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What's the most power you've been able to achieve?

OK, with piston halfway through stroke, Right Triangle components; Rod length is "Hypoteneuse". Crank center to Gudgeon pin center is one-half stroke and is "Opposite". Trigonometric function "Cosecant" of 17 degrees value is 3.42, but rod angle is measure through only half it's travel, so Rod/Stroke ratio of 1.71 is half that value, corresponding to 17 degree rod angle. Also, rod angle affected by offset plus/minus gudgeon/wrist pin bore. You know, Rod/Stroke ratio is a lot easier than rod angle! 1755538426643.gif
 
Rod Angle is a discussion of great debate. There have been some semi scientific tests to try and arrive at the magic number. I think the conclusions are run what you got.
There are some tricks that seem to get longer rod engines to run and shorter rod engines. The best running Rod angle I've ever seen is the one that had the most R&D put into heads, intake, cam and headers. Those Rod angles have always been impressive.
 
mummert said:
Rod Angle is a discussion of great debate. There have been some semi scientific tests to try and arrive at the magic number. I think the conclusions are run what you got.
There are some tricks that seem to get longer rod engines to run and shorter rod engines. The best running Rod angle I've ever seen is the one that had the most R&D put into heads, intake, cam and headers. Those Rod angles have always been impressive.
Click to expand...
Jere Stahl, of Stahl Engineering, (makers of custom camshaft profiles and Stahl Headers)......had a masterful command of the relationship of rod angle, stroke, port size, valve size, header primary tube size and length, (every thing!). Never saw his equal..... https://eastcoastdragtimeshalloffam...back-at-the-career-of-jere-total-tuned-stahl/
 
We've lost many of the Old School guys in the last decade. Its strange how much they knew and the things even they would overlook. The relevance of their knowledge in the fundamentals is timeless.
I had the pleasure of hanging around a well known industry icon for some years.
We have to learn what we can from them while they are around and keep learning when they are gone.
The old school guys had real skills in manual machining, welding, all around engineering. Tough to find today.
 
Shannon Boal said:
Yup, same thing, trig function thereof, um....hypoteneuse over opposite? Inverse.....cosecant? Dang, hard to remember that!
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Just came across another motor that states 15 degrees. Very compact, powerful. Dimensions are favorable to swap into an Alpine with say an Audi transmission and add a turbo or supercharger. Would be a reliable rocket for sure.
1756045004053.jpegThe VR6 engine is a rare configuration: it’s a compact V-engine that takes some attributes from an inline. The “V” in the VR6 name refers to “V-Motor” while the “R” refers to “Reihenmotor”, or inline-engine in German. Smash it all together and you get V-inline engine. But how can an engine be a V and inline at the same time, and why does it even exist?
 
Not that there's a lot left to discuss about rod angles, but I found this "Engine Masters" video about testing different rod ratio engines.


 
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