Hello well I was looking for some information and to share some info.
135 Hp hinos with 630a hurth that I installed a few years back.
As several members know after I replaced my 360A Hurth Gear boxes to Hurth 630A hydraulic transmission my performance levels have dropped as it takes 15 hp to run then and in later Motor Yacht you see the 15hp upgrades in the 150hp engines.
To get to my 3000 rpm levels I re pitched the Nakashima props. I had them repitch an was able to reach 2800 Rpm max
The prop shop informed me that they could not re pitch the Nakashima's any lower so I switch to a new prop.
I am running a Michigan Wheel 4 blade DQX skewered blade 17 dia 14.1 pitch on the port motor and 13.8 pitch on the starboard. I can reach 3000 Rpm with this configuration.
With my RIB on the platform with 15 hp outboard motor and gear I am still a little short on rpms. Now I turn
about 2950 rpm max fully loaded so I know I am still a little under propped probably about 3/10 or . 3 I think this fall when i pull I will repitch. To 13.8 port & 13.5 starboard. I know I am pretty close.
This year I install 1/2 plastic spacers on the trim taps this has made a positive improvement. I am cruising at 2600 Rpm @14knts@ 1050 EGT. My exhaust gas sensors are pre turbo. I think if I drop the pitch this will also help my EGT. My dream is 950 degrees. I have up graded all my coolant lines on my turbo to 5/8 Id when I switched to silicone hoses.
I think I might also interested in a aftermarket after cooler if you can recommend where to start on this.
Thanks for your time. I am very interested as to what you folks think.
Sincerely Roger
Fair Winds and Following Seas
135 Hp hinos with 630a hurth that I installed a few years back.
As several members know after I replaced my 360A Hurth Gear boxes to Hurth 630A hydraulic transmission my performance levels have dropped as it takes 15 hp to run then and in later Motor Yacht you see the 15hp upgrades in the 150hp engines.
To get to my 3000 rpm levels I re pitched the Nakashima props. I had them repitch an was able to reach 2800 Rpm max
The prop shop informed me that they could not re pitch the Nakashima's any lower so I switch to a new prop.
I am running a Michigan Wheel 4 blade DQX skewered blade 17 dia 14.1 pitch on the port motor and 13.8 pitch on the starboard. I can reach 3000 Rpm with this configuration.
With my RIB on the platform with 15 hp outboard motor and gear I am still a little short on rpms. Now I turn
about 2950 rpm max fully loaded so I know I am still a little under propped probably about 3/10 or . 3 I think this fall when i pull I will repitch. To 13.8 port & 13.5 starboard. I know I am pretty close.
This year I install 1/2 plastic spacers on the trim taps this has made a positive improvement. I am cruising at 2600 Rpm @14knts@ 1050 EGT. My exhaust gas sensors are pre turbo. I think if I drop the pitch this will also help my EGT. My dream is 950 degrees. I have up graded all my coolant lines on my turbo to 5/8 Id when I switched to silicone hoses.
I think I might also interested in a aftermarket after cooler if you can recommend where to start on this.
Thanks for your time. I am very interested as to what you folks think.
Sincerely Roger
Fair Winds and Following Seas
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