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04-25-2015 #1
anyone run locked out timing on a BBC or SBC
After reading various sources on timing, I'm wondering what if any input you guys might have on eliminating the distributor mechanical advance. Thus running the timing completely locked at let's say 37* degrees. Love to hear any pros & cons on running this setup on a road course and or autocross. Thanks in advance for any input.
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04-25-2015 #2Registered User
- Join Date
- Jun 2006
- Posts
- 167
For racing only this is fine. Ideally, when running mechanical advance you want it "all in" by about 3000 rpm. In a racing situation you do not spend much time below 3000 rpm, so not much difference. From the other side of the coin, if you are running 37 total including mechanical, then what would you gain? Since you spend most of the time above 3000, you are running full advance most of the time anyway. Car would be easier to start if it is not locked out.
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04-25-2015 #3
Thanks 68cuda440 for the response, I'm running a digital 6plus Msd box which allows me a setting for 20* degree start retard. this will hold the advance until 800 rpm and kick in again under 500 if neccasry. I think this puts a ease on starting and kick back from compression. I recently had a spring in the mechanical advance fail over the weekend. Now I'm interested in eliminating the advance.
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04-25-2015 #4Registered User
- Join Date
- Jun 2006
- Posts
- 167
That should work fine. The cat's meow is the MSD 6530, with that box you run your distributor locked out and program the curve with your laptop. There is even a way to get it to do vacuum advance. Follow along on this thread if you are interested in how that works: http://www.lateral-g.net/forums/showthread.php4?t=48612
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04-25-2015 #5