This is an old thread... did you ever get it sorted out? Sorry I'm late to the game, but I don't hang out on LotusTalk very much.
2 Grooves does indicate the Euro E-Cam (aka, 103 cam). It's 260° duration, 55° overlap, 0.344" lift, and 102.5° MOP (Maximum Opening Point, aka Lobe Centers). The timing dots on the correct pulleys are Yellow.
On the dual-MOP pulleys you have, the red dot is 110° MOP, and the blue dot is 'called' 100° MOP, but it's really 97°. The geometry doesn't support both 110° and 100° co-existing on the same pulley, so they cheated a bit to force-fit the 100° blue dot onto the same pulley.
Compared to where the E-cam wants to be, the red dot pulley would retard the intake 7.5°, and advance the exhaust 7.5°. The 97° blue dot would advance the intake 5.5°, and retard the exhaust 5.5°.
The stock cams were 272° duration. They liked to rev and made more top end horsepower when driven in a spirited manner; but many people who bought a 4-seat estate were looking for something a little more civilized, with more low end torque, and easier to drive in traffic. The E-cam was Lotus first, half-step in that direction. The later 107 cam took a bigger step in that direction, and is popular with many Jensen-Healey owners (same engine, but more of a silk scarf/ wicker basket crowd).
So what do you want? A gentleman's estate, or a 4-seat sports car? If you want the milder engine, we can work on sorting out these cams. If you want the top end performance, the E-cams won't give it to you, and you should talk with the shop about replacing the original cams (do you have them, or did they keep them?).
Set the crank to TDC (Top Dead Center). If the cam pulley timing marks end up on the far opposite sides of the cam pulleys, then rotate the crank clockwise (as viewed from the front) one full revolution, and back to TDC. The cam pulley timing marks should now align on the imaginary centerline between the two cams. Snap a clear, well exposed picture of the front side of the cam pulleys, and post it here so I can see the timing marks.
Of the two timing marks facing forward on each pulley, one will be next to an IN mark cast into the pulley spokes, and the other will be next to an EX mark. On the intake pulley, the dot next to the IN mark should align with the dot next to the EX mark on the exhaust cam pulley. And they must align on the imaginary centerline between the cams. If they align, but are high or low, then the cams are NOT correctly timed.
If the dots are aligned on the centerline, then the pulleys are correctly timed. BUT they're the WRONG pulleys (not yellow dot, 102.5° MOP pulleys). You can 'correctly' time the WRONG pulleys all day long, and the cam timing will still be wrong. All this talk about checking the current timing is only to see if the mechanic had some clue what he was doing (he at least got the correct dots aligned). But he still gets failing marks for using the wrong pulleys. The cams are incorrectly timed.
Can you use adjustable pulleys?
Yes. But they don't come pre-set to any MOP, you have to do that. And setting them is a bit of a procedure involving a degree wheel on the crank, dial indicators on the piston crowns and cam lobes, and some idea about what you're doing. If you had to ask if adjustable pulleys can be used, then I'm betting you don't know how to set them up. Is that about right? I would recommend that you just order up a set of Lotus 102.5° MOP pulleys from a UK supplier, like SJ Sportscars, Burton Power, PNM Engineering... etc. You can try JAE and Dave Bean, but I'd be surprised if they had anything for you.
If you post and I don't respond to you right away, PM me. Again, I'm an infrequent participant on LotusTalk.
Last edited by Esprit2; 02-12-2018 at 12:25 PM.