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Old March 12th, 2018, 02:20 PM   #1
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[roadracingworld.com] - Riding the 2018 Kawasaki Ninja 400 at Sonoma

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Old March 26th, 2018, 08:37 AM   #2
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wow vary informative
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Old March 26th, 2018, 09:43 AM   #3
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Originally Posted by taz View Post
wow vary informative

Just try to keep up!
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Old March 26th, 2018, 12:10 PM   #4
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Old March 26th, 2018, 12:11 PM   #5
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OK - I think the bot probably meant to link to this video....

Link to original page on YouTube.

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Old 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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Old 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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Old March 26th, 2018, 06:27 PM   #8
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Makes no sense:

Quote:
"Engineers were able to cut the weight of the pistons by placing oil jets that spray the underside of each piston as it travels up and down."
Understandably, writer was probably rushing against deadline to make his $38 in profits while wrangling with his diarrhea kid.
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Old 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:
Only the fixed parts of the engine, such as the block and head, are cooled directly by the main coolant system. Moving parts such as the pistons, and to a lesser extent the crank and rods, must rely on the lubrication oil as a coolant, or to a very limited amount of conduction into the block and thence the main coolant. High performance engines frequently have additional oil, beyond the amount needed for lubrication, sprayed upwards onto the bottom of the piston just for extra cooling. Air-cooled motorcycles often rely heavily on oil-cooling in addition to air-cooling of the cylinder barrels.
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Old 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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Old March 27th, 2018, 08:47 AM   #11
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Quote:
Originally Posted by adouglas View Post
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
Yeah, I've always notched the con-rod to squirt oil under pistons. Just never used it as method to lighten a piston. I wonder what the 400 piston weighs... or what it's made of... cast? Forged? Hypereutectic?

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Old 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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Old 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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