Power issues

This forum is for owners and enthusiasts of the Sea Hawk line of Caravelle Boats. From the 190 Center Console model up to the 280 Center Console model.

Power issues

Postby drewerd » Thu Jan 22, 2015 2:28 am

I have a 2008- 230 walk around with a 5.0l, 220hp mercruiser. Does anyone have any tips to increase power or hole shot?
It is fitted with a standard aluminium 3 blade prop. The boat is a little slow to plane and I have some tricky bar crossings where I live in Australia and would like the boat to pop out of the water a bit quicker.
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Re: Power issues

Postby AndrewT » Thu Jan 22, 2015 7:52 am

I guess that it has a 21" pitch prop, if it does get a 19P 4 bladed prop preferably Stainless Steel, you'll sacrifice a bit of top speed but she'll plane a lot quicker and stay on the plane at a lower speed.
Welcome to the forum , good to see another ozzie member.
2005 Interceptor 212
Volvo 5.0 GXi 270hp
21P 14.5 3B SS prop and 19P 4B SS for wakeboarding and tubing.
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Re: Power issues

Postby drewerd » Thu Jan 22, 2015 7:35 pm

thanks andrew, yeah from Australia. Current living on the sunshine coast, previously from Townsville QLD.

the serial number on the prop is 78116A45P15 Mercury. I think that means its a 14 x 15"P?
does this means i have the completely incorrect sized prop?
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Re: Power issues

Postby shel » Thu Jan 22, 2015 10:02 pm

You need to make sure you have your rig propped right. RPM range on that motor is 4600-5000 rpms wot. Get on a straight piece of calm water, medium load and air it out. Your max rpms should top out close to the 5000 rpms with engine trimmed out. Your prop looks to be a 15" pitch, decreasing an inch of pitch (going down to 14") should get you approx an additional 200 rpms. Adding an inch of pitch (going up to 16" pitch, should make you lose approximately 200 rpms. Higher number pitch = slower acceleration. Lower number pitch = faster acceleration. That engine only puts out 260 hp, on that boat, it will never be a speed demon.
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Re: Power issues

Postby m_snow » Tue Jan 27, 2015 12:29 pm

Copy that on: go down a pitch (or two,) go 4 blade, and definitely DEFINITELY go stainless. If you hit your rev limiter (max rpm's) then your pitch is too low. (but you'll have a hell of a hole shot!)

GL!
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