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 Air Screw adjustment

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BlackFly
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PostSubject: Air Screw adjustment   Sun Mar 25, 2012 5:57 pm

I made a new version of my little Pictorial because of i was unable to post the pdf version here (it was 800kB big)

Pictorial - Air Screw Adjustment
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dwoodul
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PostSubject: Re: Air Screw adjustment   Fri Aug 22, 2014 10:02 pm

Thanks for the instructions. Very easy to understand.
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saninpwnzor
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PostSubject: Re: Air Screw adjustment   Tue Apr 28, 2015 9:31 pm

Thanks for the instructions.i have now problem with this.
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PostSubject: Re: Air Screw adjustment   Wed Apr 29, 2015 4:19 pm

Awesome presentation, thanks!
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saninpwnzor
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PostSubject: Re: Air Screw adjustment   Thu May 14, 2015 5:34 pm

hello
because I can not find any of these instruments and to do a fine job, I'm interested in whether some can be by the number of revolutions of the screw do business
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Cosmic_Jumper
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PostSubject: Re: Air Screw adjustment   Thu May 14, 2015 9:12 pm

Here is a link to a DIY Manometer that can be used to adjust your air screws. http://www.thecubestudio.com/CrossfireHomeBuiltManometer.htm

Click on all the links in the article first because at least one of them has a good view of how the finished device should look. Based on that view it should be much easier to figure out the preceeding steps.

If it isn't mentioned in the text the finished manometer should be in the vertical position when in use. The longer you make the "U" the less apt you'll be to suck the fluid into the intake system. I used brake fluid in the device I made and my device was 1 meter tall with 1 additional meter of tubing extending on each side to reach the vacuum lines on the intake system.

Also, some of the words in that article is in "colloquial" English so some things may be down right incomprehensible.

Anyway, I hope this helps.

Tim
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exavid
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PostSubject: Re: Air Screw adjustment   Fri May 15, 2015 12:29 am

I made up a system like the two bottle manometer shown in the Utube video. It takes longer for an out of balance system to suck fluid into the throttle body. To make things easier and faster I bought two Harbor Freight vacuum gauges, inserted to plastic acquarium valves in line with each gauge so that I could adjust for minimum needle flutter and used that for a fine gauge type balancer for less than $20 total. Before using the first time I T'd the two gauges together so I could connect them to the same vacuum source to make sure the two gauges registered the same or needed a correction factor. The two gauges I had were the same within less than a 1/2" of mercury which is more than sufficient for balance. Actually once the throttle plates are open more than 25-30% throttle body balance doesn't have much effect on the engine operation. You may hear a metallic knocking sound if the bodies are way out of balance but usually only as you open the throttle and the engine begins to pick up the load. This happens because one cylinder is taking up most of the load which sets up vibrations due to the unbalance. The sound and vibes will go away as the throttle is opened and engine speed rises. You can do a good job balancing four cylinder engines with a two bottle or gauge system as well. One just balances a pair of cylinders at a time then T two cylinders together on each guage and balance the two banks together. A bit slower than using four gauges but works just fine. Having owned a '57 MGA with side draft SU carbs I got pretty good balancing the things. On that car it seemed to need it about once a month to keep it running smooth.

https://www.youtube.com/watch?v=MbiI5CbKoWo
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saninpwnzor
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PostSubject: Re: Air Screw adjustment   Mon May 18, 2015 8:36 pm

thx you very much i m gona try this.
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