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Old 03-09-2009, 02:59 AM   #1 (permalink)
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carb problems 3SF

I have a 3SF engine carb type i had just fixed the distributor oil seal and orings and timed the car at 5degs everything was ok idle was at 800 the car had good response with the throtle then i ran it on hi rev aroung 5000 to 6000 then the idle went up to 2000 and did not go down i looked at the timing it was still in 5deg then went i turn of the engine it will choke up for a few seconds then pressure would be released in the carbs. when i started the car again the rpm is still in 2000 / would also like to know how to set the octane dial in the distributor / or a diagram of the carbs / help please / i will post up pics of the engine
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Old 04-11-2009, 12:51 PM   #2 (permalink)
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Hi, Once the automatic choke warms up and kicks out, the idle adjusting (stop) screw and idle mixture screw control idle speed, If the timing is staying the same. so you might want to adjust the idle (stop) screw to obtain a lower idle and then adjust the idle mixture screw to obtain a smooth idle and then re adjust the idle stop screw to get the idle speed right. On my 1969 Corona it was hard to see the idle stop screw as is down low and under the linkage. The idle mixture screw goes in on an angle in the base body flange. Your timing should change as the engine is reved due to the vacuum and mechanical advance. Normally the octane selector is set in the middle of the 3 rings on it when you time the motor to factory spec with a strobe light and then you can turn it to retard it (CCW) if you hear pinging or spark knock. you will see the timing retard as you hold a strobe timing light and turn the octane selector CCW.
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