36 replies to this topic

[Sam Walters]

Its not all about numbers.

Its about how its developed as much as it is putting it to the floor!

[jaydee]

Was trying to post a detail table..its quite impossible on a forum :S

Edited by jaydee, 18 December 2009 - 11:29 PM.

[D1k1m4y]

12g295 head
alloy inlet manifold
hif38
exhaust system with lcb
pipercross air filter

I would recommend the kent 266. Thats what i have in my 998 and im really happy with it. Heres my engine spec for comparison (its pretty similar):

998 block, standard size bores & pistons (flat top)
12g295 head, skimmed to suit & mildly ported
hof38 on a ported mg metro inlet manifold
lcb & rc40
kent 266 & minispares steel vernier timing gear
k&n stub stack in a k&n cone filter

With the 266 the idle is hardly any lumpier than the standard cam, and it pulls from really low down too. Theres a little bit more power at the bottom end and considerably more through the midrange and top end, once the revs are up past 3000 it really goes. I personally wouldnt want anything any wilder as it still has plenty to give at 6000rpm, and its my daily car so i dont want it to be a pain in traffic etc. Im currently running the standard 3.1 final drive but this is next on the list for changing, as now it seems a little tall for such a revvy little motor. Hope this helps.

you had that on a rolling road whats the bhp like?

[Austin]

Ive not had it rolling roaded yet cause im still playing with it, but once ive swapped the final drive and flywheel im gonna take it in. I just tried a few different needles to get the mixture right and its pretty close. I dont have any idea on bhp output though sorry.

[Lumbergh]

I think that there is too much talk about what cams can do in terms of power. For city driving power is not the issue whereas torque is. I put a 276 into my 1275 S and it was a nightmare for city driving. It wouldn't tick over and it took off at 2500RPM which is dangerous in a city situation. So basically it was uncontrollable. I put a 266 into my 998 bog standard Cooper and it is a dream. It has great low rev pull and goes to the top 6000rpm without difficulty. I beat Alfas and BMWs from the lights regularly. I've since offloaded the 1275 Cooper S and I'm now building a 1071 engine and I'll be putting a 266 into that. So don't get hung up on specs. Driveability is more important. That's my tuppence worth. I hope it helps.

[myredmini]

I think that there is too much talk about what cams can do in terms of power. For city driving power is not the issue whereas torque is. I put a 276 into my 1275 S and it was a nightmare for city driving. It wouldn't tick over and it took off at 2500RPM which is dangerous in a city situation. So basically it was uncontrollable. I put a 266 into my 998 bog standard Cooper and it is a dream. It has great low rev pull and goes to the top 6000rpm without difficulty. I beat Alfas and BMWs from the lights regularly. I've since offloaded the 1275 Cooper S and I'm now building a 1071 engine and I'll be putting a 266 into that. So don't get hung up on specs. Driveability is more important. That's my tuppence worth. I hope it helps.

 

I imagine they sorted it, the initial thread was posted 12 years ago!

[Cooperman]

The original 997 Cooper cam is nice in a 998. I have fitted a 510 cam from a standard 1275 S to work well in a 998.
As stated, what is needed is good mid-range torque.
In respect of modern cams, the Evo001 seems to be great in both small- and large-bore engines.