This is a multi-part message in MIME format.
--===============3081928833405639972==
boundary="------------010902030004080102050307"
This is a multi-part message in MIME format.
--------------010902030004080102050307
Content-Transfer-Encoding: 7bit
My understanding is that the most important issue with flat-tappet
engines and lubrication is that
the initial break-in is crucial to longevity. For the first 1500-2000
miles of operation it is extremely
important that the proper level of zinc additive (i.e. zddp) beprovided
so that cam surfaces, rings
and cylinder bores be allowed to seat themselves. Newer oils are too
slick to allow the necessary
scuffing to take place, whereas the presence of zddp provides enough
friction for the seating to
take place. Once past the initial break-in, zddp is no longer as
necessary. I have not seen a definitive
statement as to whether zddp is necessary after break-in but many
sources recommend that an
oil with higher levels of zddp be used.
I found the discussion at
http://www.hotrod.com/how-to/engine/ccrp-0702-break-in-new-cam/
to be helpful. Note that, at the end of the article, there are some
recommendations for oils with
higher levels of zddp, usually used in diesel engines.
Cheers,
Tod Brown
B382002384LRXFE
TAC #864
--------------010902030004080102050307
Content-Transfer-Encoding: 7bit
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<font face="Arial">My understanding is that the most important issue
with flat-tappet engines and lubrication is that<br>
<font face="Arial">the initial br<font face="Arial">e<font
face="Arial">ak-in is crucial to longevity. For the
first</font></font></font>
1500-2000 miles <font face="Arial">of operation it is extremely <br>
<font face="Arial">important that the proper level of zinc
additive (i.e. zddp) be<font face="Arial"> <font face="Arial">provided
so that cam surfaces<font face="Arial">, rings<br>
<font face="Arial">and cylinder bores be allowed to seat
themselves. Newer oils are too slick to allow the
necessary<br>
<font face="Arial">scuffing to take place, whereas the
presence of zddp provides enough friction for the
seating to <br>
<font face="Arial">take place. Once past the initial
break-in, zddp is no longer as necessary. I have
not seen a definitive<br>
<font face="Arial">statement as to whether zddp is
necessary after break-in but many sources
recommend that an<br>
<font face="Arial">oil with higher levels of
zddp be used. <br>
<br>
<font face="Arial">I found the discussion at <a
href="http://www.hotrod.com/how-to/engine/ccrp-0702-break-in-new-cam/";><a
class="moz-txt-link-freetext"
href="http://www.hotrod.com/how-to/engine/ccrp-0702-break-in-new-cam/";>http://www.hotrod.com/how-to/engine/ccrp-0702-break-in-new-cam/</a></a><br>
<font face="Arial">to be helpful. Note that<font
face="Arial">, at the end of the
article, there are some recommendations
for oils with<br>
<font face="Arial">higher levels of
zddp, usually used in diesel engines.
<br>
<br>
<font face="Arial">Cheers,<br>
<br>
<font face="Arial">Tod Brown<br>
<font face="Arial">B382002384LRXFE<br>
<font face="Arial">TAC #864</font><br>
</font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font>
</body>
</html>
--------------010902030004080102050307--
--===============3081928833405639972==
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
_______________________________________________
tigers@autox.team.net
Archive: http://www.team.net/archive
Unsubscribe: http://autox.team.net/mailman/options/tigers/mharc@autox.team.net
--===============3081928833405639972==--
|