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  #16 (permalink)  
Old 08-07-2010, 01:31 PM
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Quote:
Originally Posted by sqzbox
Can't find the thread. Can you link me up or something?
Here's one of many- Port or Full time vacuum
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  #17 (permalink)  
Old 08-07-2010, 04:36 PM
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Quote:
Originally Posted by cobalt327
Here's one of many- Port or Full time vacuum
That's the one best info and links is in the last 3 or so pages

All my street/strip performance engines get full manifold vacuum advance... I'm not about to throw 2-4 mpg, cleaner idle and cleaner plugs out the window just because I don't want to take the time and effort to taylor the mechanism to the engine.
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Old 08-07-2010, 05:26 PM
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Ok, here's an update. I just changes the weights and springs out. Using the light springs I am at 10deg initial and another 12deg with the mechanical. I am around 42deg altogther at 3000rpm. Shouldn't I be getting more on the mechanical than 12deg? The instruction sheet showed the light springs giving close to 20deg advance. Any reason why I am getting 12deg? Could the center weight be causing it? It is slightly smaller than the previous one.
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Old 08-07-2010, 06:08 PM
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Quote:
Originally Posted by stfinney
Ok, here's an update. I just changes the weights and springs out. Using the light springs I am at 10deg initial and another 12deg with the mechanical. I am around 42deg altogther at 3000rpm. Shouldn't I be getting more on the mechanical than 12deg? The instruction sheet showed the light springs giving close to 20deg advance. Any reason why I am getting 12deg? Could the center weight be causing it? It is slightly smaller than the previous one.
I guess I don't understand 10 initial plus 12 in the mechanical mechanism is 22, how are you getting 42?? Leave the vacuum advance out of the picture right now.
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Old 08-07-2010, 07:37 PM
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I am getting around 20 degrees advance from my vacuum. Yeah, my total timing is only around 22. I am not sure how to make the mechanical advance go higher.
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Old 08-08-2010, 02:02 AM
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I say its the springs in the distributor as well. Just keep playing with it and you will get it eventually.
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Old 08-08-2010, 05:58 AM
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Put the stock weights and center cam plate back on and only use the springs from the advance curve kit if you are using weights that came with a kit. Most kit weights are poorly made compared to factory. Weights don't have to be matched pairs either, you can mix and match different tension springs to further fine tune it.
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Old 08-08-2010, 02:16 PM
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The ones that came out were not stock ones. They were changed out years ago when it was on a 1975 350 motor. They didn't keep the stock pieces, just the replacement ones. I will keep trying different things to it and see.
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Old 08-08-2010, 04:40 PM
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Hey, I read that you can grind a little off the center weight to gain a little advance. Has anyone done that and does it actually work?
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Old 08-09-2010, 07:14 PM
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Nevemind, I tried that little trick and it worked!! I am now getting 20deg of timing on my mechanical...YAY. Still needs some fine tuning, but runs alot better. Thanks!
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