This guy has way too much time on his hands.
Building a 4 cylinder engine with all pistons moving up and down all at the same time.
- Thread starter atikovi
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1) Dyno test or it didn't happen.
2) A waste of a perfectly good Lada.
3) The VD's take a beating with this setup.
Anybody else?
2) A waste of a perfectly good Lada.
3) The VD's take a beating with this setup.
Anybody else?
Four cylinder engines are known to have some minor vibration issues.
Some hydraulic motor mounts would take care of that.
OVERKILL
$100 Site Donor 2021
Well, I'm skeptical already given that they call it a "1-stroke", which is just wrong.
The 4-stroke designation has nothing to do with the number of cylinders, it's the four strokes the engine makes in order to complete a cycle, which are:
1. Intake
2. Compression
3. Power
4. Exhaust
A 2-stroke combines intake/compression and power/exhaust.
There have been a couple of motorcycle engines that were 2 cylinder where both pistons moved together. They made more torque but had some pretty strong vibration and were obviously more RPM limited than their alternating cylinder siblings.
Four pistons all moving together is very similar to single cylinder engine (only with more complication). We have single cylinder engines (lawn mowers) and had bigger ones in the past too (stationary engines about 100 years ago). They don't rev all that well.
What's old is new again.
What's old is new again.
He just made one big Briggs & Stratton. 
It sounds like a Charlie Averson.
...perfect for a Harley...He just made one big Briggs & Stratton.
2 cylinder 4stroke outboards are this....both slugs move together. I think most inline 2 cylinder 4 strokes are like this. Also the BSA 2 cylinder motorcycle was this also.
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OVERKILL
$100 Site Donor 2021
Think the one I had apart was a Yamaha? This was 1996 so my memory is a bit spotty, lol. But it was a 2-cylinder in-line bike engine and I was told it was reasonably common.
A one stroke engine is impossible. Pistons go down and stay there? If they come back up, it's more than 1 stroke.
Two stroke is the minimum
Two stroke is the minimum
OVERKILL
$100 Site Donor 2021
Exactly.
Maybe you could call a turbine a 1 stroke. 
A ramjet or pulsejet, yes. A turbojet/turbofan/turboprop has “stages”.Maybe you could call a turbine a 1 stroke.
Most British parallel twin cylinder motorcycles had both pistons going up and down together. It was trade off which gave equal firing impulses 360 degrees apart but the poor primary balance of a single. Typical Japanese twins had one piston going up while the other went down giving perfect primary balance but uneven firing impulses at 180 degrees and 540 degrees. Best of both worlds is a boxer flat twin with both pistons going in an out at the same time which achieves equal firing impulses and perfect primary balance.
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