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