[Fot] Camshaft recommendation

[Enquiries Road & Track]

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 at 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 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
> 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.
> Marcel
>
> ------------------------------
> *Van: *"fot" <fot at autox.team.net>
> *Aan: *"fot" <fot at autox.team.net>
> *Verzonden: *Maandag 10 februari 2020 02:34:27
> *Onderwerp: *[Fot] Camshaft recommendation
>
> 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.
>
> Thanks, Mike
>
>
>
> _______________________________________________
> fot at autox.team.net
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/fot/van.mulders.marcel@telenet.be
> _______________________________________________
> fot at autox.team.net
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
> Unsubscribe/Manage <http://www.team.net/pipermail/fotUnsubscribe/Manage>:
> http://autox.team.net/mailman/options/fot/enquiries@roadandtrack.net.au
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/fot/attachments/20200211/841bc40c/attachment-0003.htm>