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  #1  
Old 03-21-2016, 08:49 PM
walkergp walkergp is offline
 
Join Date: Sep 2007
Location: Fort Worth, Texas
Posts: 11
Default Mixture Arm Interference with Starter

I have installed Van's mixture bellcrank and bracket for an IO-360A1B Horizontal Induction. When I connect to the mixture arm I am unable to get full throw due to interference with starter (see pic). This engine installed in another aircraft was configured with the arm in the down position where there would be no interference. Van's said I either need a shorter starter or modify the arm to avoid the contact. Even if I use the lower hole and cut off the top portion it does not look like I will still get full throw.


Any suggestions?
Thanks,
Greg Walker
RV-8A
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  #2  
Old 03-22-2016, 09:44 AM
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airguy airguy is offline
 
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Location: Garden City, Tx
Posts: 5,590
Default

Reroute the cable?
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  #3  
Old 03-22-2016, 09:57 AM
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Mike S Mike S is offline
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Location: Dayton Airpark, NV A34
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Default

Can you turn the injector servo to a different position--------clock it 90* ???
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  #4  
Old 03-22-2016, 08:39 PM
Boyd Birchler Boyd Birchler is offline
 
Join Date: Sep 2014
Location: IN
Posts: 254
Default Mixture arm issue

You have an offset arm, it appears that a straight arm would clear.
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  #5  
Old 03-22-2016, 10:17 PM
walkergp walkergp is offline
 
Join Date: Sep 2007
Location: Fort Worth, Texas
Posts: 11
Default

Thanks for the ideas!

airguy - Rerouting the cable could be done from the bottom like the prior installation of this engine. I assume Van's had a reason for routing it above the sump. My exhaust is supposed to be delivered any day so that will give me a better chance to look for alternate routing.

Mike S - Not sure I understand clocking the injector servo?

Boyd - I think a straight arm would clear the starter. Might need a longer bellcrank as it appears the angle would be too oblique for the mechanical advantage. Do anyone have a source for these arms?

Thanks,
Greg
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  #6  
Old 03-23-2016, 07:11 AM
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JanRV6UK JanRV6UK is offline
 
Join Date: Jul 2009
Location: England
Posts: 470
Default Question

Hi,

May I ask what make and model starter you have fitted ?
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  #7  
Old 03-23-2016, 07:18 AM
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RV7Guy RV7Guy is offline
 
Join Date: Jan 2005
Location: Chandler, AZ
Posts: 3,000
Default Just did this

Hi Greg,

Just went through this last week. You'll notice the arm attached to the mixture is locked by teeth like a gear. Loosen the nut and move it forward one tooth at a time. I think I moved mine a tooth or two. Check the travel.

I am clear of the starter but only by 1/8," but it is clear and everything is smooth with full travel.


[quote=walkergp;1064119]I have installed Van's mixture bellcrank and bracket for an IO-360A1B Horizontal Induction. When I connect to the mixture arm I am unable to get full throw due to interference with starter (see pic). This engine installed in another aircraft was configured with the arm in the down position where there would be no interference. Van's said I either need a shorter starter or modify the arm to avoid the contact.
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  #8  
Old 03-23-2016, 08:26 AM
Bill Dicus Bill Dicus is offline
 
Join Date: Jan 2005
Location: Shorewood, WI (Milwaukee area)
Posts: 1,066
Default Interference

I did not use the Van's bracket. Flipped the arm down and made a simple bracket of bent steel, attaching by two bolts to a flange on the case of my IO-360M1B. This allowed direct movement with no reversal of action and has worked flawlessly for 50 hours. Will try to post pic. I believe others have done something similar. Good luck and please post your solution. Thanks.
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  #9  
Old 03-23-2016, 09:47 AM
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JonJay JonJay is offline
 
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Default

Remember, if you flip the arm the opposite way, you reverse the operation.
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  #10  
Old 03-23-2016, 10:07 AM
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Toobuilder Toobuilder is offline
 
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Location: Mojave
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Default

Quote:
Originally Posted by JonJay View Post
Remember, if you flip the arm the opposite way, you reverse the operation.

Yes, but when you dump the Rube Goldberg bellcrank, you "unreverse" the action, and it works fine.

I did this change on the -8 and it works great. With Van's focus on simple and light, I never could understand why he added the extra complication of a bellcrank.
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WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.

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Last edited by Toobuilder : 03-23-2016 at 10:13 AM.
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