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Machining specs for new muff, liner
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<blockquote data-quote="timetraveller" data-source="post: 13348" data-attributes="member: 456"><p>Muff to liner clearance 6 thou. Deck height 3" + 30 to 50 thou. That is not critical unless you are going to be using squish bands but see note 1) below. Piston to liner clearance 2.5 to 3 thou. Base of cylinder head to top of muff 2 to 3 thou.</p><p> </p><p>Note 1) When low clearance piston first became available several people had piston seizures and blamed the piston. Roy Robertson, and possibly others, found the problem. With a very low clearance it is important that the base of the muff is at 90 degrees to the axis of the liner. Many are not. Checking some of mine typically showed a run out of about 5 thou. The solution is to make two fittings, with accurate centers which are good fits into the top and bottom of the liner after it has been bored and honed. Putting the assembled muff and liner into a lathe with centers now allow the base of the muff to be checked and machined flat if it is not perpendicular to the bore. If the run out is fore and aft then it is not too important but if it across the engine then you do not need much error here to get rid of all of the 2 to 3 thou piston clearance.</p><p> </p><p>Note 2) My background is astronomy, not engineering, so wait for confirmation or correction of these figures from some of the Clubs experts before cutting metal.</p><p> </p><p>Good luck</p></blockquote><p></p>
[QUOTE="timetraveller, post: 13348, member: 456"] Muff to liner clearance 6 thou. Deck height 3" + 30 to 50 thou. That is not critical unless you are going to be using squish bands but see note 1) below. Piston to liner clearance 2.5 to 3 thou. Base of cylinder head to top of muff 2 to 3 thou. Note 1) When low clearance piston first became available several people had piston seizures and blamed the piston. Roy Robertson, and possibly others, found the problem. With a very low clearance it is important that the base of the muff is at 90 degrees to the axis of the liner. Many are not. Checking some of mine typically showed a run out of about 5 thou. The solution is to make two fittings, with accurate centers which are good fits into the top and bottom of the liner after it has been bored and honed. Putting the assembled muff and liner into a lathe with centers now allow the base of the muff to be checked and machined flat if it is not perpendicular to the bore. If the run out is fore and aft then it is not too important but if it across the engine then you do not need much error here to get rid of all of the 2 to 3 thou piston clearance. Note 2) My background is astronomy, not engineering, so wait for confirmation or correction of these figures from some of the Clubs experts before cutting metal. Good luck [/QUOTE]
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Machining specs for new muff, liner
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