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Old 07-25-2006, 06:24 PM   #1
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Sync yer' Carbs on a budget..YEP

The $1.55 Carb Syncronizer by Marty Ignazito martycarbsync
http://www.powerchutes.com/manometer.asp

The objective of the vacuum measuring carb synchronizer is to see that the vacuum signals from both carbs are the same. It is the difference between the signals and not the actual signals we are interested in however. The Rotax two stroke engine shows a signal of about 6" of mercury at idle measured against the atmosphere at its test signal port and a difference of about 1/16th to 1/20th of an inch of mercury can be read easily by eye. If lighter liquids are used like oil this signal would read as about 97 inches of oil requiring a very tall manometer gauge. With a senstivity of some 16 times greater than a mercury manometer, an oil manometer only needs to look at the difference. By hooking each side of the manometer to each of the carbs we have a very sensitive tool for synchronization. A 1/20th of an inch of mercury difference would show up as about 13/16ths of an inch of oil on the oil manometer allowing for even finer adjustment than possible with mercury.

Attached is a photo of an oil manometer I made up with some cheap materials from the local Ace hardware store. I filled mine with air compressor oil since I did not have any two stroke oil around, but two stroke oil would be a better safety measure in the event of oil getting into a carb.

Here is the bill of materials:

12 ft of 1/8" ID clear PVC tubing $0.84

1 wooden yardstick $0.59

2 wire ties $0.12

For a total cost of $1.55 plus tax.

The tubing was taped to the yardstick with transparent packing tape. The wire ties were put thru the hole in the yardstick to secure the tubing on each side at the top. If desired a machinists or carpenters square and a pencil can be used to extend the 1/8" markings to both sides of the stick or the level of the oil on one side can simply be noted before testing begins since it must return to this point to be in balance. Fill with oil to about the 26 or 27 inch mark (36 at the bottom). You may have to leave the unit sit for a day or so to get all the bubbles out. If you are careful not to introduce air when filling this is less of a problem.

When in use with the engine running both lines must be connected, one to each carb. The oil will be sucked up and out of the manometer if only a single carb is connected and the other end is left open to the atmosphere.

This device is so simple and cheap to make, I thought it best to just tell everyone how to do it rather than try to make and sell them. Bing's claim that their $34.95 mercury device is the most accurate carb balancer regardless of price seems to ring hollow doesn't it? I will try this unit as soon as I get a chance. If any of you beat me to it, let me know how it works for you.

Marty

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Marty Ignazito
13961E Co. Rd. 620N
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61920-7831
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e-mail: mdipe@mcleodusa.net
Website: http://www.powerchutes.com/prairieskyhook.htm
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Old 07-25-2006, 06:33 PM   #2
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Good post. going to make one.
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Old 07-25-2006, 11:58 PM   #3
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Hmmmph. Has anyone tried this yet? This guy doesnt even know if its gonna work.
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Old 07-26-2006, 12:09 AM   #4
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Old 07-26-2006, 12:35 AM   #5
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im gonna start makin , tall will buy it, it will be stuff 4 1-handed people, like another hand to jerk off with...... and yall will buy it
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Old 07-26-2006, 12:39 AM   #6
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you can synch tb's with it too... hmm.. i think i may try this
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Old 07-26-2006, 12:42 AM   #7
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They already got one of those, it's called a fleshlight
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Old 07-26-2006, 12:42 AM   #8
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BTW congrats on 1000 posts, woot! =)
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Who I am now is not who I was, and who I will be is better than anything I ever could have imagined. I am Filled with the Spirit of Christ and I walk surrounded by a Host Of Angels, who can stand before the Army of ? Amen!
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Old 07-26-2006, 12:42 AM   #9
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lol flesh lights ROCK
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Old 07-26-2006, 12:43 AM   #10
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Old 07-26-2006, 08:21 AM   #11
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*sigh*... i've tried this already. Ended up buying a real sync-ing tool afterwards. I mean, it works, but it's pretty hard to tune. A real sync tool is so much better and faster. Remember that you have FOUR carbs/TB's to sync and not two... so one thing is that you gotta move those two tubes three times to get them to sync. Iono, got annoying. When i got my new sync tool, i tried syncing with this one and see how accurate it was... was pretty off... wasn't bad, but definitely not the best.
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Old 07-26-2006, 12:20 PM   #12
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then why not just make 2 of these and mount them side-by-side for the 4 carbs?
seems like it would be ok, altho i already have a regular sync tool
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Old 07-26-2006, 02:48 PM   #13
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Michael, being an instrument engineer myself, I know quite a bit about these things. It is a simple balancing act between 2 carbs. This will not work to accuratly sync an inline 4. Reason being that it is balancing the suction between 2 points of reference where you have 4 points sucking.

You have to be able to measure all 4 reference points at once. If you did a 2+2 Setup, you would not have the other 2 in sync with the the other 2 even though they would be sync'd with each other. You would end up needing 3 of these setups and a few tubing T's. The setup would need to look like this...
212e4xg
The oil would need to be level before the engine starts and after syncing.
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Old 07-26-2006, 04:28 PM   #14
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Quote:
Originally Posted by bdmpastx
Michael, being an instrument engineer myself, I know quite a bit about these things. It is a simple balancing act between 2 carbs. This will not work to accuratly sync an inline 4. Reason being that it is balancing the suction between 2 points of reference where you have 4 points sucking.

You have to be able to measure all 4 reference points at once. If you did a 2+2 Setup, you would not have the other 2 in sync with the the other 2 even though they would be sync'd with each other. You would end up needing 3 of these setups and a few tubing T's. The setup would need to look like this...
212e4xg
The oil would need to be level before the engine starts and after syncing.
this item was found on a triumph two cylinder forum.
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Old 07-26-2006, 04:59 PM   #15
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yea, its only usefull to us 2 cyl guys
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Old 07-26-2006, 05:00 PM   #16
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Quote:
Originally Posted by StealthR6
*sigh*... i've tried this already. Ended up buying a real sync-ing tool afterwards. I mean, it works, but it's pretty hard to tune. A real sync tool is so much better and faster. Remember that you have FOUR carbs/TB's to sync and not two... so one thing is that you gotta move those two tubes three times to get them to sync. Iono, got annoying. When i got my new sync tool, i tried syncing with this one and see how accurate it was... was pretty off... wasn't bad, but definitely not the best.
I have a v-twin. I should work good for me...I could see how a 4 would be a problem
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Old 07-26-2006, 05:04 PM   #17
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well, its good for my 500 twin suzuki, twin triumphs with two carbs etc etc . and as said, you can always make two, or one with 4 hoses with plastic T's and such
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Old 07-26-2006, 06:20 PM   #18
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2 wouldn't work either cause you would be left without syncing the 2 pairs together.
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Old 07-26-2006, 06:22 PM   #19
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Quote:
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2 wouldn't work either cause you would be left without syncing the 2 pairs together.
correct sir, just best to be left witht he 2 cylinder guys, or buy em a vac. guage, they are cheap enough. But its a good cheap tune tool if needed.
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Old 07-26-2006, 06:28 PM   #20
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I design a lot of similar for levels all the time. In the plant they use mercury manometers for calibrating.
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