Alumacraft top end

I have a 2006 Alumacraft dominator 175 sport with a 2007 150 salt water edition e tech and the hole shot seems doggy and I am only getting 45 mph out of it. I have a 20 pitch raker prop and the motor is mounted in the third hole. My RPMs are only at 4950 to 5100 would you recommend changing the prop pitch or trying it in a higher mounting position?

[REW]

T eyes,
Pick up a half dozen different props of different pitchs and try them all.

Theory is fine, but on the water testing is the final test.

Get a 19,18,17,16 and 15 pithc prop and try them all.

Of course you want to have a prop that fits your motor with the correct diameter for your rig.

You really should be able to pull the 20 pitch raker at 5800 or so with speeds near or over 50 mph with your motor.

But, try the opther props and see what you get for performance.

There is a possibility that you may have a motor issue so that you are not getting full power from your engine.

Are you sure that the engine throttle is opening all of the way when you advance the throttle lever.

Take care
REW

[Runaway]

Motor should be propped to 5500 - 5700 rpms. Again the www.etecownersgroup.com is an excellent source of information. However; you will need your Model # and serial # so the experts can further assist you should you check the site out.

[Winnie]

Here is a link to a Performance Test from the Alumacraft web site with your exact boat and motor. They got 52 mph with a 14.75x19" BRP Viper mounted in the second hole at 5400 RPM. Now there was a 15 mph wind during the test, so I don't know if they achieved top end with the full 15 mph at their backs, but 52 is pretty good.

http://alumacraft.com/images/stories...75-Etec150.pdf

Move motor up to 2nd hole. Should improve performance and then try out some different props. We have 19 and 21 pitch on a few of ours and they are running great.

[teamod]

I'd say try a new prop before anything! I have a 2010 150 on a Tournament Sport 185 and with the s.s. 19 pitch it pushes it @ 44-46 depending on how its loaded! I also have the motor in the second hole.

[seahorse]

The Raker prop is funny. It works great on some hulls but performs terribly on others.

Hot and muggy summer weather also saps power out of internal combustion engines compared to a cooler dry day.

Here is the Evinrude factory test bulletin using a 19" Viper prop with the motor on the second hole, 49.3 mph:

http://www.evinrude.com/Content/Pdf/...orts/PE407.pdf

I have a 2006 Alumacraft Navigator 185 Sport with 2007 ETEC Saltwater 150. With Raker 20 it runs 52MPH GPS at 5600 RPM. With alum. 19 pitch OMC it will run 48 GPS 5700RPM. I am mounted in the bottom hole (motor as high as it can go) and have added electric downriggers and 9.9 Johnson kicker. You have to pitch down to reach the required RPM, or raise motor to do the same. I guarantee when it is running at the recommended RPM it will move and be very responsive.
Chad