53 replies to this topic

[miniboo]

mic which thread did you read about the rover k series head?

[scottyegg]

the head which fit might not be all of them

any five port mg/mini head

7 port
8 port

kad 16v head
bmw 16v and 8 v heads

the jdk or jkd 16v head

[smudger]

but we are now after what head fits from other car/bike.

i understand the mass intrest with the BMW K Head, now that Morspeed/SC are doing em in kits and built form, but what other head?

Common Mini Sprocket, which other one!

[Sprocket]

When i said there were three heads that fit, i was talking about the 16v variants(BMW, KAD and Jack Knight), as why else would you go to the trouble fitting a SOHC 8 valve head. Of course there are plenty of other 8 valve heads that fit some a direct fit and others that need extra work or special parts, to work.

Please dont think i was being derogatory in any thing i said, it was not meant like that

It was last year that i was looking at the Nissan Micra 1.0litre head which crtainly looked a good bet. I happend to bring this up in a conversation and i think it was on this forum (maybe a search will dig it up). May be i was the first to mention it and people listened, i dont know, but i have not heard of any one else talking of this. Unfortunately it does not fit, its close but not cose enogh to be anywhere near working it right.

[mic]

mic which thread did you read about the rover k series head?

was this one http://www.theminifo...amp;hl=bmw head

if there was a bolt-on alternative then yea, it would just be 'the way' - its obvious theres gonna be an amount of work required to make fit etc. but then, surely out of all the makes and models of all cars AND bikes there must be a variety of heads that can fit 'with work' as they like to say.

i just dont know which ones they are!! is it possible to do a google on whatever size the valves needs to be to find out what head has valves etc the same/ish size?

i.e. google - cylinder head valve ....... distance maybe?

[mic]

Of course there are plenty of other 8 valve heads that fit some a direct fit and others that need extra work or special parts, to work.

Please dont think i was being derogatory in any thing i said, it was not meant like that

no offence or anythin taken mate i appriciate all help!

so then, pray tell, which 8v heads are a direct fit

Edited by mic, 08 July 2007 - 12:13 AM.

[miniboo]

well most of your answers are in that thread added to a few of them in this thread.

one of the replies in that even says that it is impossible to fit a rover k series head to the A series engine.

[smudger]

but a few years ago, they said you couldnt fit a BMW K Head either!

As Sprocket says, just need time and engineering skill.

(Oh and money)

[Sprocket]

Unfortunetly there is not any other head that is workable. The reason this is, the A series bore spacing is very compact, infact, there is only 2.5mm between the bores on my 1400, that is waffer thin compared to the engine designs that utilise 16v heads.

If you look at it this way, the A series has been around for 40 odd years and in those years every engine configuration , conversion and modification has been looked at, done or modified, by many many a technical person. Fitting another head from anothe engine of a different design, If it could have been done it would have. It has been done and that is the BMW K bike head.

bespoke designs are just that, designed specificaly to fit where others dont.

There is no easy or cheap way out

[Sprocket]

but a few years ago, they said you couldnt fit a BMW K Head either!

As Sprocket says, just need time and engineering skill.

(Oh and money)

Few years??

how about 18 years to be precise, about the same time ago that the first bespoke 16v by KAD

[mic]

well most of your answers are in that thread added to a few of them in this thread.

one of the replies in that even says that it is impossible to fit a rover k series head to the A series engine.

yea, my first post said i didnt want to drag an old post back up and my question was 'why is that?' as i wasnt sure why...

[smudger]

wow, 18yrs!

I just thought it was in the (thinking back, erm say something in 96 i think, from switzland) last 10yrs, which is very short time span really.

So, just the BMW K Head so far then?

[mic]

Unfortunetly there is not any other head that is workable. The reason this is, the A series bore spacing is very compact, infact, there is only 2.5mm between the bores on my 1400, that is waffer thin compared to the engine designs that utilise 16v heads.

but you just said 'Of course there are plenty of other 8 valve heads that fit some a direct fit and others that need extra work or special parts, to work.'

so which one is it? lol

[mic]

so in theory if i took a head gasket to a scrapyard and put a head from any other car to it, as long as the valves were inline with the gasket it could potentially work?? time might be an issue if you have to unbolt 20 heads to check minds, but in theory would that be one way to check it its workable?

[Sprocket]

wow, 18yrs!

I just thought it was in the (thinking back, erm say something in 96 i think, from switzland) last 10yrs, which is very short time span really.

So, just the BMW K Head so far then?

Well ok, the BMW K100 8valve head was first fitted by an American to an 850 block bored out to 67mm. However the same year BMW released the K100RS 4valve. The head is the same architecture, hence why i said 1989. so i supose its not strictly true but it is

I believe you to be thinking of what a certain person of a cetain company has said on their web site, which is not strictly true. It was not Miniworld that it was first published in, it was infact Car and Car Conversions magazine (lets see if the info on that site changes after i have posted this), one month before. It was indeed 1996, and the chaps name who did this conversion was Bruno Rouille, a French engineering student working for Sothern Carburetors (SU, also now known as Burlen Fuel systems)