Ever cough up a fur ball? Think about it, that's a restriction.
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Specs on new Ninja H2 street released
- Thread starter Roadghost
- Start date
Ever cough up a fur ball? Think about it, that's a restriction.
Wow. for that, you can buy an RSV4, and all the go-faster track bits like and Akra and ohlins, and still have money left over to buy a cappuccino in Rome.
Actually, no.
Engine needs to breathe. Basic engineering.
Roomie
Banned
My words almost exactly to my friend this morning who's kawi's biggest fan. Took a supercharger to get there and now it weighs considerably more. Well done. Not. S1000rr all day over that big barrel of hideousness
The platinum pellets in catalytic converters actually work at red-hot conditions, they don't even work below 550F, and typically run into 800F.
You will not melt down until orange-yellow hot @ 1000F. You still only have 250cc per cylinder.
Yeah, then they want $27,500 for it. This is more than an HP4 with all the fast bits added.
What did all that cost, weight and complexity actually achieve?
I'm a huge Kawa fan, but this project lost the plot somewhere.
I'm thinking somewhere around 5 psi
Roomie
Banned
You would think that at that price they could have made it look half decent. All that just to say "look at me I have a supercharged bike" I'd take the zx10 over this all day too
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The exhaust temperature right after the exhaust ports would be well beyond that. With a normal engine, the heat dissipation from the primary header pipes is just enough to get the temperature within acceptable range before the catalyst (that's basically why the catalyst is a certain distance downstream of the engine - its location is not by accident). This one is not normal, there's 50% more mass flow through each cylinder ... The exhaust valves are Inconel, which ought to indicate how hot they expect them to run.
It is known that Rickey Gadson has his hands on one ...
Hmmm, atmosphere is 15psi.....another 5psi is getting up there. That would produce good power, I'm thinking comically low would be measured in inches wc.
kwtoxman
Well-known member
Wrong.
I bet a leaf blower plumbed into the airbox wouldn't give 10hp. That's seat of the pants engineering tho.
kwtoxman
Well-known member
Motorcycle ram air works (some better than others) and its effects have been tested and reported; this has been known for a long time.
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No doubt it works. We are at the quantify stage. I say not 10hp. Of course I could be. Wrong.
I'm actually directly quoting from Kevin Cameron ' s Sportbike Performance Handbook, which has a sub chapter dedicated to the myths of "ram" air.
It's only about getting cooler air, not air pressure. That's why modern F1 cars still have the air scoops despite turbocharging.
For bikes, there is a pressure effect at well over 150 mph, but even then it's not 10hp.
Ruff numbers, at 300 km/h the "velocity pressure" - the pressure that is achieved if an airstream of that velocity is brought to rest without losses - is around 4 kPa, 4% of atmospheric pressure (which is 101 kPa under standard conditions). Higher intake pressure in addition to just filling the cylinders with that pressure, also tends to purge the cylinder better during the valve overlap period. For a 200 hp engine to become 210 hp with ram air (assuming at top speed of ~ 300 km/h) is about right.
This is assuming that the ram air system is well designed, because not all of them are. Kawasaki has been doing ram air for a long time, and they generally get this right.
This is assuming that the ram air system is well designed, because not all of them are. Kawasaki has been doing ram air for a long time, and they generally get this right.
kwtoxman
Well-known member
Talk about an old out-of-date reference.
How about some actual testing and data done more recently for everyone. Google works y'all know.
Older test
http://www.sportrider.com/ram-air-whats-it-worth
Newer test (first page is linked at the bottom)
http://www.sportrider.com/ram-air-test-part-deux/?image=5
You know perfectly well I meant 5 psi above atmospheric pressure... I can't be upset because you've been on a roll lately and I've joined your fan club
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