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 Posted: 06-21-2019 05:15 pm
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Esprit2

 

Joined: 05-01-2005
Location: Minneapolis, Minnesota USA
Posts: 512
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Greg Fletcher wrote:
I believe a 104 cam originally from Lotus would be marked on the nose with a "444".Correct.

Lotus Markings are on the exposed bit of cam that's visible between the pulley and the cam carrier:

In Lotus' early part numbering system, all cams had the same part number, but with a letter prefix to identify each cam. The C, D & E cams were from that era. The A & B cams were 'developmental' cams from before the 907 went into production, and were never sold.

At some time between the E-Cam and 104-Cam, Lotus changed their part numbering format. Each cam got it's own part number, and the cam's ID referred to the last three digits of it's part number. The early C, D & E cams were also issued new part numbers, but the old 'alpha' names stuck as 'street' names.

Lotus Cam Names and Part Numbers. . . . . . . . . . . . . ID Mark on the Cam's exposed shank.
C-Cam = C907E0351Z = 101-Cam = F907E0101G . . . None... a smooth shank.
D-Cam = D907E0351Z = 102-Cam = G907E0102G. . . One groove cut all around the shank
E-Cam = E907E0351Z = 103-Cam = J907E0103G. . . . Two grooves
. . . . . . . . . . . . . . . . . . 104-Cam = A912E0104F. . . . 44444444... stamped all the way around the shank.
Competition Only. . . . . . 105-Cam = A908E0105 . . . . 105 stamped in one place on the shank, not 'all around'.
Competition Only. . . . . . 106-Cam = A908E0106 . . . . 106 in one place
. . . . . . . . . . . . . . . . . . 107-Cam = A912E0107F . . . 77777777... all around.
Competition Only. . . . . . 108-Cam = A908E0106 . . . . 108 in one place

Regards,
Tim Engel

Last edited on 06-21-2019 05:22 pm by Esprit2