Okay, the purpose of this thread is to explore what Dan started and compare the different cams for the 4 cylinder Wings.
I've ordered two sets of cams off e-bay and, of course, the original set already in my 81' 1100.
Early wings had not only the mechanical pump, but points ignition. The back ends of both cams have these drives sticking out of the rear of each head. The late cams have neither because of electronic ignition (also on the 1100s) and electric fuel pumps. All cams will physically bolt into all 4 cylinder Wings (if you do some chopping).
The height and thickness of the lobes was the first thing that jumped out at me (besides the 1200 cams being worn). So, I proceeded to rig up a way to measure both sets. My husband is not going to be pleased that I used his table saw, but I needed a metal table to secure my dial indicator base. I'll make sure I don't get his clamps dirty..
The first pic shows a simple set of vee-blocks cut from scrap 2x4, and the dial indicator set on the lobe surface. The second pic is the addition of a degree wheel, which is a protractor taped to a carboard backing so I can see the markings better. The bent wire is my indicator.
So far, I have this:
EARLY WING CAM:
Duration: 170 degrees
Lobe Centers: 112 degrees
IN Lift: .273"
EX Lift: .261"
One side of the lobes have a very steep ramp, with a skinny base circle.
LATE WING CAM (1200):
Duration: 145 degrees
Lobe Centers: 115 degrees
IN Lift: .225"
EX Lift: .227"
Both sides of the lobes are equal, with a fat base circle.
More to come.
I've ordered two sets of cams off e-bay and, of course, the original set already in my 81' 1100.
Early wings had not only the mechanical pump, but points ignition. The back ends of both cams have these drives sticking out of the rear of each head. The late cams have neither because of electronic ignition (also on the 1100s) and electric fuel pumps. All cams will physically bolt into all 4 cylinder Wings (if you do some chopping).
The height and thickness of the lobes was the first thing that jumped out at me (besides the 1200 cams being worn). So, I proceeded to rig up a way to measure both sets. My husband is not going to be pleased that I used his table saw, but I needed a metal table to secure my dial indicator base. I'll make sure I don't get his clamps dirty..
The first pic shows a simple set of vee-blocks cut from scrap 2x4, and the dial indicator set on the lobe surface. The second pic is the addition of a degree wheel, which is a protractor taped to a carboard backing so I can see the markings better. The bent wire is my indicator.
So far, I have this:
EARLY WING CAM:
Duration: 170 degrees
Lobe Centers: 112 degrees
IN Lift: .273"
EX Lift: .261"
One side of the lobes have a very steep ramp, with a skinny base circle.
LATE WING CAM (1200):
Duration: 145 degrees
Lobe Centers: 115 degrees
IN Lift: .225"
EX Lift: .227"
Both sides of the lobes are equal, with a fat base circle.
More to come.