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</o:shapelayout></xml><![endif]--></head><body lang=DE link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>My piston manufacturer says about braking in:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>Put the pistons in, and then drive the car to pole.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>Means: Reckless driving from the first second.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>Cheers<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>Chris<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b>Von:</b> Fot <fot-bounces@autox.team.net> <b>Im Auftrag von </b>van.mulders.marcel--- via Fot<br><b>Gesendet:</b> Sonntag, 26. August 2018 10:20<br><b>An:</b> fubog1 <fubog1@aol.com><br><b>Cc:</b> fot <fot@autox.team.net><br><b>Betreff:</b> Re: [Fot] TR4 Race Engine Break-in Questions<o:p></o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana",sans-serif;color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana",sans-serif;color:black'>Probably much more horsepower is lost by being too kind on a fresh engine than by running it at full throttle too soon;<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana",sans-serif;color:black'>Marcel<o:p></o:p></span></p></div><div class=MsoNormal align=center style='text-align:center'><span style='font-size:10.0pt;font-family:"Verdana",sans-serif;color:black'><hr size=2 width="100%" align=center id=zwchr></span></div><div><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Verdana",sans-serif;color:black'>Van: </span></b><span style='font-size:10.0pt;font-family:"Verdana",sans-serif;color:black'>"fot" <<a href="mailto:fot@autox.team.net">fot@autox.team.net</a>><br><b>Aan: </b><a href="mailto:paulricco@att.net">paulricco@att.net</a>, "fot" <<a href="mailto:fot@autox.team.net">fot@autox.team.net</a>><br><b>Verzonden: </b>Zaterdag 25 augustus 2018 23:33:25<br><b>Onderwerp: </b>Re: [Fot] TR4 Race Engine Break-in Questions<o:p></o:p></span></p></div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana",sans-serif;color:black'><o:p> </o:p></span></p><div><div><div id="AOLMsgPart_2_4bb9a068-a11d-4865-8961-c785ca51311c"><div><div id="yiv8453697846yui_3_16_0_ym19_1_1532862227910_4168"><div><p class=MsoNormal><a name="yui_3_16_0_ym19_1_1535222251184_2891"></a><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:black'>The short version, rings flex.<o:p></o:p></span></p></div></div><div id="yiv8453697846yui_3_16_0_ym19_1_1532862227910_4166"><div><p class=MsoNormal><a name="yiv8453697846yui_3_16_0_ym19_1_153286222"><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:black'>Piston pushes ring up, it's flat and against the lower face of the groove. Gas pressure charge travels through the side gap on top past the upper face of the ring and gets behind it right before TDC @ ignition point.<o:p></o:p></span></a></p></div><div><p class=MsoNormal><span style='mso-bookmark:yiv8453697846yui_3_16_0_ym19_1_153286222'><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:black'>At that point the ring flexes and seals the top and lower faces of the ring against the groove faces, and the charge is trapped behind the ring; this is for pressure retention & max ring expansion. When the piston starts to go down, the ring flexes back flat against the upper groove face and loses the charge behind it and relaxes a bit.<o:p></o:p></span></span></p></div><div><p class=MsoNormal><span style='mso-bookmark:yiv8453697846yui_3_16_0_ym19_1_153286222'><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:black'>Repeat this every combustion stroke.<o:p></o:p></span></span></p></div></div><div id="yiv8453697846yui_3_16_0_ym19_1_1532862227910_4559"><div><p class=MsoNormal><span style='mso-bookmark:yiv8453697846yui_3_16_0_ym19_1_153286222'><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:black'>The above is with power on.<o:p></o:p></span></span></p></div></div><div id="yiv8453697846yui_3_16_0_ym19_1_1532862227910_4300"><div><p class=MsoNormal><span style='mso-bookmark:yiv8453697846yui_3_16_0_ym19_1_153286222'><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:black'>On closed throttle (decell), there's a vacuum on top of the piston so there is not a pressure charge to fully expand the ring, so it doesn't flex the same.<o:p></o:p></span></span></p></div></div><div id="yiv8453697846yui_3_16_0_ym19_1_1532862227910_4400"><div><p class=MsoNormal><span style='mso-bookmark:yiv8453697846yui_3_16_0_ym19_1_153286222'><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:black'>This flexing of the ring will give it a very very slightly ) face as a result, it's not perfectly flat.<o:p></o:p></span></span></p></div></div><div id="yiv8453697846yui_3_16_0_ym19_1_1532862227910_4560"><div><p class=MsoNormal><span style='mso-bookmark:yiv8453697846yui_3_16_0_ym19_1_153286222'><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:black'>So ring seating isn't just to to get the initial "burnishing" of ring/cylinder wall, it also establishes the profile of the ring face for the best seal under both full open and full closed throttle.<o:p></o:p></span></span></p></div><div><p class=MsoNormal><span style='mso-bookmark:yiv8453697846yui_3_16_0_ym19_1_153286222'><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:black'>It's all in the ring FLEX!<o:p></o:p></span></span></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='mso-bookmark:yiv8453697846yui_3_16_0_ym19_1_153286222'><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:black'>This is also why ring side clearance is so critical, I scrap more pistons for this being out of spec than for any other reason, especially if the engine was running rich.<o:p></o:p></span></span></p></div></div><div id="yiv8453697846yui_3_16_0_ym19_1_1532862227910_4699"><div><p class=MsoNormal><span style='mso-bookmark:yiv8453697846yui_3_16_0_ym19_1_153286222'><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:black'>My break-in routine is-<o:p></o:p></span></span></p></div></div><div id="yiv8453697846yui_3_16_0_ym19_1_1532862227910_4733"><div><p class=MsoNormal><span style='mso-bookmark:yiv8453697846yui_3_16_0_ym19_1_153286222'><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:black'>Initial start, run to temp, 1 maybe 2 heat cycles, retorque & check all.<o:p></o:p></span></span></p></div><div><p class=MsoNormal><span style='mso-bookmark:yiv8453697846yui_3_16_0_ym19_1_153286222'><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:black'>(If new cam, 15-20 minute @ 2k rpm)<o:p></o:p></span></span></p></div><div><p class=MsoNormal><span style='mso-bookmark:yiv8453697846yui_3_16_0_ym19_1_153286222'><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:black'>No excessive running beyond cam break-in and basic tuning with no load!<o:p></o:p></span></span></p></div></div><div id="yiv8453697846yui_3_16_0_ym19_1_1532862227910_4886"><div><p class=MsoNormal><span style='mso-bookmark:yiv8453697846yui_3_16_0_ym19_1_153286222'><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:black'>On track, 2-3 warm-up laps @ part throttle, vary RPM 4-5k, use some engine braking.<o:p></o:p></span></span></p></div></div><div id="yiv8453697846yui_3_16_0_ym19_1_1532862227910_5031"><div><p class=MsoNormal><span style='mso-bookmark:yiv8453697846yui_3_16_0_ym19_1_153286222'><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:black'>2-3 more laps with more throttle and engine braking, same rpm.<o:p></o:p></span></span></p></div></div><span style='mso-bookmark:yiv8453697846yui_3_16_0_ym19_1_153286222'></span><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:black'>2-3 more laps using full throttle, maybe 85-90% revs, and intentional repeated HEAVY engine braking from WOT in top gear.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:black'>After that I usually do a retorque and follow-up; next time out should be good to go. <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:black'>This open/closed throttle running subjects the rings to the loads that it will have under normal operation.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:black'>HTH<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:black'>Glen<o:p></o:p></span></p></div></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>-----Original Message-----<br>From: Paul Ricco via Fot <<a href="mailto:fot@autox.team.net">fot@autox.team.net</a>><br>To: Friends of Triumph <<a href="mailto:fot@autox.team.net">fot@autox.team.net</a>><br>Sent: Sat, Aug 25, 2018 1:30 pm<br>Subject: [Fot] TR4 Race Engine Break-in Questions<br><br>FOT, Good afternoon and we hope everyone is having a great weekend. We have a couple questions for those who have had experience and success building TR4 race engines. The information might be helpful others on the forum as well. 1. We have seen a few different recommendations for initial run-in. They seem to range from 5 minutes to 20 minutes at approximately 2000 RPM’s. How long and how many RPM’s are people running them for? 2. How long are people leaving the break-in oil in the motor? a. Are people taking out the break in oil right after the run-in and replacing it with regular oil before leaving for the track? b. Are people running a few sessions under load at the track with it in and then switching? c. Something else? If so, what are you having success with? Again, we are really gearing the questions towards race engines due to complication of breaking in the race motors at the track with limited time and the track session schedules. We are trying to avoid re-starting the entire referendum up on oil brands again, so we apologize if we do. We are really trying to get to how people are breaking-in the TR4 motors successfully. Thank you for considering my questions, Paul Ricco _______________________________________________ <a href="mailto:fot@autox.team.net" target="_blank">fot@autox.team.net</a> <a href="http://www.fot-racing.com" target="_blank">http://www.fot-racing.com</a> Donate: <a href="http://www.team.net/donate.html" target="_blank">http://www.team.net/donate.html</a> Archive: <a href="http://www.team.net/pipermail/fot" target="_blank">http://www.team.net/pipermail/fot</a> Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/fot/fubog1@aol.com" target="_blank">http://autox.team.net/mailman/options/fot/fubog1@aol.com</a> <o:p></o:p></span></p></div></div></div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana",sans-serif;color:black'><br>_______________________________________________<br><a href="mailto:fot@autox.team.net">fot@autox.team.net</a><br><br><a href="http://www.fot-racing.com">http://www.fot-racing.com</a><br><br>Donate: <a href="http://www.team.net/donate.html">http://www.team.net/donate.html</a><br>Archive: <a href="http://www.team.net/pipermail/fot">http://www.team.net/pipermail/fot</a><br>Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/fot/van.mulders.marcel@telenet.be">http://autox.team.net/mailman/options/fot/van.mulders.marcel@telenet.be</a><o:p></o:p></span></p></div></div></div></body></html>