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Ditch the 1.65 rockers no good for racing
Geoff Byrne
TR6 racer down under
Sent from my iPhone
> On 11 Feb 2020, at 12:52 am, van.mulders.marcel--- via Fot <fot@autox.team=
.net> wrote:
>=20
> =EF=BB=BF
> I also once bought a Goodparts 1.65 rocker roller assembly for a TR6 engin=
e, but in the end I had to use a 1.55 roller rocker assembly, also from Good=
parts, 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 fin=
d valve springs to cope with the high valve lift. I bought a G5 camshaft fro=
m Schneider, they call it the 320-F grind (duration is 268=C2=B0 at 0.050",=
timing is 57-83 87-53 , installation figure is then 103=C2=B0 :is that t=
he same as the G5 grind?) with 0.340"/8.6mm cam lift and that makes for a v=
alve lift of 12.9mm with the 1.55 rocker arms. With 1.65 rockers , valve lif=
t would be 14.2mm and I could not find valve springs for that lift. The valv=
e springs I used are part no 281003-063.20 from Summit (Isky), 320lb/inch sp=
ring 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 prob=
lem 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 (105=
kgs at full lift) an that seems to be enough till 7500 rpm
> Racetorations have a race cam with 7.6mm cam lift, probably that would wor=
k with 1.65 rocker arms. I still have the 1.65 rocker assembly, it is new an=
d it could work with a road cam or any camshaft with a maximum of 8mm cam li=
ft.
> Marcel
>=20
> Van: "fot" <fot@autox.team.net>
> Aan: "fot" <fot@autox.team.net>
> Verzonden: Maandag 10 februari 2020 02:34:27
> Onderwerp: [Fot] Camshaft recommendation
>=20
> Hi all, I=E2=80=99m building a TR6 race engine and have a set of 1.65 rati=
o roller rockers from Goodparts. Any recommendations for a suitable camshaft=
? I will be putting in cam bearings.=20
>=20
> Thanks, Mike
>=20
>=20
>=20
> _______________________________________________
> fot@autox.team.net
>=20
> http://www.fot-racing.com
>=20
> Donate: http://www.team.net/donate.html
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> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/van.mulders.=
marcel@telenet.be
> _______________________________________________
> fot@autox.team.net
>=20
> http://www.fot-racing.com
>=20
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Ditch the 1.65 rockers no good for racing<d=
iv>Geoff Byrne</div><div>TR6 racer down under<br><br><div dir=3D"ltr">Sent f=
rom my iPhone</div><div dir=3D"ltr"><br><blockquote type=3D"cite">On 11 Feb 2=
020, at 12:52 am, van.mulders.marcel--- via Fot <fot@autox.team.net> w=
rote:<br><br></blockquote></div><blockquote type=3D"cite"><div dir=3D"ltr">=EF=
=BB=BF<div style=3D"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 difficu=
lt to find a race camshaft with a lobe lift that is low enough. With l=
obes of 8mm or higher, I could not find valve springs to cope with the high v=
alve lift. I bought a G5 camshaft from Schneider, they call it the 320=
-F grind (duration is 268=C2=B0 at 0.050", timing is 57-83 87-5=
3 , installation figure is then 103=C2=B0 :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 a=
nd I could not find valve springs for that lift. The valve springs I used ar=
e part no 281003-063.20 from Summit (Isky), 320lb/inch spring rate. They rec=
ommend 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 pr=
essure in closed position is lower of course, but still 34kgs (105kgs a=
t full lift) an that seems to be enough till 7500 rpm</div><div>Racetoration=
s have a race cam with 7.6mm cam lift, probably that would work with 1.65 ro=
cker arms. I still have the 1.65 rocker assembly, it is new and it could wor=
k with a road cam or any camshaft with a maximum of 8mm cam lift.</div><div>=
Marcel</div><div><br></div><hr id=3D"zwchr" data-marker=3D"__DIVIDER__"><div=
data-marker=3D"__HEADERS__"><b>Van: </b>"fot" <fot@autox.team.net><br=
><b>Aan: </b>"fot" <fot@autox.team.net><br><b>Verzonden: </b>Maandag 1=
0 februari 2020 02:34:27<br><b>Onderwerp: </b>[Fot] Camshaft recommendation<=
br></div><div><br></div><div data-marker=3D"__QUOTED_TEXT__">
Hi all, I=E2=80=99m building a TR6 race engine and have a set of 1.65 ratio r=
oller 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>
<br>_______________________________________________<br>fot@autox.team.net<br=
><br>http://www.fot-racing.com<br><br>Donate: http://www.team.net/donate.htm=
l<br>Archive: http://autox.team.net/archive http://www.team.net/pipermail/fo=
t<br>Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/van.mulde=
rs.marcel@telenet.be<br></div></div><span>__________________________________=
_____________</span><br><span>fot@autox.team.net</span><br><span></span><br>=
<span>http://www.fot-racing.com</span><br><span></span><br><span>Donate: htt=
p://www.team.net/donate.html</span><br><span>Archive: http://autox.team.net/=
archive http://www.team.net/pipermail/fot</span><br><span>Unsubscribe/Manage=
: http://autox.team.net/mailman/options/fot/gkbyrne@optushome.com.au</span><=
br><span></span><br><span></span><br></div></blockquote></div></body></html>=
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