Hey,

This article (goodoldboat.com/cool-quiet-and-trouble-free-exhaust/) states that a scoop on the raw water inlet may lead to flooding of the engine when sailing due to the fact that "Six knots produces about 19 inches of water column pressure".

Anyone had any problems with this? I've just had new engine installed. Have motored but not sailed yet. Noticed the manual states that they should never be used, yet the installer didn't think it was an issue.

Cheers,

Roger

Thx Ramona. Scoop was existing from previous install (which was a drofin 12, which did have seawater ingress but of cause unknown).

Yes, seems I will have to turn off seacock under sail and back on when I need the engine, which is a bit trickier short handed. Is it right to assume that it would be preferable to run the (heat exchanged) engine for a minute without water rather than have a minute of sailing with seacock on and engine off (when switching from power to sail)? So on mooring: seacock on, start engine, raise sails, seacock off, engine off. Back to mooring: engine on, seacock on, douse sails. Sound okay if it's 30 seconds to a minute?

As a person new to sailing and to boat ownership, it really pisses me off that mechanics and "shipwrights" either don't know basic stuff or don't care. Yes, I know that I'm the skipper / owner and I'm responsible but I don't yet have all this knowledge and I have expected other people with knowledge to do the right thing. She was up on the hard for 10 days for the install (much of that waiting for parts) so there was plenty of time to do a job like this. And it would have made them money - they certainly can't be blamed for hard selling! /end rant

Anyway, I'm glad to have this and other forums and also the god-send, This Old Boat.

Don't really have this problem as I have a heat exchanger on my Nanni

But, you should turn your seacock on; then start your motor/turn it off, then turn the seacock off.

Why, because you will run the impellor dry without the seacock open and that will ruin the seal and it won't work!