Technical Discussion Topics related to Technical Issues

Carb synch backwards?

Thread Tools
 
Search this Thread
 
Old 06-10-2010 | 04:46 PM
  #1  
dshakes's Avatar
Thread Starter
Senior Member
Superstock
 
Joined: Apr 2009
Posts: 395
From: Columbus, OH
dshakes is on a distinguished road
Carb synch backwards?

When you are synching the carbs and you open the throttle shouldnt the oil in the tubes rise? Like it will be sucked into the engine? Once i have the tubes on and the bike running if i open the throttle or even blip it hard the oil in the tube goes down toward the floor. Like the motor is pushing air out instead of a vacuum in. Do i just need a lesson in physics or is something wrong?
Old 06-10-2010 | 04:53 PM
  #2  
lazn's Avatar
Senior Member
MotoGP
 
Joined: Mar 2007
Posts: 3,132
From: Phoenix, AZ
lazn is on a distinguished road
There is more vacuum at idle than at full throttle. I forget the exact physics of it, but manifold vacuum decreases as RPMs increase.
Old 06-10-2010 | 05:00 PM
  #3  
peterpanic's Avatar
pragmatic anarchist
Superstock
 
Joined: Mar 2008
Posts: 380
From: Philadelphia, PA
peterpanic is on a distinguished road
yeah, like how my old schoolbus vac wipers went real fast at slow speeds and then slowed down to a stop as the nut drove through the downpour WAYYYY too damn fast!
Old 06-10-2010 | 06:07 PM
  #4  
alwayshonda's Avatar
Member
Squid
 
Joined: Mar 2010
Posts: 86
From: Detroit, MI
alwayshonda is on a distinguished road
It's like sucking on a straw with your finger over the opposite end. Your finger is the throttle plate, the straw the intake manifold, and you are the draw from the pistons. The more you remove your finger, the easier it is to draw in air, and the lower the vacuum is within the straw.
Old 06-11-2010 | 03:47 AM
  #5  
dshakes's Avatar
Thread Starter
Senior Member
Superstock
 
Joined: Apr 2009
Posts: 395
From: Columbus, OH
dshakes is on a distinguished road
Gotcha.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
uchi
General Discussion
43
09-14-2010 09:07 AM
viperkillertt
Technical Discussion
28
09-23-2008 08:37 PM
smack doogle
Technical Discussion
14
07-29-2008 09:18 AM
Shawn Torpey
Technical Discussion
0
02-12-2007 05:31 PM
shayne
General Discussion
7
08-01-2006 03:15 PM




All times are GMT -7. The time now is 04:41 AM.


Top

© 2024 MH Sub I, LLC dba Internet Brands



When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.