<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=utf-8"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
p.li1, li.li1, div.li1
{mso-style-name:li1;
mso-margin-top-alt:auto;
margin-right:0in;
mso-margin-bottom-alt:auto;
margin-left:0in;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
span.s1
{mso-style-name:s1;}
.MsoChpDefault
{mso-style-type:export-only;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
/* List Definitions */
@list l0
{mso-list-id:1600602367;
mso-list-template-ids:-1;}
ol
{margin-bottom:0in;}
ul
{margin-bottom:0in;}
--></style></head><body lang=EN-US link=blue vlink="#954F72" style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal>If you can barrow a leak down tester that is still the best tool to assess engine health. I also change oil filters after each race and cut it open to see what is trapped inside. A well built TR race motor can easily do double those hours on the bottom end. In my opinion the key to long tern motor health, assuming a good build, is a high quality race oil. My choice is Joe Gibbs Driven XP-3 10-30, I have bearings that look almost new at 50 hrs. using this oil. No such thing as “cheap” racing oil. “Never be beaten by parts” K. Kastner.</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Ken</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Sent from <a href="https://go.microsoft.com/fwlink/?LinkId=550986">Mail</a> for Windows</p><p class=MsoNormal><o:p> </o:p></p><div style='mso-element:para-border-div;border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal style='border:none;padding:0in'><b>From: </b><a href="mailto:fot@autox.team.net">James Trudeau via Fot</a><br><b>Sent: </b>Saturday, October 28, 2023 2:06 PM<br><b>To: </b><a href="mailto:fot@autox.team.net">fot@autox.team.net</a><br><b>Subject: </b>[Fot] Race Engine Refreshing Frequency - compression results</p></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I finished a 9 weekend race/school/track day season that started in April and finished at Thompson in October with no obvious performance problems. Total of 38 engine hours including warmup, grid, race, cool down. <o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Did a dry compression test today:<o:p></o:p></p></div><div><ol style='margin-top:0in;-webkit-text-size-adjust: auto' start=1 type=1><li class=li1 style='margin-top:0in;margin-bottom:0in;mso-list:l0 level1 lfo1;font-stretch: normal'><span class=s1>210</span><o:p></o:p></li><li class=li1 style='margin-top:0in;margin-bottom:0in;mso-list:l0 level1 lfo1;font-stretch: normal'><span class=s1>225</span><o:p></o:p></li><li class=li1 style='margin-top:0in;margin-bottom:0in;mso-list:l0 level1 lfo1;font-stretch: normal'><span class=s1>195</span><o:p></o:p></li><li class=li1 style='margin-top:0in;margin-bottom:0in;mso-list:l0 level1 lfo1;font-stretch: normal'><span class=s1>200</span><o:p></o:p></li></ol><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I get some oil blow by at the valve cover cap and maybe some drips from lower end seals (not sure if oil starts at valve cover). <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I’m sure I’ll hear a suggestion to do a leak down test and / or wet compression. <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Oil filter forensics?<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>In the absence of obvious issues, how much of a tear down is warranted? <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'>Jim<o:p></o:p></p></div></div><p class=MsoNormal>Sent from my iPhone<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>