How loud is an inboard diesel compared to an o/b?

[Igetit]

Trading into a Hunter 270 with the Yanmar GM series 9hp diesel. Should be getting possession of the boat next weekend, and am curious about a few things since this is my first inboard. I've been reading Don Casey's excellent text on sailboat maintenance, including the care and feeding of marine diesels. Can't recommend that book enough, to ANY sailboat owner.

Roughly speaking, when standing at the wheel, how much engine noise can I expect at idle and full throttle? The comparison is to an 8hp 2-stroke outboard on a 22 footer, where you are seated no further than the end of the tiller. (I'm hoping the inboard will be slightly quieter)

Thoughts?

 

[Ken13559]

The 1GM10 sound is of lower frequency and perhaps quieter to a 2-stroke obm. You may find vibration alittle higher, perhaps due to single cylinder of the 1GM10 or weak engine mount. It should be smoke free or alot less than the 2-stroke obm and you would have no problem when going through chops (prop won't get lifted out of water like the obm).

 

[Sail123]

To get the feel of a single piston diesel engine on a sailboat, one needs look no further than old reruns of Green Acres. That is the sound my memory brings back to me every time I listen to mine clatter away. One advantage is safety. Diesel fuel will not light with a match or spark.

If you already have a fire on board, and it is hot, diesel can get lit, but on average, much Safer fuel over gasoline.

Sound in the cabin is a lot louder than the sounds in the cockpit.

 

[Alan]

The level of sound you hear will be very much dependent on the quality and amount of sound proofing that you have around the engine compartment. Diesel engines are by nature noisy machines but the sound level can be greatly controlled. The big gains come with longevity and efficiency compared to gasoline powered engines not to mention the safety factor.

 

[Benny17441]

It depends on where your exaust port is at and wether it is above or below the waterline. The inboard diesel engine operates at lower RPM and the prop is well under the surface so the noise will be noticeably less.

 

[Igetit]

no problem when going through chops

Yes, and looking forward to not having to lean over the transom to pull it up!

look no further than old reruns of Green Acres

Actually, I'm old enough to remember that. Mr Haney's tractor, was it? Great reference!

on average, much safer fuel over gasoline

I look forwarding to pointing this out to The Admiral. "It's for your safety, dear!"

dependent on the quality and amount of sound proofing

Hey good point. If anybody has significantly improved on the OEM insulation, it could be a worthwhile mod.

depends on where your exaust port is

Another good point. I look forward to taking note of that, and making "blow hole is clear" a pre-ignition checklist item!

Thanks guys, I really appreciate all your help and insight!

 

[kjretlaw]

I just upgraded from a 27 with a 9.9 to a 32 with inboard diesel. Much quieter, eaiser to steer. No more cavitation in choppy seas.

Enjoy the new boat !!