Hi Guys , just started putting my 1100 motor back together and have come across a few clearance issues. I have a 998 block which has been bored out +100 to except GR 1100 pistons , i am using a reground 1098 crank , the problem is the dissy drive is hitting the bottom of the piston skirts . I have heard that i may need to machine down the dissy drive but it seems that it would have to be awfully thin to clear the piston skirts . Does anyone know what the best way to fix this is , i would have thought someone has come across this before ?

Yes just machine the dizzy driveshaft down, quite safe, there is a pic in Vizard's book.
Wombat had this same problem with his build.

5/16" is the recommended shaft dia I think, I'll check in da Viz book.

[edit] No pic shown in book, but p438 in my book says machine dizzy drive shaft down to 5/16". Reduces wear on the dizzy bearings he says.

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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.

Just the middle section - leave the ends so that it sort of looks engine valves on each end

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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!

bah, set it up with crank fired ignition, throw the dizzy drive away completely

yeah, same thing with my 1510cc engine, needed to skim the dizzy-shaft down heaps,

no problem tho, 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.