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  1. DesignOutsourcing

    EFI controllers

    Hi Jonathan, Let us know what you have and put it on this forum as there are bound to be others interested. cheers, derek Derek White www.design-outsourcing.com
  2. DesignOutsourcing

    EFI controllers

    Thanks both Pat and Pete, The microtech (www.microtech-efi.com) and Haltech are a bit more expensive (retail) than the controllers we are already using but I'll find out what OEM deals they can offer. I'll get a Microsquirt beta model to test as they are small and the price is well below the...
  3. DesignOutsourcing

    EFI controllers

    I agree that for aircraft the reliability is absolutely the first priority which is why we want to have two EFI/ignition controllers and two separate systems for redundancy. Price often has little to do with reliability. We would like a simple system as it is less likely to fail. Lower price...
  4. DesignOutsourcing

    MYT engine -- anyone heard of it?

    This type of engine was patented by Singer more than 50 years ago I think. There was a lot of discussion about it a few years ago-- some good info from Melchor in Spain. Greg Locock put it online at: http://members.optusnet.com.au/greglocock/ Derek White www.design-outsourcing.com
  5. DesignOutsourcing

    EFI controllers

    Hi Greg, They also have a new minisquirt coming out soon which is the smaller version of the Megasquirt 2 (which is very powerful, cheap and has ignition mapping too.) I think it is an excellent system but there must be something off the shelf which is simpler than building your own and still...
  6. DesignOutsourcing

    EFI controllers

    Thanks Fabrico, Do they sell this to other OEM suppliers and any idea of the price and who to talk to. Maybe we're too small at just a few hundred units a year. cheers, derek Derek White www.design-outsourcing.com
  7. DesignOutsourcing

    EFI controllers

    Hi all, I am helping a small Swedish company with sourcing lower cost parts for their injected DOHC Vee twin industrial engines and one thing that they are paying way too much for is their EFI controller. Since most of their current applications require a fairly constant rpm, no complex mapping...
  8. DesignOutsourcing

    Sources for large CNC foam cutting machine

    Thanks for the lead David, I had a look and these are hot wire cutters and cannot cut a complex curve. I have found a few suppliers and the bigger machines start at about half a million new and are about $150,000+ used. We will probably retrofit a 5-axis welding robot to be a 5-axis milling...
  9. DesignOutsourcing

    Port & Polish to a mirror finish

    Hi Don, The tumbling air along the port walls may also help keep the fuel suspended in the air and stop it sticking to the walls. Send me some info on what setup works well for you as later this year I'll probably be building an approx 600hp Audi 4.2 V8 (essentially two of yours glued...
  10. DesignOutsourcing

    Port & Polish to a mirror finish

    Very pretty work Don but you may get better power from the inlet ports if you scratch them up a bit with about 60-80grit paper perpendicular to the air flow. Several people I know who do heads for a living insist that the roughness gives tiny localised eddy currents or swirl which improves fuel...
  11. DesignOutsourcing

    Sources for large CNC foam cutting machine

    Hi all, I'd appreciate any leads, suggestions and advice on buying a large 3 or 5-axis CNC machine to cut foam plugs for making composite moulds. What are the drawbacks with only having 3 or 4-axis vs. 5-axis. New, used or DIY would all be useful as we are on a relatively tight budget. Our...
  12. DesignOutsourcing

    E85 Fuel

    It might be easier to put a manual, time or temperature switched resistor in series or parallel with the AF meter. Hook up a multimeter to the AF meter, see which way the resistance goes when you move the flap, then use a variable resistor (in parallel to lower the resistance if the resistance...
  13. DesignOutsourcing

    E85 Fuel

    Thanks fvincent, I'd forgotton about the source of the carbon the the sugars. I think you can get about 10-15 tons of corn from and acre and about 400 litres of ethanol per ton of corn so thats about 4000-6000 litres of ethanol per acre. Sounds pretty good to me! Someone else can figure out...
  14. DesignOutsourcing

    Different bore/stroke within same engine

    The Saab variable compression (SVC) engine must be the one E55 is thinking of. The head and cylinders move up and down (pivoted one side and cam on the other. Here's a good picture and you can find more with a google seach. http://www.km77.com/tecnica/motor/motorsaabsvc/gra/00002D.jpg Join us...
  15. DesignOutsourcing

    E85 Fuel

    Last time I checked (when I had a brewery) the production of ethanol by fermentation of sugars produces a lot of CO2 so unless there is some new way of making the ethanol, that CO2 has to count in the big picture. There seem to be more and more flexifuel cars around here in Sweden, I'll try to...
  16. DesignOutsourcing

    Reverse Combustion Chambers in a DOHC head

    Raising the top ring will give you more metal under the top ring (which is where they break with high boost as you probably know.) I can't think of why you would need more metal above the ring than is needed to pull the ring down (and perhaps "shelter" the ring from combustion temps.) Why are...
  17. DesignOutsourcing

    Does anyone know the patent status of the Wankel-type rotary engine?

    Keep us posted headintheclouds as a diesel rotary sounds like a great aero engine. Ther are lots of leads if you search diesel wankel on google. cheers, derek Join us at http://groups.yahoo.com/group/opensourcecars
  18. DesignOutsourcing

    Twin engine drive

    How about using the sprockets and chain from a transfer case to link the two engines and then driving your third shaft off one of the two (mated) cranks? Most 4x4 tranfer cases use chains so they are cheap and easy to find in scrap yards. If you google images of transfer case chain you'll see...
  19. DesignOutsourcing

    an unconventional question

    Wang, Most shock loads are overcome by the inertia of the rotating parts of the engine (usually including a flywheel.) The easiest way to reduce shock loads is to "overcome/absorb" them in a flywheel. If your intention is to protect the engine or the chain from these shock loads, then the...
  20. DesignOutsourcing

    Conrod failure modes

    Here is a link to an MSc. thesis on rod design which I found very useful. Hope this helps: http://www.autosteel.org/pdfs/bar_connecting_rod_thesis.pdf cheers, derek Join us at http://groups.yahoo.com/group/opensourcecars

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