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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Valve Timing
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<blockquote data-quote="Monkeypants" data-source="post: 55870" data-attributes="member: 2708"><p>which from my reading has a centre line measurement of 97 degrees. 97 degrees being tighter than 105 means a wider overlaps than with the 105, same profile. In car and truck engines, hot car cams are down around 100 to 105 degree lobe separation truck and RV low end torque cams are around 120 lobe separation. </p><p>It all gets rather confusing, especially when all of the profile variations are added in. For example, while Terry has used a wider lobe separation ( 105) than Irvings 97 degree Lightning cams, Terry's MK 5 profiles are very tall and wide giving about 170 degrees of overlap, so a much "hotter" cam than the mk 2. </p><p>A friend asked Mr. Robinson what the 105 of his 105 cams referred to and the answer coming back was " I think it is the difference between the opening of this and th closing of that"</p></blockquote><p></p>
[QUOTE="Monkeypants, post: 55870, member: 2708"] which from my reading has a centre line measurement of 97 degrees. 97 degrees being tighter than 105 means a wider overlaps than with the 105, same profile. In car and truck engines, hot car cams are down around 100 to 105 degree lobe separation truck and RV low end torque cams are around 120 lobe separation. It all gets rather confusing, especially when all of the profile variations are added in. For example, while Terry has used a wider lobe separation ( 105) than Irvings 97 degree Lightning cams, Terry's MK 5 profiles are very tall and wide giving about 170 degrees of overlap, so a much "hotter" cam than the mk 2. A friend asked Mr. Robinson what the 105 of his 105 cams referred to and the answer coming back was " I think it is the difference between the opening of this and th closing of that" [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin Valve Timing
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