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> Throttle Balancing, any secret methods?
fatdarryl
post 29th April 2009 13:55
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I am finding that my 1.7 boxer idles a little .. um wobbly. Its not rough just bit more vibration than there should be i think. I know the engine mounts can be troublesome, but wonderted if anyone has a methodical way of balancing the idle throttles to make sure each bank is fueled equally. Just a case of creeping it up until its at its smoothest? also would i necessarily have to rebalance the bypass air at the same time?
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airmike
post 29th April 2009 20:11
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Try cleaning your throttle bodies with carb cleaner or propanol wink.gif
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Mielle145_170...
post 7th May 2009 14:00
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Hi, well I synchronised my boxer yesterday and I can tell its running a lot smoother then before smile.gif
I used a set of vacuum meters, I bought them a year or two ago.



This post has been edited by Mielle145_1700_16V: 7th May 2009 14:02


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taz146
post 8th May 2009 18:03
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Mielle could you provide us more details about ur measurements?


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Mielle145_170...
post 12th May 2009 06:21
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As requested here a simple write-up for balancing your individual throttle bodies. smile.gif



The idear is that al four of your throttle bodies need to work in synch, if not the engine will not run smooth.

- First remove your intake manifold so you can see your throttle valves.

- Check that al valves are closed, if not then adjust the little "stop" on the back side of the
body.

- Now open the valves a little bit by pulling on the accelerator cable. Al four of the valves should open evenly, if one side is a little further open then
adjust this. This can be tuned by adjusting the plastic connectors running from the central rod to the body.

- After adjusting the valves you should synch the idle air bypass, this will smooth out your idle.
Get a mercury column or four idle valves like shown in the picture.
Open the four copper pipes on the outside of the bodies and connect your vacuum measuring device.

- Now, start your engine and check if al the four bypass channels create a even vacuum.
If this is not the case then adjust each valve by adjusting the screw.



Try this by idle and something like 2000RPM, if the vacuum is even then your throttle bodies are synched. coolio.gif

This post has been edited by Mielle145_1700_16V: 12th May 2009 06:24


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taz146
post 12th May 2009 15:55
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When ur saying an even vaccum u mean that the measurements for each of the channels should be the same?Is there a standard scale that has to be used?

Thx for the info:)


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Mielle145_170...
post 15th May 2009 10:17
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Check, I just found a old picture of my vacuum gauge thingy biggrin.gif



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taz146
post 16th May 2009 12:56
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worshippy.gif


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fatdarryl
post 27th May 2009 23:46
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Thanks so much, I have a feeling we will all have loveley smooth running boxers now!
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67duetto
post 28th May 2009 06:22
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This is what I use for the carbs on my Duetto.
http://www.carbtune.com/
smile.gif
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fatdarryl
post 2nd June 2009 20:34
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cool.. looks good Duetto, might be worth shellin out for, looks like one of those tools you'll use once in a blue moon, but couldn't live without!
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buellboy
post 2nd June 2009 21:01
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One of my family's friend is a 75yr old mechanic (still working!!!). He used to specialise in Italian cars (Franco Motors LTD!) but has stopped working on anything but fiat 126 bis for the past 8 years.

Anyhooo in his ancient tool collection (all his tools are at least 20years old) he has an original Alfa Romeo throttle balancer gauges that must be from the 60's 70's ....very cool machine!

Will post a picture next time i'm round his workshop!


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