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Low hour Bravo XR blows after on propshaft dyno

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Low hour Bravo XR blows after on propshaft dyno

Old 08-04-2020, 09:20 AM
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Default Low hour Bravo XR blows after on propshaft dyno

So I took my 2001 Formula 292 with single Innovation Marine 496 to a shop near me ( I donít want to name the place at this time) For them to diagnose my low power issue below 2800 rpms. They hook it up to the propshaft dyno and tell me they do see that something is taking away power for some reason, but they cannot read the computer because of it being an Innovation Marine computer program. They tried working with Innovation and decided to replace 6 sensors on the engine. Anyways after having the boat for close to 2 months, they call and say it is finished and running good. I pay a $1700.00 bill and take the boat out the next weekend. The same issue is still there, canít turn a 24 pitch Hydromotive prop past 2500 rpm, the engine is powerless. So Put back on my 25 Bravo FS and spin it to 5500-5600 rpm and the drive blows within a couple minutes. The lower has a cracked case and leaking oil, no engagement, got towed in. My question is, can these propshaft dynos put enough strain and stress on a good drive that it can hurt the drive? My drive fluid was perfect before I took it to the shop. They said they did multiple WOT pulls and testing. My engine is somewhere in the 500 horse range maybe 575 tops. Drive has around 200 hours on it.
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Old 08-04-2020, 09:23 AM
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What drive?
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Old 08-04-2020, 09:25 AM
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read the title
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Old 08-04-2020, 09:31 AM
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Your drive was likely hurt before they even Dyno'd it. Using the propshaft dyno didn't cause your problems.
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Old 08-04-2020, 09:42 AM
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Unfortunately XR's can go at any moment...
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Old 08-04-2020, 09:49 AM
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Originally Posted by F-2 Speedy View Post
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Lol. Was driving and missed that part.

Usually it's the gears that fail but anything is possible I suppose. I'm thinking it may be the prop if you changed and spun the other with no problem.
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Old 08-04-2020, 09:50 AM
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It sounds like you were loading it kind of hard with the Hydro prop. (probably harder than the dyno) Have you run that prop before?
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Old 08-04-2020, 09:56 AM
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really makes no sense, you go up in pitch and pickup 2500 rev's.......might be something wrong with the 24
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Old 08-04-2020, 10:21 AM
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I have run the Hydromotive before. It was a cool day with very light load and at first it was hard to turn The prop but the engine finally took off and spun the Hydro to 5300-5400 rpm low 70ís mph. This time I had full tank of fuel and it wouldnít spin it past 2500. There seems to be an issue with the engine not making power under 2800 rpm. Once the engine reaches 2800 rpm it takes off and screems. The only way I can get it to reach 2800 is with a prop that slips enough. Iíve tried numerous props. 26 Bravo acts similar to the 24 Hydromotive in rpm and speed. But itís hard to get it to the 2800.... thatís why I took it to the shop.
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Old 08-04-2020, 10:23 AM
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Iíve also worked with Bblades and their testing program. Couldnít spin a 26 5speed then tried a 24 5speed which acted very similar to the 24 Hydromotive P5x.
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