10 inches at 850rpm idle, it does go up with no load rpm
The advance I have is adjustable, 46* verified with a dial back timing light, is the most I can get out of the advance adjustment.
Canisters come in varying degrees of advance capabilties and different starting/ending points of vacuum inches.
You can change when the advance starts by adjusting it with an allen wrench. It will not change when full advance is reached or total advance. So if you crank it out counterclockwise it wont start advancing till 15” ( random #) but it will be all in by 18”... so it just shortens the window ...
The arm is usually marked for the total degrees of capabilities ... 8.5 means 17* of advance when reading the dampner.
I have heard of cans that are not adjustable but I think it is due to a smaller allen screw being used in some.
There are also different advance plates and they are marked in 1/2 crank degrees as well... I dont know why some slots are angled though ? It might allow more advance without having a super long slot or it might be a leverage feature ?
