Which BMW 16v cylinder heads? K1100 - K100 - K1200 - K1
Turbo Mini Forums

Will a BMW K1 engine, also equiped with a 16v cilinderhead do the
job as a good source for parts? (throtle bodies, injectors, cams etc) I know the miniman uses a K1 cilinderhead, are they different form the 1100LT and 1100s ones?

I stumbled across one looking for a 1100LT or 1100RS engine, but these are very hard to find.

Cheers.
Bas


Moved to FAQ and added some words to help the search function
Iain

Edited by iain on 8th Dec, 2006.

Op de bank beleef je geen avonturen

I think that the 16v k100 is the heda that Mini Sprocket used. I have a k1100lt for mine and it fits nicely. As far as i am aware they fit, and even use the same cams as the k1100 iirc.

K100RS 16v from 1990
K1100LT
K1100RS
K1 16v (RS spec cams)- the garish coloured sporty one!
K1200 - avoid the LT from this engine size it has 235 deg cams not good!

all of these 16v heads have identical part numbers for the heads ,RS has 284 deg cams, LTs have 254 deg cams and less lift than the RS cams

K100 = 8v from mid 1985-1990 are the ones to use - exactly the same architecture as the 16v and they have 284 deg "16v RS" spec cams throughout the range.

Injectors are the same throughout the range as well - all 16v's have 34mm throttle bodies, 8v has 33mm throttle bodies

that about covers it!

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

Great info John!
Maybe this posting shoud be moved to the FAQ section

Cheers

Op de bank beleef je geen avonturen

so which one would you source first? just wondering which is the better out of them heads?

john ,
I have a different info than your,
the 256 cam are std in all 1100(lt rs k1) engine
and 284 in the k100 ones (rs lt)

284 higher lift ones wouldn't be best for a lower rever, as they could push the rev band too high ,the 256 cam will give a power band more in the a seri possibility.
a four valver generally need 20° less than a two valves for the same power band (the 256 have a 276 cam comparison and a 284 compare with 304° cams)

Is there are way to tell them apart, serial number perhaps ?

Fab - yes mistake on my part - the K1100 LT/RS have numbers 1131464510/512 inl/exh and are quoted as 254°

the K1/K100rs 4v have numbers 1131461691/93 and are quoted as 284° - these are interchangeable with the K1100parts.

The K1200RS/GT have the same cams as the K1/K100RS.

apologies for the confusion.

John

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

That is interesting.

Basically what we are saying is that for a turbo application you'd probably want a K1100 inlet cam and a K1/K100rs exhuast cam timed so that there is minimum overlap and the useful valve open period optimised.

Is there anything, short of a custom grind, that can be done to achieve something similar for the 8v???

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

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

Roger - maybe you could run more clearance between cam and the buckets? This will knock the duration down by a significant amount at the overlap; and you might not even notice any increase in noise over the drops / transmission / dump valve / turbo whistle anyways!!!

LOL ......

I was actually refering to, as I'm sure your guessed, if there was any off the shelf cams for the 8v motor that could shorten the inlet duration .....

The K head is going in my car ..... noise won't be an issue in that as it will probalby do as many miles next year as it did this ZERO .. LOL

Edited by RogerM on 11th Dec, 2006.

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

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

bimi heads are well balanced you don't need/want longer exhaust.

Jukka,what's writen on yours? but sure it was from a k11
1100/256 are marked 461368 , sometime marking is difficult to read, mesure the lobe accross the lobe lift diameter and base diameter for 256 8mm lifts are 38/30

Well you got me thinking earlier today and went down in the garage to check. I was actually going to post a question asking what my cams are. Fab has already answered my question: they are indeed 461398 cams.

Fab, from the figures it does look like a balanced head flow wise but would it still not be better to keep overlap relatively low but exhaust duration relatively high? It's not so much wanting to have a longer exhaust as thinking there would be a benefit from reducing overlap which, if done on similar duration cams, would mean that the inlet would have to be opened very early.

This is common practice in other motors such as the VW 16V when using a turbo.

It sort of stands to reason in my mind as the exhaust efficiency is important to the overall performance and overlap is not too helpful as you could either end up throwing charge down the exhaust or having charge reversal and preventing full scavaging of the cylinder ....

I'm going to have to go and dig out my old text books from when I was at uni ..... been a long time since I have had to think about cams for forced induction SI engines.

Edited by RogerM on 11th Dec, 2006.

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

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