1987 2850 Contessa won't plane

[stormkatman]

I just had surveyed this boat as I am wanting to buy it. I had the boat hauled and hull washed (it needed it). It hasn't been run since May of 2005. I have it running now. Cylinder compressions are as follows:<br /><br />1-118, 2-120, 3-125, 4-110, 5-120, 6-118, 7-118, and 8-116.<br /><br />It idles good but when I took it out to plane (4500 rpms) it would not! It was as if you were pulling a tank.<br /><br />Would appreciate your ideas and suggestions. The prop is OEM (15 1/2 x 17).

 

[msd58]

Re: 1987 2850 Contessa won't plane

It could be a # of different things. What is the top speed it runs now? The last time I saw something like this on my friends boat. Turned out was that the engine needed a tune up. Another words it was ignition oriented.

 

[magster65]

Re: 1987 2850 Contessa won't plane

Those aren't the best compression numbers I've seen but it could be the guage. They don't vary much so it's not all bad there. This is a 28' boat with a single? What engine and drive's in it?

 

[lilmandavis]

Re: 1987 2850 Contessa won't plane

ive got a 87 2850 and in about 15 secs im on plane with my 460 cobra with 6 ppl on it lol unfortantely i had to rebuild the engine when the cam decided to start grinding off lobes hope thats not your prob lol sucks when you pull off the intake and find push rods jumpin around like pretzels on a roller coaster about 30 miles an hour or so at 3800 rpms good thing im mechanical

 

[dpoelstra]

Re: 1987 2850 Contessa won't plane

If the engine runs to 4500 RPM, and stays running, the problem is not the engine. If the engine is turning the props, the props should be turning pretty fast. I would check the prop hub. may be spun, and the prop is not turning at the same speed of the engine. How fast is she moving at 4500 RPMs? My 85 2850 gets up on plane fast and doesn't even need full throttle do get there (twins). I cruse on plane easily at 3000 rpms (28 mph).

 

[NYBo]

Re: 1987 2850 Contessa won't plane

 

[dpoelstra]

Re: 1987 2850 Contessa won't plane

wow...I didn't even see that.

My bad...