what to do 998 turbo or 998 bmw head
Turbo Mini Forums

hi guys been reading loads of you engine builds and projects but i cant make up my mind about what to build. should i build a 998 turbo motor or bmw headed 998. as i work for fords in a engine build plant i do know my way around a motor so putting it all together will be no problem.

so turbo motor.
12g295 head
turbo
inlet
exhaust
etc...

or bmw head.
k100 8v head
inlet
exhaust
etc..

oh and has anyone cad drawing for the bits i will need to make.

cheers terry

another option for you....

1.2 fiat fire head, already has a belt so less work than the bmw head.

Or put a 12G940 head on the 998, much easier than a conversion and cheaper than a 295 head.

Or you could put both your ideas together and have a real terrorist to race around in.

Life is always a matter of opinion and quite frankly, no ones opinion really matters.

Fitting the k head on a small bore head needs lots of machining. K heads are better on large bore engines. If you want to keep it 998, then short stroke is the way to go.

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

so turbo motor.
12g295 head
turbo
inlet
exhaust
etc...

if its your first turbo mini .....i would go the above way ....... alot of peeps first off get sort of bogged off doing a over engineerd project FIRST and throw the towle in

dont fall in to the trap

What Benross said :) start small!

Sc billit 7port? 998

Or short stroke k12 supercharged to be different

Drives
-Ford S-max Mk2 Ecoboost
-Rover 100 VVC #2 - track project

Searching is all you need on TurboMinis

295 heads are relatively rare and expensive. 940 heads are cheaper and more plentiful

thanks for all your ideas guys.. but i think i've made up my mind on....... a k100 head motor. gonna start and try to get bits and build one over next year or so...as i work building jag v8s all day how hard can it be to build a a series.....

cheers terry

Alot harder than you think. Spesh on a 998 only seen one guy who's done it and still he hasn't finished it yet

Was it not a guy over in the US who had a smallbore K???

www.shag.no

Miniboo in the US was building one, but I am unsure if he finished it?

Was a guy in Mini mag in July 2010 Issue

Had Road Rage on the front cover and In on the job section 3 pages on Darren Woodhead's Project Kylie

A 998 with a 8 Valve k100 head built between him and SC

he said

"Its been taken out to 1060cc using offset pistons, witch also ment we had to alter the crank and conrods"

Or a 1275 turbo. A not too far from standard engine put toether correclty with a few choice bits will produce good power levels on a low boost threshold. Just removed my turbo engine, it was a near standard non turbo motor build up of mainly second hand parts, made 130 bhp at 10 psi, totally reliable

I think the fact that Terry builds engines for a living means he is a little more ambitious than some of us.

Although I agree that it is a complex build, it is far from impossible. And will result in an interesting motor. All be it much less powerful than a decent 998 turbo.

good luck with the build and keep us up to dat with progress, please.

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

Are you set on a K head? Im sure their must be other heads out there that will fit a 998 block without too much hassle. Hard part is finding em i suppose.

What's the target ?

Street cred' of building something very special or the very good power to money ratio a 998 turbo is ?

Rusty by nature

for the work involved in fitting a k head to a 998 block and the size of over bore/offset needed to do it, you need to think carefully. piston choice is limited, because of the bore size required, which also means limited if any opportunity to reborne in the future.

As you know from being an engine builder, building an engine is full of compromises, whether it be cost, availability of parts, or ultimate use if engine. when you way up the amount of compromises needed to fit the k head to a 998 block you end up with a great engineering exercise but not necessarily a great engine.

for the cost of building an 998 engine you could be build a short stroke 1275 lump, with super light weight internals.

is the engine an engineering exercise or something to give good power?

Edited by matty on 5th Mar, 2013.

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1/4mile in 13.2sec @ 111 terminal on 15psi

I agree, the only propper way to do a 998 with a K head is a 970 overbored to 998.

The short stroke will work perfectly with the head, much like the bike it cane off.

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

why not got for short stroke 1275 std bore, head will bolt on without issues, although a crank will cost a ffew quid.

Team Racing

How much is a billet crank out of curiosity ?

Rusty by nature

Swiftune crank £1554 dreaded included.

hi gents. i've been talking to my brother(grey shorty in mini mag) and he reckon turbo is the way to go on the 998.. so thats the route i'm now taking. i'm still gonna do the k head motor but need to have fun in mini first.. so anyone got turbo bits and bobs let me know..

cheers terry