What is a Sohn adaptor (adapter)

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warpc0il
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What is a Sohn adaptor (adapter)

Post by warpc0il » Sat Aug 12, 2017 12:29 pm

The Sohn Adaptor is an Oil Metering Pump adapter invented by Richard Sohn* for use in experiment aircraft powered by Mazda rotary engines, see Aircraft Rotary Engine News, is manufactured by PCV Technologies and sold by Rotary Aviation , among others.

There are two versions available, one for the RX7 and one for the Series 1 RX8. They don't make one for the Series 2 RX8 (aka R3 in the UK).
PCV TECHNOLOGIES wrote: USER MANUAL

Metering Pump Adapter for Wankel Engine.

PARTS LIST:

ITEM QUANTITY
-------------------------
Adapter Assembly 1
Bolt 2
O-Ring 2

Description.

Wankel engines such as the one used in the MAZDA RX7 sports car need oil in the combustion area for lubricating the metal seals.

Most stock engines use a metering pump pumping a small amount of engine oil from the oil pan into the intake manifold and/or directly into the combustion chamber. Engine oil is designed to lubricate sleeve bearings and carry heat from the engine interior to some cooling areas. In the RX7 the heat is removed from the oil in an oil cooler. When engine oil is getting into the combustion chamber, it only is burning partially, leaving some unburned deposits behind. These deposits can build up and reduce engine performance.

One obvious method of preventing this is to disconnect the metering pump altogether and mix two-stroke oil to the gasoline like some older two-stroke engines require. With this method it has been demonstrated that two-stroke oil is an effective lubricant and there is no build up of combustion residues.

The Metering Pump Adapter, as offered by PCV Technologies takes the solution one step further in allowing to still using the stock metering pump but supply it with two-stroke oil.

With the Adapter installed, all that is needed is a small oil tank with two-stroke oil, connected to the Metering Pump Adapter. The oil level in the tank should never be less then 6" above metering pump.

Oil consumption is approximately 1/100 of fuel used.

Richard Sohn
8029 HWY 1087
DeFuniak Springs,
FL 32433
Tel/Fax(850)834-4905
mailto:unicorn@aic-fl.com
Dave
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Re: What is a Sohn adaptor (adapter)

Post by warpc0il » Sat Aug 12, 2017 12:52 pm

An alternative product, based on the same concept, with improvements, is currently being offered by Ryan Rotary on a group buy

See http://www.rx8ownersclub.co.uk/forum/vi ... &start=178
Dave
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