Vulcan RPM Characteristics - Kawasaki Vulcan Forum : Vulcan Forums
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 17 (permalink) Old 11-24-2009, 09:14 AM Thread Starter
Top Contributor
 
Helek_52's Avatar
 
Join Date: Jun 2009
Location: San Tan Valley, AZ
Year/Make/Model: 2009 Kawasaki Vulcan 900 Custom
Displacement/CC's: 900
Color: Black
Gender: Male
Posts: 1,223
Garage
Vulcan RPM Characteristics

Bass brought up a point in the "spark plug removal" thread i wanted to get you guys' opinion on, namely the Vulcan not being a high revving engine.

I think we're selling the Vulcan a little short on it's abilities. We buy V-Twins because we like Harley's low rpm rumble that big two cylinders provide. Kawasaki tries to accomodate us by giving us a nice V-Twin, but their technology leans toward higher-rpm engines. So, the first thing we all do is alter the exhaust so we can hear the nice low notes better, and change the gearing to slow down the rpm to keep the note low at speed. So...

1. I think this is a lot higher revving engine than we give it credit for and,
2. I think Kawasaki is not quite in the boat with the American mindset of a low-rpm, high-torque desire in their V-Twins.

Whaddya think?

Keep the Shiny Side Up!
'09 900 Custom SE on the Darkside
"Not all those who wander are lost." J.R.R. Tolkien
Helek_52 is offline  
Sponsored Links
Advertisement
 
post #2 of 17 (permalink) Old 11-24-2009, 11:30 AM
Senior Member
 
oquirrhvulcan's Avatar
 
Join Date: Sep 2009
Location: Utah
Posts: 487
Without a tach I have no idea what the RPM's are even doing on this bike.

2009 Vulcan 900LT Red/Titanium


OEM Passenger boards
OEM Windshield Bag
OEM Engine Guard
Windshield Lowers
Phat II risers
Cobra Lightbar
Cobra Luggage Rack
Kury Triple Wammy
Mustang Seat and passenger backrest
oquirrhvulcan is offline  
post #3 of 17 (permalink) Old 11-24-2009, 11:42 AM
Top Contributor
 
Jimbo's Avatar
 
Join Date: Apr 2008
Location: NW Tennessee
Posts: 533
The rev limiter on the 900 is around 7200rpm. 70mph is about 4100rpms.

Real gun control is having the ability to hit your target.
To view links or images in signatures your post count must be 1 or greater. You currently have 0 posts.
Jimbo is offline  
 
post #4 of 17 (permalink) Old 11-24-2009, 11:48 AM
Senior Member
 
Join Date: Sep 2009
Posts: 147
I guess the low- or high-revving characteristics says little about the "credit" we should give to an engine, in my opinion. It just contributes to the character of the engine and the entire "spirit" of the bike overall.

Just consider this:

I quickly checked out the Peak Torque and Peak Power characteristics of our Vulcans compared to some other bikes that I (purely intuitively) considered high revving (namely the Ninja's). Here is what I found out:

MODEL / Peak Torque (rpm) / Peak Power (rpm)

VN900 / 3,500 / 5,700
ZX6R / 11,700 / 14,000
ZX10R / 8,700 / 12,500

See my point? Very revealing numbers, IMO. The torque and power output profiles of these engines are very different. I am sure we can probably find the actual curves plotted on a graph somewhere on the web. The Ninja's torque plot will be much steeper and peaks considerably higher (relative to its range) that the Vulcan's.

Indeed, these Ninja's are four-cylinders so not exactly comparable but I think that even strenghtens the argument as the general rule goes the more cylinders the lower the rpm.

What do you guys think?

'07 Vulcan 900 Custom, Candy Fire Red
'05 Suzuki DR-Z 400s
bass567 is offline  
post #5 of 17 (permalink) Old 11-24-2009, 12:22 PM
Senior Member
 
Shiloh's Avatar
 
Join Date: May 2009
Location: Katy Texas
Posts: 209
Quote:
Originally Posted by bass567 View Post
I guess the low- or high-revving characteristics says little about the "credit" we should give to an engine, in my opinion. It just contributes to the character of the engine and the entire "spirit" of the bike overall.

-----

Indeed, these Ninja's are four-cylinders so not exactly comparable but I think that even strenghtens the argument as the general rule goes the more cylinders the lower the rpm.

What do you guys think?
Didn't you mean, the more cyclinders, the higher the RPM?

A better comparison engine wise might be 900 Vulcan, and a similar sized twin such as the Triumph Bonneville/America series, IMHO. Redline is about 1000 RPM higher on my 865 CC Thruxton Twin, but it has the advantage of a lighter valve train since it is a double overhaed cam engine (no rocker arms), and the Vulcan is a single overhead cam design and requires rocker arms for valve activation.

The 900 really does a pretty darn good job RPM wise, just look at Harleys 883 Sporster!

09 Vulcan 900 Custom - Traveller
09 FZ 6 - Lakota
Shiloh is offline  
post #6 of 17 (permalink) Old 11-24-2009, 01:05 PM
Senior Member
 
Join Date: Sep 2009
Posts: 147
Quote:
Originally Posted by Shiloh View Post
Didn't you mean, the more cyclinders, the higher the RPM?
Actually it seems to be the rule the way I wrote: higher revs for smaller engines.

You can see for yourself -- if you like say the Toyotas, look at the torque and power peak rpms of say the 1.8L 4-cylinder Corolla and the 5.7L V-8 Sequoia. Or take the Aveo and the Suburban...

'07 Vulcan 900 Custom, Candy Fire Red
'05 Suzuki DR-Z 400s
bass567 is offline  
post #7 of 17 (permalink) Old 11-24-2009, 02:29 PM
Senior Member
 
Shiloh's Avatar
 
Join Date: May 2009
Location: Katy Texas
Posts: 209
Ah, I read your post as the more cylinders the lower the rpm.

09 Vulcan 900 Custom - Traveller
09 FZ 6 - Lakota
Shiloh is offline  
post #8 of 17 (permalink) Old 11-24-2009, 03:07 PM Thread Starter
Top Contributor
 
Helek_52's Avatar
 
Join Date: Jun 2009
Location: San Tan Valley, AZ
Year/Make/Model: 2009 Kawasaki Vulcan 900 Custom
Displacement/CC's: 900
Color: Black
Gender: Male
Posts: 1,223
Garage
Well, it looks like didn't know what the %[email protected]# i was talking about.

I'd agree that comparing the twins to the four cyl. crotch rockets isn't really a fair comparison. I was looking more to Harley and, after researching a bit, found i didn't know squat. Although getting info on the Harley is a little difficult, here's what i found:

.......Tq lb/[email protected]@RPM
900: [email protected]@6000
883: [email protected]@6000
1200:[email protected]@5200

I fully expected the RPM parameters of the 900 to come in a fair amount higher than the Harleys. There i go thinking again. Dang.
I'm still dropping the gear ratio of my 900 this winter though. I don't like searching for 6th gear

Keep the Shiny Side Up!
'09 900 Custom SE on the Darkside
"Not all those who wander are lost." J.R.R. Tolkien

Last edited by Helek_52; 11-24-2009 at 03:10 PM.
Helek_52 is offline  
post #9 of 17 (permalink) Old 11-24-2009, 04:33 PM
Top Contributor
 
Jimbo's Avatar
 
Join Date: Apr 2008
Location: NW Tennessee
Posts: 533
I'd be kind of surprised to find a stock 900 off the floor that would dyno at 53hp. When MC magazine used one for their long term ride, they got a whopping 43hp on the dyno. You could most likely get the 53 with pipes/intake/processor, but off the rack? I dunno about that.

Real gun control is having the ability to hit your target.
To view links or images in signatures your post count must be 1 or greater. You currently have 0 posts.
Jimbo is offline  
post #10 of 17 (permalink) Old 11-24-2009, 08:03 PM
Senior Member
 
Shiloh's Avatar
 
Join Date: May 2009
Location: Katy Texas
Posts: 209
To Muddy the water more.

Here is a copy of the Kawasaki MSO on my bike,

50.9 HP and no RPM or torque data.



The difference between the magazines and Kawasaki is probably in large part due to rear wheel power (magazines) and crankshaft power (Kawasaki).

50.9, oh well, I still think it is an absolutely great bike.

09 Vulcan 900 Custom - Traveller
09 FZ 6 - Lakota
Shiloh is offline  
Sponsored Links
Advertisement
 
Reply

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Beginning to see rough ride characteristics Silencer69 Vulcan 2000 8 09-10-2014 12:34 PM
Vulcan 750 crusing speed rpm wayland General Vulcan Talk 0 04-17-2011 06:01 PM
93' Vulcan 750 low RPM hesitation drumminsk8 Vulcan 750 2 11-17-2010 06:28 AM
93' Vulcan 750 low RPM hesitation drumminsk8 Engine Work 0 09-09-2010 03:30 PM
2007 Vulcan lifter knock at idle then stalls high rpm Laundry Vulcan 1600 0 08-04-2010 07:25 PM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome