Richard,
In talking to 3 different machine shops it appears that the
"standard" valve grind for car engines is the triple grind. As about the
only engines that have valve jobs any more are race engines, I think this is
the "standard" for race engines. Tractor and industrial engines I think
still use the traditional single angle grind.
The machinist I'm using now says he has 0.040, 0.060 and 0.080 width
valve seat cutters. I think they all use carbide valve seat cutters now and
they don't really "grind" the seats with stones anymore. Anyway, he says he
uses the 0.060 on the exhausts for more heat transfer surface and 0.040 on
the intake seats, for what it's worth.
My head is also cracked between those two water ports and so was our
first head. Must be pretty common.
Tim
-----Original Message-----
From: Richard Taylor [mailto:tarch@bellsouth.net]
Sent: Friday, May 11, 2012 8:19 AM
To: 'Greg Solow'; 'Tim Murphy'; 'Kas Kastner'
Cc: ryan.murphy@fdlco.wi.gov; fot@autox.team.net
Subject: RE: [Fot] TR4 Valve spring - pressure, assembled height, suppliers
Greg,
I am doing a valve & guide job on my TR-4 head. My cam is a Babe Erson
BFE-149 with intake of 430 and duration of 282. My normal shift point is
5000 rpms with a never exceed of 5500. Inasmuch as I drive my car to events,
reliability, not brute power, is the game plan.
May I ask your recommendations on valve guides (bronze vs. iron), their
clearances and spring pressures? What about multi-angle valve grinds?
Another issue. I found a conspicuous crack between the center 2 water
galleys between #2 & #3 pistons. It looks as if it's been there forever and
does no harm. Does that render my cylinder head toast?
Thanks,
Richard Taylor
TR-4 #196
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