Air Chamber Question - Kawasaki Vulcan Forum : Vulcan Forums
 1Likes
  • 1 Post By trainermb
 
LinkBack Thread Tools Display Modes
post #1 of 8 (permalink) Old 12-26-2017, 06:06 PM Thread Starter
Senior Member
 
texasgrape's Avatar
 
Join Date: Jan 2015
Location: A stone's throw from Luckenbach, TX
Year/Make/Model: 1996 Kawasaki Vulcan 800 Classic
Displacement/CC's: 800
Color: Blue-Green
Gender: Male
Posts: 330
Garage
Air Chamber Question

What change in performance would be experienced by running without the air chamber (air box) vs running with it? PO forgot to include it when I purchased the Classic 800. Although bike starts right up and idles, it seems very sluggish. Would running without the air chamber have anything to do with that? (PO is mailing the air chamber to me.) Thanks.
texasgrape is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old 12-27-2017, 09:23 AM
Top Contributor
 
btom's Avatar
 
Join Date: Mar 2016
Year/Make/Model: '05
Displacement/CC's: 800
Gender: Male
Posts: 1,138
Garage
stock backing plate, stock paper filter and chrome cover?

Thunder Mfg teardrop 40's K&N 170MJ 48PJ 2.75turns DynoJet Needle DNO106 2nd notch V&H Cruzers Aeromach risers Michelin Commander IIs Wix 51358 filter 17T/40 Sprockets, 2357 rear bulbs
btom is offline  
post #3 of 8 (permalink) Old 12-27-2017, 11:09 AM
Top Contributor
 
trainermb's Avatar
 
Join Date: Jul 2017
Location: Snohomish County, Washington State
Year/Make/Model: 2007 Kawasaki Vulcan 900 Classic LT
Displacement/CC's: 900
Color: Black & Silver
Gender: Male
Posts: 507
Garage
Quote:
Originally Posted by texasgrape View Post
What change in performance would be experienced by running without the air chamber (air box) vs running with it? PO forgot to include it when I purchased the Classic 800. Although bike starts right up and idles, it seems very sluggish. Would running without the air chamber have anything to do with that? (PO is mailing the air chamber to me.) Thanks.
Air boxes are designed to be resonant chambers.

Resonance is a state of minimum resistance to flow -- whether we're talking about air, water, sound waves, or even electricity. So by serving as a resonant chamber, the air box drastically reduces the resistance to air flow into the engine. Indeed, if everything's timed out right, it acts something like a (small ...) (very small ....) turbocharger, actually raising the air pressure at the intake at the moment the intake opens.

All that adds up to, yes, that missing air box could at least be contributing to sluggish performance.
texasgrape likes this.

"Don't force it. Get a bigger hammer."
- William Shakespeare
trainermb is offline  
 
post #4 of 8 (permalink) Old 12-27-2017, 06:30 PM Thread Starter
Senior Member
 
texasgrape's Avatar
 
Join Date: Jan 2015
Location: A stone's throw from Luckenbach, TX
Year/Make/Model: 1996 Kawasaki Vulcan 800 Classic
Displacement/CC's: 800
Color: Blue-Green
Gender: Male
Posts: 330
Garage
Quote:
Originally Posted by btom View Post
stock backing plate, stock paper filter and chrome cover?
Yes to all the above. Bike is stock, just no air chamber.
texasgrape is offline  
post #5 of 8 (permalink) Old 12-28-2017, 08:55 PM
Senior Member
 
Beans's Avatar
 
Join Date: Aug 2015
Location: North Vancouver
Year/Make/Model: 2005 Vulcan 800 Classic
Gender: Male
Posts: 101
Garage
I would give the carb a look over before you install the air chamber under the tank. The jets could have been changed, or the carb could need a good clean. Removing the tank and air chamber is like half way to having the carb off, so might as well do it now.

Never argue with a fool: onlookers may not be able to tell the difference.
Beans is offline  
post #6 of 8 (permalink) Old 12-29-2017, 08:47 AM
Top Contributor
 
btom's Avatar
 
Join Date: Mar 2016
Year/Make/Model: '05
Displacement/CC's: 800
Gender: Male
Posts: 1,138
Garage
after-market air boxes for the 800 are hard to find, and thunder mfg in AZ who sold 800 air boxes went out of business

Thunder Mfg teardrop 40's K&N 170MJ 48PJ 2.75turns DynoJet Needle DNO106 2nd notch V&H Cruzers Aeromach risers Michelin Commander IIs Wix 51358 filter 17T/40 Sprockets, 2357 rear bulbs
btom is offline  
post #7 of 8 (permalink) Old 12-29-2017, 12:30 PM Thread Starter
Senior Member
 
texasgrape's Avatar
 
Join Date: Jan 2015
Location: A stone's throw from Luckenbach, TX
Year/Make/Model: 1996 Kawasaki Vulcan 800 Classic
Displacement/CC's: 800
Color: Blue-Green
Gender: Male
Posts: 330
Garage
I pulled the carb when I adjusted the valves. Carb has correct jetting and is in great shape--gave a thorough cleaning. I rec'd the OEM airbox from PO today, will install it once I am feeling better. Have to change the oil too. (WAY WAY above sight glass. Hope it's all oil.)
texasgrape is offline  
post #8 of 8 (permalink) Old 12-31-2017, 12:17 PM
Top Contributor
 
btom's Avatar
 
Join Date: Mar 2016
Year/Make/Model: '05
Displacement/CC's: 800
Gender: Male
Posts: 1,138
Garage
when it comes to oil in the crankcase and you just got a used bike from previous owner, change out the oil because never assume what another person has done to your bike and when it was done, change it out anyways so that you will have your own record of what was done and when it was done

Thunder Mfg teardrop 40's K&N 170MJ 48PJ 2.75turns DynoJet Needle DNO106 2nd notch V&H Cruzers Aeromach risers Michelin Commander IIs Wix 51358 filter 17T/40 Sprockets, 2357 rear bulbs
btom 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
Gasoline in air chamber BgDddySUM Vulcan 500 5 04-19-2012 09:30 PM
1994 Vulcan 1500A Float Chamber needed bri4406 Bikes For Sale 0 09-13-2009 08:59 AM
gas in the air cut off chamber? pugetsoundsailer Vulcan 1500 0 05-31-2009 04:24 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