Richard Sohn wrote:

The RX7 manual states the metering pump performance check with

engine

RPM,

run time and amount of oil injected.
Last week I build an adaptor to put inbetween the pump and the

engine,

run

it with an electric motor at the right speed feeding 2stroke oil

at

6"

gravity. The output is as required by Mazda.
As soon as the design is completed I will need somebody to run

it on

an

engine, because I do not have one running at this time.

Richard Sohn.

The Mazda pump puts out oil as a function of both RPM and throttle

opening.

What RPM is your electric motor running at?

Paul Lamar

My electric motor is running at 1000RPM, which is 2000 E-shaft

reduced

2:1

by the pump drive.

Richard

You need to run that pump at the same speed the Mazda pump runs at

when

the engine

is running 6000 RPM WOT. That is when the apex seal oil requirements

are

the

highest. The first job of the apex seal oil is to cool the cast iron

seals.

If you run ceramic seals you might be able to get away with less apex
seal oil as ceramic seals can operate up to 1000 degrees C. The
strength of the material surrounding the seal slots in the iron rotors
could also be affected if this area of the rotor runs too hot.

Paul Lamar

I did this strictly to Mazda spec.

Richard.

Mazda specs at 6000 RPM wide open throttle or what they had in the shop

manual?

Paul Lamar

In the shop manual.

Richard.

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