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<div dir="ltr" data-setdir="false">Every engine will have a different service life, depending on state of development, tune, rpm range, general maintenance, etc.</div><div dir="ltr" data-setdir="false">A competitive full-tilt National spec engine will likely get a freshen-up every weekend, a mild-tune/low rev Vintage engine can last seasons w/regular maintenance.</div><div dir="ltr" data-setdir="false">Leakdown, oil filter inspection, valve lash check, oil pressure & temp readings, & plug check will give an idea of the engines health.</div><div dir="ltr" data-setdir="false">Next step is a bearing check; anything beyond that involves full teardown & hands-on inspection.</div><div dir="ltr" data-setdir="false">Also set valve lash prior to compression test, & realize that the compression test is of limited value; a leaking cylinder can still pump up pretty good...</div><div dir="ltr" data-setdir="false">HTH</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Glen Efinger<br></div><div dir="ltr" data-setdir="false">.<br></div><div><br></div>
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On Saturday, October 28, 2023 at 05:02:44 PM EDT, James Trudeau via Fot <fot@autox.team.net> wrote:
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<div><div id="ydp1782500ayiv2186919804"><div>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. <div><br></div><div>Did a dry compression test today:</div><div><ol class="ydp1782500ayiv2186919804ol1"><li style="margin:0px;font-stretch:normal;line-height:normal;" class="ydp1782500ayiv2186919804li1"><span class="ydp1782500ayiv2186919804s1">210</span></li><li style="margin:0px;font-stretch:normal;line-height:normal;" class="ydp1782500ayiv2186919804li1"><span class="ydp1782500ayiv2186919804s1">225</span></li><li style="margin:0px;font-stretch:normal;line-height:normal;" class="ydp1782500ayiv2186919804li1"><span class="ydp1782500ayiv2186919804s1">195</span></li><li style="margin:0px;font-stretch:normal;line-height:normal;" class="ydp1782500ayiv2186919804li1"><span class="ydp1782500ayiv2186919804s1">200</span></li></ol><div><br></div><div>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). </div><div><br></div><div>I’m sure I’ll hear a suggestion to do a leak down test and / or wet compression. </div><div><br></div><div>Oil filter forensics?</div><div><br></div><div>In the absence of obvious issues, how much of a tear down is warranted? </div><div><br></div><div>Jim<br><br><div dir="ltr">Sent from my iPhone</div></div></div></div></div>_______________________________________________<br><a href="mailto:fot@autox.team.net" rel="nofollow" target="_blank">fot@autox.team.net</a><br><br><a href="http://www.fot-racing.com" rel="nofollow" target="_blank">http://www.fot-racing.com</a><br><br>Donate: <a href="http://www.team.net/donate.html" rel="nofollow" target="_blank">http://www.team.net/donate.html</a><br>Archive: <a href="http://autox.team.net/archive" rel="nofollow" target="_blank">http://autox.team.net/archive</a> <a href="http://www.team.net/pipermail/fot" rel="nofollow" target="_blank">http://www.team.net/pipermail/fot</a><br>Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/fot/fubog1@aol.com" rel="nofollow" target="_blank">http://autox.team.net/mailman/options/fot/fubog1@aol.com</a><br><br><br></div>
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