Indmar Raptor 400 Engine Whine 1000rpm

[raffracing]

I have a 2018 Craz and from day one it has had this high pitch whine at 1000rpm and seems to only happen moving forward. Video Below: Starts right around 9 seconds in you will hear the sound come as the boat gets to 1000rpm. Haven't noticed it in reverse. Boat now has 17 hours on it and it hasn't gone away. Dealer initially said just keep an eye on it but now I have it back with them for the 20 hour service and I've asked them to help resolve the whining noise. It is pretty high pitch and really irritating. It's right at the almost ideal no wake speed! Almost sounds like a harmonic resonance type sound.

Has anyone else had this on their boat? Any ideas of what to go after? I was thinking maybe shaft alignment but I'm not sure. Salesman said he heard it during another demo on a Craz Pro they sold recently too but the service department said they hadn't heard of this before. I'm in no way doubting their skills and they hopefully will figure it out! But I thought I'd ask here too and see if anyone else had this happen so we can pinpoint it faster.

I probably should have taken the video with the engine compartment closed to muffle some of the normal engine noise.

https://www.youtube.com/watch?v=XUBF49wBf2o

[dakota4ce]

My new 450 (460) whines a little bit like that. But it doesn’t strike me as something wrong. Must not be as severe as yours?


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[raffracing]

It's pretty obnoxious. I don't expect the boat to be quiet like a luxury sedan... but this doesn't seem normal. It gets pretty loud. The video almost doesn't do it justice.

[larry_arizona]

That does seem loud.

I got the 400 in an 18SA and last night the wife asked how fast it would go, even at 5300rpm, 38-39mph, it was pretty darn quiet.

My point is, the Raptors are very quiet


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[korey]

Mine does NOT sound like that...

Check alignment.

[dakota4ce]

I re-listened. When you throttle back up it’s plain to hear. That seems loud.


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[dakota4ce]

That does seem loud.

I got the 400 in an 18SA and last night the wife asked how fast it would go, even at 5300rpm, 38-39mph, it was pretty darn quiet.

My point is, the Raptors are very quiet


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My experiences in the realm of VDrive inboard motors, Raptors are actually not very quiet. The GM based motors seem to be quite a bit quieter. At least to my ears.


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[larry_arizona]

Have not heard a GM V drive boat to compare.

But very familiar with LS engines and other than loud valve trains they are otherwise quiet.

It’s very possible that in a Supra (more sound deadening ??) along with a surf pipe adds to the quietness of the Raptor?


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[dakota4ce]

They (Raptors) aren’t loud, but GMs are quieter. In boats. Typically.


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[dakota4ce]

Have not heard a GM V drive boat to compare.

But very familiar with LS engines and other than loud valve trains they are otherwise quiet.

It’s very possible that in a Supra (more sound deadening ??) along with a surf pipe adds to the quietness of the Raptor?


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There’s really not much in the way of “sound deadening” that I am aware of. Just fiberglass panels and upholstered stuff. I have dynamatted my boats lately—a 2016 SE and now Makai. Makes a nice difference.

Point here is—the OP seems to have a. Unusual noise worth checking into.


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[That Guy]

There’s really not much in the way of “sound deadening” that I am aware of. Just fiberglass panels and upholstered stuff. I have dynamatted my boats lately—a 2016 SE and now Makai. Makes a nice difference.

Point here is—the OP seems to have a. Unusual noise worth checking into.


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You have a makai ?!? How did I miss the post with pictures?

[jmvotto]

They (Raptors) aren’t loud, but GMs are quieter. In boats. Typically.


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I agree with that

[raffracing]

I believe what I am hearing is "Prop Sing" The dealer serviced the boat and couldn't find any issues. They also weren't able to recreate the sound with the boat out of the water. I took the boat out yesterday and spent a lot of time crawling around it while it was making the noise. It is definitely a harmonic resonance type sound and that got me searching for prop harmonic noises. It sounds like others have encountered Prop Sing and there are some fixes such as filing the trailing edge of the prop. I'm not about to take a file to my brand new boat! But I do have a call into OJ Props. I just missed them today but I'll be calling them to learn more tomorrow. Hopefully between them and my dealer, we'll get it sorted out! I'll keep you posted on what I find.

[larry_arizona]

I believe what I am hearing is "Prop Sing" The dealer serviced the boat and couldn't find any issues. They also weren't able to recreate the sound with the boat out of the water. I took the boat out yesterday and spent a lot of time crawling around it while it was making the noise. It is definitely a harmonic resonance type sound and that got me searching for prop harmonic noises. It sounds like others have encountered Prop Sing and there are some fixes such as filing the trailing edge of the prop. I'm not about to take a file to my brand new boat! But I do have a call into OJ Props. I just missed them today but I'll be calling them to learn more tomorrow. Hopefully between them and my dealer, we'll get it sorted out! I'll keep you posted on what I find.

Oh geez, I had no idea that video was not in the water.


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[dakota4ce]

Wait—-you were turning the prop (in gear) out of the water?


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[raffracing]

NO- The boat was IN the water in the video. I was saying the dealer couldn't recreate the noise with the boat out of the water (On their fake a lake). I've never run it out of the water.

[dakota4ce]

So you have a noise that you’ve observed occurs only when you’re moving forward in the water, you take it to your dealer and they don’t even drive it in the water? I don’t get it.


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[larry_arizona]

Agree, your dealers analysis is confusing.


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[raffracing]

Just got of the phone with OJ Props. They were aware and confirmed they had an issue with the 945 15x13 prop singing and they will be exchanging mine for the updated prop. Problem solved!

[korey]

WOW!

I had a little noise started with my boat at about 60 hours. I was really concerned with it since it changed so drastically one day, so I took it to my dealer (actually met them on the water to look at it since they're awesome like that, which ended up with me spending most of the day on a '19 SE550). I thought it might be transmission related...

Leon got in the boat and we romped around in it a little and he told me he thought I had a prop problem. I was more than a little skeptical - I had looked the prop over several times, and I've destroyed a few in my day - I know what a prop problem looks like. A little bit out of spite, a little bit out of wanting to save a big family weekend, and a little bit out of curiosity to change pitches I ordered an Acme 1235. Noise COMPLETELY gone. There isn't a single mark on the OJ 945 that I pulled off, but the noise went away with the change! Strange that the noise started overnight. Maybe it is bent in a way that you cant see with the naked eye like an entire blade tweaked a little. I wander if they;ll replace mine. After surfing a whole day with the Acme, i do really need the lower pitch of the OJ945.

I've never had a problem with an Acme prop, and this is my second OJ that I found a reason to dislike.

[DaveM]

I have your exact boat, 2018 Craz, and I too have the whine, but mine is at a higher rpm. Mine is around 2,500-3,000 rpm. It's the transmission gears, not the engine. My dealer says its normal. A friend has a new Malibu, and his has the same whine but at a lower rpm. I ended up installing some additional sound deadening material and that helped a lot. Costs about $100 and comes in sheets. Don't fret, there is nothing wrong. My dealer and other online comments say its the type of gears in that transmission.

[raffracing]

I'm a little slow to respond but we finally have it resolved! Dealer swapped out my OJ prop for an ACME 2775. ALL NOISE GONE! Only noises that remain are the normal transmission gear noises like DaveM states. There was definitely something wrong with the original prop. Super high pitch harmonic noise that was super irritating. All gone now and happy to have an awesome dealer helping make sure I'm taken care of.

[Farmerdes]

Thanks Raffracing, I have just had delivery of a Makai, and it's got exactly the same prop, with the same noise!

[jcarter20]

Wow! I have a 2018 Craz with the same problem. I have never heard it was a prop issue. So OJ send you another prop and did it work, or did you just use the ACME that the dealer gave you. I agree, it was annoying as hell because it was at optimum idol speed when everything was quiter. I have been happy with my OJ for wakeboarding and surfing, so I don’t want to lose performance by switching props. However, if I can make the noise go away, I will!


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[jcarter20]

WOW!

I had a little noise started with my boat at about 60 hours. I was really concerned with it since it changed so drastically one day, so I took it to my dealer (actually met them on the water to look at it since they're awesome like that, which ended up with me spending most of the day on a '19 SE550). I thought it might be transmission related...

Leon got in the boat and we romped around in it a little and he told me he thought I had a prop problem. I was more than a little skeptical - I had looked the prop over several times, and I've destroyed a few in my day - I know what a prop problem looks like. A little bit out of spite, a little bit out of wanting to save a big family weekend, and a little bit out of curiosity to change pitches I ordered an Acme 1235. Noise COMPLETELY gone. There isn't a single mark on the OJ 945 that I pulled off, but the noise went away with the change! Strange that the noise started overnight. Maybe it is bent in a way that you cant see with the naked eye like an entire blade tweaked a little. I wander if they;ll replace mine. After surfing a whole day with the Acme, i do really need the lower pitch of the OJ945.

I've never had a problem with an Acme prop, and this is my second OJ that I found a reason to dislike.

How does your Acme 1235 compare to the OJ 935? I saw in another thread someone recommended an ACME 2315. I guess I need to do my own research, but I don’t want to loose the performance of the “wake prop” that I paid an upgrade for when I ordered the boat. To many different numbers out there!


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[korey]

How does your Acme 1235 compare to the OJ 935? I saw in another thread someone recommended an ACME 2315. I guess I need to do my own research, but I don’t want to loose the performance of the “wake prop” that I paid an upgrade for when I ordered the boat. To many different numbers out there!


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After putting a few dozen hours on the Acme 1235 I believe that it runs slightly smoother, quieter, and efficient than the factory "surf" upgrade OJ 935. But only slightly. After running heavily weighted, I want the pitch of the 935 back. I'm having it looked at by a prop shop this winter.