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I installed the vacuum advance limiter that Lars supplied (which, by the way is an excellent piece), and measured the advance with my Bubba style Sun Distributor machine. Vacuum advance is 5.5* and centrifugal is 8.6*. That will give me 28+* at the crank.
From: At my Bar drinking and wrenching in Lafayette Colorado
That's an incredible piece of Bubba-Engineering! I'm impressed!! The numbers look like they're dead-on, and the 5.5-degree (11 crankshaft degrees) of vacuum advance is perfect - it's the exact design limitation of the Vacuum Advance Corrector, so your measured numbers look accurate and good. Good job with the checking and setup!
I am confused but that is not unusual . Are you saying that you will be setting the initial static timing (vacuum canister disconnected) at 19*? I strive for 8 to 10* and that seems to work well. I must be missing something obvious.
I am confused but that is not unusual . Are you saying that you will be setting the initial static timing (vacuum canister disconnected) at 19*? I strive for 8 to 10* and that seems to work well. I must be missing something obvious.
Paul74, you are not confused, he is setting it for 19 which I also thought was on the high side unless he is running a camshaft that likes lots of timing advance.
From: At my Bar drinking and wrenching in Lafayette Colorado
Long-duration cams need initial timing in the 18-degree + range. I run a very short advance curve with 20 degrees initial timing and 34 total on my 500-horse small block in order to get good idle and manifold vacuum. The problem with running these aggressive optimum timing numbers is that the vacuum advance will then end up adding too much timing, if a stock 18-degree vacuum advance is used. The Vacuum Advance Corrector allows you to keep aggressive total/initial timing by limiting the vacuum advance to only 10-12 degrees.
I installed the vacuum advance limiter that Lars supplied (which, by the way is an excellent piece), and measured the advance with my Bubba style Sun Distributor machine. Vacuum advance is 5.5* and centrifugal is 8.6*. That will give me 28+* at the crank.
I understand this is an older thread.....how / where can I get one of these LARS vacuum advance limiters...thanks
Lars, meet Bubba
. Are you saying that you will be setting the initial static timing (vacuum canister disconnected) at 19*? I strive for 8 to 10* and that seems to work well. I must be missing something obvious.
