dogvet, according to crane they said do not ground the voes wire. They only want you to ground it when hooking up a timing light then remove it afterwords. This sound ok but tis funny that the dyna ignitions tell you the opposite
Yeah, the instructions were a bit vague about that so I tried it both ways.
If you look at the advance curves, you don't go to full advance till almost 5000 rpm.
I set my full advance on my 107 at 30 degrees since I'm running 10.5:1 compression heads and I only run premium gas (no pinging). Sucks that it costs as much now as it used to cost to fill up my car.
Had a chance to do a burnout at a friends house the other day and smoked 2 pounds of rubber off the ol back tire and no pinging at all. Plugs look good and none of that deceleration back fire out the pipes when I shut it down.
With these big motors, I'd be reluctant to run retarded timing at the higher rpm range. It's a judgement call I guess. S&S doesn't recommend using a VOES on the big engines because of the retarded timing...at least that's what I was told years ago. Retarded timing may be good to reduce pinging on bad gas, but at higher rpm, you've got unburned fuel going out the exhaust and that means you're loosing performance.
Even the Crane instructions state "If you have a passenger or are using low octane gasoline, minimum advance will reduce spark knock. Maximum advance will give higher performance but may require the use of high Octane gasoline".:zz2cents: