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FJR Motorcycle Forums
Technical & Mechanical Problems
Valve Theory 101
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<blockquote data-quote="Pterodactyl" data-source="post: 1307305" data-attributes="member: 76805"><p>I was recently having a discussion about valves with a friend who is as equally ignorant of the finer points of valve operations as I am. I thought where better to get our confusion cleared up than on this forum.</p><p></p><p>The basic question concerns how a valve becomes burnt. I understand that it is caused when a valve fails to seat properly for any of a variety of reasons. It has to do with the ability of the valve, particularly an exhaust valve, to transfer heat to the valve seat. So far, so good… I think. But here is where the confusion begins. Using just valve adjustment as the potential cause of a valve becoming burnt, under which condition is it most likely to occur? When the valve adjustment is too tight as measured between the cam and bucket, meaning the valve opens further than intended; or, when the valve adjustment is too loose, meaning the valve opens less than intended? And, how much more likely is it for an exhaust valve to burn than it is for an intake valve to burn given both are equally out of adjustment?</p><p></p><p>I knew I should have taken shop in high school.</p></blockquote><p></p>
[QUOTE="Pterodactyl, post: 1307305, member: 76805"] I was recently having a discussion about valves with a friend who is as equally ignorant of the finer points of valve operations as I am. I thought where better to get our confusion cleared up than on this forum. The basic question concerns how a valve becomes burnt. I understand that it is caused when a valve fails to seat properly for any of a variety of reasons. It has to do with the ability of the valve, particularly an exhaust valve, to transfer heat to the valve seat. So far, so good… I think. But here is where the confusion begins. Using just valve adjustment as the potential cause of a valve becoming burnt, under which condition is it most likely to occur? When the valve adjustment is too tight as measured between the cam and bucket, meaning the valve opens further than intended; or, when the valve adjustment is too loose, meaning the valve opens less than intended? And, how much more likely is it for an exhaust valve to burn than it is for an intake valve to burn given both are equally out of adjustment? I knew I should have taken shop in high school. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Valve Theory 101
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