will a turbo work with this cam?
Turbo Mini Forums

I've had enough of buggering about with the weber, It needs the throttle spindle bearings replacing, and even with a good puller I can't remove them. I'm not spending any more money on it, thats it, bin time. I'm gonna turbo the engine as I have everyting I need already anyway.

The engine as it is n/a currently has quite a hot cam in, A piper 285 scatter cam. Now, I don't want to change this as it pulls hard from 3000 rpm and has a nice flat power curve all the way to 6500 rpm and I would like to retain the revvy nature of the engine with the turbo on.

I don't have the specs for the cam unfornunately and don't really want to buy another, I will regain some bottom end because the turbo has the smaller 0.25 or whatever it is exhaust housing.

So, is it likely to work, I could ditch the 1.5 roller rockers to slightly counter the effects of the cam should it be required.

I'm not to bothered about bottom end power as long as things start happeneing from about 3000 rpm

Only one way to find out really.......

If you're determined not to chhange it, why ask us for opinion?

It will of course 'work' but my guess is that it will be really annoying to drive.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

I personally think it won't be too nice, the reason the power comes on at 3k rpm in NA form is due to the overlap not working well until gas speeds reached at 3k rpm, if you add the extra backpressure from a turbo I think this will only exacerbate things. But as above, if you don't want to change it, give it a go, and depending on how good/bad it is will drive you to either put up with it, or swap it for something else.

I do actually have an mg metro cam and a 276 kicking around in the garage so do not mind changing it. I just like the 285 in there at the moment, but obviously I'm completely changing the nature of the engine from what the 285 is optimal in.

it will be a pig to drive and wont feel nice
mg cams the way to go

I used a Kent 286 many years ago.

As you know, a cam isnt an easy swap. I stuck it for about 3-4 days before I removed it.

It killed allpower off boost, didnt feel any faster on boost, and all it did was make it rev harder ( power from about 4500-5000 to 8000rpm )

Putting the MG Metro cam back in, was like working magic. Now I coulse use 4th gear at any rpm....whereas before, anything below 3000rpm, and you just slowed down.


it's entirely up to you to try, and if you have mapped ignition it might help ( I only had a welded dizzy and no such thing as widebands back then )

But I say dont waste your time with a turbo and that cam.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

well that sums it up rather nicely. I will have to take the transfer casing off anyway to change the oil pump for a turbo one anyway. so separating the block from box won't make a lot of difference to change the cam.

I do know this topic has been covered many times before but first hand experiance really puts things into perspective.

minimole,

have a look at the timing figures on the kent 266 dont over look this cam minispares north have some on a BILLET for a nats over £100 inc .....VAT
they are very accuratly ground

tom booth was WELL suprized when i built him a low spec turbo engine, using this cam, his arse fell out with the sheer torque and power it deliverd.

I have a mildly racey cam in mine and is a bit of an arse to set off with, you have to rev it to pick up with out it stalling, so id imagine the cam you have would be a proper bind!

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


Fibreglass Parts? - http://www.tdkracing.co.uk/
Split Rims? - http://www.force-racing.co.uk/

re the weber bearings, i think you can use the throttle shaft itself as a "puller", draw it through into the choke, put the nut back on, with an appropriately sized washer, and then put the whole thing in a vice with a large socket over the bearing for it to escape into.

it works for su's anyway

also best replace the spindle too if you ise this method

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

Why would you need to separate box and engine to change a camshaft?
slacken the rockers, push them on the side, remove pushrods, turn engine upside down, turn crank two turns to push all fllowers, change camshaft.
Fabrice

New cam, new followers! Can't change them with the box on.

Ive used std turbo cam, MG cam, 286, and the SW5

( 286 with std rockers and the rest with 1.5's )

I rated the SW5 the best cam on my car.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

Look here
http://www.turbominis.co.uk/forums/index.php?p=vt&tid=298936

Just by shear luck this Dc Dodd chap has worked out the timings for cams best suited for a turbo if the Piper cam is anything like the Kent cam then you wont like driving with it.

Had a Kent MD276 in mine last year and I cant say it lit up my world got the mini speed Turbo cam in it for this year and an MG one on the bench.

Again take a look at the figures and what he has to say about the MG cam. There only seem to be three choices.

Own the day