Drag Racing 1/4 Mile times 0-60 Dyno Fast Cars Muscle Cars

Scale Model Running Challenger Flathead V8 By Ron Colonna

Challenger V8 Ignition: Spark Bore: 1 in. Stroke: 1 in. Displacement: 100 cc Max RPM: 6,000 This engine was built early in my gasoline engine building career. I received the castings and drawings as a Christmas gift from my wife. I had it running about five months later. This is the engine that creates the most interest at the shows. So much so that I've had to rebuild it twice because of wear. As designed, it had some major shortcomings. The conrods were bronze castings which promptly wore grooves in the crank. These were replaced with rods machined from 2024 aluminum. Pistons were remade and the engine fitted with rings made from the George Trimble method. Oil control rings are a necessity as the engine smokes badly without them. An electric start system was added and the engine now runs with the push of a button.


 


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Scale Running Model Harley Panhead Engine by Ron Colonna
V-Twin Panhead Ignition: Spark Bore: 1 5/16 in. Stroke: 1 1/2 in. Two Cylinder Four Cycle No Castings Used This engine was scratch built to a scale of 2/5ths or 40% of full size. The bottom end was taken from a drawing of a Knuckelhead engine that I puchased on e-bay. The top end was patterned after photos taken from e-bay of Harley parts for sale. I also bought a Harley repair manual that helped with the oil system. The crankcase was split into three sections instead of the usual two for ease of machining. The ignition is solid state and I use a GM coil which fires the two plugs simultaneously. Timing is advanced and retarded with the timer body. Two rotating magnets fire a Hall effect device at the proper times as per full sized points. The engine is large enough to produce that lovely V-twin sound.





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1/4 Scale Running Model Offenhauser (Offy) Engine By Ron Colonna
1/4 Scale Offy 270 This is a 16 valve double overhead cam powerhouse, with pressure oil feeds and dry sump lubrication. It is faithful to the prototype and uses the famous cup type followers. Eleven inches long and seven inches high. 1.032" Bore x 1.094" Stroke. 60 cc Displacement. (3.66 cubic in.) Compression ratio is 9.5:1. Uses solid state spark ignition. (Hall Effect with dual magnets) I knew a little about the famous Offenhausers, hearing about their conquests at the Indianapolis Speedway while growing up. I didn't get interested in building a copy of one until approached by Bob Washburn after doing my Cirrus article for SIC magazine. At the time Bob was looking for someone to develop the model, do the basic drawings, write machining instructions, and build two copies of the finished engine, in a one year time frame. He sent me all the data he had aquired at the time. I looked it all over, but had to send it all back. I was busy on other projects and it seemed a daunting task that I was sure I couldn't accomplish. I didn't forget the engine though, and some years later, a gift of Gordon White's book on the Offenhausers from my eldest son, put me in the frame of mind to give Bob's proposal a try, but on easier terms. It took me two years to do it all and I only built a single copy of the engine. I put my drawings and machining instructions in book form and published it myself. It has been a successful venture, but I was right about it being a daunting task. I'll most likely never try doing anything like that again. The engine has been, and is being built in many parts of the world. My copy has been running for eight years now and is a fine performer with the throaty roar of it's full sized counterpart.





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MotorConcept: Flat 12V - FERRARI 512TR
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