<div dir="ltr">+1 for John's numbers. I'm running Isky's TR-777 cam in my TR4 with the same specs John reported. I routinely spin my nitrided balanced stock crank and balanced/lightened shot peened stock rods to 6K with no valve issues. Don't have the cajones to spin it higher but it has never run out of breath.I should mention that I'm running BFE's oversize valves and checked seat pressures, installed height and coil bind very carefully.</div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Feb 14, 2017 at 8:34 PM, John Styduhar via Fot <span dir="ltr"><<a href="mailto:fot@autox.team.net" target="_blank">fot@autox.team.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-size:small">The specs for the Isky dual spring setup (TR05-TR06) and TR-777 cam I use in my TR3 racer are:</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">installed height 1.625"</div><div class="gmail_default" style="font-size:small">seat pressure 100#</div><div class="gmail_default" style="font-size:small">max coil bind height 1.060"</div><div class="gmail_default" style="font-size:small">spring rate #/inch 320</div><div class="gmail_default" style="font-size:small">TR777 cam lift .480" </div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">I don't think your seat pressure is too far out of line but you should check your installed height with the manufacturer's spec sheet as Scott suggested. You may be able to increase seat pressure by adding shims but make sure to check for coil binding at max lift. </div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default"><span style="font-size:10pt;font-weight:bold;font-family:verdana;color:black;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial"> </span></div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small"><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Feb 14, 2017 at 3:49 PM, MadMarx via Fot <span dir="ltr"><<a href="mailto:fot@autox.team.net" target="_blank">fot@autox.team.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="DE" link="#0563C1" vlink="#954F72"><div class="m_7792658739656214035m_-6585899988407148527WordSection1"><p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1f497d">These are very light springs.<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1f497d">I would run 250 seat pressure and 500 at full lift.<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1f497d">Cheers<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1f497d">Chris<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1f497d"><u></u> <u></u></span></p><div><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm 0cm 0cm"><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Von:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Fot [mailto:<a href="mailto:fot-bounces@autox.team.net" target="_blank">fot-bounces@autox.team<wbr>.net</a>] <b>Im Auftrag von </b>timmmurphh--- via Fot<br><b>Gesendet:</b> Dienstag, 14. Februar 2017 20:56<br><b>An:</b> <a href="mailto:fot@autox.team.net" target="_blank">fot@autox.team.net</a><br><b>Betreff:</b> [Fot] valve spring pressure on TR4 race engine<u></u><u></u></span></p></div></div><span><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><span lang="EN-US">I have 85 lbs. pressure on the intake valve with the valve closed and it sits at a height of 1.655 inches. At .400 lift, I have 190 lbs. of pressure. We only run to 6000 RPM with the gearing we have and the engine we have. The valve springs are double springs and the machine shop says they are all about the same, very consistent. What pressures would be recommended? The machine shop thinks these pressures are light for a 6000 RPM engine. Any advice will be appreciated. Thanks.<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p><p class="MsoNormal"><span lang="EN-US">Tim Murphy<u></u><u></u></span></p><p class="MsoNormal"><span lang="EN-US">1961 TR4 #317 BRG<u></u><u></u></span></p></span></div></div><br>______________________________<wbr>_________________<br>
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