$1.55 Carb Synchronizer

[skids]

It makes sense to me. I have used a LOT of manometers in my career to measure differential static pressures, total pressure, velocity pressures. You may come up with a marketable tool if you can figure out how to "activate" and "deactivate" the tube ends simultaneously to prevent sucking the water out in an instant! I believe you might need a good dampener device as well because the pulsating of the columns would be amplified, wouldn't it?

Originally posted by Bill
Ken Talbot wrote:I don't think the reservoir is the answer.
Picture this:[list][*]In the original example, 2 carbs are connected by a single, continuous tube[*]Vaccuum from each carb acts on the fluid from both sides[*]If the carbs are in balance (i.e. equal vaccum), the fluid remains centered at the bottom of the loop[*](snip)list]Does that make sense?

[irb9494]

Check out the BMW site,

http://www.airheads.org/contrib/4dollarmano.html

It's similar to the $1.55 gauge, but they call it a $4.00 sync gauge. Once again, it is for dual carbs, but they also offer a brief description of acceptable liquids. Maybe this will help the curious among us.

[Bill__Woods]

my 2 cents

Why go thru the trouble. you can do it 2 cylinder at a time in the 3 pairs as described earlier. all you need is 2 common vacuum gauge. like the one most of you have and a second one like the mightyvac, which some of you have. mark with a grease pen where #3 is and set 4 to it. balance #1 and #2 to each other. check# mark#3 again. set #2 to #3 grease pen mark. set idle.
Now check #3 one more time and mark it. check #1,#2,#4 to this make. adjust as needed. you will need a damper/restrictor to use a vacuum gauge though, to keep the needle from bouncing madly. you can calibrate your vacuum gauge to you vacuum pump by hooking the gauge to the vacuum pump, and pump it to like 15" and see if they both read the same.

just my 2 cents!

[xj11john]

cheap homemade carb synchronizer

Did anyone attempt or have success building one of this post's carb synch tools?

[TopCatGr58]

Hey XJ11John,

I tried it, even got some fancy aquarium valves to that I could have all 4 carbs hooked up at once, and then switch between pairs of carbs. I used Mystery Marvel Oil...also red, and combustible and non harmful "WHEN" sucked into the intakes!

I had bench synched my carbs using the visualization of the three tiny venturi holes in the top of the carb throats. But the amount of vacuum was still too strong, and I didn't even get any time to try to adjust the butterflies, the fluid just got sucked up into the synch ports shortly after the engine was running. I tried several techniques to clamp off the hoses, and release them evenly, but every time, once vacuum reached the lines, it just sucked the fluid right up!!! The Fluid is just too light! SO...I say make your own using a vacuum gauge but not this $4.00 one!
T.C.

[xj11john]

visual synch?

I had bench synched my carbs using the visualization of the three tiny venturi holes in the top of the carb throats.

T.C. could you explain this in more detail, is it much different or a better method than the bread tie pre-synch?

[TopCatGr58]

Hey John,

On the front engine side of the carbs on the top of the throats, you'll see both the Pilot Screw hole along with a couple of other holes in a triangle pattern. The butterfly will partially cover them when fully closed. I just visually set the butterflies to partially cover the same amount of the same hole on each carb. Not sure if it's any more accurate than the breadstick tie method, but I think a bit easier, you don't have to mess with the ties, it's all visual!!
T.C.

[Badger]

Balancing

I guess if the budget is less than $5, plastic tubes and water is the go.

I thought it was on this site that I read about the aquarium valves, an automotive vacuum gauge and a plenum chamber. I know that blows the budget out to over $30 [depending on the quality of the gauge], but as a sync tool, this set up gives an excellent result.