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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Catastrophic camshaft and follower failure - any ideas?
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<blockquote data-quote="timetraveller" data-source="post: 5986" data-attributes="member: 456"><p>Hi Chaps. This is a very delayed reply to this thread as I have been away until three days ago. The following remarks are specific to a posting by Martinamotor on the 8th August where he states that loading on the valve gear is very high when turning over at low revs and recommends taking a handfull of throttle one started. I am not sure how to respond to this without seeming to be over rude but what a load of ****. For those of you with an interest in this please work out the 'maximum G' force on the valves etc at 6,000 rpm and at 1,000 rpm. If you cannot work it our then guess and after a few days I will tell you what the correct answer is. You are likely to be in for a surprise!</p><p> </p><p>Going back to the original problem of rapid cam and follower wear; assuming that nothing was binding then with any type of oil at all nothing should have worn like that in 4,000 miles. If the cams and followers were both of compatible material, ie both stellited or both case hardened or nitrided then it has got to be inadequate hardening. If the cams or followers will mark with a file then they are not hard enough and Maughans have a hardness tester if you can talk to them.</p><p> </p><p>Sorry if this seems a little harsh but I sometimes wonder where some of these ideas come from.</p><p> </p><p>Cheers</p></blockquote><p></p>
[QUOTE="timetraveller, post: 5986, member: 456"] Hi Chaps. This is a very delayed reply to this thread as I have been away until three days ago. The following remarks are specific to a posting by Martinamotor on the 8th August where he states that loading on the valve gear is very high when turning over at low revs and recommends taking a handfull of throttle one started. I am not sure how to respond to this without seeming to be over rude but what a load of ****. For those of you with an interest in this please work out the 'maximum G' force on the valves etc at 6,000 rpm and at 1,000 rpm. If you cannot work it our then guess and after a few days I will tell you what the correct answer is. You are likely to be in for a surprise! Going back to the original problem of rapid cam and follower wear; assuming that nothing was binding then with any type of oil at all nothing should have worn like that in 4,000 miles. If the cams and followers were both of compatible material, ie both stellited or both case hardened or nitrided then it has got to be inadequate hardening. If the cams or followers will mark with a file then they are not hard enough and Maughans have a hardness tester if you can talk to them. Sorry if this seems a little harsh but I sometimes wonder where some of these ideas come from. Cheers [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Catastrophic camshaft and follower failure - any ideas?
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