Clay Head Posted March 4, 2002 Share Posted March 4, 2002 Having removed my 1800 X/F it has some bore wear and will need to go to 86mm. Its built on an original Ford AX block so should go. Can I get 86mm pistons and if so where is best? Thanks.........Tim Link to comment Share on other sites More sharing options...
edmandsd Posted March 4, 2002 Share Posted March 4, 2002 Accralite forged pistons come in the following sizes and are available exclusively from Burton's. The cc is based on a standard stroke - 77.62mm 83.5mm = 1700cc 85mm = 1760cc 86.5mm = 1825cc Roger King used to do some 85.9mm accralites for 1800cc exactly - Some time ago now though. Link to comment Share on other sites More sharing options...
oilyhands Posted March 4, 2002 Share Posted March 4, 2002 If you are desparate Omega and JE pistons will make pistons to your pattern and dimensions, it helps if the existing pattern is similar to one they already make.. Oilynads Link to comment Share on other sites More sharing options...
Roger King Posted March 4, 2002 Share Posted March 4, 2002 This is precious close to advertising, but since the direct question has been asked, we have 85.9mm pistons on the shelf. Link to comment Share on other sites More sharing options...
J.R. Posted March 4, 2002 Share Posted March 4, 2002 I have a virtually unused set of 85.6mm (I am fairly sure) forged pistons. Have been keeping them by for several years but probably wont be needing them now. Any good to you? if you reply be patient as I cant get to the computer much this week. Link to comment Share on other sites More sharing options...
Clay Head Posted March 7, 2002 Author Share Posted March 7, 2002 Thanks all for the replies. the bore where will not allow less than 86mm and it looks as though I can get them via Burton's as their catalogue is wrong. the 86.5mm are actually 86mm! So I should be fine. Link to comment Share on other sites More sharing options...
cdg Posted March 8, 2002 Share Posted March 8, 2002 Tim, If you can find a set of longer rods (about 133mm) you can use a set of flat tops from a 16V Vauxhall, and run them down the bore to effectively make a combustion chamber.A lot of high revving racing x-flows use this method. These are beautiful forged Mahle affairs, and are very light. Small end would need narrowing very slightly, but pin size is the same. Available in excellent used condition for about £50 a set. I admit this is not as straightforward as buying a set from Burton! Chris. Chris. Link to comment Share on other sites More sharing options...
edmandsd Posted March 8, 2002 Share Posted March 8, 2002 I was advised that flat top pistons are only really any good with a chambered head or vice versa - 'Squish' aint good otherwise - apparently. Link to comment Share on other sites More sharing options...
Clay Head Posted March 8, 2002 Author Share Posted March 8, 2002 Chris thanks for the advice- I have already been to Dave Brooks with that idea as I can get a set of Vauxhall pistons from a friend. He tends to think that running them as you suggest is not good news for longer term reliability (rings, etc). It looks like Dave can get me some pistons made in the States for almost the same price as the accrolite pistons but without the wait. They will be to his exact design and should work well. Tim Link to comment Share on other sites More sharing options...
cdg Posted March 8, 2002 Share Posted March 8, 2002 Dave, My Connaught built engine uses a flat head/flat top piston arrangement and is very effective. It's true that squish is non existent, but because of the way in which the inlet ports aim the charge at the bore wall, swirl is created within the bore to aid rapid combustion. If the inlet flow was straight (something like a Fiat Twin Cam) I admit that this method wouldn't work as well as the normal Heron type chamber. Peter Burgess has done exhaustive tests on the flowbench regarding x-flow inlet port shapes, even to the extent of inserting straight tubes directly into the valve throat area, but nothing worked as well as the originally designed port shape. Tim, Glad Dave Brooks has come up trumps! Did he show you those beautiful lightened rods that he does? Chris. Link to comment Share on other sites More sharing options...
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