March 12th, 2018, 02:20 PM | #1 |
All the news that's fit to excerpt
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[roadracingworld.com] - Riding the 2018 Kawasaki Ninja 400 at Sonoma
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March 26th, 2018, 08:37 AM | #2 |
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wow vary informative
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March 26th, 2018, 09:43 AM | #3 |
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If everything seems under control; you're just not going fast enough! Last futzed with by CC Cowboy; March 26th, 2018 at 03:14 PM. |
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March 26th, 2018, 12:10 PM | #4 |
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You need to read between the
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March 26th, 2018, 12:11 PM | #5 |
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March 26th, 2018, 03:22 PM | #6 |
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I can't believe Kawa has moved up to a 400. I bet they will start making 1000's and 1400's soon.
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March 26th, 2018, 04:01 PM | #7 |
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It's clearly a homage to the greatest bike ever made, the EX500 Ninja. Too bad they skimped on the engine size.
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March 26th, 2018, 06:27 PM | #8 | |
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Makes no sense:
Quote:
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March 27th, 2018, 04:38 AM | #9 | |
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Sure it makes sense. Cooling pistons by oil jet is quite common. A lighter piston needs it, because there isn't as much metal there to use as a heat sink. Flip that around: if you design the oil system to spray the underside of the pistons so as to cool them, then you can make lighter pistons. Therefore less reciprocating mass, therefore higher rpm and faster acceleration, etc.
From https://en.wikipedia.org/wiki/Intern...engine_cooling Quote:
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March 27th, 2018, 05:02 AM | #10 |
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No no no... that oil spray is for additional thrust upwards. It... uhhh... increases the speed of the compression stroke! yeahhh that's it.
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March 27th, 2018, 08:47 AM | #11 | |
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Quote:
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March 27th, 2018, 09:13 AM | #12 |
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Okay, so I know you're kidding but to be clear... spraying oil doesn't cut the weight of the pistons (duh). It allows the engineers to use lighter pistons in the first place by improving cooling.
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March 27th, 2018, 10:18 AM | #13 |
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Yeah, haven't been able to find a single forged lightweight piston for 250 engine that's lighter than stock that requires oil-squirting. JE, Wiseco are cast & machined with excess edges and heavier than stock. Wossner, Arias, Arrow or Mahle can get me desired piston, but at $1600-2500/pr...
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