I am doing up an 1100. Whats the max overbore? and what will the capacity be after?.
I have a spare block so when the rings go I will just change it all over. Cant beat cubes right?

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100 thou over at the moment. Russell engineering are the only ones selling these in Australia.

Cheers
Aaron

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"How to Modify Your Mini", by David Vizard has an oversize chart in the blocks and crank section, page 87 to be precise. Also has combination of stroke and bore, so us lazy people don't have to work it out! Says you can fit Imp pistons (Hillman Imp I pressume) and if you go +.040 Imp pistons on a 1098 you can get 1251, that would be rather impressive but may be a bit too big, grab a copy of the book (if you don't already have it) and read up on this section.

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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

hey guys
What is the best version of Vizards book ?
I know I need one, but i have just been slogging away at the body at the moment. Probly looking a little to far forward. Cheers guys again

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the laws may be a little tighter, but we dont have roadworthys. If I can keep of the loud pedal around the cops and dont get defected and sent to regency(inspection place) I should be ok

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I have built a few of these motors over the years using Imp standard 68.0mm pistons (back when 1275s were rarer).
It's pretty easy to break into the main oilway from oil pump at back of block with these pistons, never mind +.040" ones..
If you wanna go this big these days, find a 1275...

Good Imp pistons suitable for a thrashing are bloody dear now, I got quoted A$800 for a set of UK ones a while back.
Imp parts in Australia have pretty well dried up. As my brother found out whilst restoring his Imp.

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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.

we plug & offset drill the oil gallery, 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.

So what do you do for pistons Matt- I heard you were playing with Suzuki? bike ones..??

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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.

yamaha pistons form early 80's bike ill find the bike but its a 750cc and has the same crown height and bore size is 68mm.
easy stuff as they are forged and will handle the revs and heat.
did a conversion years ago with a 998 motor and a set of these, it was quick and has never had any hassles in about 500 1/4 mile runs its has had.

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www.minicranks.com add me to your watch list and come back again soon, under construction.

im at 1220 with imp pistons, not saure how it will go, but myengine came complete but disasebled, i wouldnt have done it otherwise.
if you want imp stuf theres a place in NZ called impwerks, they have a website and are very helpfull.

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speed costs....how fast do you want to go...