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timing question

 
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s19243h
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Joined: 30 Jan 2006
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PostPosted: Thu Sep 21, 2006 2:27 pm    Post subject: timing question Reply with quote

in order for me to get 34 total timing i have to have 20 initial ,how do i get lower initial timing i have a gm hei distributor
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glenn
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junkyarddog
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1982 Oldsmobile Cutlass

PostPosted: Thu Sep 21, 2006 2:29 pm    Post subject: timing Reply with quote

move distributor
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Tyler Bonham
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s19243h
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PostPosted: Thu Sep 21, 2006 2:58 pm    Post subject: Reply with quote

but then i cant keep 34 total
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junkyarddog
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1982 Oldsmobile Cutlass

PostPosted: Thu Sep 21, 2006 3:26 pm    Post subject: timing Reply with quote

I am the smartest on that but in order for that to happen I do believe you need to mess with weights and springs for vacuum advance.
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Tyler Bonham
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s19243h
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PostPosted: Thu Sep 21, 2006 3:30 pm    Post subject: Reply with quote

yea maybe the weights ill try that cause the springs i have now are right on total timing all in by 2500
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junkyarddog
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1982 Oldsmobile Cutlass

PostPosted: Thu Sep 21, 2006 3:52 pm    Post subject: timing Reply with quote

yeah last time i had street car the distributor I ran was perfect so no tinkereing. My drag car is locked on 34 degrees with crank trigger. Street car I ambuilding now has locked out distributor too. Tming will be control by MSD digital 7
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Tyler Bonham
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af2
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1933 Willys Coupe

PostPosted: Thu Sep 21, 2006 5:12 pm    Post subject: Reply with quote

The first thing I would do is make sure the T.D.C. is correct on the balancer. It only took one time for me to double check after trying to get a motor to run right then finding the balancer had spun 15 degrees in the elastomer.
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junkyarddog
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1982 Oldsmobile Cutlass

PostPosted: Thu Sep 21, 2006 5:19 pm    Post subject: timing Reply with quote

Yes, listen to af2
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Tyler Bonham
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Paul P
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1971 Chevrolet Chevelle

PostPosted: Thu Sep 21, 2006 5:40 pm    Post subject: Reply with quote

Moroso makes a kit with new weights and a selection of springs. This will enable you to have more mechanical advance and adjustment of when it advances. The curve kit is Moroso part number 72300.
Here is one link to a kit.

http://moroso.carshopinc.com/product_info.php/products_id/38206/72300
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clay
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Joined: 24 Nov 2002
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Location: South Carolina
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1972 Chevrolet Nova

PostPosted: Thu Sep 21, 2006 6:46 pm    Post subject: Reply with quote

This is based on a GM points style distributor and I'm assuming a HEI is similiar. There is a pin located in a slot directly under the rotor that limits the total amount of mechanical advance the distributor has. MSD units have bushing that change the size of the pin and control the amount of movement it has in the slot which controls how much the weights can actually move the trigger wheel in realation to the input shaft. In a factory unit you will have to weld up the slot or elongate it with a file. The distributor has to ba dissambled to do this which sort of sucks - there are others on this board that can do this with the mere pluck of a keyboard - you know who you are Smile - it isn't me for sure Sad . Now to change the rate of advance you'll have to do weights and springs like has been mentioned already. Clay
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Aerosmith
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PostPosted: Sat Sep 23, 2006 7:37 am    Post subject: Reply with quote

Take your cap off and make sure you can turn the advance plate. All you have to do is turn the rotor by hand, it should turn about 1/4" clockwise. If it doesn't turn you have a bad advance plate like I did, if it turns but not enough, you have a bad advance plate probably, if it turns fine then you need to check the vacuum advance canister. The weights and springs regulate the rate of centrifugal advance, the canister regulates the rate of vacuum advance at low rpm until the centrifugal gets up to speed.
After you set your initial at idle with the vacuum disconnected from the canister (factory on sbc should be 10 deg), attach the hose and check it, assuming you have a dial back light you should have about 33-35 something like that. That figure should stay about the same as you bring up the rpm's because as the centrifugal comes in the vacuum drops off. If you don't have a vac cannister or you have it locked out you won't get the centrifugal until something like 1800rpm.
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