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  1. #1
    Join Date
    Oct 2016
    Location
    Melbourne
    Posts
    174

    Default Sachs Wankel Engine

    I have a couple of Sachs KM24 engines that i got a few years ago and now is the time to get them running. They both have stuck apex seals,as you can see this one was rusted in i got it free but snap the side seal and corner spring Parts for these engine a getting hard to get,but found a chap who sold me some news side seals and corner springs. The parts have just landed here in Melbourne, so should have the engine back together soon

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  2. #2
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
    Age
    67
    Posts
    3,860

    Default

    Thanks for the pics, what are you going to use it for when its finished?
    Kryn
    To grow old is mandatory, growing up is optional.

  3. #3
    Join Date
    Oct 2016
    Location
    Melbourne
    Posts
    174

    Default

    Quote Originally Posted by KBs PensNmore View Post
    Thanks for the pics, what are you going to use it for when its finished?
    Kryn
    G'day Kryn,
    you welcome, i think i will sell one of them and use the other in a motorcycle or maybe a go kart.
    Cheers,
    Mark.
    A-Short-History-of-Wankel-Motorcycles-The-Vintagent-bsa.starfire.jpg

  4. #4
    Join Date
    Jul 2016
    Location
    Melbourne
    Age
    30
    Posts
    893

    Default

    Do these have Mazda style oil injector or oil mix type system for seal lubrication? Did these Sachs sell in big numbers?

  5. #5
    Join Date
    Oct 2016
    Location
    Melbourne
    Posts
    174

    Default

    Quote Originally Posted by caskwarrior View Post
    Do these have Mazda style oil injector or oil mix type system for seal lubrication? Did these Sachs sell in big numbers?
    No oil injector,just oil petrol mix. for lubrication of seals and bearings. There were 30,000 of the 303s Sachs engines built as for the KM 24, 37 and 48 engines i guess several thousand units were made they were use for outboard motors, motorcycles,chainsaws, lawn mowers,light air craft. snowmobiles.pumps, and generators.They come for sale now and again on ebay.
    Cheers,
    Mark.

    !cid_CAC2FED6-E18C-416C-A8A4-E0898BC9AB90.jpgdd1edf85ef5b0a49578b549a82d64166.jpgimage123.jpgimage1.jpgimage2.jpg

  6. #6
    Join Date
    Jun 2007
    Location
    Ipswich QLD
    Age
    63
    Posts
    1,649

    Default

    Ah you poor man!
    When these motors first hit the streets I was in awe of them in cars sweet sounding Mazda. Friend of mothers had one in the first 3 months it was more in the dealers workshop than on the road.
    These days I hear the familiar sound along the near by highway of a fellow taking his Rotary for a spin that lumpy sound still the same.

  7. #7
    Join Date
    Oct 2016
    Location
    Melbourne
    Posts
    174

    Default

    Quote Originally Posted by wheelinround View Post
    Ah you poor man!
    When these motors first hit the streets I was in awe of them in cars sweet sounding Mazda. Friend of mothers had one in the first 3 months it was more in the dealers workshop than on the road.
    These days I hear the familiar sound along the near by highway of a fellow taking his Rotary for a spin that lumpy sound still the same.
    Yeah a couple of friends had the rx4 and rx3 and yes they have that sweet sound was even better when they were modified. They are very high maintenance vehicle.

  8. #8
    Join Date
    Aug 2010
    Location
    Near Bendigo, Victoria, AUS
    Age
    67
    Posts
    2,694

    Default

    I saw one of the prototype BMW bikes with this engines in the very late 60s or 1970 at the IFMA in Cologne, Germany. It was fitted into a BMW 250 single frame, attached directly to the BMW gearbox and rear drive - in a frame shape not dissimilar to the Hercules you show above. I thought it was a ripper idea - alas it never went to production....
    Cheers, Joe
    again completely retired - more time to contemplate projects and spend more shed time....

  9. #9
    Join Date
    Oct 2016
    Location
    Melbourne
    Posts
    174

    Default

    Quote Originally Posted by jhovel View Post
    I saw one of the prototype BMW bikes with this engines in the very late 60s or 1970 at the IFMA in Cologne, Germany. It was fitted into a BMW 250 single frame, attached directly to the BMW gearbox and rear drive - in a frame shape not dissimilar to the Hercules you show above. I thought it was a ripper idea - alas it never went to production....
    Yes there was a lot of ideas floating around back then on what the rotary can be used on, the engines i have are ~23 HP and hardly any vibration compared to a piston engine. Here is a vid of a KM 48 engine i had and you can see it not shaking all over the place. https://www.youtube.com/watch?v=gvG8M_z6Y08&t=14s

  10. #10
    Join Date
    Oct 2016
    Location
    Melbourne
    Posts
    174

    Default

    I finish cleaning some of the parts and The new parts have arrived and have started the rebuild, clean all the carbon off the seals and springs. I installed seals and springs on one side of the rotor

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  11. #11
    Join Date
    Oct 2016
    Location
    Melbourne
    Posts
    174

    Default

    OK got the engine back together and tried to start it no go I replace the coil and got it to start but can't get it run. So i will replace the points,condenser , replace the fuel pump and check the timing.

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  12. #12
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
    Age
    67
    Posts
    3,860

    Default

    There's not a lot of moving parts in that motor is there, unlike a conventional two stroke motor.
    Kryn
    To grow old is mandatory, growing up is optional.

  13. #13
    Join Date
    Oct 2016
    Location
    Melbourne
    Posts
    174

    Default

    Quote Originally Posted by KBs PensNmore View Post
    There's not a lot of moving parts in that motor is there, unlike a conventional two stroke motor.
    Kryn
    No and they are very easy to dismantle and rebuild.

  14. #14
    Join Date
    Oct 2016
    Location
    Melbourne
    Posts
    174

    Default

    I had a good read on the manual last night and did a test on the fuel pump,as what the manual was saying to do. I knew the pump was a bit dodgy the vale was sticking and these units are sealed so you can not repair them so replace with a new pump and BINGO shes up and running No need to replace the points, condenser shes running real sweet Got a short vid of the engine at idle will make a better vid once i tidy up the wring.

    https://www.youtube.com/watch?v=ZAvXeeSTgAk

  15. #15
    Join Date
    Oct 2016
    Location
    Melbourne
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    174

    Default

    I tidy up the wiring and hook up a kill switch, as you can see in this vid there is fuel dripping out of the over flow pipe when at idle.I'm not show why this is happening

    https://www.youtube.com/watch?v=Kl15FPAZ8EM

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