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when i last flowed our race head, we got steady increases up to 0.550"
lift.
its easy enough to spot face the spring base on the head to use longer
springs
Terry
On Mon, Feb 10, 2020 at 11:52 PM van.mulders.marcel--- via Fot <
fot@autox.team.net> wrote:
> 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 highe=
r,
> 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 26=
8=C2=B0
> at 0.050", 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 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 lowe=
r
> of course, but still 34kgs (105kgs at full lift) an that seems to be enou=
gh
> till 7500 rpm
> 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 8=
mm
> cam lift.
> Marcel
>
> ------------------------------
> *Van: *"fot" <fot@autox.team.net>
> *Aan: *"fot" <fot@autox.team.net>
> *Verzonden: *Maandag 10 februari 2020 02:34:27
> *Onderwerp: *[Fot] Camshaft recommendation
>
> Hi all, I=E2=80=99m building a TR6 race engine and have a set of 1.65 rat=
io roller
> rockers from Goodparts. Any recommendations for a suitable camshaft? I wi=
ll
> be putting in cam bearings.
>
> Thanks, Mike
>
>
>
> _______________________________________________
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>
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<div dir=3D"ltr">when i last flowed our race head, we got steady increases =
up to 0.550" lift.=C2=A0<div><br></div><div>its easy enough to spot fa=
ce the spring base on the head to use longer springs<br><div><br></div><div=
>Terry<br clear=3D"all"><div><div dir=3D"ltr" class=3D"gmail_signature" dat=
a-smartmail=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><div=
><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=
=3D"ltr"><div><br></div></div></div></div></div></div></div></div></div></d=
iv></div></div></div></div><br></div></div></div><br><div class=3D"gmail_qu=
ote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Feb 10, 2020 at 11:52 PM=
van.mulders.marcel--- via Fot <<a href=3D"mailto:fot@autox.team.net";>fo=
t@autox.team.net</a>> wrote:<br></div><blockquote class=3D"gmail_quote" =
style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);pa=
dding-left:1ex"><div><div style=3D"font-family:Verdana,Arial,Helvetica,sans=
-serif;font-size:10pt;color:rgb(0,0,0)"><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=C2=A0 lobe lift that is low=
enough. With lobes of 8mm or higher, I could not find valve springs to cop=
e with the high valve lift. I bought a G5 camshaft from Schneider, they cal=
l it=C2=A0 the 320-F grind (duration is 268=C2=B0 at 0.050", timing is=
57-83=C2=A0 =C2=A0 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 f=
or a=C2=A0 valve lift of 12.9mm with the 1.55 rocker arms. With 1.65 rocker=
s , 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=C2=A0 (1.250&qu=
ot; - 0.800"from closed to full open position, so it is about 1.4mm mo=
re in my engine, but there is no problem concerning=C2=A0 coil binding : th=
e installed height is a 1mm more than 1.250 , the pressure in closed positi=
on is lower=C2=A0 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 wi=
th 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=3D"gmail-m_-9082697910296379686zwchr"><div><b>Van: </b>&qu=
ot;fot" <<a href=3D"mailto:fot@autox.team.net"; target=3D"_blank">fo=
t@autox.team.net</a>><br><b>Aan: </b>"fot" <<a href=3D"mail=
to:fot@autox.team.net" target=3D"_blank">fot@autox.team.net</a>><br><b>V=
erzonden: </b>Maandag 10 februari 2020 02:34:27<br><b>Onderwerp: </b>[Fot] =
Camshaft recommendation<br></div><div><br></div><div>
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.=C2=A0<div><br><div>Thanks, Mike<br><br=
><br></div></div>
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</blockquote></div>
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