Hey Paul,
I'm going to start disassembling my 20B  tomorrow, so if the rotor housings
are OK, I want to send them to you for  P-Porting, sealing plates w/ SS
tubes, etc.   Hopefully I will  know for sure within a couple of days,
provided
I am able to split  the e-shaft without a huge ordeal.

As I plan to take on another 20B  project, I was remembering back to the
last one I rebuilt about 7 years  ago.  Back then, there was a "metering
pump"
available from  someone that allowed us to inject 2 cycle oil from an
external tank (like a  boat) so that we wouldn't have to mix.  Do you know
if that is  still available from someone?

Don

That was Richard  Sohn.

Richard Sohn <res12@fairpoint.net>

Richard's device  works very well but if it were me I would mix because
Mazda used silly small nylon lines on the oil squirter's and they get old,
brittle and  fail.
If it were me I would have made them out of steel brake line  tubing.
Also the oil injector one way air sucking valves fail. There are a  lot of
old rotary engines in junk yards due to failed oil injection lines.  Mixing
it distributes the oil better in the rotor housings. Several years  worth of
RX8 engines died young due to not enough apex seal  oil.

Paul Lamar


Thanks Paul,
All valid points......that's why you're the Master!!   So is  everyone just
using a block off plate at the metering pump and plugging the  holes where
the oil injector lines connected to the rotor housings?
Don

I would. If you have the engine apart I would take the drive shaft out as
well. No point of having that in there spinning around doing nothing.

Paul Lamar



I chose to use Richards metering oil pump. I don't want oil settling in my
tanks. Plus I've never seen any metering oil pump injector failures in 35
years of my rotary  experience. BTW, my 20b shaft came right off without any
type of puller. I just put some pressure on it with a prybar and lightly
tapped it on the nose (with the bolt back in it) and it popped right off.

Bob Mears

Bob owns Mears Motors in Lubbock Texas and his parts department gives
great discounts on new Mazda rotary parts to members of this newsletter. Just mention the newsletter to the parts manager. http://www.mearsmotors.com/

"I'll make a killin' deal on any Mazda or Volvo for anyone on this list.
1 800 692 4497"   Bob Mears June 12, 2007 :) In case you are in the market
for a new RX8 :)

Bob is also building a 3 rotor powered scale Spitfire replica.

I agree about the Mikuni pump Bob. The pump does not fail. It is the cheap shit
plastic lines that get brittle and crack that fail.

In eleven years of editing the newsletter nobody has complained about the oil settling out of the fuel. There are a couple of reasons for this. When you start the engine
the fuel pickup in the tanks is at the lowest level generally so you might get
an oil rich mixture (as I recall oil floats on the top of the fuel) but that is soon returned to the tank by the fuel pressure regulator recirculating the fuel. At idle it recirculates as much as 90% of the fuel flowing through the pump.

The other thing that happens is you must taxi and airplanes do not ride like Cadillacs :)

There could be some unintended consequence for a non return system. I am mixing oil with the fuel in my 2004 RX8 to be sure my engine does not lack for apex seal oil. My RX8 sits around for months at a time as I use a beater for every day use. I connect up the battery and it starts right up with no oil smoke. As I recall, and as far as I can determines by reading all the shop manuals on it, it has a non return system. I think what happens is the fuel is returned locally in the tank in a non return system so the oil gets mixed pretty fast.

BTW if you don't disconnect the battery it runs down in a week or two for some strange reason. Do you know why that is Bob?

Here are a few pictures of Bob's spitfire. http://mears-spitfire.tripod.com/

Looks like it is getting close to flying Bob.

Paul Lamar