Re: [Healeys] Let's talk oil some more..

[warthodson@aol.com]

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Dave,
Sorry, I was not very clear. I intended to draw a distinction between synthetic 
& "natural" oils vs. oils of any type with & without adequate ZDDP.  To say it 
another way,
Regardless of the type of oil (synthetic or natural) it is the lack of adequate 
ZDDP that may have contributed to the failure of the tappet/cam. So, it is not 
synthetic oil that is the cause of the failure.

Some additional  possible causes of the failure, in no particular order & by no 
means a complete list: 
Lack of proper assembly lubrication on the cam & tappet
In adequate initial cam/tappett break in.
re-using old tappets &/or cam (Not applicable in your case because you stated 
new tappets & cam were installed)
defective new tappets - personal experience - I had a rebuilt TR3 engine 
tappet/cam fail. My engine rebuilder blamed the new tappets because they did 
not have any crown on their mating surface. I do not know if that was the 
actual cause but we purchased new ones with a crowned surface & a new cam & did 
not have the problem reoccur.
Improper inadequate hardening of the tappet/cam surfaces.
Using incorrect oil viscosity for the application.
 
Gary Hodson
 
From: David Porter <frogeye@porterscustom.com>
Subject: Re: [Healeys] Let's talk oil some more..


 Gary, 
  Curious how you arrived at that conclusion ("least likely") given all the 
recent warnings due to reformulation of so many oils... 
  
  
On 8/4/2015 7:34 AM,   warthodson@aol.com wrote:  
  
  
      
Of all the possible causes for a tappet/cam failure the use of synthetic oil 
seems like the least likely explanation.   
    
Gary Hodson   
    
    
    


 
 


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<font color='black' size='2' face='arial'>
<div>Dave,</div>

<div>Sorry, I was not very clear. I intended to draw a distinction between 
synthetic &amp; "natural" oils&nbsp;vs.&nbsp;oils of any type&nbsp;with &amp; 
without adequate ZDDP.&nbsp;&nbsp;To say it another way,</div>

<div>Regardless of the type of oil (synthetic or natural) it is the lack of 
adequate ZDDP that may have contributed to the failure of the tappet/cam. So, 
it is not synthetic oil that is the cause of the failure.</div>

<div>&nbsp;</div>

<div>Some additional&nbsp; possible causes of the failure, in no particular 
order &amp; by no means a complete list: </div>

<div>Lack of proper assembly lubrication on the&nbsp;cam &amp; tappet</div>

<div>In adequate initial cam/tappett break in.</div>

<div>re-using old tappets &amp;/or cam (Not applicable in your case because you 
stated new tappets &amp; cam were installed)</div>

<div>defective new tappets - personal experience - I had a rebuilt TR3 engine 
tappet/cam fail. My engine rebuilder blamed the new tappets&nbsp;because they 
did not have any crown on their mating surface. I do not know if that was the 
actual cause but we purchased new ones with a crowned surface &amp; a new cam 
&amp; did not have the problem reoccur.</div>

<div>Improper inadequate hardening of the tappet/cam surfaces.</div>

<div>Using incorrect oil viscosity for the application.</div>

<div>&nbsp;</div>

<div>Gary Hodson</div>

<div>&nbsp;</div>

<div style="color: black; font-family: arial,helvetica; font-size: 10pt;">From: 
David Porter &lt;frogeye@porterscustom.com&gt;<br>
Subject: Re: [Healeys] Let's talk oil some more..<br>
<br>




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<div class="aolReplacedBody" text="#000000" bgcolor="#FFFFFF">
 Gary,
 <br>
 &nbsp;Curious how you arrived at that conclusion ("least likely") given all 
the recent warnings due to reformulation of so many oils...
 <br>
 
 <br>
 
 
<div class="moz-cite-prefix">
On 8/4/2015 7:34 AM, 
  <a class="moz-txt-link-abbreviated" href="mailto:warthodson@aol.com"; 
target="_blank">warthodson@aol.com</a> wrote:
  <br>
 
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<div>
Of all the possible causes for a tappet/cam failure the use of synthetic oil 
seems like the least likely explanation.
   </div>
 
   
<div>
Gary Hodson
   </div>
 
   
<div>
&nbsp;
   </div>
 
   
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<div style="color: black; font-family: arial,helvetica; font-size: 
10pt;">&nbsp;</div>
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