<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Haven’t figured out the problem yet, but I thought this explanation from Longacre on how a leakdown gauge works might interest you all.<div class=""><br class=""></div><div class="">"<span style="font-family: Calibri, sans-serif; font-size: 14.666666984558105px;" class="">The leak down gauge is simply a 100 psi gauge that reads backwards from a tire pressure gauge. Basically if you have 100 psi going to your cylinder and it doesn’t leak down at all then it will show you 0 leak down and/or 100 psi if it was a normal pressure gauge. If your regulator is set higher then 100 then the leakdown gauge will go below zero because its showing a higher pressure."</span></div><div class=""><div><br class=""></div><div>So, one of my gauges is no longer reading correctly, as I’m getting a higher pressure on the cylinder than on the supply, on some cylinders. Have to swap them out to figure out which, and then I’ll be able to determine how much leakdown there really is. </div><div><br class=""></div><div>More to follow this weekend!</div><div><div class=""><br class=""></div><div class="">On May 22, 2019, at 7:05 AM, John Styduhar <<a href="mailto:johnstydo@gmail.com" class="">johnstydo@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class="gmail_default" style="font-size:small">If you have an accusump, check if the valve is operating properly. Maybe the valve was closed accidentally during running and the engine oil level was excessive. </div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, May 22, 2019 at 6:54 AM Robert Lang via Fot <<a href="mailto:fot@autox.team.net" class="">fot@autox.team.net</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class=""><div class="gmail-m_8974874906473699492ydp2edd5880yahoo-style-wrap" style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:13px"><div class=""></div>
<div class="">Hi,</div><div class=""><br class=""></div><div class="">First off - I'd only to the leakdown test with the engine hot. Cold numbers don't really count. The numbers that you give look pretty good from a leakdown perspective. As a point of reference, with >10% leakdown into the sump in a couple of cylinders, you will see oil drip out of the strangest places (like around the nuts holding the valve cover down and the filler cap to which you refer.) So, either your gauge is lying or you need to verify your numbers with the engine at operating temps (and see if the numbers change). If you have access to another gauge, that might help figure out if anything is wrong. Oh, and is there any oil fouling on the plugs? Blow by should also introduce some oil into the cylinders when you lift off...<br class=""></div><div class=""><br class=""></div><div class="">I think Marcel's suggestion has merit.</div><div class=""><br class=""></div><div class="">Let us know if you find anything.</div><div class=""><br class=""></div><div class="">Regards,</div><div class="">Bob Lang<br class=""></div><div class=""><br class=""></div>
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On Wednesday, May 22, 2019, 4:14:19 AM EDT, van.mulders.marcel--- via Fot <<a href="mailto:fot@autox.team.net" target="_blank" class="">fot@autox.team.net</a>> wrote:
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<div class=""><div id="gmail-m_8974874906473699492yiv8845066306" class=""><div class=""><div style="font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 10pt;" class=""><div class="">If the catch can has a connection to a (low) spot of the crankcase, lots of oil can be pushed into the catch can at the track curves, especially when the duct between the crankcase and the can has only a small diameter, then the oil cannot return to the crankcase. It means there is some blow by, but maybe the symptoms are not necessarily bad news.</div><div class="">Marcel</div><div class=""><br clear="none" class=""></div><hr id="gmail-m_8974874906473699492yiv8845066306zwchr" class=""><div class="gmail-m_8974874906473699492yiv8845066306yqt7826991802" id="gmail-m_8974874906473699492yiv8845066306yqtfd94441"><div class=""><b class="">Van: </b>"fot" <<a href="mailto:fot@autox.team.net" target="_blank" class="">fot@autox.team.net</a>><br clear="none" class=""><b class="">Aan: </b>"fot" <<a href="mailto:fot@autox.team.net" target="_blank" class="">fot@autox.team.net</a>><br clear="none" class=""><b class="">Verzonden: </b>Woensdag 22 mei 2019 04:31:47<br clear="none" class=""><b class="">Onderwerp: </b>[Fot] Oil Blow-by Cause?<br clear="none" class=""></div><br clear="none" class=""></div><div class=""><div class="gmail-m_8974874906473699492yiv8845066306yqt7826991802" id="gmail-m_8974874906473699492yiv8845066306yqtfd88235">I just had a great weekend at Summit Point, perfect weather, four days and lots of track time, some quick laps and good racing. <div class="gmail-m_8974874906473699492yiv8845066306">After my last session, I noticed some dripping oil as I put the car in the trailer.</div><div class="gmail-m_8974874906473699492yiv8845066306">Got it home to find a half full catch can (1 pint?), and evidence of oil blowing out of the valve cover cap vent hole.</div><div class="gmail-m_8974874906473699492yiv8845066306">Tonight I ran a compression test and leakdown test. Cold engine results:</div><div class="gmail-m_8974874906473699492yiv8845066306"><br class="gmail-m_8974874906473699492yiv8845066306" clear="none"></div><div class="gmail-m_8974874906473699492yiv8845066306">1 - 200 and 2%</div><div class="gmail-m_8974874906473699492yiv8845066306">2- 180 and 6%</div><div class="gmail-m_8974874906473699492yiv8845066306">3 - 180 and 9%</div><div class="gmail-m_8974874906473699492yiv8845066306">4 - 195 and 0%</div><div class="gmail-m_8974874906473699492yiv8845066306">5 - 190 and 0%</div><div class="gmail-m_8974874906473699492yiv8845066306">6 - 185 and 0%</div><div class="gmail-m_8974874906473699492yiv8845066306"><br class="gmail-m_8974874906473699492yiv8845066306" clear="none"></div><div class="gmail-m_8974874906473699492yiv8845066306">Note - I suspect my longacre leakdown gauge may not be reading quite right, as when i have the air side set to 100, the leakdown % on the last three is slightly below zero. So, perhaps the leakdown on the first three is higher. </div><div class="gmail-m_8974874906473699492yiv8845066306">There was no excess oil until the last session. Oil pressure is about 50 hot at idle and 65 - 75 at speed, depending on RPM.</div><div class="gmail-m_8974874906473699492yiv8845066306">EGT readings remained in the 1200 - 1250 range across three monitored cylinders at top speed</div><div class="gmail-m_8974874906473699492yiv8845066306">What do i have - failing rings? </div><div class="gmail-m_8974874906473699492yiv8845066306">Any diagnosis or tests you recommend before I start pulling the thing apart would be appreciated.</div><div class="gmail-m_8974874906473699492yiv8845066306"><br class="gmail-m_8974874906473699492yiv8845066306" clear="none"></div><div class="gmail-m_8974874906473699492yiv8845066306">Triumphs racing - I’m sure I’m missing a few but this is who I remember.</div><div class="gmail-m_8974874906473699492yiv8845066306">TR3 - John Hasty, Henry Frye, John Styduhar</div><div class="gmail-m_8974874906473699492yiv8845066306">GT6 - me, Paul King, Jason Sukey, Jay De Pol until his diff case broke</div><div class="gmail-m_8974874906473699492yiv8845066306">Spitfire - Russ Moore, Marty Sukey, Jeff Govert, Kent Bain, others </div><div class="gmail-m_8974874906473699492yiv8845066306">Tr4 - Mark Wheatley, Allen Goode, I’m missing at least another one</div><div class="gmail-m_8974874906473699492yiv8845066306"><br class="gmail-m_8974874906473699492yiv8845066306" clear="none"></div><div class="gmail-m_8974874906473699492yiv8845066306">Scott Janzen</div><div class="gmail-m_8974874906473699492yiv8845066306"><br class="gmail-m_8974874906473699492yiv8845066306" clear="none"></div><br clear="none" class="">_______________________________________________<br clear="none" class=""><a href="mailto:fot@autox.team.net" target="_blank" class="">fot@autox.team.net</a><br clear="none" class=""><br clear="none" class=""><a href="http://www.fot-racing.com/" target="_blank" class="">http://www.fot-racing.com</a><br clear="none" class=""><br clear="none" class="">Donate: <a href="http://www.team.net/donate.html" target="_blank" class="">http://www.team.net/donate.html</a><br clear="none" class="">Archive: <a href="http://autox.team.net/archive" target="_blank" class="">http://autox.team.net/archive</a> <a href="http://www.team.net/pipermail/fot" target="_blank" class="">http://www.team.net/pipermail/fot</a></div><br clear="none" class="">Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/fot/van.mulders.marcel@telenet.be" target="_blank" class="">http://autox.team.net/mailman/options/fot/van.mulders.marcel@telenet.be</a><div class="gmail-m_8974874906473699492yiv8845066306yqt7826991802" id="gmail-m_8974874906473699492yiv8845066306yqtfd22369"><br clear="none" class=""></div></div></div></div></div><div class="gmail-m_8974874906473699492yqt7826991802" id="gmail-m_8974874906473699492yqtfd31970">_______________________________________________<br clear="none" class=""><a shape="rect" href="mailto:fot@autox.team.net" target="_blank" class="">fot@autox.team.net</a><br clear="none" class=""><br clear="none" class=""><a shape="rect" href="http://www.fot-racing.com/" target="_blank" class="">http://www.fot-racing.com</a><br clear="none" class=""><br clear="none" class="">Donate: <a shape="rect" href="http://www.team.net/donate.html" target="_blank" class="">http://www.team.net/donate.html</a><br clear="none" class="">Archive: <a shape="rect" href="http://autox.team.net/archive" target="_blank" class="">http://autox.team.net/archive </a><a shape="rect" href="http://www.team.net/pipermail/fot" target="_blank" class="">http://www.team.net/pipermail/fot</a><br clear="none" class="">Unsubscribe/Manage: <a shape="rect" href="http://autox.team.net/mailman/options/fot/robertlangtr6@yahoo.com" target="_blank" class="">http://autox.team.net/mailman/options/fot/robertlangtr6@yahoo.com</a><br clear="none" class=""><br clear="none" class=""><br clear="none" class=""></div></div>
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