BMW K 16v head conversion
Turbo Mini Forums

very nice build indeed jimster.

is your engine n/a at the moment?

J

Pictures here >>> Photobucket

Build diary, No turbo... yet...,here on TMF >>> TMF - My project

Jims right - the LT cams are soft for an n/a road burner engine but ideal for a turbo application with little overlap to them. Jims is turbo'd and I don't think it's struggling to make a lot of ponies out of the box!

John

If Carling made Mini engines
it would probably be like this one!

well im not really thinking about using a turbo on it so RS cams would be best?

so what sort of power could i expect from a mint 1275 k1100rs head everything standard?

J

Pictures here >>> Photobucket

Build diary, No turbo... yet...,here on TMF >>> TMF - My project

yip RS cams are best for powerful n/a's - if the mini engine made as much use of the head as the bikes do then a 100bhp 985cc bike engine would turn into a 127ish bhp 1275cc mini engine - so long as its well optimised for CR, exhaust system, fuelling etc - and has a bottom end that can withstand 8000rpm + - as it'll have to turn this high to make the power! its a theoretical amount of bananas, more in reach if you have the head ported before fitting.

If Carling made Mini engines
it would probably be like this one!

Team www.sheepspeed.com Racing

cool.

What would be best CR for 1275 k110rs then?

what would using my existing maniflow exhaust sytem on an SC manifold be like?

at the moment bottom end is standard, what would NEED uprating to withstand the revs?

So what are the engines like to drive in traffic at low revs? i would intend to use the car as a daily driver.

J

Pictures here >>> Photobucket

Build diary, No turbo... yet...,here on TMF >>> TMF - My project

Hi J - the SC exh manifold requires an inch and 7/8 system - but it will mate up to all the usual mini systems. I would use a balanced bottom end assy, hardened crank + centre main strap as the minimum, for peace of mind I'd cross drill the crank and have it wedged - my opinions only on this. Std rods will be fine - balanced obviously, a set of ARP rod bolts is a must along with a set of VP2 material bearings. On top of this a steel billet flywheel and backplate with an uprated organic plate and orange diaphragm. Pistons - depends on whats in the engine already.

CR - for road use - normal pump fuels between 10.5:1 and 11:1 will get the job done in most instances.

Driveability all depends on how good the engine is mapped - if the engine is built correctly obviously. My highly tweaked 16v idles in traffic easily and pulls top gear from 1500rpm and will pull hard from there. Not what you'd expect for the race profile cams in the engine! - all down to the mapping of the fuel/ignition. If my engine were on carbs + clockwork dizzy it would probably idle at 1.5k and require lots of throttle/ clutch work to drive the car smoothly below 3.5k rpm!

A 1275 with RS cams and well mapped should be a really nice daily driver

cheers

John

If Carling made Mini engines
it would probably be like this one!

my maniflow system is 1"7/8 so thats cool.

what do you think would be the better option buying a 1275 rebuilding it and replacing the above parts or building an engine to take it from new from an engine builder, a 'short' block, so everything minus the head i think.

mech fuel pump is fine then? even with the injectors?

Pictures here >>> Photobucket

Build diary, No turbo... yet...,here on TMF >>> TMF - My project

mech pump cannot run injection

As Iains mentioned, you'll need an injection pump,reg etc to supply the juice.

what you do with the engine depends on how inclined you are to have a go yourself really, as building short blocks takes time and this is what you have to pay for when you buy off the shelf (don't forget you'll need to add the extra time in for putting valve cut outs in the piston).

there are many ecu's on the market which could be made to work with the K conversion - they will all come with some type of base map - hence will take a a little bit of time to get the car going and a reasonable amount of time on the dyno/road for final mapping.

SC will be offering very soon a bespoke wiring loom specifically for the K conversion - 3 wires to connect into the mini only, lots of functionality built into it ready for future upgrades, full dash driver, traction control,launch control etc. and a mapped ecu to suit K engine types.

cheers

John

If Carling made Mini engines
it would probably be like this one!

j-whizzle, if your going to take this sort of conversion on then you really must make sure that you have a reasonable budget in place at the outset or else somebody will be buying the bits off E-bay for a song when you get fed up. Not being rude but I have seen it many times!!!!

I spoke to John's business partner today and to be honest I was deeply impressed with both the attitude of the company and the enthusiasm for the conversion.

A conversion like this however is never going to be "cheap" but I do believe that the SC kit is exceptional value as it really is a one stop shop affair that WILL leave you with a runable engine.

If you don't mind me making a suggestion why not buy the build guide from SC so you can see exactly what is envolved, it's got loads of background info in it about the heads and the bikes they were fitted to as well, so I was told.
I can't wait for mine to arrive.

As for a base engine I'd say probably best to best to go for a fresh unit as a used 1275 will probalby need more than just a glaze break job on the bores anyway (unless your really lucky), probably best to go for an SPi lump as they are cheap and generally not in such bad shape as the fueling control means they are unlikey to have had their bores washed too much.

You could run a dizzy and a set of bike carbs but then you'd either have to settle for a rough drive or go very mild on the cams which wouldn't use the head to it's best.

Please don't take any offense, I am only trying to help.

If it's any good to you I intend to cover the build of mine on this board and will also make the maps available for good old 'squirt when I have them to help people get a motor running. Maybe somebody will beat me too that though.

Good luck.

Every day is a school day ...........

How fast and how expensive ...... the same question...

Yeah have to agree with rogerM, my engine so far has cost me £1200, but i need to spend at least another £300 to finish it. And that is doing everything myself and using a dizzy and bike carbs for starters!! For a build i woud be happy with i reckon spending the same again should do it! The next reincarnation will be much more lairy :)

Pictures here >>> Photobucket

Build diary, No turbo... yet...,here on TMF >>> TMF - My project

antman did you get my last email? if not could you please send pictures to "jwhitehurst@mail.com"

thanks

J

Pictures here >>> Photobucket

Build diary, No turbo... yet...,here on TMF >>> TMF - My project

i did and now sorting the email

j,

couldn't get through on that email address got a failed delivery notification. Take a look at [url]http://www.users.qwest.net/%7Eshuko/ [/url] for some info on other versions of the conversion, i found it very handy to see how other people had done it before formulating my own way.

Anthony

thats the one ive seen before with the 850 and i'd lost the link. its bookmarked now, cheers 'ta.

dunno whats up with the email. could you try sway_dizzle@hotmail.co.uk if you wouldnt mind?

cheers

J

Pictures here >>> Photobucket

Build diary, No turbo... yet...,here on TMF >>> TMF - My project

Hey J
I am starting down this path too,As roger suggested, I have bought the build manual from SC and it is fantastic (note trying to plug for dicount :) )
I have sourced a couple of k100 8v heads and might have a k1100 16v too if i can afford it :(
Heads are becoming difficult to find especially 16v ones, I tried a couple of breakers and they are sold out!
However I think as far as building a fast / race mini this is the ideal conversion, I have just sold my 145bhp honda crx engine so I can do this instead.
Luckily i have a mate who is good at fueling and has friend who build custom ecus so hopefully I can get my head round that!
Good luck with it , I will try and start a build file as soon as I get a chance.
Gaz

wicked!

let me know when you get a build file up.

good luck

J

Pictures here >>> Photobucket

Build diary, No turbo... yet...,here on TMF >>> TMF - My project

I am soo glad i bought my head 14 months ago!! Only cost me £200 for a complete top end, but it has taken me this long to get it as far as i have in my spare time.

i know they have a sale on at the mo , im so tempted its silly, I need to buy a couple ofheads first before i get all the bits to slap it together :)