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PostPosted: Tue Aug 01, 2017 11:09 pm 
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848cc
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Joined: Fri Jun 12, 2015 11:45 am
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Location: Brisbane
Hi incredible wealth of knowledge

Do you know much about the Morris 1100S engine. It is the 1275 version with 9 studs on the cylinder head and remote gearboxes.

Or do you know anything about the standard Morris 1100 which had the 1098 engine.

Is it equivalent to something that ran in a mini? I couldn't find any valve sizes or bore stroke sizes, etc

Is it worth dropping it into a mini?

Google must not be searching properly coz the World Wide Web does not have the answer. Impossible.

Plug on




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PostPosted: Tue Aug 01, 2017 11:24 pm 
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1275cc
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Location: Wollongong, NSW
Do a search on ausmini using the search at the top of each page. There's plenty of info here on the 1100s powertrain
viewtopic.php?f=2&t=95556

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PostPosted: Wed Aug 02, 2017 8:06 am 
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848cc
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Joined: Fri Jun 12, 2015 11:45 am
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Location: Brisbane
Yes. I thought google would have picked up that thread but it didn't.

I read that thread last night and it's gold.

So engine wise, I can assume it's a non s 1275. So same as a 1275LS Clubman? So if I'd refresh internals, I could order stuff suited for a 1275LS?

Gearbox wise, it would be a 3 synchro with 4.22 or something like that.

Did you pull yours apart?


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PostPosted: Wed Aug 02, 2017 9:19 am 
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1275cc
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1275 engines all have the same bore, stroke etc. The non-S 1275 engines have the solid tappet covers on the back of the block. They all had different specs when new - compression ratio, diff ratio, heads, carbs, emissions gear etc. You can really rebuild them to a similar spec now, there won't be much of a difference between the blocks.

The 1100S engine had both small and large journals for the big ends. You'd need to measure the crank to find out whats in there now.

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PostPosted: Fri Aug 04, 2017 10:28 pm 
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Location: near Baulkham Hills, NSW
1100S engines up to about 12YD/Ta/H 10500 had a small rod journal crank with Cooper S rods.
Later ones had the bigger rod journal crank and heavy rods with lumps on the caps.
I prefer the early cranks, but you can stroke the big journal ones to get more cubes. Use with narrowed S rods.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank @7000+, 45 Dellorto, RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. Going harder with Stealth Black Box in.:mrgreen:

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PostPosted: Fri Aug 04, 2017 11:17 pm 
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848cc
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Joined: Fri Jun 12, 2015 11:45 am
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Location: Brisbane
Going to look at an engine on Sunday. The engine number seems to say it's a small journal.

Why the change from smaller to larger? And why would you prefer the smaller rod journal crank, apart from a longer stroke?




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PostPosted: Sat Aug 05, 2017 7:47 am 
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Stock they all had the same stroke.

The large journal one can be offset ground to get a stroker crank when using the small journal rods

The small journal ones were a higher quality crankshaft, the large journal one was cheaper to produce and used larger journals to recover the strength.

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PostPosted: Sat Aug 05, 2017 10:56 pm 
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Small journal crank 1100S motors used S rods, which are stronger material and a bit lighter then the lumpy big journal ones.
The small journal cranks have better counterweighting. Big journal ones are heavy, really should be wedged for a performance motor.

A+ rods are lighter still, but we never got any here. Except privately imported Rovers.

It's debatable whether the big journal cranks were any stronger, as they crack too in the same places,

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank @7000+, 45 Dellorto, RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. Going harder with Stealth Black Box in.:mrgreen:

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PostPosted: Tue Aug 08, 2017 1:21 pm 
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848cc
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Joined: Fri Jun 12, 2015 11:45 am
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Location: Brisbane
Interesting... I've just purchased a 1100S. Hoorah


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