Jerry:
Read the copy carefully - They are claiming the stems are
chromed,
which eliminates the worries about wear on the stems. They are also
claiming
that the tips are hardened, which resolves the concerns about
mushrooming.
The copy gets a bit confusing at this point; The text says that
the heads are swirl polished, which helps flow a bit but the picture
shows
non-swirl polished valves.
If they are truly swirl polished, then they will flow better
than stock.
You can always chuck them up in the drill and stone them to add a 30
degree
back cut to help the flow even more.
The undercut heads (necked down stems) does help flow as well,
but increases
valve head temperature on the exhaust. I would suggest pocket porting as
an alternative
if you are truly worried about flow...
Just my $0.00002
Vance
------------------------------
Cogito Ergo Zoom
(I think, therefore I go fast)
TR6 Web page: http://home.comcast.net/~v.navarrette/
-----Original Message-----
From: owner-6pack@autox.team.net [mailto:owner-6pack@autox.team.net] On
Behalf Of Jerry C Shaw
Sent: Friday, December 03, 2004 6:21 AM
To: 6pack@autox.team.net
Subject: Interesting source for SS valves
Found this website for TR6 valves.
http://www.rpmrons.com/SIvalvesrep_tri.html
Advantages: Stellite tips, chrome steel stems, 21 4N SS heads
Disadvanage: Not undercut to improve flow
Some have said that one-piece forged 21 4N SS valves mushroom at tip,
and
absolutely require bronze valve guides because stems are not hardened
steel.
Anyone tried these?
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