10 replies to this topic

[oltonlad]

i'm going to rebuild my 1098cc engine soon as it is using a bit of oil, what cam would you guys recommend? i need the car to be sensible on the road and still have some bottom end punch, the head will be a ported 202....i think that something like a 276 would not be suitable, what do you guys think?

[Cooperman]

MG Metro or Kent 266 will be ideal. In fact they are very similar.

[twrminisport]

SW5 or above

You probably know already but you dotn want anything too revy in a 1098

Jesus

[Cooperman]

SW5 or above

You probably know already but you dotn want anything too revy in a 1098

Jesus

Do you, perchance, have the duration and lift of the SW5 compared to the 266?

[JustSteve]

the SW5 is 244 degrees with 7.14 lift

Edited by JustSteve, 26 October 2011 - 10:33 PM.

[mk1leg]

Try and get a 731 regrind its a thing of beauty.................good low down revs and all the way to 6500rpm.........I used 1 in my old 1071cc went like s**t of a shovel.................

[twrminisport]

SW5 or above

You probably know already but you dotn want anything too revy in a 1098

Jesus

Do you, perchance, have the duration and lift of the SW5 compared to the 266?

Of course

Inlet Lift Exhaust lift Duration power Band Overlap
SW5 7.14 7.14 244/244 1000-6000 28
266 6.68 6.85 260/270 1500-6500 36

I can do you the nominal valve lift in stages aswell if you want?

Oh and the 731 has a lift of 6.4 In / 6.4 Ex but an duration of 268 which may make it a little too 'cammy'

Jesus

Edited by twrminisport, 27 October 2011 - 08:49 PM.

[Cooperman]

Thanks for that. I can see why it would be a great cam in the low-revving 1098. In fact it would probably be not to far removed from the lovely old 510 which was always a nice mild cam for a 998 or a 1098.
I've always liked the Kent range as they seem to have a cam for every application and the 266 is a particularly good cam for a 1275.
I built a 1098 for a Sprite with a 276 and twin HS4's, etc, and it gave 75 bhp at 5800 rpm. Not bad low down either, but it had a very low final drive ratio.

[twrminisport]

Agreed. The only thing i would say is wrong with Kent is the lack of cam for a heavy going 998, the 276 is a very old cam profile and is outstripped by the Morspeed Phase 3 for instance and the 286 is too heavy going for any 998 really

Thoughs?

Jesus

[liirge]

MG Metro or Kent 266 will be ideal. In fact they are very similar.

Yup that would be my choice!

[Cooperman]

My son had a 998 Cooper for historic rallying and he fitted a 286 cam with the flowed 295 and other 'nice bits' It gave 74 bhp at 6500, but of course it had the SC Cr gearbox with a 4.1 final drive.
It was still not fast enough so we changed the engine for a 'full-on' 970 'S' engine giving 85 bhp ay 6700 rpm. Then it was a class winner. Personally I never liked it in either engine config. Not like my 1293.