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CarbMate

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JohnF

Joined: 13 May 2010
Posts: 124

Posted: Sat Dec 28, 2013 1:40 pm Post subject: CarbMate

I used a Carb Mate synchronizer once and found I was fumbling around a lot to get the carbs  balanced.



If, for examle, the LED light is offset to the right, do you loosen , or tighten the cable feed to that right side carb?  Or do either to the left side?



Instructions didn't provide  any clues.

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Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Sun Dec 29, 2013 5:08 am Post subject: Re: CarbMate

Hi John,



This is one of my dislikes about electronic devices. I still prefer gauges. You can't diagnose with electronic devices. I have used them, but always gone back to gauge. The easiest way to check and see is to move a carb throttle arm and watch the indicator. If you do it to both one at a time then you can watch the indicator move to where you want it and then know how far and which carb to adjust. I think gauges are faster.

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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

rlborger(at)mac.com
Guest

Posted: Sun Dec 29, 2013 8:56 am Post subject: CarbMate

Hi John,



I use a balancing tool similar to the Carb Mate to do my synchronizing.



First, only adjust one side, never both sides.  All you are trying to do is get one side to match the other.  If you try to adjust both sides you’ll be chasing it all day long.



Pick a side to adjust and make a small adjustment on the ferrule, really doesn’t matter which way, all you want to see is which way the Carb Mate changes.  If it improves, that's the way you want to adjust to balance.  If the Carb Mate goes the wrong way, you want to adjust the ferrule in the other direction.  Then continue to make adjustments till you get the Carb Mate centered at highest resolution.



It’s really quite easy once you get the hang of it.



Rotax-Owner.com has a good video review of the Carb Mate which includes a demonstration on its use.  You should check it out.  If you are a member of Rotax-Owner.com there are other excellent, detailed, videos available on carb balancing the 912/914.  If you aren’t a member of Rotax-Owner.com I highly recommend joining to gain access to all their other videos and to their informational e-mailing.



Blue skies & tailwinds,

Bob Borger

Europa XS Tri, Rotax 914, Airmaster C/S Prop (50 hrs).

Little Toot Sport Biplane, Lycoming Thunderbolt AEIO-320 EXP

3705 Lynchburg Dr.

Corinth, TX  76208-5331

Cel: 817-992-1117

rlborger(at)mac.com

On Dec 28, 2013, at 3:40 PM, JohnF <n29cx(at)ridgeviewtel.us> wrote:






I used a Carb Mate synchronizer once and found I was fumbling around a lot to get the carbs  balanced.



If, for examle, the LED light is offset to the right, do you loosen , or tighten the cable feed to that right side carb?  Or do either to the left side?



Instructions didn't provide  any clues.

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JohnF

Joined: 13 May 2010
Posts: 124

Posted: Sun Dec 29, 2013 9:59 am Post subject: CarbMate

Thank you, Bob, for your iinformation. I appreciate it. I am in an RV-12 

with 190 hours on it now...many minor items have come up but so far nothing 

major which I hope continues because if you need to get at the starter or 

other major things the entire engine would have to be pulled...a real 

pain...the RV-12 with the Rotax 912uls is pretty crowded.



Again, thank you



John

---

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Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Sun Dec 29, 2013 1:16 pm Post subject: Re: CarbMate

The problem with doing it with a blind adjustment to just make them match is if you screw one out that increases one carb's rpm then it usually will be too far out to set the idle. As a general rule you want to adjust the carb that is getting a little more fuel/air and pull that cable back to retard it some. Then when you go to idle you will still have adjustment. 

The gauges will tell you exactly which carb to adjust and by how much and how far off they are. The gauge will tell you before you spend a lot of time trying to make an adjustment if the cable lengths are close enough or too far apart to make an adjustment to get them synced and they will tell you if the idle circuit is clogged. The carbmate won't tell you any of that and you may spend a 1-3 hours working on it when using a set of gauge would have told you those things in seconds to a couple of minutes.



I bet I balance 40-50 sets of carbs a year. It's down to a science and minutes now unless some problem arises.

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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

JohnF

Joined: 13 May 2010
Posts: 124

Posted: Sun Dec 29, 2013 2:37 pm Post subject: CarbMate

Thank you, Roger. I think before my next condition inspection I want to get 

gauges...I noticed you recommend liquid-filled gauges that dampen the 

movement, which makes sense.

Would you be kind enough to recommend model/brand of gauges you use.



I also plan to purchase a dynamic prop balancer to use during the condtion 

inspection, so  before balancing the prop it seems important to get the 

carbs right. Right now I am debating between the Dyna Vibe and the ACES 

unit...both seem like they would do the job, with the ACES a suggested 

weight is provided, but otherwise they seem about the same. The ACES unit 

uses the formula that I could do myself. They cost the same, so its a toss 

up but the Dyna Vibe seems a tad easier to use.



Again, thanks for your help. I really appreciate it.



John

---

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Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Mon Dec 30, 2013 12:58 pm Post subject: Re: CarbMate

Hi John,



No special brad. I don't buy top dollar, but don't buy cheap either. When you get them just pull a vacuum on them at the same time  and make sure they are reading the same.

Put an in line needle valve in each vacuum line to pinch it down to dampen the impulses even more. You can buy every thing you need except the gauges at Ace Aviation (Ace Hardware). 



here is a picture of a simple carb sync tool that works very well and doesn't cost a lot.



I have ab Aces dynamic prop balancer. It is fairly pricey for a one time owner unless you plan on doing a lot of planes. Wouldn't it be cheaper ($300) to just pay someone a one time fee.

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carb_sync_150.jpg

Description:

Simple carb sync tool

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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

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