Four stroke fuel

August 27, 2017

Four-stroke fuel Bicycle

I have to both agree and disagree with your statements in the question and the article.

The higher fuel consumption of a two stroke engine is mostly due to the fact that it has a power stroke per revolution of the crankshaft.

I however have to disagree with the article stating that the fuel delivery plays a major role in fuel efficiency of older 2-Stroke engines.

I support my statements by taking the example of fuel efficiency difference between a carbureted 2 stroke & a carb 4 stroke engine. Not even considering EFI when both are carbs the 4 stroke still out performs the 2 stroke by significant amount.

  • A Yamaha 125cc 2stroke engine gives around 70mpg
  • A honda 125cc 4stroke engine gives around 153mpg

Now obviously EFI may it be Direct injection or port injection will improve the efficiency and exhaust of any engine regardless of it being a 2 stroke or 4 stroke.

The E-TEC technology shown in the video is mearly a GDI on a two stroke engine, it will increase the efficiency but will it be equal to a GDI 4 stroke engine of the same capacity? I highly doubt it, for example

  • The EFI version of the above 125 cc honda engine gives around 166mpg

Meaning if the 2 stroke suzuki engine with GDI can produce more than double the F.E then I agree with the concept but with my knowledge of how GDI works I am not certain of it.

How To Mix 2 Stroke Fuel
How To Mix 2 Stroke Fuel
Mercury Outboard Four Stroke running after High Pressure
Mercury Outboard Four Stroke running after High Pressure ...
HP 21 VT four stroke test run.
HP 21 VT four stroke test run.

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