1986 52' Convertable

[Bordaddy]

What should be the Top speed and normal cruise speed for her. She is powered with Twin 8V-92 Detroits 650 HP Each and what could you expect on fuel use at cruise speed.

[miker29]

What should be the Top speed and normal cruise speed for her. She is powered with Twin 8V-92 Detroits 650 HP Each and what could you expect on fuel use at cruise speed.

No turbos? I am a 1990 with 8V92s - 735HP each with turbos - cruise is 65 gallon/hour at about 18-20 knots - WOT with wind at back 24-25 knots.

[thoward]

These are average numbers, the load can pull it up or down a knot.
17 knots at 1850
19 knots at 2000
23 knots at WOT

2.5-3 gal/mile cruise
1 gal/ mile hull speed

[Regal2800]

i also have the same boat, numbers posted above are about what i am getting as well.

[Regal2800]

sorry to side track, but when you guys cold start the 8v92 how many seconds of white smoke do you get before they clear up and how many hours on the motors?

[saltshaker]

sorry to side track, but when you guys cold start the 8v92 how many seconds of white smoke do you get before they clear up and how many hours on the motors?
A lot depends on how cold it is and how cold the block is. In the summer there is little to no smoke. When it dips down in the 40's and 50's, they may smoke for 10-15 sec before clearing up.