<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Ditch the 1.65 rockers no good for racing<div>Geoff Byrne</div><div>TR6 racer down under<br><br><div dir="ltr">Sent from my iPhone</div><div dir="ltr"><br><blockquote type="cite">On 11 Feb 2020, at 12:52 am, van.mulders.marcel--- via Fot <fot@autox.team.net> wrote:<br><br></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></div><hr id="zwchr" data-marker="__DIVIDER__"><div data-marker="__HEADERS__"><b>Van: </b>"fot" <fot@autox.team.net><br><b>Aan: </b>"fot" <fot@autox.team.net><br><b>Verzonden: </b>Maandag 10 februari 2020 02:34:27<br><b>Onderwerp: </b>[Fot] Camshaft recommendation<br></div><div><br></div><div data-marker="__QUOTED_TEXT__">
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><div>Thanks, Mike<br><br><br></div></div>
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