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Forum: Sport Yachts 09-14-2021, 12:11 AM
Replies: 26
Views: 4,058
Posted By SteveP
Go to boatdiesel.com or seaboard marine sbmar.com...

Go to boatdiesel.com or seaboard marine sbmar.com and search on 450 diamond. If you are not getting 2600 (preferably 2650+) you may be over propped, which puts more demand on the motors. This...
Forum: Sport Yachts 08-27-2021, 11:03 AM
Replies: 26
Views: 4,058
Posted By SteveP
For my boat the combined is a little less than 1...

For my boat the combined is a little less than 1 NM / gal at cruise. I get a little better at hull speeds.
Forum: Sport Yachts 08-22-2021, 03:56 PM
Replies: 26
Views: 4,058
Posted By SteveP
Boat is an 01. The motors were manufactured the...

Boat is an 01. The motors were manufactured the year prior (2000). I cruise at 2250 and get around 19 KTS.
Forum: Sport Yachts 08-22-2021, 03:52 PM
Replies: 26
Views: 4,058
Posted By SteveP
Mine are mechanical 6CTA (8.3L)

Mine are mechanical 6CTA (8.3L)
Forum: Sport Yachts 06-21-2021, 05:07 PM
Replies: 26
Views: 4,058
Posted By SteveP
As mentioned in previous posts you should see at...

As mentioned in previous posts you should see at least 2600 RPM (preferably higher). Speed at WOT for me is about 25 KTS. Something is holding your engines back and should be identified before the...
Forum: Sport Yachts 07-24-2020, 10:40 AM
Replies: 26
Views: 4,058
Posted By SteveP
Other than the pitch reduction the props are OEM...

Other than the pitch reduction the props are OEM for the 4600 with 450 Cummins. You should see a bit better than 14 kts at 22-2300. You should also check your Wide Open Throttle (WOT) RPM. As...
Forum: Sport Yachts 07-20-2020, 01:53 PM
Replies: 26
Views: 4,058
Posted By SteveP
When I purchased a spare set of props from CJR I...

When I purchased a spare set of props from CJR I asked for the original 24x22 Ultrascrew .75 props. For both sets the pitch is now down to 20.5. That gives me about 2650 WOT.
Forum: Sport Yachts 08-13-2019, 12:18 PM
Replies: 26
Views: 4,058
Posted By SteveP
If you can only make 2400 at WOT you may be over...

If you can only make 2400 at WOT you may be over propped. Search on the following 2 web sites and you'll get a lot of advice about reducing pitch on your props so the motors can achieve 2600+. The...
Forum: Sport Yachts 08-12-2019, 04:23 PM
Replies: 26
Views: 4,058
Posted By SteveP
I generally move my throttles firmly but not too...

I generally move my throttles firmly but not too fast up to about 23-2400. I'll then back off a bit as things stabilize. I also have boost/egt and it seems the egt is about 20 degrees lower if I'm...
Forum: Sport Yachts 08-11-2019, 03:27 PM
Replies: 26
Views: 4,058
Posted By SteveP
I have an 01 with the 450s. I easily get up on...

I have an 01 with the 450s. I easily get up on plane in less than 10 sec. We cruise around 2250 (19kts) and at that speed burn about .9 - 1 gallon per NM. Only changes we plan to make in the future...
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