Pretty Much Loaded And Ready To Go... Again

[Passages]

I'm thinking the tachs are off. Any chance there's a phototach buried in the tool chest?

[Freeebird]

I'm thinking the tachs are off. Any chance there's a phototach buried in the tool chest?

Nope, but if these tachs are off by 20%, it would certainly answer a lot of questions.

[Boatsb]

If the surveyor used the dash tachs shame on him. I think the sound is a good clue and also the poor thrust at idle. It got small props.

I though the 53 had larger diameter props that 26. Is there a pic of the running gear? It should have the props in relation to the hull in a pic on the survey.

[rsmith]

Nope, but if these tachs are off by 20%, it would certainly answer a lot of questions.

Except in your videos the engines sound like their turning 1800. Guess you’ll find out when you run out of fuel in the middle of the lake.

[Freeebird]

Gauges on the tanks showed above 3/4 which would be about right from full for our run. Besides, being towed saves money.

[Pascal]

8V71Ns are rated at 2300. What kind of surveyor reported 3000rpm and didn’t raise the issue ????
At the very least he should have known whether the tachs were good or not just by ear and should have recommended checking the tachs.

You can not trust the fuel gauges. The only way to be sure is to unscrew the gauges and stick the tanks. Critical on these boats is that the tank shapes will cause the gauge (and dip sticks) to read high. A few months ago I posted a picture of my calibrated dipstick for the forward tank on this thread :

https://www.samsmarine.com/forums/sh...ght=Stick+tank

[Freeebird]

With 600 gallons, I’m not too worried about running ~280 miles. We’ll top the tanks in the morning at Racine.

[Freeebird]

Unless we run out of fuel in the next 90 minutes, we’re good. Super flat conditions let the old gal pick up a little speed. Pics later.

[oscarvan]

At the risk of telling you something you know..... Fluorescent lights actually strobe at 120 cycles per second. So with shore power, one of those fluorescent shop lights and a piece of white tape radially attached to the fly wheel 4 radial stripes, 90º apart, will appear at 1800 RPM........Not the most accurate thing, but it will tell you if you're waaaay off, and then set the engine to approximately 1800 rpm and read the tach.

http://pages.suddenlink.net/kmielen/C320Docs/Tach.htm

[oscarvan]

And as I'm Googling around on the subject I came across this....

In the Pro “Sled Pulls” for Pro-Semi Class, we turned the V12 (71 series) at 4,100 to 4,200 under full load for years, and never blew it up.

Just another data point......