Technical Discussion Topics related to Technical Issues

Carb synch backwards?

Old 06-10-2010, 03:46 PM
  #1  
Senior Member
Superstock
Thread Starter
 
dshakes's Avatar
 
Join Date: Apr 2009
Location: Columbus, OH
Posts: 395
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?
dshakes is offline  
Old 06-10-2010, 03:53 PM
  #2  
Senior Member
MotoGP
 
lazn's Avatar
 
Join Date: Mar 2007
Location: Phoenix, AZ
Posts: 3,132
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.
lazn is offline  
Old 06-10-2010, 04:00 PM
  #3  
pragmatic anarchist
Superstock
 
peterpanic's Avatar
 
Join Date: Mar 2008
Location: Philadelphia, PA
Posts: 380
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!
peterpanic is offline  
Old 06-10-2010, 05:07 PM
  #4  
Member
Squid
 
alwayshonda's Avatar
 
Join Date: Mar 2010
Location: Detroit, MI
Posts: 86
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.
alwayshonda is offline  
Old 06-11-2010, 02:47 AM
  #5  
Senior Member
Superstock
Thread Starter
 
dshakes's Avatar
 
Join Date: Apr 2009
Location: Columbus, OH
Posts: 395
dshakes is on a distinguished road
Gotcha.
dshakes is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
uchi
General Discussion
43
09-14-2010 08:07 AM
viperkillertt
Technical Discussion
28
09-23-2008 07:37 PM
smack doogle
Technical Discussion
14
07-29-2008 08:18 AM
Shawn Torpey
Technical Discussion
0
02-12-2007 04:31 PM
shayne
General Discussion
7
08-01-2006 02:15 PM


Thread Tools
Search this Thread
Quick Reply: Carb synch backwards?


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.

All times are GMT -7. The time now is 07:45 PM.


© 2019 MH Sub I, LLC dba Internet Brands