14 replies to this topic

[oltonlad]

hi all, i have been offered this cylinder head, its a 1098 head but it looks to me like the chambers have been de-shrouded, can anyone confirm this please

thanks.

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[Spitz]

De-shrouded?\

What is the number on the head ( up in the valve spring area )?
The "beak" on #3 does look slightly sharper than the others.
I thought the 1098 used the same head as 998...maybe the older ones used 12g206 or 202.
The intake valves also look to be larger than stock 998 ( so maybe it's a 206 head )

[Cooperman]

It does look a bit de-shrouded to me, although it could do with a bit more removed around the 'beaks'.
You will need to measure and calculate the compression ratio, but I guess you know that already, then get the head skimmed as necessary to get the C.R. you want. A head from a 1098 can be difficult to get right if you have dished pistons as there may not be enough 'meat' on the head to allow sufficient skimming. With flat-top pistons it's not normally an issue.

[oltonlad]

De-shrouded?\

What is the number on the head ( up in the valve spring area )?
The "beak" on #3 does look slightly sharper than the others.
I thought the 1098 used the same head as 998...maybe the older ones used 12g206 or 202.
The intake valves also look to be larger than stock 998 ( so maybe it's a 206 head )

the head is a 12G 202 (1098 head), the "beaks" in the chambers are normally a lot sharper than the ones on this head, the 1098 uses a 12G202 head as standard but it looks like this one has been modified.
it also looks like the ports have been opened up too, i was looking at the #3 chamber and it does look slightly different to the others, surely the chamber cc would be different on number 3 due to this?

[oltonlad]

It is a 202 which was standard on other A series engined cars in the BL range, just never on 1098 minis..........

quote from somerfords website

"the mini 1098 cylinder head design also saw use on several other engines including the austin/morris 1100 , the 948 austin healey sprite mkII/MG midget mk1 and the 997 mini cooper. for identification purposes the casting number is 12G202 and the inlet valves are 1 5/32" (29.4mm) diameter."

every mini 1098 engine that i've ever had has had the 202 head fitted....unless every one of those 1098 engines that i've had were mis-built.
i purchased another 1098 engine 2 weeks ago (it was from a mini 1100 special) and guess what...............it had a 12G 202 head fitted.

[Spitz]

"by the time the 1098 made it into the mini it (12G202) was dropped for the cheaper standard 998 head"

Well if that's correct...then I was right in my first post.....and know more than both of you!...so there...LOL
Now go to your corners!

[oltonlad]

another quote........ from the mini cooper register this time..............i suppose these are all wrong as well then!!

The 12G202 was a standard 1098 head (1100/Minor/Clubman/Allegro etc) and the very similar (well, nearly identical) 997 Cooper head is the 12G185. The only difference is that it has machined inlet ports to take locating rings for the twin SU alloy manifold and the 12G202 doesn't.

[JustSteve]

another quote........ from the mini cooper register this time..............i suppose these are all wrong as well then!!

The 12G202 was a standard 1098 head (1100/Minor/Clubman/Allegro etc) and the very similar (well, nearly identical) 997 Cooper head is the 12G185. The only difference is that it has machined inlet ports to take locating rings for the twin SU alloy manifold and the 12G202 doesn't.

That's just confirmed what I have been telling you, why not try reading these quotes you keep finding......... You need to get it out of your head that the 1100 was a mini, go do a search for ADO16.............

A clubman is a mini, is it not?

[oltonlad]

ok, why dont you read the quotes as well then.............i'm sure that it says "clubman" in this quote...........does it not?

The 12G202 was a standard 1098 head (1100/Minor/Clubman/Allegro etc)

and if you read back then you will see that the 997 cooper head was a 12G185 casting......which has the cut outs machined into the inlet ports to take the locating rings for the twin SU alloy manifold..........the 202 heads do not have that...............so it looks like the 202 head was never fitted to the 997 cooper anyway!!

i know exactly what an ADO16 is...............you are the one that is totally missing the point.

[oltonlad]

another quote........ from the mini cooper register this time..............i suppose these are all wrong as well then!!

The 12G202 was a standard 1098 head (1100/Minor/Clubman/Allegro etc) and the very similar (well, nearly identical) 997 Cooper head is the 12G185. The only difference is that it has machined inlet ports to take locating rings for the twin SU alloy manifold and the 12G202 doesn't.

That's just confirmed what I have been telling you, why not try reading these quotes you keep finding......... You need to get it out of your head that the 1100 was a mini, go do a search for ADO16.............

A clubman is a mini, is it not?

my point exactly steve.............

[oltonlad]

A clubman is a mini, is it not?

1100 (ADO16) is a model, the clubman was not called the '1100'..............

Sorry missed that bit the cooper register is wrong, as if thats a surprise...........

what the hell are you going on about??

the clubman was not called an 1100???.............no it was called a mini clubman........i really do not understand what you mean..........at the end of the day the 1100 engined mini clubmans and the mini 1100 specials all had 12G202 heads fitted........

The 12G202 was a standard 1098 head (1100/Minor/CLUBMAN/Allegro etc)

there..............i've even underlined it for you!!..........................

oh....and the mini 997 cooper never had the 202 head fitted either............the head on a 997 cooper was a 12G185.

Edited by oltonlad, 15 March 2012 - 09:10 PM.

[lrostoke]

No idea if this info is correct but it may add to debate

http://www.calverst....casting_ no.htm

According to Haynes the 10H engines had an inlet of just over 29mm

Only casting in the calver list that matches is the 12g202

[Mini Mad Drakeley]

i was always under the impression that all the 1100 engines fitted to any mini had the 12g202 heads. its the only head ive ever seen, read about or heard about that was fitted to it, a mate has a standard extremely rotten 1100 special sitting in a field, i took the rocker cover off and it was a 12g202 head aswell

[Mini Mad Drakeley]

just because it wasnt in production doesnt mean they didnt have a stock of them available after, they could have stopped production due to having made more than they could use and then found a use with the clubmans and 1100 specials

back to original topic, i would say its had a wee bit of work done to it

[pdaykin]

Pretty sure that my 1100 mini engine was fitted with a 202 head - sadly cant check as I dont own it any more.