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Thread: The Bucket Foundry

  1. #3316
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    Quote Originally Posted by Frits Overmars View Post
    They use that mixture for speedway tracks. If you are going to use it for casting moulds, please let me know, so I can make sure I'm not in the same time zone.
    I've seen the effect of a little moisture left in moulds and with the temperatures at hand I suppose oil won't behave much differently.
    Oilsand is actually still used - probably it's a little better than engine oil and cement of course! and sometimes builder's lime is used in the making of furnaces amongst other stuff like fireclay, refractory cement and sand.(and yes, ordinary Portland cement is known to have been used as well!).

    I think that a lot of different mixtures could be used (especially in the making of cores) from molasses, to flour, to cow dung! Then some moulds are made with plaster of paris and silica sand. Greensand for moulds is made with a little bit of fireclay and water. (yes water Frits).
    Flettner makes his moulds from sand mixed with silica gel and hardened by passing Co2 through it, making it a very good mould which stays together when moved around - he gets some great results.
    Ken is also into casting pistons amongst other things.

    However, it's not a very precise process really, a bit like being a baker with all the ingredients in your head and the ability to know how much of what to use without a book! - In fact, desigining a burner is a bit like building and tuning a Bucket engine, except that you can't take it for a test ride!
    Strokers Galore!

  2. #3317
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    Quote Originally Posted by Frits Overmars View Post
    They use that mixture for speedway tracks. If you are going to use it for casting moulds, please let me know, so I can make sure I'm not in the same time zone.
    I've seen the effect of a little moisture left in moulds and with the temperatures at hand I suppose oil won't behave much differently.
    petrobond is very commonly used in the industry. that mix mentioned above with cement, just replaces the sand with finer cement it doesn't actually set like concrete.
    Also they should still use synthetic two stroke instead of motor oil.
    here is a simple reciepe
    http://www.foundry.ray-vin.com/k-bond/k-bond.htm
    Greensand is I note also dampening with water to make it bond.
    Using concrete is another mater. any moisture traped within the concrete can cause an explosive release of superheated steam.
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  3. #3318
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    A very interesting subject, this foundry business and although I haven't progressed very far as yet, I have learnt a lot here and I hope that this summer will bring more results.
    It's good to be able to experiment with the different mixes, techniques etc. and also be able to make things you couldn't possibly buy off the shelf or afford to have done by a commercial foundry.
    It's really a seperate hobby, but it does tie in well with experimental bikes!
    Strokers Galore!

  4. #3319
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    The spoils of home foundry, just back from Ashburton, nikasil plated.
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  5. #3320
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    Quote Originally Posted by Flettner View Post
    The spoils of home foundry, just back from Ashburton, nikasil plated.
    And the little pots of castor base assembly lube too...

  6. #3321
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    Quote Originally Posted by Grumph View Post
    And the little pots of castor base assembly lube too...
    Don't forget the smarties

  7. #3322
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    Quote Originally Posted by Flettner View Post
    Don't forget the smarties
    Damm - they're still sitting on the bench in the workshop, tomorrow.

  8. #3323
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    They look every bit as good as my CPI cylinders. Unbelievable what you produce.
    Don't you look at my accountant.
    He's the only one I've got.

  9. #3324
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    Quote Originally Posted by Flettner View Post
    The spoils of home foundry, just back from Ashburton, nikasil plated.
    Are those castings in LM13? easily plated?
    Think I'll have to ask you to explain those slots around the exhausts to me again, I haven't quite got it yet! musn't have been paying attention!
    Strokers Galore!

  10. #3325
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    Quote Originally Posted by F5 Dave View Post
    They look every bit as good as my CPI cylinders. .
    Yes they come back from NZ cylinders looking nice, they do good job.
    Yes they are LM13 and nikasil will stick to this material well.
    Slot is for the power valve blade.

  11. #3326
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    Bottom end is back together, new cylinders installed, will have to organise some power valve blades and an actuating system.
    Valve blades will have a gear rack cut into them. There will be a small gear that will engage with this rack.
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  12. #3327
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    Quote Originally Posted by Flettner View Post
    Bottom end is back together, new cylinders installed, will have to organise some power valve blades and an actuating system.
    Valve blades will have a gear rack cut into them. There will be a small gear that will engage with this rack.
    I guess the power valve blades are made of steel? - Will you need a damper (seeing it's rack and pinion)?

    Those photos make it quite clear that the injectors will be facing into the stream!
    Strokers Galore!

  13. #3328
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    Quote Originally Posted by WilDun View Post
    I guess the power valve blades are made of steel? - Will you need a damper (seeing it's rack and pinion)?

    Those photos make it quite clear that the injectors will be facing into the stream!
    No injectors on this engine but lugs are for the future. This is the same cylinder I'm using on the 360 reverse cylinder YZ engine.
    PV blades will be anodized aluminium.

  14. #3329
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    A and B port injectors, I wanted to take Flettners advice and do that too but on my NSR cylinder the power valve pulley gets in the way of the front right "A" injector.

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  15. #3330
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    Surely if it can't be rotated around and still have the travel, it could be moved outbound enough?
    Don't you look at my accountant.
    He's the only one I've got.

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