One Engine louder

[Augieol65]

Anyone else have this issue? My starboard engine at idle and no wake is significantly louder than my port. The impeller has some nicks in the leading edge but very small. Wear ring doesn’t appear swollen or damaged. I can’t even tell the port engine is running below 2000 rpm but the starboard is significantly louder. Changed spark plugs the beginning of this season. Any ideas? Thanks!

 

[Dixie Highway]

Check the connections to the exhaust/water box on that side.

 

[Augieol65]

I’ll take a look at those again. Large black rubber hoses coming off engine through transom? I checked black straps/thick bungee like tie downs on big metal drum looking things under the swim platform those seemed good. Sorry don’t know all the names of these parts. Did order another impeller incase it’s pump noise but I’d be blown away if that little song causes that much cavitation. Noise between the engines seems the same above no wake.

 

[Augieol65]

Do you think I should just change the plugs again? I put them in at the start of this season and the port engine is fine and got them at the same time. Maybe this is just normal

 

[Dixie Highway]

I guess it depends what you mean by “louder”? If you mean it sounds just like the other engine but increased volume, then I’d check exhaust again. But if you mean it’s also rougher, then maybe plugs but I can’t imagine plugs only a few months old would be shot already. I’ve been shocked before though.

 

[Augieol65]

I’d say more rumble. My guess would be cavitation. Port impeller is pristine so I’ll replace the starboard and have it redone and see if that minor nick causes that much of a difference.

 

[Dixie Highway]

Usually cavitation would be more akin to having a slipping clutch in a vehicle, revving engine but the impeller “slipping” in the water not grabbing on to anything.

 

[Augieol65]

What’s my thought. Checking sealant under the boat in the water today

 

[Wiremanmike]

Mine has been that way for the 10 years I've owned it. Never figured out why

 

[Augieol65]

Hahah maybe it’s a slight difference but today and the past few hasn’t been bad I’d noticeable very much but glad I’m not going crazy and it’s definitely a thing