99 Cobalt 5.0lGi Volvo Penta, Duo Prop Slow take off.

[ceheinzm]

I have a 1999 Cobalt 190, 5.0lGi, 1.95 DPSM Duo Prop outdrive with F6 props. The boat will do 55mph or better once it's wound up, but I struggle pulling even a moderate sized skier on 2 skis out of the hole. Do I have the right props? Could it be a timing or fuel problem? I expect that 5.0l to really jump that 19' boat out of the water when I hammer it, but it's a dog off the line. It starts easy, idles smooth and really flies at the top end. Any help is really appreciated.

 

[Don S]

Re: 99 Cobalt 5.0lGi Volvo Penta, Duo Prop Slow take off.

What is your max WOT rpm? That is what you need to determine proper sized props,

 

[jestor68]

Re: 99 Cobalt 5.0lGi Volvo Penta, Duo Prop Slow take off.

For a reference point, the WOT rpm operating range is 4600-5000 rpm.

Propping it to run at or near the top of the range will produce the best acceleration out of the hole.

 

[doyall]

Re: 99 Cobalt 5.0lGi Volvo Penta, Duo Prop Slow take off.

I would think you need to check your WOT RPM with the boat fully (or at least normally) loaded. Much more realistic parameters.