X-star with the 8.1 engine.... What prop?

(guido) · (guido) **Join Date: Jul 2002** 04-16-2007, 8:11 AM

Hey guys... We got the new X-star out over the weekend and can't help but think it's under propped. The 8.1 spins the stock prop like it's nothing. Riding speed is close to 4k rpm's. I'll try to get the details of what prop is on the boat this week, but I'm wondering in the meantime what other people have run with their 8.1's.

Thanks.

(mcwakerider) · (mcwakerider) **Join Date: Dec 2006** 04-16-2007, 8:49 AM

this is of no help to you, but that is a big motor... Im sure you'll be throwing out some fatties with that boat

(phat_in_cincy) · (phat_in_cincy) **Join Date: May 2003** 04-16-2007, 9:06 AM

Check out Travis' post in this thread...

http://www.wakeworld.com/MB/Discus/messages/3183/429084.html?1175171050

EDIT: Oops...his response is based upon the MCX.

(Message edited by P-hat in Cincy on April 16, 2007)

(phat_in_cincy) · (phat_in_cincy) **Join Date: May 2003** 04-16-2007, 9:37 AM

EDIT II: Call or email the prop mfg. direct. Eric @ OJ Props responded to a prop thread of mine. I called him and I got one I wanted.

http://ojprops.com/

(guido) · (guido) **Join Date: Jul 2002** 04-16-2007, 9:52 AM

Thanks guys... I've gotta look at the numbers ont he prop when I get out to the boat again. It's gotta be the same prop that's on the boats with the smaller motors. It's got a ton of power. I'm thinking it should be turning 3k or less rpm's at riding speed.

Billy, I think so. The wake is shaping up nicely already. Big, wide and hard. Kinda sounds like a porn description.

mendo247 04-16-2007, 9:58 AM

DUDE! where are the pics!

(lionel) · (lionel) **Join Date: Nov 2005** 04-16-2007, 10:23 AM

Evan, get a hold of Mike with Mastercraft of Charlotte, he knows all the stock props and he loves that engine. I bet he knows what prop is best for that boat. He also married to Megan Major, so he has that going for him.... (704) 525-6660......

(peter_c) · (peter_c) **Join Date: Sep 2001** 04-16-2007, 10:36 AM

Some boats come with the 16" prop, while it seems others use an 18". Some even have up too a 22".

http://www.newboats.com/product.jsp?ID=81488
http://www.motorboating.com/motorboat/seatrials/article/0,12696,1051533,00.html

(bond) · (bond) **Join Date: Nov 2002** 04-16-2007, 12:06 PM

Lets see the new ride Evan

(mcwakerider) · (mcwakerider) **Join Date: Dec 2006** 04-16-2007, 1:05 PM

hahaha... Does kind of sound like a porn description. How much weight are you guys going to run?

(guido) · (guido) **Join Date: Jul 2002** 04-16-2007, 1:25 PM

Hey guys... I'll get some pics when the weather is better. Friday night we were rushed to get the boat loaded and into the water for a couple quick pulls, then it rained on us Saturday. Now the boat goes over to Nor-Cal Master Craft for their grand opening, so we don't get to play with it for a week.

They're going to have all the running gear off the boat for the opening, so I'd like to find a prop to have them change to while it's apart.

The pics are coming, though. I promise. It's a really nice boat. I'm looking forward to stacking that thing with people this summer. I loved my X2, but am stoked on the extra room in the X-star.

Billy, we're just breaking it in, so we're sticking to around 3k right now. LOL!!!

(mcwakerider) · (mcwakerider) **Join Date: Dec 2006** 04-16-2007, 1:37 PM

hahaha... yea. dont wanna over load it.

They are going to have the rail jam at the shop this weekend too right?

(guido) · (guido) **Join Date: Jul 2002** 04-17-2007, 10:03 AM

yup, kicks off friday night. Rusty and Andrew are confirmed riders for the event. I'm headed over there tonight. I hear they've been building already. I'll have to see what they've got going on.

(mcwakerider) · (mcwakerider) **Join Date: Dec 2006** 04-17-2007, 10:46 AM

Rusty and andrew going to be riding all weekend?

(guido) · (guido) **Join Date: Jul 2002** 04-17-2007, 1:40 PM

That's my understanding

(keith2002) · (keith2002) **Join Date: Apr 2006** 04-17-2007, 1:59 PM

Evan - I saw you guys headed out of Orwood Friday when I was coming in. The new X-Star is sweet. Congrats on the new ride.

(mjmurphy53711) · (mjmurphy53711) **Join Date: Mar 2004** 04-17-2007, 2:04 PM

Congrats on the boat Evan, whenever you need a wake "tester" I am ready to drive down the hill.

(big_ed_x2) · (big_ed_x2) **Join Date: Jul 2004** 04-17-2007, 2:12 PM

Damn dude you bought an X-Star??

Big congrats on the new ride!!

pix?

(xaggie) · (xaggie) **Join Date: Nov 2002** 05-03-2007, 8:17 PM

Ok I want to keep this going since I've had this question since '04. I finally got off my ass called Acme, and spoke to a really nice guy who's name for some reason I don't have in my notes. The stock prop is a 14 1/2 X 22. This gentleman recommended an Acme 849-67M which is 14X20 with a "180 cup". He explained that with this prop even though being smaller would increase top end and be more efficient down low. I'm no expert but I fail to see how if I'm running up to the Rev Limiter with the stock prop, going down in size will be to my advantage on the big end. Let's come up with a solution here guys, I venture to say we're a pretty resourceful bunch.

(boarditup) · (boarditup) **Join Date: Jan 2004** 05-03-2007, 8:26 PM

The reason is the greater cup kicks in at higher speeds while the lower the main part of the blade is in full control. Keep in mind that the Acme has more square inches of surface area than the stock OJ. The two brands do not match up number to number. They are different in both design and performance.

I'll bet Bill at Acme is right and that the combo was tested to verify the performance.

(luchog) · (luchog) **Join Date: Jun 2002** 05-03-2007, 9:08 PM

Karl knows what he's talking about, I'll get a prop from him as soon as I can.

(xaggie) · (xaggie) **Join Date: Nov 2002** 05-03-2007, 9:22 PM

Alright Karl could you do a bit of research on the testing they have done, and give me a quote on the prop? Thanks

(boarditup) · (boarditup) **Join Date: Jan 2004** 05-04-2007, 12:35 PM

The prop is now on my website under MasterCraft props.

The 8.1L X-45 and X-Star at altitude or near sea level with extra ballast use the 849-67M. Replacment with extra hole shot from stock use the 849. You can go up to a 14 or 14.5X22 if you are happy with the stock prop performance and want to lower the rpms a bit for the fuel economy.