Hillclimb car, only need to live for <60 seconds, I wouldn't worry hahaha.

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1964 Morris 850, 1330 Supercharged - 81.8hp atws.
1975 Leyland Mini S 1100S powered - Nice and reliable.
1977 Leyland Mini LS - Project LS-T

Type R integra

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67 Deluxe under going full resto

VTEC yo

Yes as Vizard says 1596 is possible, with a custom made 91mm crank and 74.7 bore. Cost more than a jap transplant, and it won't rev either, with good power. He got more power with an 86mm stroke.
A 1596 might have torque though!
Cast iron hand grenade I reckon......

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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.

In the Leyland Super Mini series here years ago, a few guys were running 1600cc (probably 1596 as you say) with a billet crank.

I could be wrong, but I think Paul Gulson might have been one of the first?
KB

We have a 1600cc unit here with Arden crossflow cyl head & 6 speed dog engagement gearbox, with full race cam & 13.8:1 compression ratio etc etc etc-->super dooper gnarly thing really, sounds like a V8 sprint car (well ok, maybe not quite like a V8 sprint car but close)

My road mini engine is a nice tame smooth drivable 1510cc donk & lasted about 8-9 years of thrashing around the road & club races nearly every 2nd weekend & then a Targa Tasmania rally & then even more club events after that & am rebuilding (just rings & bearings) it again at the moment,

1426cc is easy enough, (74.7mm -->or 160thou oversize) just that offset bore needed & most commonly need to plug & re-drill offset the end oil galleries, easy done no problems

Add stroker crank of whatever offest you like & away you go

& there are 2 common pistons avaliable for that type of engine, (amongst others that are not so common but still quite avaliable if you look around) first is the one Kev/Dr mini suggested & that`s the short triumph 2.5 piston, (they`re the ones i used) which dictates the use of a very small cc cyl head chamber &/or shaving the block (either way it`s no drama) but you can also use the triumph 2000 piston which is the same bore size but quite tall & will need to knotch out the number 3 piston if using them in conjunction with a stroker crank just to clear the dizzy drive gear,(i don`t like doing that tho) so maybe do what i do & skim/slim/trim/thin down the dizzy drive gear---> easy-peasy

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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.

yeah, in my mini mods book there is a kit to make it goes to 1600.

this is with the machining and such

not much room between the cylinders lol

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I've got a 1415 in mine and i find it very reliable

it,s also torquey but could do with a bigger head just need to
save up some pennys first

I know someone who bought a mini with a 1380, soon after he got it, it did a head gasket, and then he found that the block hadn't been offset bored and the wall cracked between 2 & 3. So if you can, find out if it was offset bored

offset bored means like this (not as exaggerated)


O--O
--O--O

instead of like this

OOOO

offset boring means more meat remains between the cylinder walls

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did I tell you that I won a trophy?

what, like a V4?
KB

Actually Simon your 2nd one is correct. A 1275 from the factory has #2 and #3 a little closer together than the others, when correctly offset bored the spacing is then equal.
<edit> you can straight bore to 1360, and even 1380 (just)- the real reason for offset boring used to be so you could then go to 74.0mm (1400cc) when the 1380 wore out.. but 74mm Mini pistons are rocking horse now.

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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.

well there's something new I've learnt... I guess I made up the idea in my head that you'd move them apart across the block, not away from each other...

so like this:

O-O-O-O

instead of this:

O--OO--O



(KB, bugger off )

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did I tell you that I won a trophy?

Not quite, you move both 1 and 2 towards radiator, and 3 and 4 towards the flywheel. By the same amount.

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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.

O-O--O-O

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did I tell you that I won a trophy?

i thought you could go up to 120 thou oversize, i think thats what graham russel said onetime. No idea what cc that is but would be fun.