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Re-powering Irwin 42 Center Cockpit

Dec 20, 2014
2
Irwin 42 Fort Myers
I'm in the process of restoring a 1976 Irwin 42 Center Cockpit and planning to re-power with an Yanmar engine. My understanding is that the boat originally came with Perkins 4106 engines (approx 48 hp) and that they were a bit under powered. I understand many upgraded to the 4236 (75 hp). I want to install a Yanmar and would like to get some advice on best horse power. I've seen some 55 hp Yanmar for sale, but concerned that may not be quite enough power. Should I be focusing on 65 or 75 hp engines?

I plan to be a full time cruiser once the restoration is done.

Thanks in advance for everyone's input.

Steve
 

malyea

.
Dec 15, 2009
236
'87 Irwin 43 Sea Breeze
I'm interested in your repower efforts since I close this week on a new to me 1987 Irwin 43 center cockpit that was repowered 6 years ago with a Yanmar 4JH4-TE, 75 hp. Sea trial showed 8.4 kts at 3000 rpm and the PO estimates she gets 6+ kts at 2500 rpm while burning estimated 3/4 gph.
 
Dec 20, 2014
2
Irwin 42 Fort Myers
Malyea...... from what I have read, I think you have the hit the sweet spot with engine HP. 75 HP seems to be the right size for these boats. Steve
 

malyea

.
Dec 15, 2009
236
'87 Irwin 43 Sea Breeze
Well, unfortunately she's in NC and we're in GA - going to see her for the weekend coming up... First time aboard since we closed - but we both love her, planning significant upgrades and then an offshore delivery this fall to St Augustine. From there....bring me that horizon;-)
 
Dec 7, 2012
515
Kittiwake 23, Irwin 43 .. Indianapolis / indianatown, fl
hello all

I just purchased a 1977 Irwin 43 aft cockpit staysail ketch... it has a perkins 4-154 62 hp engine in it.... does 8 knots at 2500 rpms and burns 3/4 gph... good engine...

sincerely
Jess