4 ms·

Indeed. My old bike had 1400cc and was rated at only 94 hp.

by ksaj 3y ago

jacquesm 3y ago
'old' may have something to do with it here, engine tech has seen all kinds of improvements over the last two decades resulting in tiny engines with ridiculous levels of output while still having reasonable life span. A pretty common small car engine that has .9 L displacement and a turbo yields 105 HP, that's 120 HP/L, vs 67 HP/L for your bike. A few years ago I had a 660 CC 4 cylinder engine in a car that did 67 HP so that's about 100 HP/L. This engine is pretty clever, it avoids one nasty problem of swashplate drives and their cousins: the piston travel is only half here of what it would be otherwise. But there is a lot of extra complexity.
- windexh8er 3y ago
  We should probably call a spade a spade here. This is a 2-stroke motor. In today's powersports world it's normal for a factory 650cc motor to be putting out over 135HP. It's not impressive in terms of the performance to engine size and, as I mentioned in another comment, this engine will be extremely weak on the torque side of the equation which will make those ponies virtually useless.
  - jacquesm 3y ago
    That's fair, for a two stroke it isn't substantially better than what's out there. As for weak on the torque, for a generator that may not matter all that much. What I'm more curious about is the powerband, in other words how wide the RPM range is over which it produces max power. If that range is wide it might be a very useful engine (because you can simply couple it with an appropriate gearbox for torque), if it is very narrow then it really only will work well as a generator producing high frequency AC. That's one reason why specialty generator engines tend to run with very sharp cams on the camshafts: they only need to work in a very narrow RPM range and opening them earlier or later is just going to waste fuel so for maximum efficiency you want the valves to be open just long enough to take in enough air or to exhaust the expended fuel/air mixture. edit: apparently this engine also has a super charger, which isn't quite 'atmospheric'.
- brucethemoose2 3y ago
  The Ariel Atom V8 did ~160hp/liter in a 3L NA engine. I'm sure its pretty high strung, but its also older and more "conventional" than exotic supercar engines.
  - jacquesm 3y ago
    The Atom is an absolute beast.
dieselgate 3y ago
There are 1.9L/1900cc turbo diesel engines rated at 95hp - funny to think about

Indeed. My old bike had 1400cc and was rated at only 94 hp.

by ksaj 3y ago

Indeed. My old bike had 1400cc and was rated at only 94 hp.

'old' may have something to do with it here, engine tech has seen all kinds of improvements over the last two decades resulting in tiny engines with ridiculous levels of output while still having reasonable life span. A pretty common small car engine that has .9 L displacement and a turbo yields 105 HP, that's 120 HP/L, vs 67 HP/L for your bike. A few years ago I had a 660 CC 4 cylinder engine in a car that did 67 HP so that's about 100 HP/L. This engine is pretty clever, it avoids one nasty problem of swashplate drives and their cousins: the piston travel is only half here of what it would be otherwise. But there is a lot of extra complexity.

windexh8er 3y ago
We should probably call a spade a spade here. This is a 2-stroke motor. In today's powersports world it's normal for a factory 650cc motor to be putting out over 135HP. It's not impressive in terms of the performance to engine size and, as I mentioned in another comment, this engine will be extremely weak on the torque side of the equation which will make those ponies virtually useless.
- jacquesm 3y ago
  That's fair, for a two stroke it isn't substantially better than what's out there. As for weak on the torque, for a generator that may not matter all that much. What I'm more curious about is the powerband, in other words how wide the RPM range is over which it produces max power. If that range is wide it might be a very useful engine (because you can simply couple it with an appropriate gearbox for torque), if it is very narrow then it really only will work well as a generator producing high frequency AC. That's one reason why specialty generator engines tend to run with very sharp cams on the camshafts: they only need to work in a very narrow RPM range and opening them earlier or later is just going to waste fuel so for maximum efficiency you want the valves to be open just long enough to take in enough air or to exhaust the expended fuel/air mixture. edit: apparently this engine also has a super charger, which isn't quite 'atmospheric'.
brucethemoose2 3y ago
The Ariel Atom V8 did ~160hp/liter in a 3L NA engine. I'm sure its pretty high strung, but its also older and more "conventional" than exotic supercar engines.
- jacquesm 3y ago
  The Atom is an absolute beast.

dieselgate 3y ago

There are 1.9L/1900cc turbo diesel engines rated at 95hp - funny to think about