You also made the steel oil pump rods which I liked the best. They were easily adapted to the sleeved hub eccentric to provide a reliable pump. The sleeves I used were stainless steel giving a very long life to the units I put in engines.
And, if anyone is looking to put one in their engine, I still have one of Miles steel rods on the shelf.
Bill
> -----Original Message-----
> From:
> 2cylinderhondas@yahoogroups.com [mailto:2cylinderhondas@yahoogroups.com] > On > Behalf Of > feltonminicycle > Sent:
> Friday, October 23, 2009 7:29
> PM
> To:
> 2cylinderhondas@yahoogroups.com
> Subject:
> [2cylinderhondas] Re: Oil Pump
> The last oil pump rods I had made were aluminum with steel insert like the > originals. They had a 1/4" stainless pin which pressed in to the new pistons I > had made which also had 1/4" hole - of course having a press fit which keeps > the pin from tearing up the oil pump bore.
> I get the oil pump bodies
> sleeved in brass by the same guy that does my master cylinders. I had 10 > special sets of oil pump rods and driven hubs made to match. The rod had an > extra thick bushing installed and the eccentric was turned down to match.
> The problem for me was the cash outlay to get the whole project > running ($1500)and the extremely slow time it took to sell the rods or kits.
> Mike OConnor bought most of my rods. My profit was about zero as I had to > finish machining the rods for oil holes and oil grooves.
> Miles
> --- In
> 2cylinderhondas@ yahoogroups. com
> ,
> goinhm@... wrote:
> > Hi Bill,
> > I am not in total
> agreement with your statements. See my comments
> > below;
> > The Honda 600 oil pump rod is a case of an accident waiting to > happen.
> > Miles came out with a steel rod that when put together with a > steel sleeve on > > the eccentric will last for a very long time. I know, > because I have > > had one in a sedan for a number of years and it is > pumping great and the > > owner runs it all the time.
> > I
> don't think the oil pump has been a major problem. I have seen many an
> > oil pump with well over a 100,000 miles of use on it. I don't think
> > switching to steel in an improvement. If I am going to have metal on > metal > > contact and the resulting material showing up in my oil, I > would prefer to have > > aluminum in my oil instead of iron. The bearing > surface which Honda has > > chosen for the oil pump is aluminum. Any wear > which occurs will be aluminum > > particles which will have an > insignificant impact provided they stay > > microscopic. If you have iron > particles entering the oiling system, they can > > have a more > significant and damaging impact when they get into the steel and
> aluminum bearing surfaces found throughout the engine & transmission.
> > If the clearances on the oil pump and the eccentric area are > kept within > > serviceable limits (as stated in the manual), I believe > the amount of > > aluminum wear will be acceptable. Keep the oil clean > and change the oil & > > filter regularly.
> The air build up you are referring to is called cavitation, the build
> up of small bubbles along the sides if the piston or other moving parts as
> > the liquid flows past the metal surfaces. Because there is no > pressure > > there is no problem with cavatation as it will not reduce > flow because all the > > bearing surfaces fed by the oil pump are needle > bearings.
> > What I described was not cavitation. I was
> describing how I check out the
> > pump .... I squirt some oil into the
> cylinder and manually work the rod
> > into the body. The oil serves to
> lubricate and act as a seal. When I push
> > the cylinder toward the pump
> body, I am slightly compressing the air in the
> > cylinder. What (I
> think) you are describing is something which can
> > occur when the pump
> is operating in the engine.
> > The greatest problem is
> the amount of distance there is between the
> > rotating surface of the
> large end of the oil pump rod and the eccentric
> > surface of the
> sprocket drum. The greater the gap the greater the slap which
> eventually causes the aluminum casting around the steel ring of the rod to
> > crack and cause reduced pumping which affects flow. Low flow keeps > oil from > > getting to the cam box causing the end caps which are fed by > gravity to > > dry up and seize.
> > I agree the clearance
> at the eccentric is a major issue. I also have
> > noticed the wear in
> the cylinder bore of the oil pump to be a major problem.
> > The floating
> steel piston pin wears a deep groove into the cylinder. I wish > > they > had press fit the pin to the piston or put some Rulon (or Teflon)
> plugs to prevent the steel pin from contacting the aluminum cylinder > wall.
> > That is my take on the situation. Thanks for your
> comments .....
> > sometimes you have some ideas which make me rethink
> how I have been doing things.
> > Dale