 Vacuum advance ports...which one to use on (V8) carb? |
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| computers4kids |
 Dec 4 2008, 11:54 PM
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#1
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Love these little cars!  Group: Members Posts: 2,443 Joined: 11-June 05 From: Port Townsend, WA Member No.: 4,253 Region Association: None  |
I have the carb below on my chevy powered 914. The carb has two different types of vacuum ports...I don't understand the difference. Could someone give me a quick education on the differences and which one is better to use.
Much appreciated, Mark Attached thumbnail(s) 
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| Dr. Roger |
Dec 5 2008, 02:11 AM
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A bat out of hell. Group: Members Posts: 3,944 Joined: 31-January 05 From: Hercules, California Member No.: 3,533 Region Association: Northern California |
full time means below the throttle plate
ported means above the plate, or... only get vacuum under part or full throttle. but then you've got to verify which dizzy you are using. vacuum advance or retard... (IMG:style_emoticons/default/wink.gif) |
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| marks914 |
Dec 5 2008, 05:29 AM
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Senior Member Group: Members Posts: 845 Joined: 9-October 04 From: the motor city Member No.: 2,912 Region Association: None |
You want to use ported, that gives you the vacuum advance when you need it, at light-med throttle, then the mechanical kicks in. If you run it on the manifold side, it will be advanced at idle, and then the timing will drop when you open the throttle, the mechanicals will kick in at their preidetermined time, later.
Mark |
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| computers4kids |
Dec 5 2008, 07:57 AM
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#4
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Love these little cars! Group: Members Posts: 2,443 Joined: 11-June 05 From: Port Townsend, WA Member No.: 4,253 Region Association: None |
Thanks...that makes sense. I'm running the GM HEI distributor.
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