From:Ian Davidson
Subject:RE: RE: RE: RE: Shower Head Pic Date:Fri Mar 22 10:32:48 2013
Response to:4671
John,It seems even the smaller Delux pump produces enough pressure and flow initially it,s the heat that needs controlling to be able to supply the extra oiling needed in Marks modification to make it successful.It would be interesting to hear from some of the guys running external oil filters with enough surface area or exposed tubing to affect cooling if they have noted better viscosity in those machines under the same conditions.Many questions? Ian>>>>>>>>>>>

Sounds like the next step is to upgrade the oil pump with a
spacer and some wider, re manufactured gears. Can only hope
to boost pressure though as the 3/8" tubing is only going to
flow so much oil.

Mark ,Have been following your progress on this immense
undertaking.The question comes to mind of what is the effect
of bleeding off the pressure in the crankshaft?particuliarly
in a motor at full operating temperature?I have found that
plugging the tailshaft and forcing the oil thru the side
hole as in the Indian engine will increase the viscocity and
length of time it takes to reduce it.but it does not
eliminate it and a pressure drop ensues when running the
type of miles you guys were running on the cannonball
particuliarly at high altitudes.It seems a transmission that
has enough oil mist and pressure to drive or pump the oil up
the shift tower to cause a leak should be sufficient to
lubricate the plain bronze bearings or in the case of the
cluster babbitt or aluminium of the Henderson.Short of a
modification to run a roller or ball bearing not sure if
there is a way out of this one.Looking forward to seeing
your mod on the mainshaft. Ian>>>>>>>>>>>>>


The Cannonball exposes weekness that can only be learned on
that type of brutal, non-stop competition. I watched three
of the Wolfpack Hendersons run wounded. Bramwell's was the
worst(he could only cruise about 75mph). Cutter, you got
the video that day in Iowa when we were smoking the entire
line of bikes. See if you can get it to Dave H. It would
be cool if he could add it as a link. It was great smoking
those HDs.

We had torn up some mainshafts on some of the bikes due to a
materials compatibility issue. During one of our gas
station engineering sessions, we began talking about taming
the Henderson transmission.

Our modern motorcycles and dirt bikes all shower and
pressurize the transmission. With the type of power we are
making now, and on long, sustained pulls, it became apparent
we were not cycling enough oil through the transmission.
This was probably partially due to the line boring process I
employed. The shims that I use between the bearing halves
get bored 360 degrees along with the bearings.

Originally the Henderson shims were not set up like this.
They stood back off the edges of the shafts which probably
allowed for some oil in the rear bearing to effectively
"puke" back around the small bevel gear (to use an
engineering term)- completely inadequate in its own design
as the lack of a 360 degree bearing is kicking the hell out
of the hydrodynamic lubrication of the shaft itself.

Discussion of our situation led to the topic of the late
model Indian Fours having a drilling off the pinion support
bearing, showering the bevel gears with a jet of oil (1940 -
1942). Yes, Barry, I updated your '36 to this spec. We
were pushing these bikes hard, and they let us know what
worked and what didn't.

It would be very difficult to achieve the Indian style
shower effect with a Henderson case due to the differences
in geometry of the saddle support of the case. Everyone was
in agreement that we needed to figure out how to get oil
from the tail stub of the crankshaft to the transmission.

Mike Fockler (#65) offered up one of the suggestions that we
think will yield big results. We would wire EDM, an oil
hole, through the pinion gear at an angle to provide a
shower effect to move more oil back to the transmission
area to cycle oil through the system. This gets us a shower
on the gears but it still does not address the lack of
hydrodynamic lubrication of the main shaft. Wait until you
see what we are doing with the main shaft.