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Re: [Fot] Uprated Oil Pump, TR-3/4

To: Tony Drews <tony@tonydrews.com>
Subject: Re: [Fot] Uprated Oil Pump, TR-3/4
From: Bill Babcock <billb@bnj.com>
Date: Tue, 19 Jan 2010 19:11:08 -1000
Nice. Obviously a better design. I've broken enough of these. I'm getting at
least one.


On Jan 19, 2010, at 6:11 PM, Tony Drews wrote:

> One thing I forgot to mention - one of the mods that Jack made to the stock
style shaft is to radius the slot so that there are no sharp corners or
"stress risers" to help reduce tang breakage.  I discussed this with Steve and
he pointed out that his slot is also designed with a radius at the bottom of
the slot in the oil pump shaft.  It's a pretty small radius so that's why I
missed it, but it's there and should be all that's needed.
>
> - Tony
>
> At 11:32 AM 1/19/2010, Tony Drews wrote:
>> 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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