Hi guys,
Does anyone know if a Morris 1100s motor will fit in a mini?
Zulu

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Zulu...

1967 mini Cooper S

Yes..with a few minor changes including a change of diff...

Cheers, Ian

trim the front engine plate { front engine mount in morrie 1100} check the diff ratio, std 1100 is 4.2ish {I think} the gearbox extension housing is different to a mini one, slightly longer and has a sandwich plate { not a tasty treat} between box and shift housing. stick a mini radiator and shroud on it and welcome to the big bore club.

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120bhp with 450kg just fun waiting to happen

We were prob. drunk when we set it up last and thought this will be a good idea

silly question this... but how much do you need to trim off?

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Zulu...

1967 mini Cooper S

Cut the mount brackets off, or trim it to Mini shape. Use oxy or angle grinder.
It's just for clearance.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

If you keep the 1100S diff housing make sure you get the remote gear change linkage too from the 1100 as it bolts to the diff housing differently to a Mini one due to the rubber sandwich plate. I have this in my van and it works fine.

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Slide
1965 Mini Van (1360)
1970 Mk2 Cooper S (1310)
1978 Rover SD1 V8 (4.6)
1996 Land Rover Discovery V8 (4.0)

Re the rubber sandwich plate, you can burn the rubber out and weld a steel strip in between to make it solid. Like Mini remote feel then.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Such great info Dr Mini.
What would the benefits be of the 1100 S motor over a mini 1275?

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Zulu...

1967 mini Cooper S

Morris 1100S motor is much the same as any other non S 1275.
But note the gearbox is only 3 synchro, and parts are getting scarcer for these.
Most people put the 1100S onto a Mini K remote box, or a rodchange one. Both are 4 synchro.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

there is no difference, therefore no other benefit. They're cheap and easier to get cos there were a lot more of them made.... If you can buy one, buy it...

I've had an 1100S motor in my cars since 1995 - I say cars because I've moved the same motor from car to car, and I say the same motor because it's the same crank, but I think I've had 4 different blocks

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did I tell you that I won a trophy?

No sideplates in an 1100S. One less place to leak!

Also, are they only a 9 stud head not 11 stud?

well, yeah, but only S motors had an 11 stud head standard, 1275LS, Californian Mokes, Rovers etc. had 9 stud heads

but that doesn't matter one little bit, and it can easily be changed with a drill...

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did I tell you that I won a trophy?

I'm thinking it will go on a mini K with the manual rod changer box.

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Zulu...

1967 mini Cooper S

I have an 1100S on a 22G1128 (4 synchro) box.
I changed the original 4.13:1 diff for a 2.95:1 and it is now an amazing highway cruising machine, but still has reasonable acceleration.

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Find a job you love and you will never have to go to work !

I love it Phil. Thanks!

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Zulu...

1967 mini Cooper S