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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial","sans-serif"">I trust the engine oil being used had the right concentration of</span><span style="font-size:11.0pt;font-family:"Arial","sans-serif"">
</span><span lang="EN" style="font-size:11.0pt;font-family:"Arial","sans-serif"">Zinc dialkyldithiophosphate</span><span style="font-size:11.0pt;font-family:"Arial","sans-serif"">? Proper concentrations should be 1500 to 1700 ppm. Current engine oils are
at about 500 – 600 ppm.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial","sans-serif""><a href="mailto:ed@wadsworthoneal.com">ed@wadsworthoneal.com</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial","sans-serif"">Edward J. O’Neal, P.E., Pte.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial","sans-serif"">Wadsworth O’Neal Associates, Inc.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial","sans-serif"">6418 Commerce Park Drive<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial","sans-serif"">Fort Myers, Florida 33966<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial","sans-serif"">phone: (239) 245-8728<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial","sans-serif"">cell: (239) 410-6174<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Healeys [mailto:healeys-bounces@autox.team.net]
<b>On Behalf Of </b>warthodson@aol.com<br>
<b>Sent:</b> Sunday, March 25, 2018 11:15 AM<br>
<b>To:</b> healeys@autox.team.net<br>
<b>Subject:</b> [Healeys] cam failure<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">A friend recently had a reground cam fail after a few years of normal use. The engine had been professionally rebuilt. There are several possible explanations,
however one unusual thing he discovered is that the wear on the lobes & tappets is only apparent on cylinders 4,5 & 6. The worst visible wear is on the exhaust valve lobe/tappet of Cyl 6. & the least wear is on the exhaust valve lobe/tappet of Cyl 4.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">Cyls 1,2 & 3 appear to be in very good condition. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">Does this suggest any specific cause for the failure? <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">He will be having the cam & tappets replaced & will be using a
<u>Piper Camshaft</u>, for an Austin Healey 3000, it is Part No. AH3BP270 (Fast Road) and is from a “billet” and not a regrind.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">Are the Piper Cams generally considered good quality?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">Any comments on this subject would be appreciated.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">Gary Hodson<o:p></o:p></span></p>
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