Mystery CAM - what can you tell me about this lift and duration Options

[Aaron Cox]

friend here is buying another friends motor...

we went over and measure lift and duration with a dial indicator and a degree wheel...

cam had overlap (visible - did not measure) which makes me positive its a carb cam...

anyway... the specs (lift is +/- 3 tho)
___________ EXHAUST___INTAKE
LIFT (valve) .410" ___ .422"
Duration 165 deg 175 deg

duration... we measured when it opened, and measured when it closed.... we got big numbers so we divided by 2 to get what we have above... not sure those are correct... but those numbers also coincide to half lift....


so raby/brett/clayton others... what can you tell me about this cam? does it fit a WEB/engle profile?

motor was rebuilt many years ago... its a 1911.. and the cam definitely had visible overlap (both valves open for a few degrees, one closing, one opening)

[Brett W]

Something is not right with your numbers. When you checked the duration with a degree wheel, how did you do it?

You need to make a timing pointer that is attached to the block. You also need a piston stop or you need a dial indicator that will reach down in the sparkplug hole and tell you when you have exactly reached TDC, so you can set your pointer right. ONce you do that measure from .050 lift. When the valve reaches .050 lift tell me the reading on the degree wheel. Continue to rotate the engine over to where the valve stops .050 from the seat. Then read this number.

Based on that info I can give you a better idea of what you have. Might be a Web 91 or 86 series, although it might be a Elgin, Isky, Fat, LogiCam, etc. If Had some more numbers I could look through my records.