Hey Ralf, The distributor is still in the car. Hard to measure the gap with all the stuff around it. I will let you know when I take it out. LG Olli
Yeah the stock plastic bushings disappear after 20 or 30 years then you have 4 deg more advance with same initial timing....not a good thing....the demise of many BBBs
Hey Larry, I installed the crane Kit today following your instructions. I have just not been able to get the bushing, so I just made one out of a piece of hard rubber. Lets see it that works in combination with the crane springs..
Here are my measurements: http://www.v8buick.com/index.php?th...amethrower-hei-iii.353936/page-2#post-3066920 Have you had time to set your timing and measure the mechanical advance with your new setup?
Ok, finally I had the time to measure the mount of advance and set the timing accordingly. Car was warmed up after some autobahn driving. I checked three times and here are the numbers: - Initial timing 14* @ 770 RPM Idle in P w/o VA - Total timing @ 2500 RPM : 28* w/o VA (Using my selfmade rubber bushing and crane's yellow/yellow springs) - Idle with VA connected to intake vacuum (14inHg): 34* @ 970 RPM, 20 PSI oil press. - @ 2800RPM 41* with everything connected. - Idle in D everything connected: 25* @ 680 RPM and 10 PSI of oil pressure. I know, I should have a bit more mech. Adv. Will fix that as son as I get the right bushings. Any thoughts?
That's about right. If you move your initial to 20*, you'll have 32*. The only problem might be cranking it hot. You might want to restrict your vacuum advance to 10* if you get any part throttle ping or surge. Looks good.
Great! Thank you guys. One last thing: how do I know if the adjustable spring for the VA has the right tension? Now its set right in the middle.. Only by detecting the Ping?
Yes, part throttle ping or surge. If it surges at steady state cruise speed, there is too much advance from the canister. If it pings when you transition from steady state cruise to moderate acceleration, the advance from the canister isn't going away fast enough when you get on it. The spring tension affects the rate of vacuum advance, what vacuum it starts at, and what vacuum it is all in at. Also, how fast it decreases with decreasing vacuum. Vacuum must overcome spring tension for the canister to add advance.
