Nick Jones Posted July 6, 2013 Share Posted July 6, 2013 Finally in the process of assembly the 2L bottom end for my Vitesse.I'm foxed by the pistons as they have no arrow on the top to show me which way to put them in. They are supposed to be AE Hepolite pistons and have been run before, but for very few miles and will be fitted with new rings.It may be that they have a central gudgeon pin and orientation does not matter, but I'm pretty sure every other Triumph engine I've built has had pistons with offset gudgeon pin......Anyone know? See pic of piston crown......ThanksNick Quote Link to comment Share on other sites More sharing options...
Richard B Posted July 6, 2013 Share Posted July 6, 2013 Nick between 12 O'clock and 1 O'clock is there a triangle on the piston? Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted July 6, 2013 Author Share Posted July 6, 2013 Nope. No triangles, no arrows on any of the pistons. All same appearance and weight but 2 have a different numbering (all +0.020 though)Nick Quote Link to comment Share on other sites More sharing options...
Anthony Posted July 6, 2013 Share Posted July 6, 2013 Nick, here's an idea.....Put all the pistons in a rowPut a single gudgeon pin through two pistons, so they're connectedDo this with all the pistons so you form a 'train' of pistonsPlace a straight edge along each length of the pistonsNow, take one of the pistons out of the 'train' and turn it aroundNow see I'd the straight edges still touch every piston, or if there's a gap due to the pins being offsetI'm sure there are far easier ways to do this, but I've been at work all day and my brain isn't working Quote Link to comment Share on other sites More sharing options...
Anthony Posted July 6, 2013 Share Posted July 6, 2013 I've got the head off my engine right nowI think the PO has fitted County pistons to the engineThe writing on my pistons is the 'right way up' when viewed from the distributor side of the engine Quote Link to comment Share on other sites More sharing options...
mikew Posted July 6, 2013 Share Posted July 6, 2013 Nick_Jones wrote:It may be that they have a central gudgeon pin and orientation does not matter, but I'm pretty sure every other Triumph engine I've built has had pistons with offset gudgeon pin......Nick Agreed.i'd always assumed the markings are to be "read from the front" so all aligned the same and with the marks readable from the left hand side of the engine - if that makes sense Quote Link to comment Share on other sites More sharing options...
GT6 M Posted July 7, 2013 Share Posted July 7, 2013 Numbers to the front.M Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted July 7, 2013 Author Share Posted July 7, 2013 I'm now told (by someone who's built alot of these engines) that the 2L pistons have no offset and can be fitted either way.Nick Quote Link to comment Share on other sites More sharing options...
Anthony Posted July 7, 2013 Share Posted July 7, 2013 NickHave a read of this before you do anything......(It's towards the bottom of the page)http://myweb.tiscali.co.uk/tlweb/gt6/repmod/mod_eng_rebuild_prep.html Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted July 7, 2013 Author Share Posted July 7, 2013 Anthony,Thanks - very useful link that and a good method of checking. I've got the engine temporarily assembled for deck height measurement now but will give that a go when it comes apart again just to be sure. My pistons are Hepolite so pins may actually be central.....Also useful info on the decking which will be the next task!CheersNick Quote Link to comment Share on other sites More sharing options...
Anthony Posted July 7, 2013 Share Posted July 7, 2013 No worries Nick Quote Link to comment Share on other sites More sharing options...
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