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Recent content by MRBB

  1. MRBB

    Head material.

    We are machining a DOHC head out of an aluminum billet. Any suggestions as to what type of aluminum to use?
  2. MRBB

    Upgrading from Autocad 2000 to autocad 2002??

    Dan, Inventor will not be of much help for architectural. Inventor works very well for mechanical things. My students use Inventor for drawing parts that they then build. I have used ACAD for 3D several years ago, and I hated it, it didn't work very well at all for my taste. I also took 3D...
  3. MRBB

    DOH Cam Head Design

    We found another little problem, or rather question. We went to the RB Racing web site. They have a calculator for RSR Inlet Runner and Peak Torque Calculator, you all have probably seen it, or maybe even wrote the thing for all I know. When we plug our numbers in, the calculator tells us that...
  4. MRBB

    DOH Cam Head Design

    Thanks for all the great ideas and information. My student and I are firming up some ideas on this head design. We still have some questions. We think we understand the idea of squishing off the intake side, but would rather use the flat top piston designed for our block. Could we change the...
  5. MRBB

    DOH Cam Head Design

    Sean suggested, I think, using more than one spark plug. This idea was suggested to the guys working on this project, and they were advised by an automotive instructor, not to go that route unless they had a method of delaying the second plug. The instructor was worried about starting the fire...
  6. MRBB

    DOH Cam Head Design

    We have a heat problem, we can't keep the engine hot enough. A good high mileage car will burn its engine for only about 3 seconds and coast for almost 60 seconds with the engine off. We have considered wrapping the engine block with aluminum tubing, a storage tank, radiator, coolant and a...
  7. MRBB

    DOH Cam Head Design

    Holy crap! Thanks for all the help, I think we have our hands full now. We will do some research on casting also.
  8. MRBB

    Upgrading from Autocad 2000 to autocad 2002??

    If you are looking for a good 3D modeling program, Autodesk Inventor is the way to go. I am a student who has had a fair amount of AutoCAD experience over the years and going to 3D is very easy with Inventor.
  9. MRBB

    DOH Cam Head Design

    This idea of a 4 valve head came from a SAE paper about making a 50cc 4 cycle engine more fuel efficient. The student I am helping, is required by rules of a Super Mileage challenge to use a 90000 series Briggs engine, 3.5HP. We don't understand the heat rejection problems you are talking...
  10. MRBB

    DOH Cam Head Design

    No, we do not need to take the head apart. The reason we want to build this thing in three parts , is so we can mill the ports in, nice smooth arcs.
  11. MRBB

    DOH Cam Head Design

    A student I am working with is designing a four valve head for a 3.5 Hp Briggs engine. We are planning to make the head in three parts. The parting lines join in the combustion chamber. How could these parts be joined and still have compression? Does anyone have any good ideas?
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