Do you know what four stroke means?

[HD Adam]

MissChief said:

I knew that a two stroke engine 'mixed' the exhaust and induction phases but I've never seen a cut away plan like that. Are all two stroke pistons shaped like that as opposed to the (relatively) flat-topped 4 stroke pistons?

4 stroke pistons are not necessarily flat tops. It all depends on the shape of the combustion chamber, compression ratio and what you are trying to do.

For example

426 Hemi

[Wacky Racer]

No, the Pistons come in all shapes and sizes....

www.google.co.uk/search?q=two+stroke+cycle&sou...

[Coldfuse]

This is pretty interesting stuff, i knew the basics of a 4 stroke engine. But i had no idea about a 2 stroke.

Every day is a school day

[Pistom]

I don't know what I don't know. If I landed back on earth in a Planet of the Apes situation, I'm not sure if I could get as far as making an ICE but a steam engine might just about be possible if I could overcome the metallurgical challenges.

I know I struggle to understand the benefits of certain engine types like the wker and the deltic although considering the rotary motion of the wker, you would imagine that it was a woman who came up with the idea. A male wker would involve reciprocating motion.

Deltic engines just seem to involve too many people and looks bloody perverted to me!

[airbrakes]

If anyone is really interested, I'll dig out my thermodynamics notes that explain the 4 stroke cycle in excruciating detail.....


Anyway, 4 stroke is old hat. Anyone heard of the 6 stroke cycle?
http://www.ridelust.com/crower-six-stroke/

Edited by airbrakes on Thursday 24th October 01:11

[Colonial]

Airbrakes nick name right?

[airbrakes]

come again?

[Colonial]

airbrakes said:

come again?

That's what she said.

[airbrakes]

Colonial said:

airbrakes said:

come again?

That's what she said.

My sides are splitting. Have you thought of a career in stand-up comedy?

[Evoluzione]

SturdyHSV said:

Wacky Racer said:

Four stroke cycle

I know you didn't make the diagram, but it's not really an explosion, but combustion.

Correct, it's a controlled burn. If it becomes uncontrolled or explodes that's when things get damaged or melt.
Also there is not very much 'Piston pushes out gasses' going on in a working engine.

If anyone wonders what the actual cycle looks like in action there is a clip on Youtube:
http://www.youtube.com/watch?v=UvmBLqjaZxY
Sadly the last few frames are missing, but most of it is there.

[wildcat45]

The only one to choose 4. I am in a minority of one!

[Monty Python]

Strictly speaking, combustion isn't a "stroke", it's an event. It should by induction - compression - expansion - exhaust.

[KFC]

I don't have a clue what it means.

[Nedzilla]

poing said:

Fort Jefferson said:

poing said:

I went for no idea.

It's probably something to do with sex.

Yes, it's a term used by women, to discribe men who come too quickly.

As in "he's a four stroke"

Explains why I had no idea

Why,.........are you a two stroke?

[Evoluzione]

Nedzilla said:

poing said:

Fort Jefferson said:

poing said:

I went for no idea.

It's probably something to do with sex.

Yes, it's a term used by women, to discribe men who come too quickly.

As in "he's a four stroke"

Explains why I had no idea

Why,.........are you a two stroke?

No he's a little wankel.

[Stu R]

airbrakes said:

If anyone is really interested, I'll dig out my thermodynamics notes that explain the 4 stroke cycle in excruciating detail.....


Anyway, 4 stroke is old hat. Anyone heard of the 6 stroke cycle?
http://www.ridelust.com/crower-six-stroke/

Edited by airbrakes on Thursday 24th October 01:11

Museum of bath at work has / had a six stroke griffin. Only known surviving one too if memory serves. Worth a visit if they've still got it.

[GadgeS3C]

BMW3s6 said:

Some willy waiving going on in here

How so?

This is PH, I'd expect a significant proportion of PHers to at least know the basics of how engines work.

[Evoluzione]

So come on then Tech-heads, nerds, geeks and Professors of combustion engine technology, if there is no 'bang' or explosion in the combustion chamber then why are engine exhausts so noisy?
If you run one without an exhaust pipe it does sound like small explosions, bangs and cracks etc coming from the exhaust port. I have my own theory, but over to you....

Edited by Evoluzione on Thursday 24th October 08:29

[PugwasHDJ80]

airbrakes said:

If anyone is really interested, I'll dig out my thermodynamics notes that explain the 4 stroke cycle in excruciating detail.....


Anyway, 4 stroke is old hat. Anyone heard of the 6 stroke cycle?
http://www.ridelust.com/crower-six-stroke/

Edited by airbrakes on Thursday 24th October 01:11

love this- six stroke sounds like a superb idea to me- bet it keeps the engine clean!

What always interested me was the difference between the calorific content of the fuel (one a per litre basis) against the flame propogation of the fuel- It took me ages to get my head round that Diesel actually had a higeh calorific content than petrol.

[Mashedpotatoes]

Direct ingection two strokes get my juices flowing