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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Partial Single Seizure? Safe to ride?
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<blockquote data-quote="oexing" data-source="post: 99431" data-attributes="member: 1493"><p>I´d say 5 thou should be plenty of clearance for a 84mm simple piston type in a cast iron linered alu cylinder. That is what I´d go for when installing in an all cast iron cylinder with less heat growth compared to an alu cylinder. Judging from the picture I suspect a poorly honed bore, typical for Sunnen hones without the specified hone oil, very critical. Anyway, I don´t like the Sunnen types with two grinding stones plus two felt wipers, simply prone to chatter marks - and this is what I had with two E-Type pistons. Admittedly I specified way too little clearance, stupid then, but also got an engine block with out of round bores. You cannot measure this with a two point internal mike, only to find out with three point mikes - just. But I honed the block myself with a production hone from then former Zündapp works and could definitely feel the chatter marks in first minutes of hauling out another two or three thou. So since many years the 3.8 E-Type does great with 0.14-0.15mm clearance, old type pistons. </p><p></p><p> Vic</p><p>[ATTACH=full]23704[/ATTACH]</p><p></p><p></p><p>Ahmm, maybe I should not publish this photo - but it came out allright and the engine has run many tens of thousand kilometers ever since, engine in car and crank in there while hand honing :</p><p></p><p>[ATTACH=full]23708[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 99431, member: 1493"] I´d say 5 thou should be plenty of clearance for a 84mm simple piston type in a cast iron linered alu cylinder. That is what I´d go for when installing in an all cast iron cylinder with less heat growth compared to an alu cylinder. Judging from the picture I suspect a poorly honed bore, typical for Sunnen hones without the specified hone oil, very critical. Anyway, I don´t like the Sunnen types with two grinding stones plus two felt wipers, simply prone to chatter marks - and this is what I had with two E-Type pistons. Admittedly I specified way too little clearance, stupid then, but also got an engine block with out of round bores. You cannot measure this with a two point internal mike, only to find out with three point mikes - just. But I honed the block myself with a production hone from then former Zündapp works and could definitely feel the chatter marks in first minutes of hauling out another two or three thou. So since many years the 3.8 E-Type does great with 0.14-0.15mm clearance, old type pistons. Vic [ATTACH=full]23704[/ATTACH] Ahmm, maybe I should not publish this photo - but it came out allright and the engine has run many tens of thousand kilometers ever since, engine in car and crank in there while hand honing : [ATTACH=full]23708[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Partial Single Seizure? Safe to ride?
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