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parts needed for sync of dual carbs

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lcottrell

Joined: 29 May 2006
Posts: 1494
Location: Jordan Valley, Or

Posted: Wed Dec 17, 2008 8:56 am Post subject: parts needed for sync of dual carbs

I notice that Lockwood has a dual carb sync kit for around  $79.00, Seems like a lot of money for a one time use. Would it be worthwhile to  build one from available parts? Any body done it?

  

 Minus 6 this morning. BRRRRRR

 Larry C

   [quote][b]

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Wed Dec 17, 2008 9:40 am Post subject: parts needed for sync of dual carbs

Larry:

  

 Its 66F at hauck's holler.  Sun is trying to  burn off this crud and I'm going to commit aviation.

  

 After all the talk of sync'ing carbs with vacuum  gauges, I purchased to high quality, viscous dampened vaacuum gauges.  Made  me a carb sync board and did a job on the 912ULS.  My mechanical settings  were as close as the vacuum gauges could get.  Accidently broke one gauge,  put it into the prop ;-(, and am back to mechanical sync'ing again.  I am  satisfied with the results.

  

 I bet you can sync the HKS carbs mechanically using  the procedure in the 912 maint manual.

  

 Don't intend to spend any more money on vacuum  gauges.

  

 john h

 mkIII

 [quote]    

   I notice that Lockwood has a dual carb sync kit for    around $79.00, Seems like a lot of money for a one time use. Would it be    worthwhile to build one from available parts? Any body done it?

    

   Minus 6 this morning. BRRRRRR

   Larry C

 	  Quote: 	
		  

 	
[b]

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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

JetPilot

Joined: 10 Jan 2006
Posts: 1246

Posted: Wed Dec 17, 2008 7:07 pm Post subject: Re: parts needed for sync of dual carbs

 	  John Hauck wrote: 	
		  



Accidently broke one gauge,  put it into the prop ;-(, and am back to mechanical sync'ing again.  I am  satisfied with the results.

  

 I bet you can sync the HKS carbs mechanically using  the procedure in the 912 maint manual.

  

 Don't intend to spend any more money on vacuum  gauges.

  

 john h

 mkIII

 	
    

 

John,



That is funny, just because I thought I was the only one to have ever done that      Thank Goodness I have a Warp Drive prop, anything less would have shattered into a million pieces.   The guage was less fortunate...



I am also back to mechanical adjustment, but I am not sure how close I am getting.   Given your accuracy with mechanical sync, could you post your technique ?



Thanks,



Mike

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Wed Dec 17, 2008 7:27 pm Post subject: parts needed for sync of dual carbs

> I am also back to mechanical adjustment, but I am not sure how close I am 

getting.   Given your accuracy with mechanical sync, could you post your 

technique ?

 	  Quote: 	
		  

 Thanks,



 Mike


	




Mike:



It is in the maintenance book on the Kodiak web site.  I do it like the book 

describes.  It works for me.



john h

mkIII

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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

icrashrc

Joined: 16 Mar 2006
Posts: 247
Location: Mishawaka, In

Posted: Thu Dec 18, 2008 4:44 am Post subject: Re: parts needed for sync of dual carbs

I have a mercury filled carb sync tool [up to 4 carbs]. It works very well. I purchased it from J.C. Whitney over 20 years ago. I have no idea what it cost but i am pretty cheap.... er, frugal.  



[quote="lcottrell"]I notice that Lockwood has a dual carb sync kit for around  $79.00, Seems like a lot of money for a one time use. Would it be worthwhile to  build one from available parts? Any body done it?

  

 Minus 6 this morning. BRRRRRR

 Larry C

   [quote]

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Scott

www.ill-EagleAviation.com

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robcannon

Joined: 22 Jun 2008
Posts: 39
Location: British Columbia

Posted: Thu Dec 18, 2008 6:29 am Post subject: Re: parts needed for sync of dual carbs

Here's a very simple, accurate, gage you can build in ten minutes for about 5 bucks.  Buy about 6 ft of clear plastic tubing, sized to fit the nipple on your carb or manifold. Fill the tube about half way with some oil (I used pretty blue two stroke oil)  Form a low loop with the ends attached to the carbs and tape the whole affair in place with the part with the oil in it parallel and touching each other (make sense). If you are working on a hks you can remove the prop to make things easier and much safer. 

The hks doesn't mind being run with no prop ( I keep the revs below around 3500)  The carbs should be mechanically synchronized before you start the engine or the oil will quickly get sucked into the weaker carb. As you adjust the carbs the oil level will move toward the weaker carb.  It is quite easy to get the carbs perfectly balanced ! By the way, I did it without the prop, then checked it with the prop and it made no difference, other than the engine ran much smoother with no prop.

cheers, Rob

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aslsa.rng(at)gmail.com
Guest

Posted: Thu Dec 18, 2008 11:20 am Post subject: parts needed for sync of dual carbs

Yeah, Larry I did it. two inexpensive vacuum gauges (at) $20 + two inline valves (at) 10 + plus fittings and lines $10 to $15 depending on application. + shipping.Who said it was a one time thing? After I got my carbs set the CHT's and EGT's were dead even at all times 5 degree spread for the CHT's and 25 for the EGT's, but always in that range. When the carb boots started to leak the temp spreads grew. I went back to the vacuum gauges to get a reading and reset. Temp spread grew again. Time to look elsewhere. Found rotted carb sockets.

 Even if you don't use it as a diagnostic tool, what about every annual? Having balanced carbs is paramount for the best fuel economy and engine performance, why would you not include it as an item on your annual?

 



Rick

On Wed, Dec 17, 2008 at 10:55 AM, Larry Cottrell <lcottrell(at)fmtcblue.com (lcottrell(at)fmtcblue.com)> wrote:

  	  Quote: 	
		         I notice that Lockwood has a dual carb sync kit for around  $79.00, Seems like a lot of money for a one time use. Would it be worthwhile to  build one from available parts? Any body done it?

  

 Minus 6 this morning. BRRRRRR

 Larry C

   [/b] 	


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lcottrell

Joined: 29 May 2006
Posts: 1494
Location: Jordan Valley, Or

Posted: Thu Dec 18, 2008 12:13 pm Post subject: parts needed for sync of dual carbs

[quote] ---

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zeprep251(at)aol.com
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Posted: Fri Dec 19, 2008 5:08 am Post subject: parts needed for sync of dual carbs

Carb sockets from rotax just don't hold up .The JBM rubber sockets, boots replaced the originals at 150 hrs and were still on it and in good working order when I sold it at 600+ hrs, plus they cost less!  503DCDI.

 

                                              G.Aman mk3-C Jabiru 2200 400hrs

 

   

 

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