SoCal Jet Boats
Discussion => The No Wake Zone => Topic started by: eliminator18 on March 15, 2012, 07:15:27 AM
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How many of you guys use the Vaccume advance on your distributor to carb? My engine is capable of doing so, but the privious owner capped them off? Would I see any difference with it hooked up, or should I leave it alone?
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I dont use it but my dist. does not have it
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How many of you guys use the Vaccume advance on your distributor to carb? My engine is capable of doing so, but the privious owner capped them off? Would I see any difference with it hooked up, or should I leave it alone?
IMHO it will hurt performance...
I don't really even know why they call it a vacuum "advance"...A marine engine, especially a jet makes almost no vacuum at all at wide open throttle or even when at a 3500 RPM cruise. The way a vacuum advance works on a car is when the vehicle is cruising down the freeway the engine has a fairly high vacuum signal, this signal then advances the timing improving fuel economy and generating a small amount more HP, once the throttle is increased the vacuum signal drops and retards the timing a small amount to prevent detonation.
Leave it disconnected or better yet find an eliminator kit and set the timing for high RPM, not low...
GT
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If its GM HEI, get a vacuum adv lockout plate
http://www.speedwaymotors.com/Vacuum-Advance-Lock-Plate,7317.html (http://www.speedwaymotors.com/Vacuum-Advance-Lock-Plate,7317.html)
and a recurve kit
http://www.speedwaymotors.com/HEI-Advance-Curve-Kit,740.html (http://www.speedwaymotors.com/HEI-Advance-Curve-Kit,740.html)
Thats all I got
Daniel
Mash on it
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On every gm style hei I have i never use it but I do change the springs on the mechanical advance to a lighter spring. When using the lighter springs I drop the timing to 12* at idle opposed to 15* with the firmer springs.
Fat fingered from the phone- Corey