Measuring Cam Lobe Lift

tonyduc

New member
Hello All

I'm rebuilding my engine and the shop manual for my 170 inline describes measuring cam lobe with the engine in (measuring the lift of the pushrods). Can this be done just as accurately with the cam out? Essentially measuring the base circle of the cam and subtract it from the thickness across the cam lobe’s highest point, per http://www.lunatipower.com/Tech/Cams/CamSpecTerms.aspx ?

Thanks
Tony
 
tonyduc":39gedjwd said:
Hello All

I'm rebuilding my engine and the shop manual for my 170 inline describes measuring cam lobe with the engine in (measuring the lift of the pushrods). Can this be done just as accurately with the cam out? Essentially measuring the base circle of the cam and subtract it from the thickness across the cam lobe’s highest point, per http://www.lunatipower.com/Tech/Cams/CamSpecTerms.aspx ?

Thanks
Tony

You can measure it that way

It won’t indicate everything that you could if the cam were on centers, but it’s not bad. Just be sure your measurements are repeatable. There is taper ground into the lobe, so measure all in the same spot on the lobes.

Visual inspection is just as important. The surface finish of the lobe and the lifter. If re-using lifters, they have to go back onto the same lobe.
 
Tony, check your camshaft card. If the lobe lift is .300" x 1.5=.450"
If you have 1.65 rockers = .495 lift.
 
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