A unique opportunity to own a bit of history.This SACHS KM48 wankel type rotary engine was supplied in the early 1980\'s to the UK militaryas part of a kit of sparesfor their super silent generator sets.Apart from being tested in the factory the engine has never been used. It will be supplied fully wrapped, unopened and all the parts have been oiled for storage.It really is like brand new inside. I opened one unit up to take some photo\'s so you can see the condition of the parts and, as you can see from the pictures above, everything looks brand new.Whether you\'re just interested in how these engines work, need a replacement for your aging KM48 unit or plan to use it for a project this is a perfect opportunity to purchase a brand new version of the now very rare KM48 power unit.
Technical SpecificationBuilderFichtel & Sachs AG, Schweinfurt, Germania 1965TypeKM 48DescriptionWankel rotary engine, single rotor, aluminum engine blockDisplacement160 cm³Compression ratio8,0:1Power8 CV at 4700 rpm (10 CV at 5000 rpm, version K8B)Fuel specific consumption315 g/CVhFuel systemgasoline with single barrel carburetorIgnitionone candle powered by distributor, inductive discharge systemCoolingairLubricationmixture of petrol and oil ratio of 50:1A Bit Of History
The KM48 Sachs Wankel engine was available from the late 1960’s through the early 70’s and is a 160 cm3, single rotor, air cooled engine developing between 8 hp and 10.5 hp (The horsepower varies depending on what F&S manual you look at).
Sachs designed the engine to be used as power for rototillers, pumps, generators, lawnmowers, etc, etc.. much as B&S, Tecumseh, Kohler and others do in this country. Despite extensive testing, (and the best efforts of Sachs\' sales & marketing departments), - it is not believed that these small Wankel motors were very popular. Larger displacement versions of the F&S rotary combustion engines were available in the USA and Canada on snowmobiles. There is very little information regarding the Italian company (Moto Attrezzi) that assembled and sold the motors – they did not even include their name or corporate information in the instruction manual!
The KM48 runs on 50:1 oil/gas mix and, since it is air-cooled, it is preferable to use a quality chain saw or motorcycle oil on this motor (I run my one at 40:1 for added protection)
Even though you mix the gas an oil together for lubrication the rotor and seals, this motor is not a 2-stroke. Wankels are unique in that they have induction, compression, combustion and exhaust cycles but are also not 4-strokes since they do not reciprocate. A happy compromise would be to describe this motor as a 4-cycle burning pre-mixed fuel and oil for lubrication.
My BackgroundI\'m a qualified mechanical engineer with over 10 years experience in the design and development of small air and water cooled rotary engines for use in drones, cars and generators. I bought a few of these Sachs KM48 engines as they\'re very closely related to some of the engines I\'ve worked on in the past. If you need any help with the engine, I\'m alwaysavailableby e-mail or phone. I also have plenty of spares - carbs, spark plugs, balance weights - whatever you need to get up and running.
Don\'t miss out - I only have a few of these left and they\'re very rare so get offerding and good luck!
