Re: 27 project
Those 4LH series diesels were by some accounts the best small mechanical diesels ever made. Sadly, Yanmar no longer produces them due to emissions restrictions. I had a single 4LH-STE in my Fortier 26 and it was an outstanding engine. In my new Fortier 26 I have a 6LP-DTE, which is rated for 250hp and has 6 as opposed to the 4LH's 4 cylinders yet the 4LH pushed an identical boat about 2 knots faster at wide open.
Yanmar does however make a series of smaller, lighter and probably better performing diesels now that would be far better in your proposed I/O setup then the 4LH's would have been.
The 4BY and 6BY engines are both pretty impressive packages. I also woulden't discount the Volvo D-3 series as they too are lightweight high performance diesels.
They are all great, except for the price tags that go with them ! For that reason, maybe look into repowering with a single, yet more powerful engine.
Awesome project you are undertaking. I can't wait for when you start grinding and glassing part !
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2002 26 Fortier Yanmar 250 6LP-DTE
1978 20 Sea Craft Master Angler 08' 150 ETEC
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