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PostPosted: Thu May 11, 2017 5:04 pm 
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848cc
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drmini in aust wrote:
Gearbox is basically the same but you would need a 1275 auto primary gear.
And it needs to be a 1275 auto block, as the much wider auto oil pump won't fit in a manual one.
Auto's oilways are different too.



What "primary gear" do you mean mate? I will get auto box and 1275 auto block ( as the one im going to get is 1275 spi)

is there anything else i need to get before it will go in?


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PostPosted: Thu May 11, 2017 5:08 pm 
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You only need to think about the primary gear if you're swapping a 1275 engine to the 998 gearbox. If you've got a complete unit no need to worry

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PostPosted: Thu May 11, 2017 5:33 pm 
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timmy201 wrote:
You only need to think about the primary gear if you're swapping a 1275 engine to the 998 gearbox. If you've got a complete unit no need to worry



Awesome thanks mate!


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PostPosted: Thu May 11, 2017 7:04 pm 
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I've heard that worked 1100 engines will kick Cooper S cars to the ground.

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PostPosted: Fri May 12, 2017 5:57 pm 
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848cc
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TK wrote:
I've heard that worked 1100 engines will kick Cooper S cars to the ground.



ah wow really?

All I really want is something that is going to give me more power, but that isnt going to cost me 4-5k to get that power.


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PostPosted: Wed May 17, 2017 5:14 pm 
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Location: the inner west of sydeney!
1100, 60+ over (hell, make it 100 over) RE(whichever, 13, 83, 226) opened up head (worked 202 or 295), a decent exhaust and a HS6/HIF44/weber hanging off the back of it will be well and truly a decent power package (60hp atw) and torque up the waaaazoo.

source it right and youll get away with maybe 2-3k

best part, break the block, get another one off the pile (small bore blocks are a dime a dozen)

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PostPosted: Mon Aug 14, 2017 10:26 pm 
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848cc
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Alright so I'm bringing this up again haha.

I'm sticking with my 998 auto.

Where can I source a good 1098 crank and also would it be wise to get a 1275 or 1100 head?


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PostPosted: Mon Aug 14, 2017 11:00 pm 
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dawi03 wrote:
Alright so I'm bringing this up again haha.

I'm sticking with my 998 auto.

Where can I source a good 1098 crank and also would it be wise to get a 1275 or 1100 head?
MKO sell 1100 cranks if you get stuck.

$110 https://minikingdomonline.com.au/produc ... ight-sale/

$341 https://minikingdomonline.com.au/produc ... -exchange/


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PostPosted: Tue Aug 15, 2017 6:22 am 
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I would not put a 1275 head on an 1100 automatic, the valves and ports are too big for good low down torque. Which you need, because stall torque of the converter is 1800 rpm or less and this is difficult or impossible to increase.
Standard head on a 1098 automatic was a 12G295, if you can't find one I would use a 12G202 and get it ported.

(Edit) I have built 1098s with 12G940 1275 heads, they give good top end power but as said low down torque suffers.

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PostPosted: Tue Aug 15, 2017 6:46 am 
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848cc
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drmini in aust wrote:
I would not put a 1275 head on an 1100 automatic, the valves and ports are too big for good low down torque. Which you need, because stall torque of the converter is 1800 rpm or less and this is difficult or impossible to increase.
Standard head on a 1098 automatic was a 12G295, if you can't find one I would use a 12G202 and get it ported.

(Edit) I have built 1098s with 12G940 1275 heads, they give good top end power but as said low down torque suffers.



Hi mate I have a 998 auto not a 1100

I was thinking of finding a 12g295.

And then putting a 1098 crank in too.

Not sure what else I could do?


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PostPosted: Tue Aug 15, 2017 8:27 am 
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Your 998 will be a 1098 once the crank is fitted, why I suggested this head, which is same as was used on 998 Cooper and MG1100.
Don't use the 998 auto head- its valves and ports are too small for a 1098.

Note you will have to change the pistons too, as the gudgeon pin to crown height is 3.75mm shorter on a 1098.
Might as well bore it to +.080" or +.100" then, for even more cubes. :wink:

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PostPosted: Tue Aug 15, 2017 9:01 am 
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848cc
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drmini in aust wrote:
Your 998 will be a 1098 once the crank is fitted, why I suggested this head, which is same as was used on 998 Cooper and MG1100.
Don't use the 998 auto head- its valves and ports are too small for a 1098.

Note you will have to change the pistons too, as the gudgeon pin to crown height is 3.75mm shorter on a 1098.
Might as well bore it to +.080" or +.100" then, for even more cubes. :wink:



Ok so 1098 crank

12g295 head bored out 80 thou... That won't cause head gasket issues will it?

And will the auto still be ok to handle the power increase?


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PostPosted: Tue Aug 15, 2017 1:36 pm 
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dawi03 wrote:
drmini in aust wrote:
Your 998 will be a 1098 once the crank is fitted, why I suggested this head, which is same as was used on 998 Cooper and MG1100.
Don't use the 998 auto head- its valves and ports are too small for a 1098.

Note you will have to change the pistons too, as the gudgeon pin to crown height is 3.75mm shorter on a 1098.
Might as well bore it to +.080" or +.100" then, for even more cubes. :wink:



Ok so 1098 crank

12g295 head bored out 80 thou... That won't cause head gasket issues will it?

And will the auto still be ok to handle the power increase?

No head gasket issues at +.080"
998 auto box is basically same as the 1275 one was. No problems there.
I used to own another MiniMatic with a 1275 motor and twin HS2 carbs off a Cooper S.

ps. it's the 998/1098 block that's bored out to +.080", not the head. You can even go to +.100".
but beyond that (offset bored to 68mm) you would need a 1275 gasket and some mods to the water jacket holes to suit.

[edit] +.080" bore and a 1098 crank gives about 1166cc.

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PostPosted: Tue Aug 15, 2017 4:39 pm 
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848cc
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drmini in aust wrote:
dawi03 wrote:
drmini in aust wrote:
Your 998 will be a 1098 once the crank is fitted, why I suggested this head, which is same as was used on 998 Cooper and MG1100.
Don't use the 998 auto head- its valves and ports are too small for a 1098.

Note you will have to change the pistons too, as the gudgeon pin to crown height is 3.75mm shorter on a 1098.
Might as well bore it to +.080" or +.100" then, for even more cubes. :wink:



Ok so 1098 crank

12g295 head bored out 80 thou... That won't cause head gasket issues will it?

And will the auto still be ok to handle the power increase?

No head gasket issues at +.080"
998 auto box is basically same as the 1275 one was. No problems there.
I used to own another MiniMatic with a 1275 motor and twin HS2 carbs off a Cooper S.

ps. it's the 998/1098 block that's bored out to +.080", not the head. You can even go to +.100".
but beyond that (offset bored to 68mm) you would need a 1275 gasket and some mods to the water jacket holes to suit.

[edit] +.080" bore and a 1098 crank gives about 1166cc.


Awesome thankyou.

Thats what Ill aim for in the auto :)

Is there anything I can do to the 12g295 at all to get improvements or is there no real need?


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PostPosted: Tue Aug 15, 2017 6:30 pm 
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No real need but if the exhaust valve seats are worn I would get unleaded seats fitted. And new exhaust valves.

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