TomBerlin Posted November 7, 2002 Share Posted November 7, 2002 Current pistons appear to be .060 over 1600. Does anyone know what the cylinders should measure? Are larger pistons available? Will +.090 pistons work in a 711 block? Link to comment Share on other sites More sharing options...
I.Mupferit Posted November 7, 2002 Share Posted November 7, 2002 .060 will give you approximately 1660 ccs whereas .090 will make it 1700 and yes you should be ok with a 711M block at that size. Can't remember the exact size of the bore but try asking Roger King, he will be able to tell you straightaway. Link to comment Share on other sites More sharing options...
Peter T Posted November 7, 2002 Share Posted November 7, 2002 83-83.5 is a safe bet for a thickwalled 711m block, any larger and your asking for trouble. If it did break through, you can allways liner the block, but this sometimes is not 100% reliable. C7 PWT X-Flow all Steel Link to comment Share on other sites More sharing options...
edmandsd Posted November 7, 2002 Share Posted November 7, 2002 + 90 gives 1690 (83.25) not 1700 (83.50) AX's blocks are safe to 85mm (1760) - I needed one liner when I went to 86.5mm (1825) on an AX. Wouldn't go over 83.5mm (1700cc) on standard block. All assumes standard 77.6mm stroke. Home of BDR700 Link to comment Share on other sites More sharing options...
cdg Posted November 7, 2002 Share Posted November 7, 2002 I once went to 85mm on a 711m in a hillclimb car revving to 8000-no problem at all, although I concede that not all blocks will go that far with absolute safety. Only changed to a +0.090 when the classes were standardised at 1700cc. It was a few years ago... Chris. Link to comment Share on other sites More sharing options...
I.Mupferit Posted November 7, 2002 Share Posted November 7, 2002 Dave, I was rounding it up, but yes I realise it is not a true 1700 Link to comment Share on other sites More sharing options...
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