[TRADERMIKE 2012]

Originally Posted by lust4speed

Reference post 473: In general, if you are all-in by 2,500 and you have pinging between 2,500 to 3,000 then normally you would need to slow the curve down and not have full advance in before 3,000 RPM. Now my comment has to be that if you truly only have 24° total advance then that is a decent number to be at in the 2,500 RPM range and the curve shouldn't have to be additionally limited.

Also did you have your vacuum advance hooked up for the test? An aggressive vacuum advance module can also cause mid-range detonation.

Wondering if the GIGO theory applies here and if your timing light (or balancer ring) is reporting true numbers.

I am running my Timing @ 6 degrees BTDC. One of the Posts should show that timing curve in the pictures That I have provided.

That being said, Tom has me Timing @ 12 Degrees BTDC. , my Engine could not take that high of an initial without rebuilding the Dist. with the kit that I have in stock. So, for test reasons we tried his test at
9 degrees BTDC. and we hit ping/det (slightly) at 2,000-3000 RPM, that is the curve you see today. We asked Tom whether or not we should try 8 * BTDC.
on next trial? We have not received an answer to that question yet.

I was told to perform this particular timing test with the Vacuum advance "disconnected". We plug off the Vacuum and use our Vacuum gauge at that hose junction to measure for Inches of Mercury (HG).

We first changed our Initial, that is at 6* BTDC. and upped it to 9* BTDC., for the test and then returned the Dist. Timing back to 6* BTDC. after we were done experimenting.