Paging LARS
Thread Starter
Le Mans Master
Joined: Jan 2001
Posts: 6,938
Likes: 1
From: San Diego CA
Paging LARS
Hey LARS I got my timing just about perfect however I need a set of springs and your the guy to ask.
Without springs the distributer is fully functional giving 36 degrees advance.
Idle set at 750RPM
With silver points dist. springs I get 14 degrees initial and MAX OUT at 33 degrees at 2600RPM.
With the lightest HEI gold springs I get 21 degrees initial and MAX OUT 36 degrees at 2300RPM.
I need some springs in between. I do not want more than 15 degrees initial and which to achieve 36 degrees by 2900 RPM. Is there such a spring and do you carry them?
Without springs the distributer is fully functional giving 36 degrees advance.
Idle set at 750RPM
With silver points dist. springs I get 14 degrees initial and MAX OUT at 33 degrees at 2600RPM.
With the lightest HEI gold springs I get 21 degrees initial and MAX OUT 36 degrees at 2300RPM.
I need some springs in between. I do not want more than 15 degrees initial and which to achieve 36 degrees by 2900 RPM. Is there such a spring and do you carry them?
Tech Contributor
Joined: Aug 1999
Posts: 14,379
Likes: 6,390
From: At my Bar drinking and wrenching in Lafayette Colorado
Re: Paging LARS (Cali,68,L-79)
Cali -
The two springs don't have to be the same - the spring force is cumulative, so you can mix and match springs to achieve the curve you want. I use one black and one silver out of the Mr. Gasket MG 927 or 928 kits on my point-style distributor setups.
The two springs don't have to be the same - the spring force is cumulative, so you can mix and match springs to achieve the curve you want. I use one black and one silver out of the Mr. Gasket MG 927 or 928 kits on my point-style distributor setups.
Thread Starter
Le Mans Master
Joined: Jan 2001
Posts: 6,938
Likes: 1
From: San Diego CA
Re: Paging LARS (Cali,68,L-79)
Safety Car
Joined: Feb 1999
Posts: 3,631
Likes: 14
From: Fountain Hills AZ
Re: Paging LARS (Cali,68,L-79)
If you are getting a different initial advance with different springs and haven't changed the distributor position you need to measure initial at a lower rpm. Lighter springs will cause centrifugal advance to start sooner, sometimes below normal idle speed. Unless the springs are incorrect for the distributor, you shouldn't see any difference in total advance between light or heavier springs, only how soon it arrives. With ANY springs, rev the engine until you're sure that it is no longer advancing and set timing at 36º (or whatever total you want). Unless it results in hard starting (starter kickback or slow cranking), you won't have too much initial.
Thread Starter
Le Mans Master
Joined: Jan 2001
Posts: 6,938
Likes: 1
From: San Diego CA
Re: Paging LARS (Vetterodder)
Vettrodder we set timing at 36A with no springs then reinstalled springs and verified we are still able to achieve 36 degrees, you see the result above. Now your saying time it with the springs installed
Drifting
Joined: Dec 2002
Posts: 1,887
Likes: 1
From: Hill AFB area Utah
Re: Paging LARS (Cali,68,L-79)
I think what he is trying to say is that if you have not moved the distrib just changed the springs and your inital timing is changing the springs are letting the advance start to come in at idle speed. Good luck Dewayne
Safety Car
Joined: Feb 1999
Posts: 3,631
Likes: 14
From: Fountain Hills AZ
Re: Paging LARS (Cali,68,L-79)
Vettrodder we set timing at 36A with no springs then reinstalled springs and verified we are still able to achieve 36 degrees, you see the result above. Now your saying time it with the springs installed
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Thread Starter
Le Mans Master
Joined: Jan 2001
Posts: 6,938
Likes: 1
From: San Diego CA
Re: Paging LARS (Vetterodder)
Just ordered MG-928 springs. When it arrives am using silver/ black per LARS to achieve 36A by 2500RPM. See this way I can achieve 36A exactly when I want without having to use so much initial timing as those stock silver springs require.
I expect the following 12A @ 750RPM and 36A @ 2300-2500RPM.
I expect the following 12A @ 750RPM and 36A @ 2300-2500RPM.
Le Mans Master
Joined: Nov 1999
Posts: 5,768
Likes: 3
From: San Diego CA
Re: Paging LARS (dmrodco)
I think what he is trying to say is that if you have not moved the distrib just changed the springs and your inital timing is changing the springs are letting the advance start to come in at idle speed. Good luck Dewayne
We mixed the springs as Lars suggested, but the selection that Cali has was HEI springs and I suggested that he contact Lars for a better choice of springs, which he has done.
I drove Cali2 after this and it has plenty of power and doesnt surge or ping at any loading or speed that we could find.