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Old 01-02-2016, 05:44 PM   #1
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Engine Synchronizer

How important do you think a synchronizer is on gas engines? What is it mostly use for fuel mileage or what? Did a search and could not find a thread.
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Old 01-02-2016, 06:27 PM   #2
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The best one is just listen. Your ear can get as close as any glendinning. Now, the newer electronic controlled engines with auto synk, thats different.
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Old 01-02-2016, 06:36 PM   #3
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During our 1,600 mile trip our synchronizer stopped working. I spent the last 5 days of the trip synchronizing by ear. It's a PITA compared to the joy of one throttle for both engines underway, especially when you need to slow down and speed up constantly on the ICW.

When we arrived at our destination, I called Glendinning and they patiently helped me diagnos the problem, sent me the needed parts at a fair price and walked me through the repair. I'm synced again and happy with Glendinning.
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Old 01-02-2016, 06:38 PM   #4
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My impression is that twin-engine owners, especially pilots of multi-engine aircraft, prefer to manually synchronize the engines.
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Old 01-02-2016, 06:42 PM   #5
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Originally Posted by markpierce View Post
My impression is that twin-engine owners, especially pilots of multi-engine aircraft, prefer to manually synchronize the engines.
Mark, a post without a picture? Shame on you.
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Old 01-02-2016, 06:54 PM   #6
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Mark, a post without a picture? Shame on you.
Auxiliary helm on a "real" vessel:

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Old 01-02-2016, 07:00 PM   #7
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Now I feel better.
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Old 01-02-2016, 08:26 PM   #8
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Having had to run my boat without the synch working for awhile, I was sure glad to have it back. For long legs, no big deal but for times when a lot of adjustments needed, or dealing with a following sea coming into an inlet, big PITA.
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Old 01-03-2016, 12:09 AM   #9
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Originally Posted by markpierce View Post
My impression is that twin-engine owners, especially pilots of multi-engine aircraft, prefer to manually synchronize the engines.
Truth be told, it's just that real pilots are too cheap to pay for automation if it ain't already there. Besides, we can just hand fly it.
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Old 01-03-2016, 08:37 AM   #10
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Sitting so close to the engines in a plane it is easy to hear the engines but from the fly bridge it is a lot harder to hear.


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Old 01-03-2016, 08:58 AM   #11
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So on mechanical engines, has anyone installed a sync themselves? Our current 6.3 Volvos do't have them, but I was considering adding one next summer. Is it something that the do-it-yourselfer can do easily? To me, it seems like the install is straight forward enough, but the post install setup would be the bear.
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Old 01-03-2016, 09:03 AM   #12
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Call Glendinning Tom. They are very helpful. It all depends on how your throttles are set up, including of course hydraulic vs. cable vs electronic, and the method of getting an accurate tach reading, preferably direct from engine. It is actually a pretty simple system.
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Old 01-03-2016, 09:04 AM   #13
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Quote:
Originally Posted by kartracer View Post
How important do you think a synchronizer is on gas engines? What is it mostly use for fuel mileage or what? Did a search and could not find a thread.

Could impact several things... ride, fuel, noise... all of the above...

At least four ways to sync:
- listen
- analyze your wake
- needle gauge (using tach sender info)
- mechanical or electronic system (e.g, Glendinning)

The inexpensive needle gauge used for syncing is simply taking pulses from the tach output (not the tach readings themselves), comparing, and when the needle is straight up (typically) both engines are running at the same RPMs. That of course depends on how accurate the senders are

We don't have one now, but did on an earlier gas boat... and I found it useful to compare sound and wake to the needle... as I was learning that boat...

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Old 01-03-2016, 09:22 AM   #14
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Originally Posted by caltexflanc View Post
Having had to run my boat without the synch working for awhile, I was sure glad to have it back. For long legs, no big deal but for times when a lot of adjustments needed, or dealing with a following sea coming into an inlet, big PITA.
I agree! My Micro Commander throttles are not automatically synching the engines and so far the MC Tech hasn't been able to solve the problem. Luckily, I've had some multi engine time and synching them by ear is not a big deal. (Harder from the fly bridge as was previously noted.)
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Old 01-03-2016, 09:30 AM   #15
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Syncing by ear is not as easy as you think. For those of you with synchronizers, try synching by ear, then engage the synchronizer. You'll be surprised at the difference. It's kind of like driving a straight line in choppy water and then turning on the AP. You can do it, just not as well.
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Old 01-03-2016, 09:42 AM   #16
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Quote:
Originally Posted by Tom.B View Post
So on mechanical engines, has anyone installed a sync themselves? Our current 6.3 Volvos do't have them, but I was considering adding one next summer. Is it something that the do-it-yourselfer can do easily? To me, it seems like the install is straight forward enough, but the post install setup would be the bear.
Glendenning syncs are great, robust and pretty fool proof to install. Will also bet they can get closer than all but superman on syncing better than ear.

The hardest thing is finding a good mounting spot where the cable runs are out of the way and compliant.

I was a repair tech for them when I worked for a marine electronics firm.

I believe they also have an adapter for very accurate tachometers...but havent looked at their website in years.

Just recently tossed the manuals and alignment tool making room on the boat.
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Old 01-03-2016, 10:18 AM   #17
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Just curious, will not a set of digital tachometers like Aetna get you as close as a synchronizer? Where does the synchronizer get its signal in this case?

Some get a signal off an alternator. Then a new belt on only one side gets installed, or a new pulley or ---

Also, engine speed, prop RPM, prop HP and fuel burn per side can independently vary. Then mismatched props enter into the equation. What are we really trying to get in sync? And why?
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Old 01-03-2016, 12:00 PM   #18
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Just curious, will not a set of digital tachometers like Aetna get you as close as a synchronizer? Where does the synchronizer get its signal in this case?

Some get a signal off an alternator. Then a new belt on only one side gets installed, or a new pulley or ---

Also, engine speed, prop RPM, prop HP and fuel burn per side can independently vary. Then mismatched props enter into the equation. What are we really trying to get in sync? And why?
Are you asking about a Glendenning?

My understanding is syncing is all about eliminating vibration in the drive train. Partly for wear and tear....and some people get freaked about the noise.
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Old 01-03-2016, 12:25 PM   #19
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I have Aetna digital tach's

After four seasons don't see the need for synchronizers but perhaps I am under informed?

Actually I don't try to get them, exactly the same. Close, i.e. Within 10 or so rpm is fine.

What would the real world measure able benefits of tighter rpm sync???? Never thought much about it before this thread
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Old 01-03-2016, 12:30 PM   #20
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I would always vote yes to synchronizers. However, how much they will benefit you and how necessary they are also depends on your usage of the engines. I'd say the higher the rpm and the greater the speed, the more advantageous they are.
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