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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Offset ET28 hole in ET25 for more valve lift
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<blockquote data-quote="johnmead" data-source="post: 52687" data-attributes="member: 776"><p>I stopped by the local Ford garage and one of the mechanics gave me a roller rocker from a 2000 2.4 4-cylinder engine. I then stopped by the local Harley dealer and got a lifter from a "Iron Head" Sportster. It is from the 60s and that is when the HC VIncent roller cams were made.</p><p></p><p>The Sportster is a pushrod type automobile solid lifter. The roller has a Torrington needle bearing that rides on a spindle similar to the Vincent rocker pin. The rollers/bearing/pins are available as a set. </p><p></p><p>I then stopped at my machinist and he said that it would be easy to make up a cam lifter like the VIncent with a captive design for the roller like the Ford rocker. I am going to give another call to the guy in Colorado and ask again if he will sell me the stuff he has on the HC Vincent roller cams.</p><p></p><p>One more stop before heading home was at the engine shop that I use. They do a lot of NASCAR stuff (I live in NASCAR country). One of the guys in the shop does a lot of motorcycle and sportscar stuff and said that offset rockers should not cause any problems as they will not be radical as VIncent rockers are 1:1. Besides the higher lift I will also get a few degrees of longer durations. He said that the spring pressures are relatively low compared to race engines so wear should not be a problem. </p><p></p><p>He also mentioned DLC (diamond like coating) for the cams and gave me the name of the shop near Charlotte North Carolina (the capital of NASCAR country) that is only 40 miles from where my mother and sister live. Since I am retired I am going to run down there next week with the MK5 cams and lifters and get their opinion.</p><p></p><p>Thanks again guys for the help. I will let you know what I find out.</p></blockquote><p></p>
[QUOTE="johnmead, post: 52687, member: 776"] I stopped by the local Ford garage and one of the mechanics gave me a roller rocker from a 2000 2.4 4-cylinder engine. I then stopped by the local Harley dealer and got a lifter from a "Iron Head" Sportster. It is from the 60s and that is when the HC VIncent roller cams were made. The Sportster is a pushrod type automobile solid lifter. The roller has a Torrington needle bearing that rides on a spindle similar to the Vincent rocker pin. The rollers/bearing/pins are available as a set. I then stopped at my machinist and he said that it would be easy to make up a cam lifter like the VIncent with a captive design for the roller like the Ford rocker. I am going to give another call to the guy in Colorado and ask again if he will sell me the stuff he has on the HC Vincent roller cams. One more stop before heading home was at the engine shop that I use. They do a lot of NASCAR stuff (I live in NASCAR country). One of the guys in the shop does a lot of motorcycle and sportscar stuff and said that offset rockers should not cause any problems as they will not be radical as VIncent rockers are 1:1. Besides the higher lift I will also get a few degrees of longer durations. He said that the spring pressures are relatively low compared to race engines so wear should not be a problem. He also mentioned DLC (diamond like coating) for the cams and gave me the name of the shop near Charlotte North Carolina (the capital of NASCAR country) that is only 40 miles from where my mother and sister live. Since I am retired I am going to run down there next week with the MK5 cams and lifters and get their opinion. Thanks again guys for the help. I will let you know what I find out. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Offset ET28 hole in ET25 for more valve lift
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