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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
hard chrome liners
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<blockquote data-quote="Black Flash" data-source="post: 24096" data-attributes="member: 433"><p>the dimples were an old design thought by Porsche engineers to keep oil on the hardchrome liner wall. this was especially necessary on high power aircooled Porsche engines. with standard liners the wear on these engines was too much and the chromed liners worked very well indeed, whitout the dimples the engines seized alot.</p><p>My bored and stroked Bob Dunn engine has an nicasil plated alloy liner fitted, the heat transfer of that compared to an iron liner has increased tremendously. touching the barrel after only a few minutes of idling is a painfull experience. After many years of modifications Bob is totally convinced using thes liners for his highly tunes engines. the same applies to the standart breather.</p><p>if the engine is in good mechanical condition and the breather correctly timed there should be no issues. Bob recommends the slot being 0.375" wide. I have just machines a new sleeve yesterday keeping the outer diameter as thin as possible to enable as much room for air in the tubular compartment around that sleeve on a Comet engine. I am at the moment doing the wiring but have to go on holiday ( the better half story, you know that?) on saturday. so the next three weeks there will be no progress. If only we could have holidays at home.....</p><p>Bernd</p></blockquote><p></p>
[QUOTE="Black Flash, post: 24096, member: 433"] the dimples were an old design thought by Porsche engineers to keep oil on the hardchrome liner wall. this was especially necessary on high power aircooled Porsche engines. with standard liners the wear on these engines was too much and the chromed liners worked very well indeed, whitout the dimples the engines seized alot. My bored and stroked Bob Dunn engine has an nicasil plated alloy liner fitted, the heat transfer of that compared to an iron liner has increased tremendously. touching the barrel after only a few minutes of idling is a painfull experience. After many years of modifications Bob is totally convinced using thes liners for his highly tunes engines. the same applies to the standart breather. if the engine is in good mechanical condition and the breather correctly timed there should be no issues. Bob recommends the slot being 0.375" wide. I have just machines a new sleeve yesterday keeping the outer diameter as thin as possible to enable as much room for air in the tubular compartment around that sleeve on a Comet engine. I am at the moment doing the wiring but have to go on holiday ( the better half story, you know that?) on saturday. so the next three weeks there will be no progress. If only we could have holidays at home..... Bernd [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
hard chrome liners
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