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JasonBaker
Samba Member
Joined: February 08, 2010
Posts: 1642
Location: Cleveland, TN
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 Posted: Tue Jan 04, 2011 1:00 am Post subject: Do they ICT's really need the balance tube? |
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| I have my carbs off right now and I was thinking about drilling and tapping the intakes for the balance tube. Or just ordering CB performance's intakes with the port already installed. The lazy ass in me just wants bolt them back on and leave it alone. Any thoughts... |
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MAYHEM
Samba Member
Joined: January 30, 2006
Posts: 1813
Location: Warm and sunny coastal CT
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| Posted: Tue Jan 04, 2011 8:42 am Post subject: |
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Definitely installed the balance tube. Required for dual singles.
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Greg
Model Citizen
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DarthWeber
Samba Member
Joined: November 24, 2007
Posts: 7542
Location: Whittier,CA
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| Posted: Tue Jan 04, 2011 10:22 am Post subject: |
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Yes!
Stay tuned for the resounding No! from those that don't run them.
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| Mitey62 wrote: |
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wompninja
Samba Member
Joined: July 06, 2008
Posts: 2163
Location: Salt Lake City
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| Posted: Tue Jan 04, 2011 10:25 am Post subject: |
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| Just drill'em, you'll be happy you did. ICT's are a pain to take on and off. |
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kangaboy
Samba Member
Joined: August 28, 2010
Posts: 1064
Location: St. Louis, Mo
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| Posted: Tue Jan 04, 2011 11:58 am Post subject: |
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| wompninja wrote: |
| ICT's are a pain to take on and off. |
Agreed!
I have the port higher in the throat so i use it to run my svda as well as balance tube. I just used a T...hope this is actually helping my set-up.
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| skills@eurocarsplus wrote: |
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DavidKvapil
Samba Member
Joined: July 14, 2009
Posts: 91
Location: Boise, ID
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| Posted: Tue Jan 04, 2011 12:27 pm Post subject: |
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Don't run the vacuum advance off that line, you will get full vacuum advance at idle that way as vacuum is high.
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JasonBaker
Samba Member
Joined: February 08, 2010
Posts: 1642
Location: Cleveland, TN
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| Posted: Tue Jan 04, 2011 12:35 pm Post subject: |
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| DavidKvapil wrote: |
| Don't run the vacuum advance off that line, you will get full vacuum advance at idle that way as vacuum is high. |
Should the vacum line be run from the port on the base of the carb? And would it only need the vacum from one carb? Possibly the Left side, just because it's closer? |
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DavidKvapil
Samba Member
Joined: July 14, 2009
Posts: 91
Location: Boise, ID
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| Posted: Tue Jan 04, 2011 12:47 pm Post subject: |
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Yes, just run the vacuum port from the left side carb, and use the port on the carb, that's what it is for.
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mharney
Samba Member
Joined: June 01, 2002
Posts: 8353
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| Posted: Tue Jan 04, 2011 4:35 pm Post subject: |
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| The balance tube is not necessary, but it sounds like I am outnumbered. |
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vdubyah73
Samba Member
Joined: July 05, 2003
Posts: 2541
Location: somewhere in Texas, my house has wheels
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| Posted: Tue Jan 04, 2011 6:16 pm Post subject: |
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doesn't the balance tube really only minimize the 2 cylinder idle issue that you get with dual single barrel carbs?
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mharney
Samba Member
Joined: June 01, 2002
Posts: 8353
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| Posted: Tue Jan 04, 2011 6:31 pm Post subject: |
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No it does a few other exciting things.
- makes you idle in progression unless you modify the carbs
- makes throttle response more soggy down where the balance tube affects things
- makes it easy to be out of adjustment and think you are not
- risks gas condensation in the tubes
- makes extra plumbing available for leaks. |
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BugMan114
Samba Member
Joined: March 22, 2007
Posts: 3744
Location: Ellenwood, GA
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| Posted: Tue Jan 04, 2011 8:29 pm Post subject: |
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I've never ran duals before, but everyone i've talked to who's ran duals, and installed a balence tube said that they definately make the motor run smoother. a buddy of mine installed one, and it definately smoothed it out.
My guess is that it will mask the fact that the carbs might not be jetted/ adjusted correctly. whatever the reason, it does seem to run better. I was always told to clamp off the tube before adjusting tho, ir it wil be impossible to adjust the carbs correctly. Again, i'm not sure of this as i've never ran duals personally, but an old VW mechanic friend of mine told me this. this is prolly one of those "1000 ways to do something" kind of deals.
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Why the hell do they call it a gland nut. its obviously a big fat bolt!!! |
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wompninja
Samba Member
Joined: July 06, 2008
Posts: 2163
Location: Salt Lake City
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| Posted: Wed Jan 05, 2011 9:40 am Post subject: |
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| ^This is exactly what you are supposed to do. |
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busman78
Samba Member
Joined: August 17, 2004
Posts: 4667
Location: Oklahoma City, OK
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| Posted: Wed Jan 05, 2011 1:25 pm Post subject: |
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| The one advantage to a equalizing tube with single duals is it allows for the use of a vacuum gauge, best way to precision tune unless you have a AFM. |
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andk5591
Samba Member
Joined: August 29, 2005
Posts: 16820
Location: State College, PA
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| Posted: Wed Jan 05, 2011 1:35 pm Post subject: |
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Don't know ICTs, but Kad (single barrels) kits come with them. That being said - I have Kads on 3 engines and until I learned how to really set up the carbs, I can see why people used them. BUT properly synched and adjusted Kads do NOT need a balance tube. Then only thing a little different is that my idle is closer to 1000 RPMS, but I like the responsiveness of the engine better.
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JasonBaker
Samba Member
Joined: February 08, 2010
Posts: 1642
Location: Cleveland, TN
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| Posted: Mon Jan 31, 2011 7:07 pm Post subject: |
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| I called Redline Weber and they were actually kinda helpful. They told me the ICT's don't really need the Balance Tube. And after Mharney mentioned the possible problems I got lazy and I put them back on without the balance tube. (Mark is from TN and his vote counts twice) It ran fine like always, But when I upgraded to the Digital Magnaspark Distributor it now needs a vacum. It came with plates to sandwich between the carb and intake, but they fit dual 2-barrels. So Damn, I took them off again. Okay, next question. Should I drill and tap two fittings or one? One for Balance tube and another for the distributor. Or drill one and just T the shit out of it. I don't think I want to T from the balance tube because of condensation and debris. But I dont want to tap the intake twice and cause it to create weak spots. Of course I would tap on opposite sides. Any takers?.... |
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andk5591
Samba Member
Joined: August 29, 2005
Posts: 16820
Location: State College, PA
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| Posted: Tue Feb 01, 2011 5:00 am Post subject: |
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OK - once again - I dont know ICTS, just Kads. The balance tube on a Kad is below the carb and will only pull manifold vac. This is NOT the signal you want for a vac advance.
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D-Dubya Manx clone 1914. Ex wifes car.
Rosie 65 bug - My mostly stock daily driver.
Woodie 69 VW woodie (Hot VWs 7/12).
"John's car" 64 VW woodie - The first ever
Maxine 61 Cal-look bug - Ex-wifes car.
66 bug project - Real patina & Suby conversion
There's more, but not keeping them... |
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VWporscheGT3
Samba Member
Joined: September 01, 2006
Posts: 2203
Location: Gardnerville, NV
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| Posted: Tue Feb 01, 2011 8:08 am Post subject: |
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i dont know if the bug world is different but on type 3s its absolutly necessary to run a balance tube between the manis on icts
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chrisflstf
Samba Member
Joined: February 10, 2004
Posts: 4235
Location: San Diego
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| Posted: Tue Feb 01, 2011 8:12 am Post subject: |
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| Quote: |
| on type 3s its absolutly necessary to run a balance tube |
What is your reasoning for this? |
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mharney
Samba Member
Joined: June 01, 2002
Posts: 8353
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| Posted: Tue Feb 01, 2011 8:55 am Post subject: |
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| Yeah, I'd like to know too. Why is that? |
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