Crankshaft
Turbo Mini Forums

Hi Guys,

Im building a 998 supercharged engine for my dad, he wants to be able to rev the nuts off it from time to time so i guess it needs building as a screamer.

Now my dilemma is what to do with the crank, obviously it wants lightening for a bit of extra acceleration but is it worth wedging and all that malarky???

Oh and whos the best peeps to talk to about getting it done for sensible money? I think MED wanted 250 to machine my crank but cant remember what that was for now............

i think the only debateable thing is blading as it removes the counterweight, as far as the rest of is concerned it can only help, but to be only, as the 998s a tough little cookie already, i was just going to get mine hardened and balanced.

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

"did you know you can toast potato waffles?"

MED will be one of the cheapest for crank work, Fastcarl on here might be able to beat them though

Paul

I seriously doubt it!

So, x-drill, lighten, wedging and tuftriding then

What is considered revving the nuts off?

Standard crank is fine to 7k no probs. A grind and harden would be the most I would do.

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

www.twin-turbo.co.uk

When you say grind what do you mean?? I want it to survive to beyond 8K in short bursts, was thinking if it was lightened it would pick up that little bit quicker???

I just meant grind the journals before hardening them.

8k, wow. Well I must admit that my 998 sees 8k occasionally (ususllay by accident!) but generally 7k is a maximum.

What's your planned spec for the engine otherwise, blow through, suck through, cam? head? CR etc.

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

www.twin-turbo.co.uk

Oh I see LOL
The journals look fine (low mileage engine) but I will give them a good going over with a micrometer to check for ovaling.

Basic spec is blow thru Injection, MG metro cam and a well ported 202. I havent worked out the CR yet as I dont know how much meat can be taken out of the head or dished into the pistons.

Aiming to use a M45 and max it out at 15000rpm at 8K engine revs so about 1.9:1 ratio.

Maybe a Canems ECU or megasquirt to control it all.

Sounds ok or am I stoopid???

I always get confused trying to calculate psi on an SC engine. However, running an M45 at 15000 rpm will pump enough air for over 200bhp at 8k on a 998; which is maybe a little optermistic. This would also be at 30 odd psi, which is way beyond the capabilities of the M45.

For a more sensible/achievable 120 to 130 bhp at 8k, you only need a bit over 300lb/min, which you'll get running the SC at 1:1.

Someone might want to check my maths though.

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

www.twin-turbo.co.uk

See, thats why I like this forum!!!

Or shall i try to get 200nanas LMAO

Oh and what sort of size intercooler would be a good addition??? Was thinking something like the Audi S3 one about 10" square I guess and quite thick.

You'll be running about 60% efficient maybe a little better lower in the rev range, so the bigger the better.

10" and quite thick would keep most of us happy I guess, not sure about it being square!!!!!!

Sorry, couldn't help myself.

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

www.twin-turbo.co.uk

With all Carl's TI butt plug work he probly likes it closer to 12" but he is a bit special

11 posts before it went 'of topic'. That's pretty poor.

usualy only takes 3 or 4...

OK, will see what size I can fit in there then, I thought 10" square was being generous, I wouldnt be able to walk properly for weeks after that girth LMAO

And Ti a, now your just being pervy.