16 valve head info
Turbo Mini Forums

http://www.miniman.com.au/bmw.htm

Metro turbo weekend driver,Mini turbo in the making again!

Looks a lot easyer than I though it would be.

http://www.rabdunn.co.uk/

I reckon the Micra head is a better idea. For a big bore engine,the BMW valve sizes are well short of the small valve KAD head and the JK one. Possibly an improvement over a 5 port though. Might be a reason why Bruno Raouille (the original exponent IIRC) was doing it based on a 970S engine. I don't know what the flow figures are but MadMat using a 1560 engine is a bit beyond the units capability. Fuck knows what cams they are running but they are probably optimised for a short stroke engine (more duration than normal and possibly a little short on lift, I would expect). I suppose the brake results would speak for themselves......Looking at the spec of the head, it's not the sort of thing I would ever consider, hat off to him for doing it though!

Bugger off, I'm getting there.

MadMatt, Fab and I have been doing the conversion for some time now, all projects are at different stage. Great thing though, lot?s of shared information and tips. AKAIK none of these three engines are runners, at least mine is not.

What does it include: Bmw and Mini have wet timing gear. Both are converted to dry setup using cam drive (with pulleys from suitable donor) They, you need to run the BMW cams backwards. This naturally needs new timing for the cams vs. crank as well as some considerations regarding timing order...

Then there?s the matter of moving the head stud locations. Like MadMAtt loves to say: easy-peasy.

Valve sizes then: BMW 16V head has 26,5 mm / 23 mm. KAD road head 27,6 / 23,7. Ancient brochure from JKD: 28/24 mm. For your information Stu, hardly "well short of small valve KAD head". It would be fun if you did some research before jumping into conclusions. BMW cam timing is in 280+ degree range, valve lift somewhere aroung 9-10 mm. I did some research before buying the head and there are several turbocharged BMW bikes running these heads and they have around 200 hp. So there is potential even with a 1275 head. 1560 cc engine may be a bit large for BMW head but so is a 5 porter. Anyway, long stroke engine is not a revvy so most likely it will make hell of a lot torque.

For me the 16V project is just an engineering thing, I am not looking for top hp. It will be eventuaaly completed ...

One thing to add, this BMW conversion was done as early as in 1980?s in USA. There was one turbocharged setup done by late Arlen Jeffries and another n/a setup done by Gregg Temkin. (Hope I remember the names correcty). Gregg used a brand new 8V head for his conversion. Not exactly cheap.

Sorry Jukka, I consider the inlet curtain area of that to still be considerably less. Let's face it I have some funny ideas though. I ran through the maths in great detail, as I'm that sort of sad bastard!

Bugger off, I'm getting there.

Stu - Have you ever seen the underside of any of these heads in the flesh? And you managed to work out curtain area - I'm impressed by your knowledge of primary school math

Jukka IS without question one of the best engineers around in the world mini fraternity, far more so than you or I ever will be; the wise always listen when Jukka talks...
Stick to your micra head son.

Edited by turbodave16v on 1st Mar, 2005.

No Dave, I will stick to my A series heads! One step at a time. By the time I need a Non A series head, I will probably be using a non A series car.

I studied fluid flow quite extensively and a fair part of my degree was engineering related. Still all it gives you is a starting point, Eh? I know I'm short on the practice (but have done loads in the meantime) but my theory is definately up there Trust me on that one!

Edit:- As for the heads, I (sadly) make a point of taking things to bits at the scrapyard for a look, that constitutes entertainment in my book! Found an 8 port crossflow head (with the exhausts by the plugs) which had the right bore centres. 36.5mm In 32 Ex. Had a trial fit on a mini engine and bumped into the BMW paradox, have to mess with the bolt locations. Pushrods were right though. I wouldn't want the exhaust at the front (even though the plug placement is much better in terms of detonation). No idea what it was from though.

Stu (seriously busy at the mo)

Edited by Hedgemonkey on 1st Mar, 2005.

Bugger off, I'm getting there.

Just looking back through some of my old pictures and I cam across my initial trial fitting of the BMW head on a 998 block. 12th of Feb 2005 :) So it must have been about three weeks before when i started looking on ebay for an engine, lol.

I have been at this conversion for 4 years FFS!!!

Did Jukka ever get his running?

Also didn't realise there was a turbo k head a series before mine, wonder if it was 8 or 16v?

Team Racing

Checkout DC putting Stu to rights ! LoL.

WWW.TURBO-MINI.COM

Nope, it´s still in bits. I kind of lost the interest in Minis when my Clubman was having an 18 months long respray... It took another 18 months to get it back together. Now it´s pretty to look at and also comfortable with updated interior. Once I got it back together in August I tore my Minor apart for respray which only took 2 months. Now it´s getting back together before the snow melts.

Besides, having a V8 engines Morris Minor has proved too much fun. Much more fun than a turbo Mini. If only it would be legally possible to stuff two turbos to that engine !

I have not forgotten the conversion, it will be completed eventually. Couple of my mates are building a SC version, one of which is destined to IMM 2009.