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Old 08-16-2017, 09:44 AM   #21
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Originally Posted by Ski in NC View Post
I suspect a gauge issue or sensor issue. 1000 sounds a little high, 600 way low for a 330 running at 2400.

Are you monitoring charge air pressure (boost)? EGT and boost should track each other closely between twins at same load

Are your tachs accurate and you know engines are in fact sync'd?

What rpm do both engines reach at full power?

Normal on lots of engines for egt to rise a bit at part load. At full load there is lots of boost and so the excess air in the cylinder, beyond what is needed for combustion, rises on a percentage basis. So more air going out that was not involved in a burn.

Also some boats settle at slow planing speed and that raises load.

You should swap gauges. Then if no change swap probes. Hopefully that is possible without making a hash of your cable routing job.
The boat is underpropped. I can reach 3000rpm on a 2800rpm engine. There is absolutely no black smoke and in the 900 hours I have owned the boat, I have never seen black smoke nor absolutely no soot of any kind on the transom. Boost is relatively low and within 2psi of each other. Yep, I am going to switch wires at the gauge first. Switching probes would indeed make a "hash" of the installation. I think I might even just take out the probes and reinstall them to make sure they are seated or whatever...
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Old 08-16-2017, 10:51 AM   #22
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The boat is underpropped. I can reach 3000rpm on a 2800rpm engine. There is absolutely no black smoke and in the 900 hours I have owned the boat, I have never seen black smoke nor absolutely no soot of any kind on the transom. Boost is relatively low and within 2psi of each other. Yep, I am going to switch wires at the gauge first. Switching probes would indeed make a "hash" of the installation. I think I might even just take out the probes and reinstall them to make sure they are seated or whatever...

Does the high EGT engine have the low boost?

What are the boost and EGT readings at that rpm you had recorded?

The boat may be underpropped but if the gages are reading correctly we need to find the issue with the high EGT.
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Old 08-16-2017, 11:12 AM   #23
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Does the high EGT engine have the low boost?

What are the boost and EGT readings at that rpm you had recorded?

The boat may be underpropped but if the gages are reading correctly we need to find the issue with the high EGT.
Yes we do. The low boost is the low temp engine. Like I said....there are no other symptoms but I will get to the bottom of this. Headed to the boat now.
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Old 08-17-2017, 10:16 AM   #24
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Ok...went to the boat and started looking around. I realized there were fused plugs on the pyro probes that allowed me to switch probes quite easily. Took the boat out for a test ride....no change. So it isn't the probe. But while I had the floor torn up, I left it torn up to allow me to get some temperature readings with the laser thermometer gizmo. The temps on all "representative surfaces" were almost identical and matched the "cooler" gauge. The other gauge reads almost perfectly twice of the other one????

Anyway, will switch the wires at the actual gauge on the flybridge next. That probably won't happen until tomorrow or Saturday. The identical temp readings with the gun are giving me a little peace of mind. I realize that is not the exhaust flow. But if there is a 500 degree delta on the gauge and it were "real" I would assume I would see a significant delta on the temp readings..regardless of what the actual readings were.
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Old 08-17-2017, 10:26 AM   #25
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Really smart move using a infrared thermometer!
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Old 08-17-2017, 10:56 AM   #26
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At 2400 what are you reading for boost in psi?
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Old 08-17-2017, 11:27 AM   #27
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At 2400 what are you reading for boost in psi?
About 14psi on the port. About 12 on the starboard. Slightly low??? I needed to get the props tuned and did it about 3 months ago. I actually added an inch of pitch and probably could have done another. Before the addition, I would get damn near 3100. Now I am at 3000 +/- 25. The boat left the factory with 23x27. When I bought the boat the props had to be done and I was shooting in the dark(and with prop calculators). I went 23x24 to be conservative. I am at 23x25 now. I have never seen black smoke(I am sure I could force it) and have never had soot on the transom. The "inside" engine will load up in a turn and boost climbs about 3-4psi on that engine in the turn.
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Old 08-17-2017, 11:30 AM   #28
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Could they have sent me 1 24volt gauge and 1 12 volt gauge??? It is just bizarre that one gauge is almost exactly double of the other. I know the final answer will be when I switch the wires at the gauge.
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Old 08-17-2017, 01:38 PM   #29
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12 and 14psi means you are in a happy spot load wise. I would not worry about the 2psi differential, they are never exactly the same.
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Old 08-18-2017, 05:09 PM   #30
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Those x2 readings would be consistent with one sender being single-station and the other dual-station. Maybe check that....
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Old 08-18-2017, 06:55 PM   #31
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Ok...I realized there were fused plugs on the pyro probes that allowed me to switch probes quite easily. Took the boat out for a test ride....no change. So it isn't the probe.
Does this mean the 1000F reading stayed on the same gauge? If yes then it is a gauge problem not an engine problem.
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Old 08-18-2017, 07:11 PM   #32
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Those x2 readings would be consistent with one sender being single-station and the other dual-station. Maybe check that....
If that was the case the reading would have swapped when we swapped the probes(senders)
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Old 08-18-2017, 07:43 PM   #33
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Does this mean the 1000F reading stayed on the same gauge? If yes then it is a gauge problem not an engine problem.
Not really. Now if we switch the gauges(or wires to gauges) and the problem doesn't follows the wires, then it is the gauge. I'm having a hard time thinking it is an engine problem when the temps with the IR gun were almost identical.
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Old 08-23-2017, 08:14 PM   #34
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I have a pair of those same engines

A bit less than 900 is normal for my properly proper boat at a cruise of 2500

At displacement speeds I see about 600
I have the same boat and engines as Kevin and the same gauges.
We are propped slightly different, but I get the same results as Kevin

I have noticed one gauge needle "sticks" from time to time.
A tap on the glass and its where it needs to be.
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