2-stroke will generally give you higher torque.
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2-stroke will generally give you higher torque.
cheaper to make
higher power to weight ratio
No requirement to have internal lubrication system
less moving parts
In racing circles, the 4 strokes are now able to produce more power than a 2 stroke for a given capacity. The problem with a 2-stroke is that even with expansion chambers they are still not an efficient motor. The other limitation is that 2-strokes is that they cant really make peak power happen beyond about 11,000 rpm, though they can make it linger well beyond that rather than falling off. 4-strokes they can make pull for as long as things remain in synch. I think F1 are hitting around 18,000rpm and I'm not sure what the bikes are doing these days.Quote:
Originally Posted by schmierer LR at singleton
2 stroke benefit - no o/h valves, simple power valve set up, no complicated head, no timing chain.
not always...
Ive seen 2 strokes with timing chains and over head valves.
Yep. diesel 2 strokes.
The petrol 2 stroke with rotary/disc valves can also have a timing belt when the intake is aligned with the gap in the crankshaft rather than the normal side entry.
Mazda rotarys are effectively a two stroke and had their capacity doubled (on paper) after their first year of racing to make the other cars competitive. Gricey cleaned up that year. You also have two stroke diesels like the twin knocker. You can even have 1 stroke steam engines and the Stirling engine
Deano
Quote:
Originally Posted by DeanoH
would that be a steam cannon?
Not necessarily - some two stroke diesels have overhead valves. Some two stroke diesels have no head cylinder head; e.g. Junkers style engines. Simplicity is not necessarily a feature of two strokes.Quote:
Originally Posted by CraigE
John
and i think the exhast on a 2 strok is alot more inportent then a 4 stroke, ;)