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Engine Sync gauge versus rpm guage
- Dusty Bilges
- Scurvy Dog
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Engine Sync gauge versus rpm guage
When my engine sync gauge shows perfect sync, the tac's are a couple hundred rpms apart. Should I just believe my sync gauge? Is that normal, or should I consider syncing by using the tac's?
- km1125
- Admiral
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Re: Engine Sync gauge versus rpm guage
Now, I saw that but I should also admit that I don't have mufflers in my system, so it's a lot easier to hear the engines than you guys who have nice mufflers installed. I'm a bit envious there though, because my boat sounds like a Harley when cruising on the lake.
- denpooch
- Commander
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- Vessel Info: 2005 360 Mariner
Crusader 6.0 Captains Choice - Location: Long Island
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Re: Engine Sync gauge versus rpm guage
Also, at times I can 'feel' the slow oscillation from the deck on my feet. The throttle and tachometer on the port side is a couple of clicks below the starboard when in sync.
- mjk1040
- Admiral
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- Vessel Info: 1998 355 AC/MY "Deja Vu"
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Re: Engine Sync gauge versus rpm guage
I'd Rather Be Boating!
1989 Sea Ray Seville
1986 Carver Mariner 32'
1990's Thompson 22' Cuddy Cabin
1990's 4Winns 245 Vista Cruiser
1980's Thompson 19' Open Bow
- Cooler
- Admiral
- Posts: 1634
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- Vessel Info: 1995 Carver 330 Mariner
Twin 350XL Crusaders
Home port: Menominee, MI - Location: Green Bay, WI
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Re: Engine Sync gauge versus rpm guage
( All weather people have to say this on air, near lakes )
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- CYO Supporter
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Re: Engine Sync gauge versus rpm guage
Dusty Bilges wrote:Source of the post....When my engine sync gauge shows perfect sync, the tac's are a couple hundred rpms apart. Should I just believe my sync gauge? Is that normal, or should I consider syncing by using the tac's?
Depending on your engine make/model/year, your tach info can come from a couple of different sources. On older vintages, the signal is typically picked up at the coils so the discrepancy can be connections, wiring, plugs, or the tachs themselves. Unless you take a reading right at each engine with a tool, you won't know for sure if your tachs are actually off or not or by how much. The sync gauge usually gets its signals from the tachs but not totally dependent on the tach reading. If yours is an EFI application and set up properly for base timing and throttle, idle is then ECM controlled and knowing the idle spec for the engine will give you an indication of how well your tachs are reading at idle, however you're assuming they are set up properly to begin with. Checking at the engine is the best way to check actual rpm, then go from there to determine if the tachs or sync are off and take corrective measures.
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