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Thanks everyone! Good stuff. I’m sticking to a redline of just over 6K. I’d also like to keep the 1.65 setup rather than invest in a 1.55 so keep the intel and suggestions coming. The GP3 is a definite contender. <div><br></div><div>Mike <br><br><br><br><p class="yahoo-quoted-begin" style="font-size: 15px; color: #715FFA; padding-top: 15px; margin-top: 0">On Monday, February 10, 2020, 4:07 PM, Geoff Byrne <gkbyrne@optusnet.com.au> wrote:</p><blockquote class="iosymail"><div id="yiv0747455949"><div>Ditch the 1.65 rockers no good for racing<div>Geoff Byrne</div><div>TR6 racer down under<br clear="none"><br clear="none"><div dir="ltr">Sent from my iPhone</div><div dir="ltr"><br clear="none"><blockquote type="cite">On 11 Feb 2020, at 12:52 am, van.mulders.marcel--- via Fot <fot@autox.team.net> wrote:<br clear="none"><br clear="none"></blockquote></div><blockquote type="cite"><div dir="ltr"><div style="font-family:Verdana, Arial, Helvetica, sans-serif;font-size:10pt;color:#000000;"><div>I also once bought a Goodparts 1.65 rocker roller assembly for a TR6 engine, but in the end I had to use a 1.55 roller rocker assembly, also from Goodparts, because, with the 1.65, it is difficult to find a race camshaft with a lobe lift that is low enough. With lobes of 8mm or higher, I could not find valve springs to cope with the high valve lift. I bought a G5 camshaft from Schneider, they call it the 320-F grind (duration is 268° at 0.050", timing is 57-83 87-53 , installation figure is then 103° :is that the same as the G5 grind?) with 0.340"/8.6mm cam lift and that makes for a valve lift of 12.9mm with the 1.55 rocker arms. With 1.65 rockers , valve lift would be 14.2mm and I could not find valve springs for that lift. The valve springs I used are part no 281003-063.20 from Summit (Isky), 320lb/inch spring rate. They recommend 0.45"/11.43mm (1.250" - 0.800"from closed to full open position, so it is about 1.4mm more in my engine, but there is no problem concerning coil binding : the installed height is a 1mm more than 1.250 , the pressure in closed position is lower of course, but still 34kgs (105kgs at full lift) an that seems to be enough till 7500 rpm</div><div>Racetorations have a race cam with 7.6mm cam lift, probably that would work with 1.65 rocker arms. I still have the 1.65 rocker assembly, it is new and it could work with a road cam or any camshaft with a maximum of 8mm cam lift.</div><div>Marcel</div><div><br clear="none"></div><hr id="yiv0747455949zwchr"><div><b>Van: </b>"fot" <fot@autox.team.net><br clear="none"><b>Aan: </b>"fot" <fot@autox.team.net><br clear="none"><b>Verzonden: </b>Maandag 10 februari 2020 02:34:27<br clear="none"><b>Onderwerp: </b>[Fot] Camshaft recommendation<br clear="none"></div><div><br clear="none"></div><div>
Hi all, I’m building a TR6 race engine and have a set of 1.65 ratio roller rockers from Goodparts. Any recommendations for a suitable camshaft? I will be putting in cam bearings. <div><br clear="none"><div>Thanks, Mike<br clear="none"><br clear="none"><br clear="none"></div></div>
<br clear="none">_______________________________________________<br clear="none">fot@autox.team.net<br clear="none"><br clear="none">http://www.fot-racing.com<br clear="none"><br clear="none">Donate: http://www.team.net/donate.html<br clear="none">Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot<br clear="none">Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/van.mulders.marcel@telenet.be<div class="yiv0747455949yqt5723059911" id="yiv0747455949yqtfd51209"><br clear="none"></div></div></div><div class="yiv0747455949yqt5723059911" id="yiv0747455949yqtfd38997"><span>_______________________________________________</span><br clear="none"><span>fot@autox.team.net</span><br clear="none"><span></span><br clear="none"><span>http://www.fot-racing.com</span><br clear="none"><span></span><br clear="none"><span>Donate: http://www.team.net/donate.html</span><br clear="none"><span>Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot</span></div><br clear="none"><span>Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/gkbyrne@optushome.com.au</span><div class="yiv0747455949yqt5723059911" id="yiv0747455949yqtfd70749"><br clear="none"><span></span><br clear="none"><span></span><br clear="none"></div></div></blockquote></div></div></div><blockquote></blockquote></blockquote></div>
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