I just repowered my 1988 C34 with a Beta Marine 25. Question for others that repowered with same engine: what do you have as a prop? Make and size?
Others: Anyone with a Gori 3 blade prop? What size and what engine do you have?
I still have the original 15x9 3 blade and very under propped right now. 5.5 knots at 3000. WOT goes to 3800 (engine is 25HP at 3600) and get 6.5 knots. I also have the TMC 40 transmission gear ratio 2.6.
Thanks
Can't help with your prop question but, I'm really curious how it compares to noise level and vibration vs the M25?
Quote from: Bill Shreeves on July 14, 2021, 02:25:11 PM
Can't help with your prop question but, I'm really curious how it compares to noise level and vibration vs the M25?
Me too Bill...I took a Db reading while out cruising. My M25XP 3 feet from the open companionway at 2500rpm I got 89Db. Seated behind the wheel I got 85Db. I get jealous when I hear other sailboats quiet hum of their engines.
QuoteMy M25XP 3 feet from the open companionway at 2500rpm I got 89Db. Seated behind the wheel I got 85Db.
I've never taken a Db reading on my MKll. Sure it's much less than that. Nothing special has been done just OEM insulation in good shape. I'm very happy with the sound level.
Jim
Guys : When I replaced my engine (M25XPB 26 HP) I replaced the engine compartment insulation (Mainsheet tech note article). I went with the 1.25" from Defender and found a notable drop in engine noise!!
A few thoughts