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  1. #13
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    Nov 2006
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    114
    fantastic!!
    you gotta admire a guy thet makes his own foam patterns for his own castings for his own design and then machines them and assembels them into a working thing of beauty.
    My ownly other question is what is your anticipated operating pressure and then what does the engine wiegh?
    I'm still in the design stages of a 3cyl engine with a relitivly small bore and stroke that runs on 1000psi steam. The plan being to reduce the size and wieght of the engine and steam consumption by running at the higher psi.
    I get no help from the guys in the steam clubs I belong to on this because they are all fire tube/traction engine and locomotive types and get scared when I start talking about high pressure water tube boilers and the like.

  2. #14
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    Aug 2005
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    12
    Hi Merl,
    This engine weighs 80 kg and the operating pressure will only be 250psi.
    If you make a water tube boiler with steel tubes then 1000 psi is possible.
    Regards Dale

  3. #15
    Gold Member
    Join Date
    Jul 2005
    Posts
    12177
    I have a question: Steam engines, piston type that is, are appallingly inefficient. If you are going to the complexity of making a multi-cylinder engine why not do something with compound expansion to get improved efficiency?
    An open mind is a virtue...so long as all the common sense has not leaked out.

  4. #16
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    Aug 2005
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    12

    Vee 4 Compound

    Quote Originally Posted by Geof View Post
    I have a question: Steam engines, piston type that is, are appallingly inefficient. If you are going to the complexity of making a multi-cylinder engine why not do something with compound expansion to get improved efficiency?
    Hi Geof,
    This vee 4 engine can be compound just by changing the manifold.
    Compounding is great if designed to do so but all of the locos I have built work very well without compounding. At full speed and power efficiency drops off.
    Check this engine out, it has 4 cylinders 4" bore x 5" stroke.
    Regards Dale
    Attached Thumbnails Attached Thumbnails garrat.jpg  

  5. #17
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    Nov 2006
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    114
    Yes Dale, you're right.
    I'll be using stainless steel diesel injector lines initaly but, have another plan on the boards once I safely attaine 1k psi.
    This is all going for a hy-brid, motive power sorce I have been working on (and off) for a few years now. I'm close to a working unit but, I am having some design issues that are causing some vibration problems at the higher operating rpm needed by the engines small torque window.... I don't want to bore you with the details that you are probably already aware of.
    If you don't mind I may wish to PM you with some discusion on the water tube stuff ?
    By the way I think you have an obsean amount of fun with your loco !

    merl

  6. #18
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    Join Date
    Dec 2005
    Posts
    13

    Re: Vee 4 Info

    II Like your chain tensioners and oil pumps, Very well done !!!

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