Guys,

I am about to buy a Cigarette 42x 2010' model (in europe) with 700's with 110h (already paid the downpayment...). I have searched all the internet and have not been able to find a diagram/chart with revs/consumption figures/power output on the 700' motors.

A) Can anybody inform me what is the consumption per 500rpm, and where is it safe(r) to cruise it?
I want to know WOT and cruise figures at least!



B) Furthermore does anybody in the forum own similar cigarette? What is the WOT and cruise speed?
I will be running it in salt water, should I take any further precaution than one already does? I read all topic regarding reliability/problems with 700s' and realized they are fairly safe engines, with similar header problems as the 525s'. I had header problems even with my cummins (I owned a fountain 42 2009' with diesel cummins engines), every year or so I should change the mufflers, otherwise because of corrosion they would make a whole (I had this boat in a birth and not in dry dock)

I am not afraid for one day trips since I will be cleaning them everytime I get back with fresh water (the cig will be dry-docked), though in the summer, I normally take the boat for 20 days on the sea, where I would normally do 25-30 hours. The engines will be working everyday, so there will be no salt remaining in the headers and cause corrosion. Do you think it is doable, or 700s' need everyday to be washed?


I want the boat so much, but I am also so anxious in terms of reliability since there aren't many powerboats in the Med with supercharged Mercury engines

Thank you all

http://www.mercuryracing.com/sterndr...gines/700-sci/

I would plan on buying some Gen X headers soon or maybe even switch to Stainless Marine Manifolds for that much extended salt use.

Yes, what he said.

Stainless Marine is a fantastic product, and while not as attractive as full headers; they are much 'safer' over the long run given your environment and running conditions.

Also, I'd look to have seacocks installed so you can completely shut off the sea-water supply to the engines (while moored in the water) and flush the motors out with fresh water.
JUST DON'T FORGET TO OPEN them back up before you start the motors.

When you have the fresh water hose turned on, motor off; and seacock open, you will be flushing fresh water backwards out the drives. This would also be a good thing to start with before you close the seacock to flush the motor out.

This is what you suggest?

http://www.stainlessmarine.com/shop/...-built-to-fit/

Any drawbacks on those than GEN X ?

http://custommarine.com/headerapps/genxheaders.php


Any feedback on consumption figures?

Thank you for everything

[


Any feedback on consumption figures?

Thank you for everything[/QUOTE]

We have 700's in a similar size boat and average 1.2 mpg cruising at 55-60mph.

Does it need the high octane fuel or is it ok with the standard one?

http://www.mercuryracing.com/sterndr...gines/700-sci/

89 Octane

And consumption is a very difficult figure to come up with.
Modern one-two engine step hull boats can get between 1-3mpg when you stay out of boost (if equipped).

However, running 45mph in flat water vs. 3-4 footers in the ocean will yield TOTALLY different fuel consumption figures.

It's likely your boat is equipped with SmartCraft which can look at fuel consumption on the fly. This will be your best (and only) indicator.
Typical 'old boater' mentality:

1/3 tank to get there
1/3 tank to get back
1/3 tank in reserve

Last thought:
Remember, your fuel tank level (gas gauge) indicators are usually NOT linear in representation. The majority of boats have belly tanks which are V-shaped on the bottom. This essentially means when you get 1/4 tank on the fuel gauge, you need to know exactly where you next fuel stop is; and hopefully close by.

Thx Sydwayz.

I have run out of fuel in the past for the reason you mention...I had 1/4 in the gauges...I didn't do more than 20 miles.. . And there is nothing worse being in the middle of nowhere without fuel..!
From then on I count hours of running the engines with fuel, and try to figure out staff. I guess that it should +- 50-60 gallons at (quite high) cruise

1.5 MPG at 4000 rpm is probably close