Holy smokes, I have seen both failure modes and totally agree with the
analysis. I invested in one of Greg Solow's heavily modified units several
years back, but this goes several major steps beyond even that. Uncle Jack must
be very proud of you guys!
Gary Schneider
________________________________
From: Tony Drews <tony@tonydrews.com>
To: fot@autox.team.net
Sent: Tue, January 19, 2010 11:32:54 AM
Subject: [Fot] Uprated Oil Pump, TR-3/4
I was talking with a group of my Triumph racing buddies, and we were discussing
a new oil pump design for the TRactor motor (TR-3 / TR-4) that came out of the
Chicago area Triumph club. I realized that I may not have properly promoted
this product. Steve Yott (aka "Drippy") has developed an oil pump design based
on the stock pump, but with some important modifications. The rotor and shaft
are NOT two separate parts, but are one piece - eliminating one of the failure
modes of these pumps. Also, the end cap has been machined to accept a new
shaft sticking out of the bottom of the rotor - so the rotor is supported on
BOTH ends, rather than the stock single end support. The end plate is pinned
to the main housing so that the location of this bore is consistent upon
disassembly and reassembly. The rotor has oil passages in key places ensuring
that all of the moving parts ride in an oil bath so there is no metal on metal
contact.
Steve Yott is at tr4@wi.rr.com . I believe the price for this was $225 with a
core exchange.
There are two primary failure modes of the stock oil pump. One mode is the
tangs breaking off of either the oil pump shaft or the distributor drive, and
the other mode is the rotor spinning on the shaft. They believe that the tang
breakage is caused by "wobble" in the rotor due to it only being supported at
one end. This causes binding and additional force on the tangs. The new pump
eliminates this wobble with the shaft sticking out the bottom of the rotor.
The second mode - the rotor spinning on the shaft - is eliminated by the rotor
and shaft being made out of a single piece of steel.
This is one of those parts that "just seems right". I ran one in my motor all
last season and had excellent oil pressure the whole year.
For some reason the newsletter detailing this part doesn't seem to come up from
the links on their website, so I've taken the liberty of scanning an old beat
up copy of that article to my website here:
http://www.tonydrews.com/OilPump0001.pdf .
- Tony Drews
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