#21
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Why would you even pay for a lightened flywheel then..?
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#22
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Its the craaaacccckkkkkkk.
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#23
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How much you notice the difference depends on the power to weight ratio of the vehicle, it's gearing, and so on. For example. Let us say a mower flywheel weighs 5 lbs, and the engine internals weigh 15 lbs, totalling 20 lbs. If we shave off 1 lb off the flywheel, we now have 19 lbs, so 1/20, or a 5% difference. If we're smart and remove that weight from the outside edge of the flywheel, the gain is actually higher than 5% because weight towards the hub is less useful in a flywheel role than weight at the outside diameter. About 6-1/2% increase in acceleration/deceleration capability of the engine. That means your engine can go from 1000 RPM to 4000 RPM 6.5% faster in this example. But your kart won't accelerate 6.5% faster. With a 15 tooth sprocket on the engine and a 60 tooth sprocket on the axle, that's a 4:1 ratio so the live axle would have capability to accelerate and decelerate 1.625% faster than with the original flywheel on the engine, using the same made up example above. With a tiny engine that's not much of a difference. On a full size vehicle that produces 500 HP and has a 1:1 5th gear, that is a noticable difference. In auto racing that noticable difference might be a factor in winning and losing. This is why road racing cars (off-road rally cars, road course track cars, etc) often have short-stroke engines with button clutches. Less rotating mass far from the crankshaft centerline allows these engines to accelerate and decelerate quickly, which gives the driver more control of the car because he/she can shift through many gears keeping the RPMs up in the engine's peak HP range no matter what the speed. |
#24
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If you guys wouldnt mind using a vertical on a go kart is as simple as mount it, rotate the carb and add some extra oil.
Some of you might say bull but this is on for engines that use splash lub. Since the connecting rod on the crank move in a rotary motion at little extra oil for the connecting rod cap to splash in will actually create a fine mist as anderkart mentioned to me before. So it's not as hard to have a vertical on a kart just add some extra oil.
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"No one is going to open doors for you your whole life, sometimes you have to open the dor yourself." Eddy |
#25
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hey kaptain... can you post another link to the peerless 820? the link seems to be broken.
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#26
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after writing that i thought... why dont i just look it up lol.
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#27
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#28
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Interesting vid. Two quick points- 1) He tosses the camshaft onto the floor with a resounding smack. Ugh. 2) The hammering of the gas tank is somewhere I wouldn't go, either. Extend the intake manifold instead.
That said, this was a proof of concept and he obviously doesn't care about this engine... He didn't seem to have any trouble pull-starting it either, a topic that has come up with regards to vertical engine conversion (flywheel). Could that be because the compression is weak on that engine, or is it that the flywheel is heftier that some other verticals?
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Treat it as you would an aircraft frame and you should have no problems. -Name Withheld The Manual- "Just the manufacturer's opinion of how to put this together."- Tim "The Tool Man" Taylor Put down the wrench, and come out with your hands up!- Me! Wrench, Wheel, Wreck, Repeat... |
#29
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__________________
Those that can...do. Those that can't...buy a predator.
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#30
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I didn't watch the vid (56k internet) but If he does what I did then yeah, it's easy. You could do it in an afternoon.
When stating it, pull it as fast as you can, if you don't then it will bite you and not start. Thanks Hayden |
#31
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Hey sideways did yours work? i cant find your thread
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#32
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All well and good...
Let's see it mount/work on a kart. Anyone? Anyone at all?
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Those that can...do. Those that can't...buy a predator.
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#33
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Yeah, it ran fine, keeps on breaking pull starters though. The thread was "Briggs vertical to horizontal conversion" I think.
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Thanks Hayden |
#34
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#35
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also after you get driving the momentum of the kart will take the engine through its compression stroke
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#36
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Once it's running, it will be fine. Don't need the kart's momentum.
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Treat it as you would an aircraft frame and you should have no problems. -Name Withheld The Manual- "Just the manufacturer's opinion of how to put this together."- Tim "The Tool Man" Taylor Put down the wrench, and come out with your hands up!- Me! Wrench, Wheel, Wreck, Repeat... |
#37
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Only thing I have done regarding lighter flywheels is to raise idle speed slightly higher than what might be considered normal and/or richen the low speed mix. The latter is not possible on an emissions carb.
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Those that can...do. Those that can't...buy a predator.
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#38
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No, it's got a side starter, there's nothing to wrap a rope around. I'm making a kick starter for it anyway.
It runs fine once you start it, it didn't like idling but it didn't with the blades on either, the carby needed a new diaphragm, among other things. Thanks Hayden |
#39
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How about a vertical from a pressure washer? Those probably have heavier flywheels right? Or am I missing something else in the pressure washer that acts like a flywheel?
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#40
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I'm pretty sure you can fit the flywheel from a normal Briggs anyway. I don't find the flywheel thing an issue (apart from the mashed pull starters of course), you kart will accelerate slightly faster with a lighter flywheel anyway. If my pull starter was better designed and stronger it wouldn't be an issue. Thanks Hayden |
The Following User Says Thank You to sideways For This Useful Post: | ||
A.Baker (11-26-2013) |
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