Cruising Speed

I thought return also for cooling and avoiding vapor lock.
 
quote:
Originally posted by pdecat

I thought return also for cooling and avoiding vapor lock.

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I agree a return line prevents/helps both of these issues. I have a very high regard for Crusader Engines so I can only think that these issues are handled some other way?
 
I always thought that I was good enough to take any boat, drive it for an hour, and could tell where the sweet spot was.
I was really wrong. I installed the Northstar fuel management system a few years ago, and it has showed me that these newer electronic engines are not the same as the old carbureted engines.
Northstar inputs speed over ground, and takes the gallons per hour, and computes this into an economy reading. The higher the reading, the better you are doing. Gallons per hour is not enough.
Wind changes everything. What works today, may not work tomorrow.
In my case, I run anywhere from 3800 to 4000 rpm, and obtain my best fuel economy, running 8.1 fuel injected big blocks. Trim tabs all the way down, and outdrives trimmed up as far as possible, without cavitating.
This rpm usually lets me run 35 to 38 mph, and the boat is very comfortable at that speed.
I am averaging 1.3 mpg at this speed, which I feel is excellent for a 20k boat with a hardtop.
 
Garry
that's great numbers, the real deep V your Formula requires a bunch of HP to push it unlike flatter hulls and it sound like you have it tuned in right
 
My modern injected motors have the no return option as well.
YES Mike (Hogan) I think I have heard this B4!
Bill
 
Am I the only one that ignores GPH and flow scans and instead focuses on comfort? My correct cruising speed, as per the OP, is the one that is most comfortable as measured against the current conditions and people on board.
 
quote:
Originally posted by Gregory S

Liz, i find my fuel flow meter to be extremely accurate. Are you talking about fuel gauges or fuel flow meters?
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I was a seat of your pants skipper. My boat [single engine Alpha II] had no fuel flow meter. Actually the fuel gauge on my last boat was surprisingly consistant, so over time I knew when it was time to head to the fuel dock. Other boats were not.
 
quote:
Originally posted by abalmuth

Well it just shows that you can learn something new everyday.
Now i have a Internet search prodject for any spare time this week to figure out the details

Sandy
When you did your re-power I assume that it included new electric fuel pumps?
If so are they installed in the tank(s)? 
Are the fuel pressure regulators electronically controlled or vacuum ?

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Yes , the MPI's have LP & HP electric fuel pumps on the engine. I believe the fuel pressure regulator is mounted on an engine fuel pipe just about where it feeds the 2 fuel rails to the injectors. It's a mechanical spring-loaded flow-diverter valve device AFIK .

No wires to it and there is definitely nothing added to the fuel tank from when it had the carbed engines, and I don't know of any marine system that places pump or regulator in the tank. . Could your cut & paste description by any chance have been referring to car & truck injection systems that routinely employ fuel pumps and filters in the tank?
 
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