12 replies to this topic

[1990minicity]

Very fast road 998.
big valve cooper head etc big HIF44
should i go with a kent 286 or a Morspeed MSPD Phase 3 trackday cam? or even a kent 286 scatter?

Ta

[minimender]

Very fast road 998.
big valve cooper head etc big HIF44
should i go with a kent 286 or a Morspeed MSPD Phase 3 trackday cam? or even a kent 286 scatter?

Ta

I wouldn't go any more that a 276 for the road

Loose a bit at the top end but gain a lot mid range I've found

just my opinion

[PhilipGCaldwell]

if its just a trackday toy then 286, RacerPete built a 998 with a 286 and I think he loved it
I have a 276 in mine and its good, bit lumpy below 1500 revs but very driveable

[minimender]

if its just a trackday toy then 286, RacerPete built a 998 with a 286 and I think he loved it
I have a 276 in mine and its good, bit lumpy below 1500 revs but very driveable

Think you'll find the lumpyness is down to ignition timing being too retarded at low revs.

Plenty of advance down there and she'll tick over like a baby

[twrminisport]

Interesting. I would probably go for the Trackday cam as its a much more modern cam profile and produces the same inlet lift as the 286. However the exhaust lift is actually less than the 276. Seems to me its a tradeoff.

PhillipGCaldwell: You shouldnt have that issue when your megajolt is fitted with a decent map in place

Edited by twrminisport, 23 July 2011 - 09:25 PM.

[Shifty]

I'd have thought a 286/phase 3 would have been a bit heavy for a 998, over cammed for the sake of being over cammed.

Unless you're running a huge and I mean huge ££££ spec motor a cam that heavy would be a waste. As already said a 276 would be as much as I'd like to use on a 998.

[1990minicity]

It will be fairly heavy spec wise, Im going to fully lighten the rods crank etc and have straght cut drops etc.
What do you think?

[Cooperman]

Built a 998 with a 286, a 12G295 head at 10.8:1 CR, twin 1.21" SU's, etc.Power was good and peaked at 6500 rpm, but almost nothing useable below about 3500 rpm. Had to fit a low final drive to ensure the clutch would last at least for a short while. Good class-winner on Historic events, but not really any good on the road. Swapped that engine for a 970 Cooper 'S' lump with same cam, but twin 1.5" SU's and gained 10 bhp at 6600 rpm. Again nothing below about 3500 rpm and after fitting a SC CR box had to use a 4.1:1 final drive. It didn't 'arf rev though.

[Shifty]

What do you intend to use it for?

If its just gonna be a trackday weapon then give it a go, but for road use its gonna be a pig to use.

[1990minicity]

How low final drive?

[minimender]

As Shifty says

286 will rev but you will have to rev it to get any power. Bigger isnt always better, the motor will be very lumpy below 3000 and maybe higher.

It will use gallons of fuel as well,......... MG cam is good up to a higher state of tune than you would think

If you have big valves and a ported head with HIF 44 you can actually loose power over a well ported head with standard valves and an inch and a half carb.

Very tricky this tuning lark, dont make any sense sometimes.

[minimender]

How low final drive?

Give you an example.

I once ran an 1100 clubman which was standard and had a 3.6 diff

My mate had a tweaked 1275 with a 3.4 diff

My 1100 was quicker getting away and was faster on the motorway.

[minilee94]

hi mate i pm'd you but no reply just wonderd if you got pm