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We might also consider that dynamic forces will act upon actual compression ratio, drawing it down just prior to the instant ignition is required. The compressed air's molecular volume being reduced from the cooling effects of metals enclosing the combustion space and the cooler fuel being...

That would be a tiny injection orifice, but how would it ever close? Maybe he just relied on whatever supplied fuel pressure to control fuel flow? I wonder how much difference there is in power and efficiency between a true compression ignition diesel model engine when running on an alternative...

May I ask, as the injectors ports in modern, full-size diesels are small enough to atomize very well, then would a small, model true diesel engine require even smaller orifices and perhaps higher injection pressures to atomize to a proportionately smaller fuel particulate size? Can the fuel be...

Let me ask, does the small, model diesel engine's diminished mass cause a common inability to create and maintain enough heat within the combustion space to begin the compression ignition process, requiring all true diesel compression ignition model engines to use alternative fuels? Would using...

That boat engine sounds like an old john deere! I appreciate the GM 71 series of two cycle diesels. Perhaps like you, I have followed them on youtube and followed the difficulties encountered when trying to build small scale models of true functioning diesels on this site and think about ways...

Some of the early, single barrel Solex carburetors had a removable venturi. Early drag racers removed the venturi, leaving the straight bore without a venturi. As they didn't care about anything except wide open performance and maximum cfm flow rate. It was an acceptable loss of the normally...

Please allow me to try and share how I try to visualize the process for the sake of extended discussion: From within the cylinder, as the piston begins traveling away from cylinder head and increasing the cylinders volume, and reducing pressure within the cylinder. And, with the now open...

Yes, of course, and today all ECU's are much more difficult to crack into and edit but the aftermarket tuning companies have become able sell switchable map tuning systems that can be uploaded thru the diagnostic port and returned to the stock maps for emissions testing or a visit to the dealer...

I had motorcycles too, but never used anything on them other than stock or a very similar replacements. I wanted to try putting 4 motorcycle cv carbs on a cars 4 cylinder but never got that far. I am thoroughly impressed with the amount of power current automotive engines can produce... and...

Impressive indeed! Was that the Bosch D Jetronic system in use? VW first released the Bosch D Jetronic on the 1968 VW type 3 models with a center mounted throttle body and individual runners going to each cylinder. It was the world's first computerized, electronic fuel injection system with some...

I used to rebuild and modify the air-cooled engines. I have the case align boring tool still. Nearly all machining can be done in a bridgeport mill since the engines are so modular. I learned about some carb issues on the air-cooled engines. The single, center mounted PICT carbs required...

In the early 80's the world was evolving into fuel injection. My 1983 VW GTI had a mechanical air flow meter before the throttle body that worked fine with the stock cam but when a cam with more overlap was installed the more erratic pulses from the cam change caused the flow meters plate to...

Initially considering a 4 stroke configuration, one would consider the operational RPM range, and a cam design that did not seek to generate higher percentage of cylinder filling from valve overlap impulse tuning, a single cylinder's swept volume would need to be filled with mixture thru a given...

I had read once that the early rotary's thin, light cylinders were machined down from around 2000lbs of billet steel, as they didn't have spin casting technology at that time. I wonder if a rotary would have a mild supercharging effect from the spinning assembly, the mixture within the intake...

Maybe you could design an improved / beneficial component for an existing powerplant, something that improves its functionality, performance or durability?

Would that then satisfy the odd number of cylinders theory? Was that a harmonic issue? What number of cylinders per bank were the wasp engines?

I believe production commercial and precision gears would likely be cut with a Hob instead of a profile cutter. The Hob gear cutter is in the shape of a rack and generates the tooth profile as the hob is synchronized to rotate with the pitch of the rotating gear and would likely begin...

Several years ago, before I retired, I had a similar experience. I saw these on Amazon and gave them a try. They held up better and were stiffer. They had the pivotable ball type on the long end. I didn't like the case as the fractional size was too small and difficult to read. Not aware of them...

Perhaps you could calculate or scale the pressures that will be exerted on surfaces that will contact the rollers and if the hardness is adequate, maybe around 60 rockwell C, to avoid deformation?

Precision should always be considered as how much is necessary, and why. Functionality is the ultimate judge! I have watched mold making in this country migrate offshore since the 80's due to cost benefit. Medical mold making remains relatively strong due to liability issues. As one becomes...