
Max on the tab is 10 BTDC.,and when I advance beyond that the vacuum
gauge still remains in the 12 to 14 range with rising idle speed.
Is there an initial setting that goes beyond stock when using a larger
cam? I can't believe I can advance it much farther without causing
damage at higher engine speeds.
Returned timing back to approx.20 to 25 degrees (guessing). Adjust-
ed idle screws and speed,and now have a slightly rough idle at about
800 rpm. What force is at work here?
#2
After some work with the timing and idle speed screws,I've readjusted the
timing to approx. 7 degrees BTDC. Turned up the idle speed screw,and
readjusted the idle bleed screws at the base of the carb.
Also cleaned and installed a set of hotter spark plugs because the others
where carbon fouled from too rich choke setting running too long.And
long periods of idling while checking timing,idle speed,ect. Engine runs
better and now has a slight lope due to the new camshaft.
It appears that I was on the wrong track with the advanced timing
settings I was working with.
timing to approx. 7 degrees BTDC. Turned up the idle speed screw,and
readjusted the idle bleed screws at the base of the carb.
Also cleaned and installed a set of hotter spark plugs because the others
where carbon fouled from too rich choke setting running too long.And
long periods of idling while checking timing,idle speed,ect. Engine runs
better and now has a slight lope due to the new camshaft.
It appears that I was on the wrong track with the advanced timing
settings I was working with.
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