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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 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 f=
ind 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=C2=B0 at 0.05=
0", timing is 57-83 87-53 , 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 l=
ift would be 14.2mm and I could not find valve springs for that lift. The v=
alve springs I used are part no 281003-063.20 from Summit (Isky), 320lb/inc=
h 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=20
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 an=
d it could work with a road cam or any camshaft with a maximum of 8mm cam l=
ift.=20
Marcel=20
Van: "fot" <fot@autox.team.net>=20
Aan: "fot" <fot@autox.team.net>=20
Verzonden: Maandag 10 februari 2020 02:34:27=20
Onderwerp: [Fot] Camshaft recommendation=20
Hi all, I=E2=80=99m 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.=20
Thanks, Mike=20
_______________________________________________=20
fot@autox.team.net=20
http://www.fot-racing.com=20
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot=20
arcel@telenet.be=20
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<html><body><div style=3D"font-family: Verdana, Arial, Helvetica, sans-seri=
f; font-size: 10pt; color: #000000"><div>I also once bought a Goodparts 1.6=
5 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 eno=
ugh. With lobes of 8mm or higher, I could not find valve springs to cope wi=
th the high valve 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&nb=
sp; 87-53 , 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 val=
ve 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 valv=
e springs I used are part no 281003-063.20 from Summit (Isky), 320lb/inch s=
pring 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 m=
ore 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 t=
hat 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 maximu=
m of 8mm cam lift.</div><div>Marcel</div><div><br></div><hr id=3D"zwchr" da=
ta-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 10 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=
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>
<br>_______________________________________________<br>fot@autox.team.net<b=
r><br>http://www.fot-racing.com<br><br>Donate: http://www.team.net/donate.h=
tml<br>Archive: http://autox.team.net/archive http://www.team.net/pipermail=
/fot<br>Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/van.m=
ulders.marcel@telenet.be<br></div></div></body></html>
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_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
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