xr-stu

Would the frs clutch bolt up directly to a duratec flywheel? Specifically the mk5 fiesta ST?

XRT_si

iTrader: (2)

The Focus RS clutch is 240mm and I'd guess the Duratec one would be 220mm as it uses an IB5 gearbox.

xr-stu

I used one successfully on a silver top years ago though and I believe they were also 220 as standard.

XRT_si

iTrader: (2)

Depends which one it was, but Focus RS clutches are definitely 240mm. A standard 2.0-litre Zetec uses an MTX gearbox and a 240mm flywheel/clutch set up and a 1.6/1.8-litre Zetec uses an IB5 gearbox and a 220mm set up.

xr-stu

yeah iirc i used the 2.0 flywheel as i also used the mtx box.

possibly not then?

XRT_si

iTrader: (2)

Saying that, just remembered the Duratecs fitted in Mondeos did come with an MTX at one point, which would have used a 240mm clutch. Though I very much doubt the bolt pattern would be the same.

xr-stu

i would presume the bolt pattern would be the same? there is always 6 bolts (from the engine ive messed with, old OHV stuff upto my puma engine) and ive fitted various different clutches between engines, got knows what my current clutch is but its 10mm wider and works....ive got an ERST one spare and that fits aswell.

the ST is an IB5 box is it not? from what i remeber about converting mk1/mk2 fiestas to zetecs, you cant use a 2.0 flywheel because it doesnt fit in the BC box. ive no idea if the same is true for an IB5? its based on the BC box i know that, but not sure on differences bellhousing wise.

Davemurphy007

The genuine Duratec engines (Mk3 Mondeo, MK2 Focus, Fiesta ST) are Mazda engines and the bolt patterns for the gearboxes are COMPLETELY different. Yes Ford (in their infinite wisdom) refer to the gearboxes as IB5+ boxes but they have nothing in common with the earlier IB5 family boxes as fitted to Zetec engines.

No idea on the OP's question about clutches and flywheels but as people are using the gearboxes as a reference point just wanted to throw that in there. Damned Ford naming their stuff confusingly.

xr-stu

so do you mean the ST uses an mtx box (effectively)?

if so then in theory it would....lol

alot of ifs buts and theorys

xr-stu

http://www.ebay.co.uk/itm/Fiesta-ST-...item3cdc9defd7

that doesnt look like an mtx box to me, the one i have in my workshop has the hash type ribs throughout the casting. infact the more i look at it, its definitely what i would refer to as an ib5. as in based on the old bc box. drain plug, vent in the top (or whatever the little plastic tube is)

XRT_si

iTrader: (2)

Yes, the ST150 uses an IB5 gearbox with a different bellhousing/bolt pattern. It depends what you're trying to do as the MTX gearbox uses a different centre spline too, so the MTX clutch won;t fit on the IB5 shaft and vice-versa. The BC box and IB5 are virtually the same gearbox, which is why you restricted to a 220mm clutch/flywheel.

I always understood that the internals of the Fiesta ST150 IB5 gearbox were the same as other IB5 'boxes. Sure I heard people who have swpped parts between an ST150 IB5 and a BC 'box? Might need someone to confirm that.

No, the ST uses an IB5 (or some form of it) 'box for sure. So it's essentially using an BC gearbox so all the same problems as the Mk2 Fiestas you're used to! Lol

xr-stu

ive got to say ive done a shite job of saying what i actually mean, my bad. i was aware the duratec had to different bolt pattern to the zetec-e and all other preceding engines, the bolt pattern i was talking about was the clutch-flywheel.

seems pretty obvious as the ST box is an IB5 the focus rs clutch wont fit. for some reason i thought it might but its all clear now.

regards the fiesta ST box, im pretty sure i read somewhere it has 'stronger' internals, presumably better bearings, thicker shafts or something along those lines?