Hi All

[Dion]

649 is a race cam so to get the most out of it will require a high cr, high cr won't work with a road car as you will need to run racing fuel or avgas. I would think a cam like a 286 with a 10cr will be a good performer.

[Boyscout]

A correctly dialed in 649 will be a bit lazier than a std 1275 below 3000RPM and then pull very strong up to 7500. I drove a 1380 Mini panelvan with 40 Sidedraft Weber, Mod head and 649, with a button clutch in traffic for a long time. It took some getting used to the clutch but it was totally drive-able in traffic.

[u09521]

I'm no camshaft expert, but what I've heard long duration cams like the 649 (300 degree) cams are not well suited to altitude and perform better at the coast. Maybe you should chat to a few mini experts or mini racers in Jhb to advise you on cam shafts. I know of some very quick race minis in Jhb that use cams with less duration than the 649. Btw what compression ratio you running? I would think a 649 would require a very high compression to get the most out of it.

Hi Dion, I've seen a Mini over the weekend with a 649 in Jo'Burg and it went very well. My compression ratio will be 10:1:1

Thanks
BTW my calculated CR is  10.27 - 10.43 depending on the figures used for dish volume and gasket thickness.  The pistons that came with the motor are 21251 Hepolite so I didn't want to push it any more.

[Boyscout]

That compression ratio is still low. The effective compression ratio with a high overlap cam like the 649 will be much lower than the calculated cr. According to Vizard you need about 13:1 to make a race cam work. You won't havd any detonation issues with 10:1 and a 649.