I have never seen any oil pump on any engine going back to designs around since
the early 20th century that were not geared, except for the B&S engine which
uses a scoop on the bottom of the connecting rod cap to supply pressure oil.

genee/rickie claim non-geared oil pumps on engines are common. Anyone know
which engine designs used oil pumps that are not geared?

I have seen one engine diagram that used a non-geard pump. It used 2 figure 8
shaped lobes that were mounted perpendicular to each other. I don't remeber
what engine it was but I seem to recall it being a straight 8 for some reason.
Its anyone's guess about who made it. The book was printed sometime in the
1940's. Other pumps of this style were known for large volumes but at low
pressure. Who knows, low pressure oiling was common on early engines.

Dennis
ASE Master Auto Tech and Marine Engineer in training--but JAX believes I should
go back to study hall)

I have never seen any oil pump on any engine going back to designs around
since
the early 20th century that were not geared, except for the B&S engine which
uses a scoop on the bottom of the connecting rod cap to supply pressure oil.

genee/rickie claim non-geared oil pumps on engines are common. Anyone know
which engine designs used oil pumps that are not geared?

It used 2 figure 8
shaped lobes that were mounted perpendicular to each other

I guess that is not geared, huh.

Marine Engineer in training

yeah, sure.

but JAX believes I should
go back to study hall

or give up all together and stay driving a forklift

In article ,
(JAXAshby) wrote:

I have never seen any oil pump on any engine going back to designs around
since
the early 20th century that were not geared, except for the B&S engine which
uses a scoop on the bottom of the connecting rod cap to supply pressure oil.

genee/rickie claim non-geared oil pumps on engines are common. Anyone know
which engine designs used oil pumps that are not geared?

My Wisconsin powered 3Kw genset has a Cam operated oil pump that squirts
a stream of baseoil on the crank and rod bearings, as well as feeding up
an internal pipe to the topend.

You just haven't been around long enough to see some of the really cool
stuff, kid......


Bruce in alaska
--
add a 2 before @

Jax,
You need to be a tad more specific. A geared pump would describe and
pump driven by a gear train. A gear pump describes a type of pump that
uses the cavitly that develops/closes between the teeth of messed gears
(involute tooth face) to move a fluid.

If you mean non-gear driven pumps, there are lots of them. Many engines
have chain or shaft drive pumps, not includeing those directly on the
crankshaft.

If you mean oil pumps that are not gear type pumps, there are lots of
those out there too. If by gear you are trying to include all positive
displacement pumps, then you are nearly correct. But there are many
engines out there with vane pumps, internal lobe pumps and progressive
cavitry pumps as primary lube oil pumps.

Matt Colie - Sig at the end of today's enteries.

JAXAshby wrote:
I have never seen any oil pump on any engine going back to designs around since
the early 20th century that were not geared, except for the B&S engine which
uses a scoop on the bottom of the connecting rod cap to supply pressure oil.

genee/rickie claim non-geared oil pumps on engines are common. Anyone know
which engine designs used oil pumps that are not geared?

Esourcedesigns wrote:
I have seen one engine diagram that used a non-geard pump. It used 2 figure 8
shaped lobes that were mounted perpendicular to each other. I don't remeber
what engine it was but I seem to recall it being a straight 8 for some reason.
Its anyone's guess about who made it. The book was printed sometime in the
1940's. Other pumps of this style were known for large volumes but at low
pressure. Who knows, low pressure oiling was common on early engines.

Dennis
ASE Master Auto Tech and Marine Engineer in training--but JAX believes I should
go back to study hall)


I have never seen any oil pump on any engine going back to designs around
since
the early 20th century that were not geared, except for the B&S engine which
uses a scoop on the bottom of the connecting rod cap to supply pressure oil.

genee/rickie claim non-geared oil pumps on engines are common. Anyone know
which engine designs used oil pumps that are not geared?



My atomic 2 has a piston oil pump by pushrod from cam, I think. It
uses ball bearings in drilled holes for valves, and uses two
rattling loosely in the outlet valve cavity, which also contains a
mounting screw which passes through the body and outlet channel,
retaining the two ball bearings in working position, sometimes. One
has a habit of escaping unnoticed into the front main crank journal
when the pump is removed in the normal inverted dissasembly
position. Low oil pressure results, until the engine is again
dissasembled, the vagrant ball shaken out of hiding and reassembled
in the another position.

Don't ask how I know. I will say I had no idea one ball was gone
until I finally got crazy enough to dissassemble and examine the
works again, nor was it anything other than pure genius when I
deduced it must be so after examining the evidence for about two
minutes, after the second one also dissapeared on dissassembly. On a
white sheet of paper fell out the ball of logic, as the universe
rattled around the engine block in my arms.

No, it isn't mentioned in the shop manual, a copy of which was faxed
to me by Westerbeke, for 50 bucks.

Shine on.

Terry K

Matt Colie wrote in message ...

If you mean oil pumps that are not gear type pumps, there are lots of
those out there too. If by gear you are trying to include all positive
displacement pumps, then you are nearly correct. But there are many
engines out there with vane pumps, internal lobe pumps and progressive
cavitry pumps as primary lube oil pumps.

What would you call the pump Honda uses in Accords and Civics (or used
to use)? If I recall correctly, it was a 5 lobed rotor which ran
inside a 6 lobed ring. The ring rotated along with the rotor and the
rotor lobes would sweep through the indentations between the lobes in
the ring. In this way it had positive displacement, sort of like a
cross between a Wankel and a rotary vane pump. Internal lobed pump?

%mod%

modervador wrote:

What would you call the pump Honda uses in Accords and Civics (or used
to use)? If I recall correctly, it was a 5 lobed rotor which ran
inside a 6 lobed ring. The ring rotated along with the rotor and the
rotor lobes would sweep through the indentations between the lobes in
the ring. In this way it had positive displacement, sort of like a
cross between a Wankel and a rotary vane pump. Internal lobed pump?

Gerotor

Rick