Jump to content

Welcome to TheMalibuCrew!

As a guest, you are welcome to poke around and view the majority of the content that we have to offer, but in order to post, search, contact members, and get full use out of the website you will need to Register for an Account. It's free and it's easy, so don't hesitate to join the TheMalibuCrew Family today!

Prop selection help please (JB-Foot?)


Recommended Posts

I had a thread with bad data a few days ago so I'm starting anew.

I have a 1996 Echelon LX Mercruiser 350L MPI 290 HP

I have Stargazer so that's my GPS speed. 637' elevation, on a lake.

Mr. Minus OEM 13x13 Forged:

3000rpm = 30mph

3500rpm = 35mph

4000rpm= 39mph

wot @4750 = 43mph

ACME 515 13x12:

3000rpm = 30mph

3500rpm = 35mph

4000rpm = 39.3mph

[email protected] = 43mph (44mph for a second,,said my friends gps phone)

As you can see I'm 1:1 up to about 4000 rpm and almost 40mph. Then it drops off big time but both props are the same performance.

The ACME has better idle thrust across the rudder for maneuvering and a noticeably better whole shot. But all other issues shows it to be the same as my stock prop. The both feel equally smooth in vibration.

Most of my desires in performance are for slalom course but we will be starting to barefoot this summer with my boat. The stock prop is fine in this comparison, but I'm not understanding the low WOT rpm and mph data. They are also so close in performance and I was expecting a better turn out with the ACME.

So here's my question to the guru's. I can buy a brand new OJ XMP 13x12 for 200.00. I've read that the OJ will actually turn less rpm than the ACME with the lower HP boats thus sacrificing even less mph top end? Is this prop going to have to much "bite" for my boat or will I enjoy the same or better top end with similar whole shot of the ACME?

I'm starting to think that I might as well stick with the OEM prop since the only diff I saw was the whole shot.

thanks for any help!!


Edited by Woodshed
Link to comment

Wish I could help. I want a new prop too, for more top end speed. I only get 40 mph/4300 rpm with my speed prop. and 38 mph with my power prop. They are prob as old as my boat (1990).

Link to comment

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...