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Diesel
06-23-2008, 01:17 PM
So I am entertaining the idea of upgrading the factory prop. Specs show a 12.5x12 OJ 4 blade shipped from the factory and I assume is on the boat right now.

Goals - I have a rough vibration during the hole shot which eventually cleans up around 20 mph which I would like to eliminate. I would like a bit stronger hole shot and if possible a few mph for footin'.

Currently considering these 3 Blades:

Acme 843 13x12 0.08 Cup
OJ XMP 346 13X12 0.09 Cup
OJ XMP 348 13X12 0.11 Cup


I get the diameter and pitch effects but, can anyone tell me what effect the cup differences will have on performance?

Anyone have any first hand experience with any of the above props?

Thanks in advance!

BrianM
06-23-2008, 01:19 PM
Call Eric at OJ and talk to him. He is great to work with and will be glad to tell you more than you could possibly want to know about props..

EJ OJPROP
06-24-2008, 09:38 AM
So I am entertaining the idea of upgrading the factory prop. Specs show a 12.5x12 OJ 4 blade shipped from the factory and I assume is on the boat right now.

Goals - I have a rough vibration during the hole shot which eventually cleans up around 20 mph which I would like to eliminate. I would like a bit stronger hole shot and if possible a few mph for footin'.

Currently considering these 3 Blades:

Acme 843 13x12 0.08 Cup
OJ XMP 346 13X12 0.09 Cup
OJ XMP 348 13X12 0.11 Cup


I get the diameter and pitch effects but, can anyone tell me what effect the cup differences will have on performance?

Anyone have any first hand experience with any of the above props?

Thanks in advance!

Our 13 X 11 LC XMP 3-blade has replaced the 12.5 X 12 as standard on the 1:1 boats at MC. The 13 X 12's you are looking at would not provide the low end improvement you are looking for, the 13 X 11 would with no loss on the top end. The 13 X 12's should also put your max RPM below the suggested max RPM.

Cup.....Much has been made of cup in recent years. The more cup in a propeller the lower the RPM will be. Less cup allows the motor to spin up higher.

Give me a call anytime if you have other questions.

Eric @OJ Props 800-359-9730

Diesel
06-24-2008, 10:52 AM
Our 13 X 11 LC XMP 3-blade has replaced the 12.5 X 12 as standard on the 1:1 boats at MC. The 13 X 12's you are looking at would not provide the low end improvement you are looking for, the 13 X 11 would with no loss on the top end. The 13 X 12's should also put your max RPM below the suggested max RPM.

Cup.....Much has been made of cup in recent years. The more cup in a propeller the lower the RPM will be. Less cup allows the motor to spin up higher.

Give me a call anytime if you have other questions.

Eric @OJ Props 800-359-9730

Thanks for the reply Eric,

So #342 or #344? From your description above I am leaning towards the #342.

I will call you today if I get a chance......

ShamrockIV
06-24-2008, 10:55 AM
i need to look at my prop i may have to change!!!


i have a 209 with mcx and 4 blade!!!

EJ OJPROP
06-24-2008, 11:00 AM
342 would be the one. You are welcome to try one Sham, just come down and get one to run. We are in Loudon, TN.

Diesel
06-24-2008, 11:00 AM
i need to look at my prop i may have to change!!!


i have a 209 with mcx and 4 blade!!!

I will let you know the results of which ever prop I choose. ;)

Diesel
06-24-2008, 11:01 AM
342 would be the one. You are welcome to try one Sham, just come down and get one to run. We are in Loudon, TN.

Thanks,

I am calling the dealer now......:)

ShamrockIV
06-24-2008, 11:01 AM
I will let you know the results of which ever prop I choose. ;)

thanks just pm me!! i need to look and see which one i have now!!

i am not sure about the slot though!!! how can i check?? i assume it is written somewhere?

Diesel
06-24-2008, 11:14 AM
thanks just pm me!! i need to look and see which one i have now!!

i am not sure about the slot though!!! how can i check?? i assume it is written somewhere?

You will know by the size of the prop which is on it now or you can check the ratio tab on the top of the transmission.

Chicago190
06-24-2008, 11:37 AM
thanks just pm me!! i need to look and see which one i have now!!

i am not sure about the slot though!!! how can i check?? i assume it is written somewhere?

There should be a tag/ID plate on top of the transmission with the ratio stamped on it. Just lift the motor box and stick your head in the back by the trans fluid dipstick.

Diesel
06-24-2008, 12:38 PM
342 would be the one. You are welcome to try one Sham, just come down and get one to run. We are in Loudon, TN.

Just ordered the #342.......thanks Eric.

I will post up the results. Nothing fancy or complex like previous comparisons......just a "hell yeah this thing rocks, buy one now" or an "eh save your money or try an acme". :D

peason
06-24-2008, 02:04 PM
I too am very interested in a new prop for my 209 with the 310 predator engine. I currently have 2 of the 4 blade stock props.

Diesel
07-28-2008, 01:04 PM
Sorry for the delayed response. I have had the OJ 13x11 three blade #342 on for two weeks and could not be happier. The vibration at acceleration is gone, the hole shot is excellent and I did not loose any top end....still around 42-43. Also it pulls very strong in the mid range once the RPMs are up near 3k. Max RPMs at WOT is ~ 4900 to 5000 and it does not appear I can hit the rev limiter regardless of what I try. Overall impression - worth the money and a very nice improvement.

Thanks for all the help Eric and I would also like to give Carl at Boarditup.com some "props" for excellent service, great prices, and fast delivery. ;)

peason
07-28-2008, 01:22 PM
Deisel, how has this prop improved your footing wake? I get a lot of turbulence in the middle of the wake and therefore I don't use my 209 to do wake crosses and if I do do a deep start I usually get out of the wake and into the curl to stand up.

As a family, we use the boat mainly to pull to wakeboard, but my wife and I do like to slalom freeski - we are not course skiers and of course I like to get in some barefoot runs.

Thanks for any input.

ProTour X9
07-28-2008, 01:24 PM
I just talked to my cousin at our family reunion who works in the engineering dept of Acme Props he suggested (for hole shot obviously) a lower pitch with more cup (I think he said 105 to 150; something like that). We'll be trying an Acme soon, our boat goes 46 via gps with our current OJ 13X12 speed is great but holeshot is more important.


PS It was interesting hearing about all the prop "politics" of which I won't disclose:D

TMCNo1
07-28-2008, 01:57 PM
:popcorn::eek3::popcorn:

JLeuck64
07-28-2008, 02:01 PM
Don't overlook the vibration you have!

That needs your attention!

Oops, sorry bout the late post!

Diesel
07-28-2008, 02:53 PM
Deisel, how has this prop improved your footing wake? I get a lot of turbulence in the middle of the wake and therefore I don't use my 209 to do wake crosses and if I do do a deep start I usually get out of the wake and into the curl to stand up.

As a family, we use the boat mainly to pull to wakeboard, but my wife and I do like to slalom freeski - we are not course skiers and of course I like to get in some barefoot runs.

Thanks for any input.

Funny you ask....I made quite a few long line passes and I could not tell a difference in the table......it's still turbulent as all get out. I cheek out as well and just attack the wake low and wide in crossings. However, I can stand up much faster and the top speed feels about the same which is slower than I like but I have adjusted to the 209's footin' quirks.

Diesel
07-28-2008, 02:56 PM
Don't overlook the vibration you have!

That needs your attention!

Oops, sorry bout the late post!

Actually the vibration on the factory OJ 4 Blade was discovered to be a bent blade. I noticed it once it was off the boat.........damn wife.

peason
07-30-2008, 12:06 AM
Actually the vibration on the factory OJ 4 Blade was discovered to be a bent blade. I noticed it once it was off the boat.........damn wife.

Way to throw her under the bus!