Choosing a prop part 2

Well, I finally got my tach working, My '80 SN has a Ford 351 Commander, a Velvet 17-001 1:1 and a dinged 13x12 Michigan propeller labeled "super pitch"

I get 22mph at 2500rpm, and 39 at 4800, I still had some throttle left but backed it up cause I didnt want to over rev the engine.

The prop turned pretty easily all the rpms,
I was thinking on getting an ACME 540 or 542.

Thing is, I mostly will use this boat for wakeboard, I think that I need some more rpms at 22mph, but I dont want to get more at WOT.
wich is the prop to achieve this?

sorry, but that thread doesnt answer my question, I need a prop that turns 2800-3200RPM at 22mph so that I get full of engine while pulling a rider with around 1000lbs torque and still does not over rev at WOT.

I undertand that the ACME 540 and 542 are the props for my boat, but If my non CNC prop wich is 13x12 turns 4800 at wot how can a 13x12 or 13x11.5 CNC prop not over rev the engine????

My tach was offline and I've just had it rebuilt by a profesional, I though that since it gets signal from the coil it didnt need further calibration. I will have it checked anyway.

http://www.correctcraftfan.com/articles/ACME_540_Prop.asp

if your going to dump 1000 lbs in your 80 then who the hell is going to drive it as it is only rated for around 900 lbs total. so have your life insurance paid up and no kids in the boat. Very stupid sh*t you are proposing.

Luchog wrote: any reviews on the acme 208?? besides acme's statement that their own 3 blade outperforms their 4 blades?

My boat uses different props (1.23 trans) but Ive seen first hand that the 3-blades are the better performers. Id stick with either the 540 or 542. I imagine that either would outperform your current prop pretty handily.

John, I have to drive the boat 10 minutes to get to the bar, it's usually smooth water but it can get pretty nasty sometimes, for my own surprise the 80 handles bad weather much better than expected. It's just a matter of putting the wind on your stern while crossing the main water channel.
I can place the narrow boat between the 2-3 feet waves and surf them at 22mph, we dont even get wet, just some spray over the back. You dont have to go against the waves but use them in your favour.

As for 79's comments, I appreciate his concern but there is no need to. I dont want to sound annoying but I put out more than 200hours a year on different boats, so I know what I can and what I can't do in a certain boat.

John, yes I do have to carry supplies there by boat, all of them but beer, there is a supplier that delivers beer packs on the islands.

I love this kind of acuatic life!!!

Luchog wrote: we had the 80 out today for a boarding session, we had 600lbs plus driver/passenger while pulling a skier, boat turns 2600rpm at 22. My guess is the ACME 540 will pull 2800-2900 at 22mph and the 542 2900-3200rpm. Can anyone give in some input in this?

I have the 540 on my 81 351. Timb is pretty close with his top end numbers and my experience with that prop is no way on the 2800-2900 at 22 mph. I don't have exact numbers for you but you will be closer to 2600 at 22mph with a 540. The 542 is a better wakeboard prop for you and MAY get you to 2800-2900. I don't run any weight other than peeps and gear so my rpms may be lower than what your shooting for but still the 542 is the right one. It will rev you over 5000 easy though.

JoeinNY wrote: Your being too conservative 2400-2500 would be plenty of rpms.

Does anyone have a torque curve? I'll guess that max torque is right around the 2500 and that's good!

I'm still deciding between the 542 and the 208, probably will hit the 542.

I think I'll be resizing and balancing my 13x12 into a 12 3/4 X 12. any guess on results?