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03-28-2011, 02:14 PM
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Join Date: Mar 2010
Location: Park City, Ut
Posts: 15
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Carb sync gauges
What's the best way to go when buying carb sync gauges? There are two gauges, one with two needles or electronic ones like the CarbMate.
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03-28-2011, 04:31 PM
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Join Date: Mar 2008
Location: Texas
Posts: 1,378
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Carb Synch
Many thoughts on this of course. And since they are BMW carbs (Bing) the standard route is the motorcycle method. Personally, I bought a used MP gauge off a wrecked twin from an aircraft salvage yard. The advantage is they have dampeners already built in. You get the two needles to match and you're done. This is also shown as an alternative method on the Rotax Owners Association website. And you do want to balance them pneumatically even if they sound/feel good after your mechanical balance.
Pete
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03-28-2011, 04:55 PM
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Join Date: Feb 2005
Location: Huskerland, USA
Posts: 5,862
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I use an old school mercury tubes on a board gage for balancing the carbs. I'm not sure how sensitive they are compared to the Carbmate sytle gages, but they seem to work just fine for me. They don't store as well becuase you ahve to keep them upright or the mercury will spill out. 
__________________
RV-7 : In the hangar
RV-10 : In the hangar
RV-12 : Built and sold
RV-44 : 4 place helicopter on order.
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03-28-2011, 08:47 PM
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Join Date: Oct 2010
Location: La Feria Texas
Posts: 3,822
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Now THAT brings up some thoughts. Why not install the MP gauge permanently? You could check balance everytime you started the engine.
I used to keep my four carb Honda in tune with the mercury tubes, lots of trouble to keep the darned things from spilling.
Quote:
Originally Posted by Peterk
Many thoughts on this of course. And since they are BMW carbs (Bing) the standard route is the motorcycle method. Personally, I bought a used MP gauge off a wrecked twin from an aircraft salvage yard. The advantage is they have dampeners already built in. You get the two needles to match and you're done. This is also shown as an alternative method on the Rotax Owners Association website. And you do want to balance them pneumatically even if they sound/feel good after your mechanical balance.
Pete
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03-28-2011, 10:14 PM
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Join Date: Mar 2005
Location: Sandpoint, Idaho
Posts: 104
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Carb sync
We did the carbs. on the two 912's in an Aircam Sat. We used a 10ft. piece of clear tubing half full of water, ends connected to each carb.and loop down to ground, with a clamp just above each water line. after starting eng. slowly loosen clamps and if carb. adj. is to far off tighten clamp before eng. ingests the water. No harm if it gets away from you, remember water injection!
Ted
Sonerai 2 1977
RV-4 2007 550 hrs.
12 emp. and wings done
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03-29-2011, 02:13 PM
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Join Date: Jul 2009
Location: High Wycombe, UK
Posts: 288
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We bought a Synchromate for balancing the carbs on the Rotax's in our charge (UK Tecnam dealers).
Works a treat and personally, I find it much easier to watch the LED move than to watch two needles.
__________________
Jerry Parr
England
Ex RV-12
Loving Rotax....
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03-29-2011, 04:28 PM
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Join Date: Mar 2008
Location: Texas
Posts: 1,378
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Synchromate
Quote:
Originally Posted by aerofurb
We bought a Synchromate for balancing the carbs on the Rotax's in our charge (UK Tecnam dealers).
Works a treat and personally, I find it much easier to watch the LED move than to watch two needles.
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too expensive for as little as an individual would use it. might work well for a group buy! Too many cheaper alternatives for a single use.
Pete
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03-30-2011, 09:16 PM
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Join Date: Aug 2009
Location: Gilbert, AZ
Posts: 118
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In the US they are about $180, consideriung I am spending $24K on the engine thats not very expensive...
__________________
Chris Lucier
http://RV12SP.Blogspot.com
RV12 Empennage Arrived (Early) 
N712EC Serial number 120424
President EAA Chapter 228
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03-30-2011, 09:39 PM
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Join Date: Mar 2008
Location: Texas
Posts: 1,378
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Synchromate
If they were the only way to get an accurate pneumatic synch I would agree but they are not. Water/mercury...any liquid in a tube does the same thing. I would rather spend my money on a soft start module to avoid a kick back and more expensive broken sprague clutch.
Pete
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