If it\’s got an engine. . .

Dorri probably likes it

My thoughts on Bruce Crower’s six-stroke engine

Posted by ifitsgotanengine on March 18, 2006


If you don’t know what I’m talking about, read this first.

Briefly,
Four Stroke:

  • Piston moves down, drawing air and fuel into cylinder
  • Piston moves up, compressing air and fuel
  • Spark plug fires, causing mixture to explode, pushing piston down
  • Piston moves up, expelling exhaust gasses.
  • Cycle repeats

Six Stroke:

  • Piston moves down, drawing air and fuel into cylinder
  • Piston moves up, compressing air and fuel
  • Spark plug fires, causing mixture to explode, pushing piston down
  • Piston moves up, recompressing exhaust gasses
  • Water is squirted into cylinder, flashing to steam, pushing piston down
  • Piston moves up, expelling exhaust gasses and steam.
  • Cycle repeats

While I haven’t done any calculations as to the amount of energy that can be gained by utilizing exhaust heat in this manner, I am confident that it will result in greater efficiency gains than BMW’s method.

I also know just the engine to use as a test mule for this project. The Honda CVCC engine. The test engine needs (at least) three valves – fuel intake, water intake, and exhaust. Most three-valve engines operate both intake valves from the same camshaft lobe. Not the CVCC. It has three cam lobes for each cylinder – intake, aux intake, and exhaust. All that would be needed to convert this engine to six-stroke is a new camshaft and timing belt pulleys (to slow the cam down to 1/3 engine speed). The carburetor even has a separate section for the aux intake. I haven’t looked closely at it, but it shouldn’t be too difficult to convert it to atomize water in that venturi and fuel in the main venturi.

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One Response to “My thoughts on Bruce Crower’s six-stroke engine”

  1. Anonymous said

    Your Idea about the CVCC wont work. What you want to do Is take one of the new GM Turbo Direct Injections Ecotecs and add standard port fuel injection. Then use the Direct Injection jets to shoot the water. The water is “squirted into a compressed cylinder” this is not somthing you can open the valve to do.

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