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View Full Version : OJ Vs. Acme on X-30 2003 MCX 350 HP (For those that just want to know)


gtink
05-12-2007, 11:58 PM
Hi all,

My wife and I have been doing far more cruising than skiing lately. "Why are you doing that?" you’re thinking. :)

Well, our 9 month old daughter "Ashley" loves to ride, with the wind blowing her hair.

I'll get a picture of all of us on the lake soon... But here she is at 8 months of age.

21737

She's my cuttie... :)

Well, now back to the reason I am posting this Thread.

I have been doing research on different props to determine best performance for my boat... Performance is always a nightmare, as each person always looks for particular items that one may consider import, and others may not.

What do I consider important?
LOTS of power, but low engine ware.

Low engine ware? Yes, I am trying to increase the engine life in my boat by reducing the RPM's @ cruising speed. Gas is not a driving factor, as no one that owns one of these boats is extremely concerned of gas rate conception. We all know power = lots of gas. Of course, we all watch how much gas we go through, but again, that’s not rate of consumption but more related to amount consumed.

My father always said “Get your foot out of the carburetor son!!!” As my brothers and I always liked driving the old Pickup with its 454 Bigblock… Those days were sure fun!!!

So, back on point.
Boat:
MasterCraft 2003 model X-30 with MCX 350 HP
Max RPM according to manual should be 4800-5200 (I prefer the 5200 #)

Location:
Cumming Ga. Lake Lanier http://lanier.sam.usace.army.mil/
Altitude 1071 msl = 3513.7 fsl
Temperature, 77 F
Water Temp, 78F
Humidity, 85% (Typical Ga Summer after a thunder shower)
Testing date: 5/12/2007

Testing Equipment on the boat:
RPM and Speed Measured by Perfect Pass Wakeboard Pro ver 6.4

I put a new impeller in the boat for the perfect pass system last week and did not take the time to check it with my GPS... However, my top end speed has always remained the same with the OJ prop 42.2 MPH so it should be VERY VERY close if not dead on...


Sorry for the crappy CHART below... when I copy my excel or word chart (which look good I think) into this thread creation tool it will not allow me to format the table... I am sure there is a way, but its late and I do not want to take the time to find it tonight. :(

PROP Test Data:

Acme 1039 13.5 X 19.5


RPM Idle(650) 1000 1500 2000 2500 3000
MPH 3.6 5.4 7.1 9.8 21.6 29.1

RPM 3500 4000 4500 WOT 4620
MPH 34.3 40.1 42.4 42.6

OJ 14 X 18

RPM Idle(650) 1000 1500 2000 2500 3000 3500
MPH 3.3 5 6.7 8.4 13.9 25.4 30.2

RPM 4000 4500 5000 WOT (5200)MPH 34.5 38.7 41.6 42.2


I have spoke to Jim @ Acme Marine e-mail @ http://acmemarine.com/html/contact2.asp

And Acme has been very helpful in letting me try the ACME 1039 on my boat.

What have I learned?
I like POWER.

The prop did exactly what Jim told me it would do, it lowered my RPM's allowing for a far better cruising condition. "Quieter" less, engine noise.

However, I had to sacrifice a lot of my power with regards to hole shot etc.... More power sacrifice than I wanted.

So, I will be sending the ACME 1039 back and swapping it for the ACME 845. @ which point I will update this positing with the latest technical data for all of you to draw your own conclusions.

Ohh I forgot to mention, the ACME 1039 was quieter "no cavitations", far less right steer chatter @ high speed > 3500 RPMS and what I am guessing is vibration.

My OJ prop is the factory original, so I guess a rebalance is needed but I have never hit anything and the prop looks to be in GREAT shape.

Well, I will keep you posted on my findings.

prostar205
05-13-2007, 12:12 AM
gtink -

Please keep us informed on your findings. I have a 2002 X30 with the L-18. Talk about power, that engine is a monster. I am currently running the new OJ XMP 13.5" x 17.5". The hole shot with this prop/engine combination is amazing. Wide Open Throttle is around 5,200 RPM but I'm doing almost 50 mph at that RPM. I rarely open it up because the lake we are on is choppy all the time and the X30 does not do well in heavy chop.

EJ OJPROP
05-13-2007, 09:21 AM
Hi all,

My wife and I have been doing far more cruising than skiing lately. "Why are you doing that?" you’re thinking. :)

Well, our 9 month old daughter "Ashley" loves to ride, with the wind blowing her hair.

I'll get a picture of all of us on the lake soon... But here she is at 8 months of age.

21737

She's my cuttie... :)

Well, now back to the reason I am posting this Thread.

I have been doing research on different props to determine best performance for my boat... Performance is always a nightmare, as each person always looks for particular items that one may consider import, and others may not.

What do I consider important?
LOTS of power, but low engine ware.

Low engine ware? Yes, I am trying to increase the engine life in my boat by reducing the RPM's @ cruising speed. Gas is not a driving factor, as no one that owns one of these boats is extremely concerned of gas rate conception. We all know power = lots of gas. Of course, we all watch how much gas we go through, but again, that’s not rate of consumption but more related to amount consumed.

My father always said “Get your foot out of the carburetor son!!!” As my brothers and I always liked driving the old Pickup with its 454 Bigblock… Those days were sure fun!!!

So, back on point.
Boat:
MasterCraft 2003 model X-30 with MCX 350 HP
Max RPM according to manual should be 4800-5200 (I prefer the 5200 #)

Location:
Cumming Ga. Lake Lanier http://lanier.sam.usace.army.mil/
Altitude 1071 msl = 3513.7 fsl
Temperature, 77 F
Water Temp, 78F
Humidity, 85% (Typical Ga Summer after a thunder shower)
Testing date: 5/12/2007

Testing Equipment on the boat:
RPM and Speed Measured by Perfect Pass Wakeboard Pro ver 6.4

I put a new impeller in the boat for the perfect pass system last week and did not take the time to check it with my GPS... However, my top end speed has always remained the same with the OJ prop 42.2 MPH so it should be VERY VERY close if not dead on...


Sorry for the crappy CHART below... when I copy my excel or word chart (which look good I think) into this thread creation tool it will not allow me to format the table... I am sure there is a way, but its late and I do not want to take the time to find it tonight. :(

PROP Test Data:

Acme 1039 13.5 X 19.5


RPM Idle(650) 1000 1500 2000 2500 3000
MPH 3.6 5.4 7.1 9.8 21.6 29.1

RPM 3500 4000 4500 WOT 4620
MPH 34.3 40.1 42.4 42.6

OJ 14 X 18

RPM Idle(650) 1000 1500 2000 2500 3000 3500
MPH 3.3 5 6.7 8.4 13.9 25.4 30.2

RPM 4000 4500 5000 WOT (5200)MPH 34.5 38.7 41.6 42.2


I have spoke to Jim @ Acme Marine e-mail @ http://acmemarine.com/html/contact2.asp

And Acme has been very helpful in letting me try the ACME 1039 on my boat.

What have I learned?
I like POWER.

The prop did exactly what Jim told me it would do, it lowered my RPM's allowing for a far better cruising condition. "Quieter" less, engine noise.

However, I had to sacrifice a lot of my power with regards to hole shot etc.... More power sacrifice than I wanted.

So, I will be sending the ACME 1039 back and swapping it for the ACME 845. @ which point I will update this positing with the latest technical data for all of you to draw your own conclusions.

Ohh I forgot to mention, the ACME 1039 was quieter "no cavitations", far less right steer chatter @ high speed > 3500 RPMS and what I am guessing is vibration.

My OJ prop is the factory original, so I guess a rebalance is needed but I have never hit anything and the prop looks to be in GREAT shape.

Well, I will keep you posted on my findings.


The difference you see in RPM to MPH is due to the Acme prop being 1.5" of pitch higher. If you try our OJ 13.7 X 19.5 against the Acme 19.5 your numbers would be much closer. Comparisons are great as long as they are like props. I would be happy to send you an OJ for a true trial. Although I would not suggest a 19.5 on the MCX motor as it keeps the max RPM below the prefered number. Imight look at a 13.7 X 17.5 to reduce the RPM but keeping it within the range.
Eric
eric@ojprops.com 800-359-9730

gtink
05-13-2007, 09:51 AM
Eric, you are right... I will compare the ACME 845 to the 13.7 X 17.5 OJ. They should be about the same, do you agree?

Utahfoiler
05-13-2007, 01:52 PM
I have a ACME 845 that I have used 2 times for sell.

http://www.tmcowners.com/market/showproduct.php?product=1397&cat=13

I went with the ACME 1479 14.5x14.25. I have an 05 X-30 and wanted more hole shot. I tried both the 845 and the 1479 and I liked the 1479 better. I did not take any numbers down so I can't provide a direct comparison.

EJ OJPROP
05-14-2007, 08:32 AM
Eric, you are right... I will compare the ACME 845 to the 13.7 X 17.5 OJ. They should be about the same, do you agree?

The 845 is a 13.5 X 16. So it would not compare to the 13.7 X 17.5 OJ part #456.

gtink
05-30-2007, 04:31 PM
Hi guys,

I was able to test several different props thanks to both ACME and OJ prop company's for letting me try the product to see if I could reduce RPM's and hold enough power to still play.

My results

Acme 1039 13.5 X 19.5
RPM Idle (650) 1000 1500 2000 2500 3000 3500 4000 4500 WOT 4620
MPH 3.6 5.4 7.1 9.8 21.6 29.1 34.3 40.1 42.4 42.6

OJ 14 X 18
RPM Idle (650) 1000 1500 2000 2500 3000 3500 4000 4500 5000 WOT (5200)
MPH 3.3 5 6.7 8.4 13.9 25.4 30.2 34.5 38.7 41.6 42.2

OJ XMP 14.25 X 14.5
RPM Idle (650) 1000 1500 2000 2500 3000 3500 4000 4500 5000 WOT (5300)
MPH 3.4 5 6.9 9.4 15.1 24.5 28.9 32.5 37.2 41.3 42.1

ACME 14.5 X 14.25
RPM Idle (650) 1000 1500 2000 2500 3000 3500 4000 4500 5000 WOT (5400) Rev limiter engaged.
MPH 3.6 5.2 6.8 8.3 13.1 22.8 27.8 32.1 35.6 39.2 40.1

Thoughts:
The Acme 1479 (14.5 X 14.25) Performed best overall but only by 1 aspect, vibration.

When I compared the ACME 14.5 X 14.25 to the OJ 14.25 X 14.5, I LOVED the power on the hole shot and over all power performance of both props. The TWO issues I had were the following:

Over rev on ACME 14.5 X 14.25
OJ 14.25 X 14.5 had a small vibration at 1000 – 1100 RPM’s that caused a low pitch hum for the ears that you could feel through the floor of the boat. I found the vibration issue the bigger of the two, as I never run at WOT.

I believe most users would not notice the vibration; however I spend a lot of hours in my boat and pick up on different noises very quickly. My brother took a minute to notice it when he went for a ride to confirm the vibration. We both inspected both props for vibration/noises to make sure one was not hearing something that the other could not pick up on.

At the end of the day, I need to remember that I'm not sitting in my MC 205 with 310 HP on a LT1 corvette motor. That 2200 Lbs boat would SCREAM. But, its time to make room for more family members and slow down to wakeboard a while. (I guess I'll get another 205 in a few years to go slalom on.) Just have to be an older, much cheaper one as all my money is tied up in the X-30. LOL :)

I hope this info above helps someone out.

Best wishes to all

gtink
05-30-2007, 04:34 PM
Ohh yea, forgot to mention...

Stepping up to a bigger pitch to reduce my RPM's stole all my power... No fun trying to get out of the hole with family in boat and throttle at wide open position while your dad sits behind you saying, "I thought this thing had 350 HP"...

LOL lesson learned; I would rather through them back in the seat. :)

MYMC
05-30-2007, 05:36 PM
Interesting anecdotal testing...and I am glad you found a prop that fits your needs. However, for those of you prop shopping there are many variables that are not taken into account or mentioned here (temp, humidity, current, wind, amount of fuel on board for each test, blower running, bimini out or in to name a few...) so please be careful when judging one manufacture against another. Both Acme and OJ build good products and offer above and beyond customer service...so please look hard. Lastly, when judging props most people are looking for acceleration numbers like time over distance, time to speed or distance to speed so take a hard look at those numbers when shopping as they matter greatly in tow boats sports.

east tx skier
05-30-2007, 05:40 PM
Interesting anecdotal testing...and I am glad you found a prop that fits your needs. However, for those of you prop shopping there are many variables that are not taken into account or mentioned here (temp, humidity, current, wind, amount of fuel on board for each test, blower running, bimini out or in to name a few...) so please be careful when judging one manufacture against another. Both Acme and OJ build good products and offer above and beyond customer service...so please look hard. Lastly, when judging props most people are looking for acceleration numbers like time over distance, time to speed or distance to speed so take a hard look at those numbers when shopping as they matter greatly in tow boats sports.

Having done my own side by side and then having put pen to paper to present some sort of cognizable results, I can vouch for the fact that the variables are just about enough to drive you nuts. Then there are the factors that you just have to make a "feel call" on. I'm glad I had the chance to do it, but I wouldn't want to do it again. Best thing is to just give both (all) manufacturers a spin and see what works best for you, on your boat, on your lake, on that day of the week, etc., etc.

Doug G
05-30-2007, 10:28 PM
Interesting anecdotal testing...and I am glad you found a prop that fits your needs. However, for those of you prop shopping there are many variables that are not taken into account or mentioned here (temp, humidity, current, wind, amount of fuel on board for each test, blower running, bimini out or in to name a few...) so please be careful when judging one manufacture against another. Both Acme and OJ build good products and offer above and beyond customer service...so please look hard. Lastly, when judging props most people are looking for acceleration numbers like time over distance, time to speed or distance to speed so take a hard look at those numbers when shopping as they matter greatly in tow boats sports.

I get the rest but I don't get the blower on?

JohnE
05-30-2007, 11:53 PM
I just sold my old tristar 190. Before buying my new 197 I read a lot of posts on here and thought I wanted an ACME for it. I spoke with Bill at ACME about which one. I then called a dealer from this site and he offered an in stock OJ at a much lower price, with high recommendations on it. He also offered to get me the ACME if I truly wanted it. Well I sold the tristar to a friend and got on it for the first time this past weekend. I was like a new boat with the new OJ prop!

But I'm betting that with the recommended ACME it would be too. I really bet that 2 comparable props from ACME and OJ are more alike than different. If there were a huge difference in performance, one of the 2 companiew would not have stood the test of time, right?

I should be a politician, eh?

MYMC
05-31-2007, 11:18 AM
I get the rest but I don't get the blower on?
Lowers the engine compartment temp, which lowers inlet airtemp and the engine makes more power.

Doug G
05-31-2007, 03:47 PM
Lowers the engine compartment temp, which lowers inlet airtemp and the engine makes more power.

Thanks Mike. I would not have guessed that the blower fan could make that much of an impact to affect performance. I can go home now I have learned my one thing for the day. Quota met !

MYMC
05-31-2007, 04:14 PM
Thanks Mike. I would not have guessed that the blower fan could make that much of an impact to affect performance. I can go home now I have learned my one thing for the day. Quota met !
Anytime!
I need to learn something quick...it's 3:15 and 92 degrees so I need to be at the lake!;)

6ballsisall
05-31-2007, 04:44 PM
I had the Acme CNC on all 3 of my boats (86 PS190, 95 PS190, and 03 X7)
On both of the older boats the CNC prop REALLY woke the boat up, especially the 95 PS190. I noticed no performance differences on the X7 other than a better slalom wake (less rooster tail)

Doug G
05-31-2007, 04:53 PM
Here ya go Mike:




Consider yourself edgimacated and get on the dayum water :)

MYMC
05-31-2007, 05:08 PM
Here ya go Mike:




Consider yourself edgimacated and get on the dayum water :)

Thanks! Consider me outtahere!:)