I was thinking about light and simple so 2 stroke came up.
If the intake charge is escaping out the exhaust
except
when the tuned expansion pipe is kicking it 'all' back;
how efficient would a constant and exact/optimal RPM, 2-stoke engine, turning a genset, be?
(We aren't discussing generator/alternator efficiency here)
Here's a nice read on the why and how of Tune-Pipes and some dyno graphs:
http://www.jawamania.info/Files/tech...ust_system.pdf
Here's emissions numbers of various engines doing the Euro Cycle. etc:
https://publications.jrc.ec.europa.e...%20%282%29.pdf
But no constant rpm with tuned expansion pipe research I could find yet.
Or
How efficient and clean is a 2-stroke with a variable Tune-Pipe?
Here's a study on a variable Tune-Pipe:
Improving the Performance of Two-stroke Motorcycle with
Tuned Adjustable Exhaust Pipe
https://maxwellsci.com/print/rjaset/(2)59-65.pdf
The tuned exhaust system was found to improve fuel economy of the engine by 12%.
The major engine-out emissions, HC and CO were reduced by a minimum of 27.8% and 10.7% respectively.
An improved power output of 15.8% increase was achieved.
As a bonus, it w as also found that the exhaust noise was reduced .
https://www.tiktok.com/@europeanpowe...60752034729248
I'll do more research on this but if you have a moment to look at the graphs etc in the linked study,
I would like the opinions of those who are more up to speed with the numbers in eco 4-strokes for HC, CO, etc plz so we can compare.
https://maxwellsci.com/print/rjaset/(2)59-65.pdf
Many of the papers also speak of cleaning up the exhaust.
I also have some ideas on cleaning up the exhaust.
