Thread: Displacement versus RPM
02-12-2012, 04:02 PM #1
- Join Date
- Feb 2012
Displacement versus RPM
I'm new to PWC's, so please help me understand... I keep reading on this and other PWC forums that "There's no replacement for displacement." But let's pretend we have two engines..
Engine "A" has a displacement of 1100cc and gets 180 hp at 11000 RPM
Engine "B" has a displacement of 1800cc and gets 180 hp at 7000
Ignoring and difference in weight, would one feel any different than the other? Is there something I'm missing?
02-12-2012, 04:10 PM #2
Yes there is a difference. Its call "Torque".
02-12-2012, 04:26 PM #3
jp is dead right. torque can turn a higher pitch prop and move you further through the water with every revolution. also don't think that the 1800cc engine is all that much heavier. as a example the yamaha is as light or lighter as a ski than most competitors with smaller engines. also that displacement is terribly underutilized. potential for greater speed and still maintain reliability is huge.
02-12-2012, 06:34 PM #4
- Join Date
- May 2006
180 hp is 180 hp it will make the same rpm,,,, now the real difference is in abilty. build both motors and of course the big motor will make more power.
http://www.mk5cortinaestate.co.uk/calculator3.php to see the difference.
02-12-2012, 06:49 PM #5
Here is a question. Take a 2.0L N/A motor that turns 9K and make 240HP and 170Ft,lbs, than take say a N/A Chevy 350 that turns 5.5K and makes 240HP and 300+Ft.lbs. Which has more power?
02-12-2012, 06:59 PM #6
02-12-2012, 09:33 PM #7
There is another saying as well "It's not always the size but the ingrediants".
02-13-2012, 04:53 AM #8
- Join Date
- Oct 2011
- Sunshine coast QLD
Cubes always win hands down
02-13-2012, 06:47 AM #9
02-13-2012, 06:56 AM #10
Users Browsing this Thread
There are currently 1 users browsing this thread. (0 members and 1 guests)
By lightspeed in forum 4-Tec PerformanceReplies: 8Last Post: 06-11-2010, 12:02 PM
By d0n in forum 2-Stroke PerformanceReplies: 2Last Post: 08-26-2008, 11:23 PM
By seaobin in forum Polaris Open DiscussionReplies: 2Last Post: 09-25-2007, 03:03 PM
By Ultra250XRider in forum Kawasaki PWC Performance (4-stroke)Replies: 9Last Post: 08-15-2007, 12:28 AM
By VX1 in forum 4-Tec PerformanceReplies: 6Last Post: 07-09-2007, 03:16 PM