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| Joined: | 05-01-2005 |
| Location: | Minneapolis, Minnesota USA |
| Posts: | 573 |
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I'm not so sure about the cam being a Lotus 104. A 'Lotus' 104 cam had 44444444... stamped all around the exposed bit of shank between the front of the cam carrier and the back of the pulley.
Many cam grinders produced '104' cams that did not match the Lotus 104 specs, and "104" as a name was used about like "3/4 Race" was used for American V8 cams.
L-o-n-g ago, I bought a pair of "104" cams on eBay, and they are NOT Lotus 104 cams. They have a much hotter profile, and they're just sitting on a shelf because I don't know what they are or how to time them.
Like yours, they were stamped with "104" on the back end. So, I called Delta Motorsports, described the markings, and they said it wasn't their 104 cam. So I called Delta Cams, and they said it wasn't theirs. I never did find out whose '104' cams they were, but the lobe profile does not match the genuine Lotus 104 cams I already had on hand.
Lotus 104 Cam Specs:
0.415" Lift (0.410/ 0.415"/ 0.420", depending upon who you ask).
32° .Int Opens, BTDC
60° .Int Closes ABDC
60° .Exh Opens, BBDC
32° .Exh Closes ATDC
64° .Overlap, Degrees
272° Duration, Degrees
104° MOP, Degrees
On Delta Motorsports website, they list their "104" cam as Part No BLL-104, 280° Duration, 0.420" lift.
Good luck,
Tim Engel