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https://www.flickr.com/photos/55428883@N04/sets/72157642644018403/ Here is a link to some photos of Portola, photos of the engine are in there. Air start, direct reversing, built in 1929. In the 1970's we dropped a Cat 3208 in it, on a separate shaft to assist in maneuvering since the direct...

Thanks Andy, enlightening and funny!

What is your speed at cruising and WOT?

You are right. This is another boat my family has, the "Portola". It has the original 600 RPM @ WOT Winton diesel with no gear box. She is 85 tons and cruises at 9 knots, check out the prop, insane pitch and hardly any diameter. The feathering prop on the right is just a come-home.

Interesting, didn't know that. Based on the prop sizes from other members seen here, the engine should run up to 2,400 no problem with that size prop. I wonder about the reduction gear now....

The BW transmission is a 2:1 according to the serial tag (I am finding this is typical for this set-up on this boat). A phototach would be good. I will try to find one this week and give it a shot one evening this week and post the findings here. You are right that I should confirm this...

Photos

Alright guys, here's the latest. Again this is with the 3 blade, Michigan, 24x16. The boat weight is ~23,000lbs. She is semi displacement and 36'. This weekend we went out to test the cruising speed and WOT speed. WOT RMP is only 1,900!! This was confirmed with a mechanical SW tach on the...

Well said I think you are right. The engine is running too hot as well.

Well its done... The IG is mine now, so I hope that its a simple solution, otherwise I will just run it at 1600 to keep the load down. Also, not that is does much for information, but here is a video of that day, of the boat and engine room. I just happened to have them so I thought I'd...

Everything was clean, and the twin engine IG's, same hull with twin 275hp Volvo's in them can reach a max speed of 16 knots. Not at all what I'm looking for but because it is semi-displacement it is capable of planning given enough hp. What is strange is that the three blade that I mentioned in...

Rec to reducte prop size I have been told by several mechanics over the years that RPM's will not hurt your engine as long as they fall within the safe operable limits recommended by the manufacturer. LOAD is what can reduce the life of an engine (gas or diesel). Overloading and engine so it...

I have a 36' Island Gypsy Europa with a 120hp Lehman (2715e). It has a Warner gear box, 2:1. I have tried two different size props. Prop #1, a 24x17 four blade Michigan only allowed the boat to turn up to ~1900 RPM (8.5 knots) at wide open throttle (WOT). I switched it out that day in the yard...