Are the large journal 1275cc cranks all the same? Such as those that are found in some of the Morris 1100s 1275 engines? Or is this a mini specific large journal crank we're speaking of?

dewey

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dwightgunning.com

All the same, if you are talking Oz A series. An LS1275 or 1275 Moke crank is just an 1100S later type one.

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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.

ah Doc,,,you got me there,,,i`d actually forgotten about that little beauty,,,but you gotta admit,,,they`re very few & far between ey???

dewey,,,most of the large journals are "effectively" the same,,,they do differ slightly here & there but basically if it`s a large journal 1275cc crank then it`s interchangeable with another large journal 1275cc crank no problemo,,,(slight differences can be found with materials & rolled fillets on the later english cranks,,,but still interchangeable with our 1100s/1275 large journals

& Hey There Jim...good to hear from you again mate,,,we will have to have another Qld/NSW MDC meet again ey??? & don`t swap your crank for an 1100 one mate,,,they`re the wobbly-est of em all i reckon.

cross drilling is meant to help an oil feed issue/situation,,,i`m not such a big fan of it as it reduces the strength of the crank...if it cracks, guess where it will crack from/to/first etc

& Nitriding is one type of hardening process,,,tuftriding is another, there are lots but they`re probly the most common for crank shafts

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

thanks for answering my questions matt

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Inconspicuously Conspicuous
Appreciation without Depreciation
forever chasing clearer skies...

I've been meaning to go to one of these much spoken of MDC events for ages. Good ol' Gazza Hind invited me along to a few last year but I could never make it

dewey

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dwightgunning.com

gazza hind i kavent seen him around the boards 4 ages

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Cheers

ok here is a teaser 1275 block but displacement of 1220 or some where round the i know what it come out of but i wanna see if anyone else knows of them mate has one he actully detuned the motor was a bit on the wild side if ya know what i mean
makka

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Anonymous moderation means the agro that is built up towards the mods isn't aimed at an individual (fewer "Makk" attacks). Less stress for mods means less moderator "retirements".

Maybe a 1071S, bored out??

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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.

yeah if you bore out the 1275 block and then stick a 1071 crank in youll end up with a smaller capacity but a stronger and higher reving engine specially if you put a turbo on then you have a turbo 1220 or 1160ish that revs to 10000 rpm or above

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Cheers

Matt,
OK I'll ask the question. What is the difference between the Sth African 1071 crank and non Sth African 1071 cranks?

Regards
RonR

nope was a standard motor built for one production vehicle
makka

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Anonymous moderation means the agro that is built up towards the mods isn't aimed at an individual (fewer "Makk" attacks). Less stress for mods means less moderator "retirements".

sorry to sound a bit dumb, but to spell
it out for me my 1100s and 1275ls have
good cranks, ya??

makka.. and it had 10x10 inch tyres too?

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Pretty sure the Seth Effrikan one was a big pin crank. 1.75" big ends.. the usual 1071S was 1.625".

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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.

no i think it had 13 inch wheels

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Anonymous moderation means the agro that is built up towards the mods isn't aimed at an individual (fewer "Makk" attacks). Less stress for mods means less moderator "retirements".