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    Trembler Coils--(Constant spark)

    I built one and Wow it can bight! Burned right through the insulation of ordinary wire.
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    My Dad's Shop

    So many great memories. I have come to the conclusion that if I don't write my memories no one else will, I still have about 40 years to go. Ted from down under
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    Opposed twin Onan engine in half scale

    Reasons I was not happy with the dual carbys was after only a few minutes running heat transferred to the carbys and petrol began to boil, we have seen this problem in older cars especially in tropical areas. The balance between the two was very difficult to achieve. I mentioned cheating above...
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    Opposed twin Onan engine in half scale

    More on the Onan opposed twin in half scale, after a lot of fiddling we reworked the manifold and set up single carby, runs and starts much better. Then we revisited the shop made carby with some cheating, fitting the fuel pump/diafragme block to the side of a block of alloy with my original...
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    Opposed twin Onan engine in half scale

    An update on the Onan opposed twin in half scale, See it running After stripping it down and sealing some poor casting issues I still was not happy with starting and idling. Brian Rupnow's figures on cam design would have been very handy if he had uploaded them a couple of weeks earlier. Armed...
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    Opposed twin Onan engine in half scale

    I use a product we call Acetone available from hardware's, there is another product the Auto Painter's use to remove grease and finger prints off cars before painting, Wax Off or similar. Thanks for the questions, Ted
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    Opposed twin Onan engine in half scale

    Yes but I have a porosity problem with the sump casting, it leaks oil when not in use, not very much but it only holds a cup full. Have to take things apart and seal it with Locktite. I know that the 1920s Buicks had the same problem with the crankcase castings in alloy. Ted
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    Opposed twin Onan engine in half scale

    Latest on the Onan opposed twin in half scale, have run it several times lately and it is starting better and will almost idle. Some more work, pictures 1-3, a few days ago this was a perfectly good 20lt drum (4 gallon) picked up on the side of the street (thrown out for annual trash pick up by...
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    Opposed twin Onan engine in half scale

    Shortened Toyota engine.
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    Opposed twin Onan engine in half scale

    Hi Mark, the model, second pic, runs on 7 and a quarter inch track 184mm the engine is a Victa 160cc much modified, it will run either way, has car pointless ignition with 2 wings to activate the magnetic pickup 18 degrees before TDC in either direction. In operation the engine runs backward to...
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    Opposed twin Onan engine in half scale

    Some interesting engines about, some 2 stroke boat engines run with valves in the manifolds, allows for oil in the sump. Ted
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    Opposed twin Onan engine in half scale

    Yes Ignator I had too strong a spring in the valve and nowhere for the oil to go. The PCV valve on a multi cylinder engine actually works differently, it allows a small draw on the crank case at idle and a large amount at revs. My Onan powered welder began to leak at rear main oil seal but I...
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    Opposed twin Onan engine in half scale

    try this YouTube video, it is obvious I have had a win over the oil leaks, there was a crankcase pressurisation issue.
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    Opposed twin Onan engine in half scale

    The latest on the Onan opposed twin in half scale, it runs The Grandchester Model Live Steam Club Queensland Australia (of which I am a member) a new engineering trophy has been created in honour of 2 very resourceful and respected engineering men, it is my honour to be the first person to win...
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    Opposed twin Onan engine in half scale

    Thanks AlexS We have had it running again, we started it on the lathe and lets say I will not need to oil the lathe for a while! Still having trouble with valve sealing, had issues with timing and in the process put a piece of wire through the plug hole, finished up bending the intake valves...
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