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What is the difference betwene these baselines of mesure for cams timing specs ? :

1mm lift
0.050 inches lift
and Seat-to-Seat

And what is the stock honda b18c cam spec at 0.05 and Seat-to-Seat ?

I have read MD article about a bunch of cam profile at 1mm but cant employ them cause my program only understand 0.050 and Seat-to-Seat.

Kosak
 

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depends on the ramp angle. if you have a cam doctor then you can read the duration at any lift for comparison. Just make sure you use the same valvelift point for both cam brands that you are comparing.

the point is, if you state on your website , like Crower, that you have say 250 degrees duration at 0.05 in. valve lift and Toda reports their cam as 260 duration advertised (i.e. NOT AT 0.05 in.) then you have NO CLUE whether the Toda has more or less duration than the Crower. If they reported their durations by the standard then the numbers are comparable and you can say one is more or less than the other.

In imports, the standard is 1mm (1 in. = 25.4 mm, you can do the math I'm sure) not 0.05 in. like the domestics which is an SAE standard.
 
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