prop suggestion for 94 Monterey 19.2 Sur and question about trim

[danfinn]

Firstly, I was wondering what you guys would suggest that I should be running for a prop. I recently bought this and finally got it into the mechanic to fix a carb issue and get a full tuneup. I took it out last night and it's running perfect now.

The boat is a 1994 Montery 19.2 Sur. It's a 19 foot cuddy cabin. It's got a 4.3L Mercruiser with 4bbl carbs, I believe it's the LX engine. Correct me if I'm wrong but I think this is rated somewhere around 210 HP. It's got a 27 gallon fuel tank and on average has 3 people on board without too much additional weight. I live in Salt Lake City, UT. The lakes I boat in range from about 4600 feet above sea level to 7000 with occasional trips to Lake Powell which is somewhere around 3500 feet. Lately the boat has been seeing most of it's use wakeboarding and I don't see that changing any time soon.

I took it out last night and was seeing 5000 RPMs at WOT at an elevation of about 7000 feet, the spedo was reading 43 MPH.

I'm currently running a 19" pitch prop. What should I be using?


Secondly, I've got a question about the outdrive trim level (not trim tabs, don't have those). Up until last night I had always been running the boat with the trim all the way down. I noticed last night that when I ran the outdrive around the 1/2 way mark on the trim gauge that I got around an extra 1000 RPMs and 10 MPH. Should I typically be running the trim at the middle setting of the gauge?

Thanks,
Dan

 

[rndn]

Re: prop suggestion for 94 Monterey 19.2 Sur and question about trim

Secondly, I've got a question about the outdrive trim level (not trim tabs, don't have those). Up until last night I had always been running the boat with the trim all the way down. I noticed last night that when I ran the outdrive around the 1/2 way mark on the trim gauge that I got around an extra 1000 RPMs and 10 MPH. Should I typically be running the trim at the middle setting of the gauge?

Yes, you should always trim up after the initial launch to get the bow up out of the water. Once you get better you'll do this as the boat is climbing out of the water.

 

[danfinn]

Re: prop suggestion for 94 Monterey 19.2 Sur and question about trim

Yes, you should always trim up after the initial launch to get the bow up out of the water. Once you get better you'll do this as the boat is climbing out of the water.

so the initial launch should be done with the trim all the way down?

 

[rndn]

Re: prop suggestion for 94 Monterey 19.2 Sur and question about trim

It will get you out of the water faster.

 

[hwsiii]

Re: prop suggestion for 94 Monterey 19.2 Sur and question about trim

Dan, I would get a 21" pitch prop because you are able to turn 5,000 RPM at 7,000' and when your go loower you will be turning more RPM. The 21" in the same make and model of prop will bring your RPM down to about 4,500 RPM whih is where you should be running that motor and it will give you a touh more speed.


H

 

[danfinn]

Re: prop suggestion for 94 Monterey 19.2 Sur and question about trim

Dan, I would get a 21" pitch prop because you are able to turn 5,000 RPM at 7,000' and when your go loower you will be turning more RPM. The 21" in the same make and model of prop will bring your RPM down to about 4,500 RPM whih is where you should be running that motor and it will give you a touh more speed.


H

excellent, it just so happens that the boat also came with a 21" pitch prop but it's aluminum, where as the current 19" is SS. I'll be able to try it out this week, I'm down at lake Powell all week.

What's the correct diameter prop for my boat? What's the advantage of going to a 4 blade prop?