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dons701
Joined: 22 May 2009
Posts: 80
Location: Hershey, PA
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 Posted: Fri Sep 25, 2009 6:36 am Post subject: Bing WOT ? |
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Hello All'
Had my carb off the other day and noticed that the throttle plate, with the throttle arm full open to the stop, was not completely open. If I were to guess, I would say 5 to 7 degrees from being completely wide open. What is interesting, did Bing or Jabiru intend this to have a slight directional effect towards the roof of the intake plenum?? I say this because there is not much distance between carb and plenum divider and it could have been used to keep the heavier fuel droplets suspended higher in the airstream. Or, this was a mistake to be corrected by carefully adjusting the throttle stop for a straight shot. The other option of course is to leave it alone as the engine runs fine with 2950 RPM turning a 64 inch prop, but many small refinements can make a noticeable difference. Any one else notice this ???
Thanks in advance, Don
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Zenith 701 #76120
Jabiru 2200A #2456 95 hours
Sensenich Wood 64-PJ-36 Prop |
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pete(at)usjabiru.com
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| Posted: Fri Sep 25, 2009 7:17 am Post subject: Bing WOT ? |
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Per Bing specifications the max flow through the carb happens with the
butterfly open 78 to 80 degrees. Going to 90 degrees exposes the cross rod
to the airflow, creates turbulence and slows the slow through the carb.
That's why the throttle arm has a restriction to about 80 degrees open.
Pete
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Peter H
Joined: 20 Mar 2007
Posts: 197
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| Posted: Fri Sep 25, 2009 1:22 pm Post subject: Bing WOT ? |
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Don,
The slightly displaced butterfly will keep the charge turbulating.
When fully open the reduced turbulence allows the heavier fuel droplets to
pass through the induction collector to the end where #1 and #2 get too
rich.
Peter
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dons701
Joined: 22 May 2009
Posts: 80
Location: Hershey, PA
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| Posted: Fri Sep 25, 2009 8:22 pm Post subject: Re: Bing WOT ? |
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Thanks Pete and Peter, knowledge is a wonderful thing. I'm shure others will find this interesting.
Don
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Zenith 701 #76120
Jabiru 2200A #2456 95 hours
Sensenich Wood 64-PJ-36 Prop |
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