73.0mm (1360cc) is +.094", 73.5mm (1380cc) is + .115", 74.0mm (1400cc) is +.135". Yes you can bore that far, if offset bored. But 74.0mm Mini pistons are bloody scarce now, not seen any for years.

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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.

& then 160thou oversize (74.7mm) makes 1426cc ,,, then add an 84mm stroker crank & you have 1485cc,,, or add an 86mm oversize crank & you end up with 1510(ish)

all the stroker cranks that are made from std large journal cranks can vary in stroke length from one grinder to another, some don`t quite end up with the "exactly" the above figures, you may end up with a 1410cc or a 1412 or a 1415 with 73mm bore & 84mm crank,,, you might end up with a 1483cc or a 1485 or a 1486 with a 74.7mm bore & 84mm stroke crank, & then you can get a 1508 or a 1510 or a 1512 depending on what crank you started with & also depending on how it was ground & trued after the whole process

but hey... who`s going to quivell about a couple of ccs here & there???

But still 74,7mm (160thou) oversize is about as far as anyone would want to go,,, there is actually room for more if you`re prepared to offset bore,,, then sleeve it,,, & then offset bore the sleeves to achieve an even bigger engine---> BUT i would highly recomend "NOT" doing so,,, unless you just want a talking piece for the pub counter meal or you`re rich as (or maybe just as stupid as me)

& if you have even more money than sense, you can order a 91mm stroke crank & make your engine even bigger again if you`re nutso, we have one here, in a mini & ready to fire up & hear it running if you`re keen

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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.

Hey Matt how's the worldwide search for more -.080" rod bearings going....

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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.

What is the availability of .060" like?

I still have 2 sets sitting here Kev, & i`m yet to build the spare 1510 donk, so i basically have one spare set ready for whenever i need them,,, but yeah i`d still like some more



.060s are starting to be harder to find now too

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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.

I either have to find a set of .060"s or find another crank.

didn't MiniMania have some small journal 080s?

I did get a set from them years ago when most people didn`t even believe they existed & just recently Kev enlightened me that they show them listed again but i`m yet to check it out

Ive recently bought a wiring loom for a stn wagon from them & there was a stuff up with the price , we paid what was asked but now we have been sent a bill for more,,, so i`ll sort that out before i make another order.

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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.

im glad this was asked im still getting a grasp on the whole stroker and broing process
but as rebuild mine ill get there i was possibly thinking about going to a 1330 or 1360 stroker
in terms of getting some thing good to drive with a bit of grunt and reliability would this be too much ?not enough lol?

another thing i was goin to ask is what cost would be involved in rewiring a mini

cheers bob

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1978 NUGGET GOLD 1275 LS

Err what bore do you have at the moment?

It is most common to bore to 1360 or 1380, and then stroke from there.
Which in both cases gets you over the 1400cc mark.

Plenty of torque.

You'll need new pistons (to suit the bore), small journal conrods, crank stroke work, etc etc.

Depends what you really want from the motor.

currently its a stock 1275 well as far as i know

i guess ill have to check that

well at mdu i got 40.8 hp so thats about average for a stock 1275 ls

cheers bob

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1978 NUGGET GOLD 1275 LS