Following on from the thread about the wisdom or otherwise of exceeding revving an engine beyond the marked red line.........................
What is the highest revving reciprocating engine ever made? I remember hearing about some 2-stroke single-cylinder racing bikes that revved to 20,000 rpm.
What about diesels? I know that diesels cannot rev much beyond 5500-6000 rpm whatever their design because that speed matches the natural expansion rate of the burning diesel / air mixture in the cylinders.
Edited by Sofa Spud on 23/03/2009 at 10:47
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For road use, I suspect it's the current Yamaha R6 which revs to 17,500 RPM.
I have a radio controlled car powered by a two stroke, nitromethane fuelled single cylinder glow engine which revs to 39,000 RPM! Peak power however is at a sedate 35,000 RPM! :-)
Edited by DP on 23/03/2009 at 10:54
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sq
.....That probably answers my question!!!!
Edited by Pugugly on 23/03/2009 at 11:02
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>> I have a radio controlled car powered by a two stroke nitromethane fuelled single cylinder >> glow engine which revs to 39 000 RPM! Peak power however is at a sedate >> 35 000 RPM! :-)
Has it got a rev counter?
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Has it got a rev counter?
No, I'm only going by the manufacturers specs. Which are:
Size: 4.6cc (.28cubic inch)
Horsepower @ RPM: 2.9 @ 35,000
Maximum RPM: 39,000
Bore: 18.6mm
Stroke: 16.9mm
Construction: ABC
Heatsink Head: Purple Anodized Machined Aluminum
Carburetor: 8.5mm Composite Slide Carb
Carb Adjustments: 3 Needle, Flush Settings
Case: Silver Aluminum, Rear Exhaust
Connecting Rod: Dual Bushing
Sleeve: 8 port
Starting system: Pullstarter
More information here:
www.hpieurope.com/piw.php?partNo=15201
:-)
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Looks like a ferocious machine, hope it comes with earplugs.
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In the 1960s, Honda's GP bikes in the smaller classes had astronomical rev limits.
Their 125cc 5-cylinder racer revved to 21,000, and the short-stroke version of the legendary 250cc six-cylinder machine had a factory rev limit of 19,000. However, Mike Hailwood used to rev his to 21,000 on occasion :)
Here's the 250-6 at around 16,000 rpm: www.youtube.com/watch?v=vdDb7t2gCa0&feature=related
Edited to add that Honda's ill-fated 500cc 4-stroke racer from the late 70s / early 80s (oval-pistoned V4 with 8 valves per cyinder, 2 conrods / piston etc -- effectively a V8 that shared pairs of cylinders) revved to 23,000 in its final incarnation.
Edited by craig-pd130 on 23/03/2009 at 11:51
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I think the Rover gas turbine takes the all-comers prize - 60,000 rpm is reported:
www.4wdonline.com/Rover/GasTurbines.html
Edited by oldnotbold on 23/03/2009 at 12:03
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Some Ducati motor cycle engines, with desmodromic valves, could be revved to 22,000 rpm when used for braking, 18,000 when producing power. In a desmodromic system there are no springs and the valve is opened AND closed by a mechanical system which means there can be no valve spring 'bounce' and it is physically impossible for a valve to touch a piston crown. I wouldn't be to happy with anything turning at that speed a few inches below my sitting area!
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Horsepower @ RPM: 2.9 @ 35,000
I make that 630hp/litre - no wonder it goes so fast! Mind you, I expect the purple anodising helps - that and the nitromethane...
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