I am waiting of GR to get his delivery of flat top pistons for the 1100. He's been having trouble with his overseas manufacturer/supplier - long story. Talking to him the other day about what size to go. The block is currently 0.010" over. GR is getting 100,80,60 and he can't remember if there are 40s in the order as well. He said "go as big as you can - they really like it "

SO do I go 0.100" or do I go for 0.080" and give me 'room to expand' if I have too?

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David L


My greatest fear in life is that when I die my wife will sell my Mini and tools for the price I told her I paid for them!

Go as big as you can, if any drama's happen down the track, a 1100 block is easily & cheaply replaced.

Doogie

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I won Hay once, here's the pic to prove it..


Hay, it's not about the car, it's not about the venue, it's about the people that come here. Peter Dwyer, Mayor of Hay NSW.

Can you safely take the block out to 0.100" over?

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David L


My greatest fear in life is that when I die my wife will sell my Mini and tools for the price I told her I paid for them!

Just go with what GR says

im at 1220 - 0.160" over if im not mistaken, id go to 0.100" small bore blocks are a dime a dozen an you can always go to imp pistons

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

Also I hear triumph 2000 pistons work too but I'm not sure maybe what I heard was maybe it was wrong but I do like the sound of it..

I go 100 over for sure. Listen and learn from Graham and you cannot go wrong!

good luck with it all

go the 100 thou David

& for 1360LS --->the triumph 2000(tall piston) & 2500(short piston) pistons are for use in a large bore (1275) to take them out 160thou oversize to make a 1426cc

go the 100thou David, do it!!!! you know you want 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.

And pick up a 30 dollar 998 block for the back of the shed for that peace of mind. Then you won't have that niggling little concern anymore.

It'll make a good coffee table base too!

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

how many blocks do you want Dave? I've got heaps of those anchors sitting around.

Mick - you are banned from talking for an hour(I know it is hard for a greenie!!)

Hooroo

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Rob Forsyth
Miniot!!

Ah drat! What'd i do?

Is it the coffee table base thing? It's useful AND a talking point at parties.

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

Sure is - wait until you START it...lol

Hooroo

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Rob Forsyth
Miniot!!

Thanks for all the relpys (I think ) I was looking for something a little more concrete. I'm not trying to second guess GR and I take his advise onboard. I'm trying to be an educated buyer . When I first started playing with cars a rebore and increase in piston size was considered major heart surgery and you took the smallest steps possible. Now I'm being advised to jump 4 sizes and 'go for broke' sort of and I would like to understand more of what I am going for, and am I leaving myself open to problems down the track

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David L


My greatest fear in life is that when I die my wife will sell my Mini and tools for the price I told her I paid for them!

well, there should be pleanty of meat left if you go 0.100" over, i assume you can offset bore also, somone else can discuss this one?
maby GR shuld get a run of +0.120's

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

GR told me he has actually built one with 120s....
I also used to run Imp pistons, they are 68.0mm. Need to offset bore the block for these, and often #4 bore hits the oilway from pump.... then need to either sleeve the hole or trash the block.
I agree, go +.100". 998 blocks are not exactly scarce....

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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.