Blow Through Supercharged 1232CC A Series
Turbo Mini Forums

So I know it's not a 998 and it's not turbo but it is at least forced induction so I was hoping some of you guys could help critique and develop my proposed engine set-up.

I'm far enough through the metal work phase on my Clubman Estate that I'm starting to think about engine specs. I'm looking to build a good strong engine with plenty of torque for cruising to shows with enough spare power to have some fun if you know what I mean.

Here's what I'm thinking:
Eaton M24 supercharger from a 1.4 VW TSI lump
Pocketed 1098 A series block bored to 1232 for +0.020" (68.45MM) Imp pistons
Centre main strap + de-stressed front and rear main caps
Hardened + cross drilled 1098 crank
De-stressed + shot peened 1098/998 rods
Block re-drilled and tapped for 5/16th fittings
Ported and polished MG Metro head (maybe an MPI with a high mounted alternator)
Kent 266 or Swift tune SW5 cam
Isky drilled cam followers
Titan oil pump
+0.020" (68.45MM) Imp pistons
Intercooler mounted behind the front valance vents
Front mounted MK2 Golf alloy radiator
Mini Spares X-pin differential
Fully rebuilt box all bearings, bushes ect replaced
Competition bulk rings

I've given a lot of thought towards fuelling and would like to run an injection set-up like the Specialist Components offering but need to do some more research into it.


Working at a Mini specialist and coming from a long line A series racers I've got most of the key elements to hand but have little experience with forced induction hence my appearance here. Please feel free to tear into my spec and point out any flaws.

For those who aren't on TMF this is my Clubman Estate project thread. http://www.theminiforum.co.uk/forums/index...howtopic=145101

I looked at your thread and found this:



I've got the same rad in my GT :)

You seem to be looking for a high horsepower result, but the M24 has a capacity and rev limit that will only provide enough air flow for 120hp.

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=447065

Personally, I would not risk wet manifold injection on a setup that will be prone to detonation due to high inlet charge temps.

Edited by Paul S on 22nd Nov, 2011.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

There's an orange clubman in the December minimag.

He's running basically a standard mpi engine with a small amount of head work done, an M24 charger blowing through an MPi manifold managed with a custom ECU. He sees 112bhp and 125lb/ft on 14psi at about 3000 rev's. He had to fit an intercooler as the intake temperatures where around 120 degrees. He can't rev past 4500 rev's, but that may be due to his efi setup.

That's the one Jeff was talking about in the link ^^^.

I think that he must have geared the M24 a bit too high if he is getting 14psi. Not sure why it wont rev but I suspect that if he goes over 4500rpm, he could be in danger of the blower disintegrating.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

I didn't read the link. It seems like that charger isn't great for our application. I'm assuming that VW only use them at low rev's as they have an internal gearing system to multiply the input rev's. I guess at more than 4500 it's spinning far too fast for it's own good.

This story of internal gearing seems to have come from someone at Eaton and seems to have traveled far and wide around the web.

However, my M24 has a VW logo on the casting and it has no internal gearing other than the phasing gears. Also, all the photos on the web suggest that the "gearing" is at the crank end of the blower drive.

Interestingly, the 1.4TSi disengages the blower at 3500 crank rpm.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

looking at this picture, I think you might be right. Doesn't seem to be any internal gearing other that the sprockets to rotate the rotors.

Ackershly Andy those gears labelled "Vorgelege" do not look equal size. Not 1.93:1 though. Plus there is no need for 2 sets of phaing gears. Interesting.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

If the top shaft is actually two parts, the top right gear driving the bottom right gives the speed increase (initially to the bottom rotor) then the left hand two gears keep the rotors in phase.....

Agreed it doesn't look like 1.93 though.

Edited by Rod S on 22nd Nov, 2011.

Schrödinger's cat - so which one am I ???

Edited by Paul S on 22nd Nov, 2011.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

vorgelege translates as 'pre-lay'

Wow thanks for all the replies guys, I'll have to do some more reading on the finer details of the M24 and what it's capable of. I can't see me ever taking the estate round a track or down a strip in anger so limiting the revs shouldn't be an issue.

Edited by Tupers on 22nd Nov, 2011.

If you are not looking for anything more than 90 odd hp, then you can reduce the cost of your engine considerably.

The above spec with a GT1752 turbo would probably be capable of 150hp.

Have a look at my Budget 998 Turbo build in the Show Us Yours section.

Have you considered port injection, much safer than wet manifold, in my opion.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Wouldn 't a T2 set-up get those numbers with not that much lag.

Don't get me wrong, if your set on an SC and your up for a project then absolutely go for it.

Dazed and Confused....

Edited by Tupers on 27th Nov, 2011.

Have a read of this:

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=408438

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Thanks for the link Paul, my brain fell out a few times while reading it but I think I'm starting to get my head around it.

It's best to be aware of the issues. There's some more here:

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=360180

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Do you know what the max inlet temp is you can run on a wet manifold system before you run into detonation issues?

In the article about the polish fellas Clubman it says he's got his inlet temp down to 40*C with the intercooler.

I don't think that anyone can answer that as it depends on the AFR of the outer cylinders which you wont know until you build it, nor will you be able to do anything about it.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

This should interest you:

http://www.turbominis.co.uk/forums/index.p...tid=242798&fr=0

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."