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Drilling hole in Precision Carburetor Throttle arm

 
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vshimsl(at)live.com
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PostPosted: Sun Mar 15, 2009 7:01 am    Post subject: Drilling hole in Precision Carburetor Throttle arm Reply with quote
Hello C

The Van's throttle and mixture cables do not have enough throw for my precision carburetor (Part of Aerosport package). The only option I have left is to drill another hole in the throttle and mixture arms at the carburetor to increase the effectiveness of the throw I do have.

I understand some metal parts are cast and drilling is a no-no. Has anyone been down this road? Your solution?

Thanks C
Vince H.
rv8 N8432
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John Myers



Joined: 10 Jan 2006
Posts: 11
Location: Cedar Bluff, AL
PostPosted: Sun Mar 15, 2009 7:47 am    Post subject: Drilling hole in Precision Carburetor Throttle arm Reply with quote
Vince, I had the same problem with the mixture cable. Even got a new cable from Van's. I think I remember that it had about an 1/8" greater travel but not much. Same problem with it after a major pain to replace it. Throttle cable was okay for my throttle linkage on the the MA4-5 that I have.
I ended up adjusting the mixture cable linkage so that it would go to full idle cutoff. Turns out that my MA4-5 (10-3878) is so rich that it was not a problem at full rich position. My flow meter indicates it is putting almost 18 gph through it at (my) full rich/full power. I talked with Precision and they said no shorter mixture arm available.
I suppose you could special order a cable with more travel and then possibly drill another hole in your throttle quadrant arm to give you more travel if it is needed, but it wasn't necessary for me.
No help with your problem but one data point.

John RV-8 N851JM
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AMARGHERITIS(at)lawa.org
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PostPosted: Sun Mar 15, 2009 10:52 pm    Post subject: Drilling hole in Precision Carburetor Throttle arm Reply with quote
Vince,

I too had this problem. I drilled new holes just above the existing
holes on the mixture and throttle levers at the quadrant. This gave me
the throw I needed.

Alex

RV-8 N214MK 240hrs



________________________________

From: owner-rv8-list-server(at)matronics.com
[mailto:owner-rv8-list-server(at)matronics.com] On Behalf Of John Myers
Sent: Sunday, March 15, 2009 8:44 AM
To: rv8-list(at)matronics.com
Subject: Re: Drilling hole in Precision Carburetor Throttle
arm



Vince, I had the same problem with the mixture cable. Even got a new
cable from Van's. I think I remember that it had about an 1/8" greater
travel but not much. Same problem with it after a major pain to replace
it. Throttle cable was okay for my throttle linkage on the the MA4-5
that I have.

I ended up adjusting the mixture cable linkage so that it would go to
full idle cutoff. Turns out that my MA4-5 (10-3878) is so rich that it
was not a problem at full rich position. My flow meter indicates it is
putting almost 18 gph through it at (my) full rich/full power. I talked
with Precision and they said no shorter mixture arm available.

I suppose you could special order a cable with more travel and then
possibly drill another hole in your throttle quadrant arm to give you
more travel if it is needed, but it wasn't necessary for me.

No help with your problem but one data point.



John RV-8 N851JM

---

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