36 replies to this topic

[jaydee]

I've always had good results with the old 997 Cooper cam profile, in small bore Mini engines. It was originally known as the 948 (nothing to do with 948cc A series engines) & is still available from MiniSport: CA2P-pin drive, CA2M-slot drive (A+). I don't know how this compares with the Kent cams mentioned, but it gives a very good torque & power band, & the improvement is noticeable without having to go to extremes with ports & inlet valves.

Its somewhere beetween the kent 256 and the Mg metro cam, i have the complete figures somewhere of these cams, will post them later.

[liirge]

You're best bet would probley to either get a mg metro cam/276/sw5 with that spec.

im currently using a sw10 in my 998cc with a 3.6FD lightend and balenced bottom end etc... excellent cam if you dont mind a lumpy idle and not much below 3000rpm.

Just out of interest how lumpy is your idle? and how bad is it below 3000 rpm?

[minimender]

If the idle is lumpy with a hot cam then try this experiment.
Mark the dizzy and block with tipex so as you know where the timing should be.
Then advance the dizzy about 5 to 10 degrees.
It should tick over like a honda or as near as, and the lumpyness will have gone.
Make a note of how much you advanced it and then put it back how it was.

You now know that you need a dizzy with less total advance so as you can have about (aprox) depending on the cam, 15 degrees advance around idle instead of about 10, which means having a dizzy with less advance built in so as it isn't over advanced top end.
You can have the best of both worlds but you need to match the dizzy to the engine and not buy an approximate off the shelf specially built racing one.

[blacktulip]

what about the piper 270?

[Jonny998cc]

morspeed phase 2. awesome cam

[l_jonez]

morspeed phase 2. awesome cam

yes i was originaly after one but there was a long wait so went for a sw5. also now morspeed are no longer tradeing

[Shifty]

I've got an sw5 in my 1015 lump and I hate it!!

I'm looking forward to ripping it out and sticking in a 276, that should give a bit more of a kick than the sw5!!

[cap'n crunch]

Hope this helps


Camshaft--------Duration In/Ex-----Lift In/Ex (mm)-----Overlap

997 Cooper---------252/252 ----------6.35/6.35------------37
SW5-----------------244/244----------7.14/7.14-------------28
MD246--------------252/252-----------7.23/7.23 ------------36
MD256--------------254/254-----------6.66/6.66-------------42
MD266--------------260/270-----------6.68/6.85-------------53
MD276--------------270/280-----------7.44/8.00-------------63
MG Metro-----------252/268-----------6.35/6.35-------------45

Edited by cap'n crunch, 18 December 2009 - 07:49 PM.

[Jonny998cc]

morspeed are no longer trading? i went the other week:S

[Racer_Pete]

You're best bet would probley to either get a mg metro cam/276/sw5 with that spec.

im currently using a sw10 in my 998cc with a 3.6FD lightend and balenced bottom end etc... excellent cam if you dont mind a lumpy idle and not much below 3000rpm.

Just out of interest how lumpy is your idle? and how bad is it below 3000 rpm?

It's not to bad idles at about 1400revs. When you try and set off quickly (traffic light blast) there isnt much torque and you have to wait for a second for the cam to come in, even with the lightend fly, crank, backplate etc.. but once you get going its great espically with the SC/CR box. real strong surge of power. ive just done over 100miles in 4days and havent had a problem around town with it + im using a organic plate, just needs a little bit more revs to get moving from a stand still.

[minimender]

It's not to bad idles at about 1400revs. When you try and set off quickly (traffic light blast) there isnt much torque and you have to wait for a second for the cam to come in, even with the lightend fly, crank, backplate etc.. but once you get going its great espically with the SC/CR box. real strong surge of power. ive just done over 100miles in 4days and havent had a problem around town with it + im using a organic plate, just needs a little bit more revs to get moving from a stand still.

Think you'll find that it will come on cam quicker if you adjust the timing. The surge of power is probably the dizzy advancing up and giving it the correct timing, if you could get it advancing up quicker then it will get away better.

[Racer_Pete]

It's not to bad idles at about 1400revs. When you try and set off quickly (traffic light blast) there isnt much torque and you have to wait for a second for the cam to come in, even with the lightend fly, crank, backplate etc.. but once you get going its great espically with the SC/CR box. real strong surge of power. ive just done over 100miles in 4days and havent had a problem around town with it + im using a organic plate, just needs a little bit more revs to get moving from a stand still.

Think you'll find that it will come on cam quicker if you adjust the timing. The surge of power is probably the dizzy advancing up and giving it the correct timing, if you could get it advancing up quicker then it will get away better.

Ive already advanced it on the road by turning the dizzy slightly clockwise, was better than it was before, but I cant really expect too much bottom end pull from a cam thats designed for bigger bore motors and using it in a 998.

[Austin]

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.

[minimender]

It's not to bad idles at about 1400revs. When you try and set off quickly (traffic light blast) there isnt much torque and you have to wait for a second for the cam to come in, even with the lightend fly, crank, backplate etc.. but once you get going its great espically with the SC/CR box. real strong surge of power. ive just done over 100miles in 4days and havent had a problem around town with it + im using a organic plate, just needs a little bit more revs to get moving from a stand still.

Think you'll find that it will come on cam quicker if you adjust the timing. The surge of power is probably the dizzy advancing up and giving it the correct timing, if you could get it advancing up quicker then it will get away better.

Ive already advanced it on the road by turning the dizzy slightly clockwise, was better than it was before, but I cant really expect too much bottom end pull from a cam thats designed for bigger bore motors and using it in a 998.

Yes you can, you've proved it by twiddling a bit. Imagine how good it would be if time were spent on modifying the dizzy to make it go.
You cant advance it too much with that dizzy as it will then be over advanced at the top end, so you need to restrict the top end advance then you can have the propper advance lower down. simples

[Reece Jackson]

i run a kent md310 in my 998 most will say its to lairy for a tuned 998 but we will see when i post my power graph up