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| Does anyone know what pitch for the prop on this rig. Thanks. |
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Posts: 32935
Location: Rhinelander, Wisconsin | 23 to 25 pitch tempest plus. Small hole vents. |
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| I used to use a Tempest on my 620 boat but switched to a Rev4 a few years ago. The Rev4 is a much better prop than the Tempest. |
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Posts: 84
| I am not so sure that you can turn a 25 with that motor. You might struggle a bit with hole shot. I am pretty sure a 21 or a 23 at best. I would check directly with Mercury. My 2006 620 came with a 23 on a 250 xs.
Rick |
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Posts: 32935
Location: Rhinelander, Wisconsin | Te new 250 XS can turn a 25 under certain conditions if the motor is set at optimum height and the load is right, and a 23 under others. A 21 might be a little too much unless the rig is running very heavy.
The Rev 4 is a great prop, but probably will be borderline in a 23. Bigger wheel, takes more to spin it; lots of lift for the rear of the boat, too. You will sacrifice so e speed with the Rev 4 over a properly matched tempest, but handling in some conditions may be improved. |
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Posts: 110
Location: NEW LENOX IL | What rpm are they getting with a 25 tempest .What is the right load ? What are the conditions? What is optimum height? (raised up all the way on the transom or running a jackplate)
Dont forget overpropping an outboard will slowly kill it
Dont buy a prop until you get to try a few diffrent ones
"21-23 rev4 or tempest"
my fav wheel is a mod 19 rev 4 for my 620(07) 250 verado ,Gives me good holeshot, neck snapping midrange and around 60 with two people in the boat but most important it lets my motor spin close to its max rpm when loaded light.
also dont forget to run Mrerc quickleen in the fuel
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Posts: 32935
Location: Rhinelander, Wisconsin | What rpm are they getting with a 25 tempest---Depends on the load and what the height of the motor is. Optimally, the RPM's reached will be in the lower end of the acceptable RPM range with this wheel. The higher the motor mount, the higher RPM's will be available...to a point. Once that point is passed, the prop loses bite and performance is degraded.
What is the right load ?---light to medium load, distributed forward more than rear.
What are the conditions? ---Medium chop so the boat can easily get some air under it.
What is optimum height?(raised up all the way on the transom or running a jackplate)---I don't remember the measurement from the running bottom to the cavitation plate, but the motor was about two holes up if I remember correctly.
Dont forget overpropping an outboard will slowly kill it --If the blade runs in the acceptable RPM range, it will be fine. If not, then down a pitch...
Try the 21 pitch if the 23 is too much blade. if the 23 is perfect, there it is. Try the 25 if the 23 is right at the line for max RPM on your particular hull.
I'll take a look at the May Anglers Insight Marketing tournament and this weekend's upcoming MWC on Oahe, I'll be shooting about 20 Rangers or more at those two and quite a few will have Merc 250 XS power. I'll also ask Jay at the tech trailer, he'll know the perfect prop for each condition.
As I said, the Rev 4 takes more to spin it, and will require a drop in pitch or even two or more from a three blade, especially the Tempest Plus. |
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Posts: 84
| Ineresting. I couldn't turn a 25 tempest with the 250 Mercury XS racing motor on my 2006 620. It took forever to get out of the hole. It would be interesting to see a 250 pro xs turn one. Curious, Is anybody actually running a 25 pitch tempest on a 250 pro xs out there on the new 620 hull? |
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Posts: 32935
Location: Rhinelander, Wisconsin | Like I said, I'll check at the next couple tournaments and see what set up allows for a 25 with light to medium front load and see if any of the Pros are running that set up in competition....not sure about the engine height. |
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Posts: 110
Location: NEW LENOX IL | Eric olson Ran a 27 raker on his 620 250 etec ho with a 8" Jack plate and it ran over 70, 72 I think so what!!! No holeshot no midrange , it took quite a while for it to get up to speed and he had to Jack the hell out of the motor . He did it for kicks just to see what he could get out of her knowing that he was way over proped for every day use.
My boat will turn a 23 tempest that has been worked and gets me to the low end of the recomended rpm range and that's with a light load , just me on board. The only time I run it is if I'm fishing a tourney by my self . It gets me a couple more mph and holeshot is ok. Add another guy and holeshot is fair and that's with all vent plugs out.
Bottom line is get the motor near the high side of it's rpm operating range with a light load and your good to go
Think of it like this ,running a prop with too much pitch is like driving your car around in 4 th gear all the time
With the weight of a kicker, full livewell a partner or two and tackle a 23 tempest is
more than likely too much prop.
On all the boats I've helped to dial in all of them were over proped from the factory |
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Posts: 32935
Location: Rhinelander, Wisconsin | I shot video and stills of that rig quite often. It was very fast, that's for sure. If that's the goal, then that's the goal. Some guys red line the motor with a HI 5 to acquire optimum rough water handling, too. Since the original question didn't set parameters, I believe the answer needs to address the range of props that will run on differing set ups.
We ran a 250 Verado for a season a couple years ago, and were able to turn a 25, but optimum was a 23,we setteled on a Tempest Plus after trying several configurations. Top end with two people and full load was just at 65 on our rig. The 250 Verado is a very nice motor, but I really like the XS. |
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Posts: 110
Location: NEW LENOX IL | Steve I don't want to beat this to death but when you say you could turn a 25 tempest with a 250 V was this on a 620 and what was your rpm with a light load?Lugging a Verado will cause all kinds of problems . If you are not winding them up over 6 grand every now n then ,they can start to "make oil" .
Lugging a pro xs will cause excessive carbon /soot to form and can lead to all kinds of problems like fouled plugs , stuck rings/ ring jacking , leading to power head failure.
I feel my boats dialed in pretty well and the only time it gets to 65 is when it's behind my truck
Edited by THROWINWOOD 5/5/2010 11:57 PM
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Posts: 32935
Location: Rhinelander, Wisconsin | No, it wasn't on a Ranger; I was just pointing out the Verado is a very nice machine. No worries, I know what lugging an engine does if you are below the recommended RPM range, I sell Mercury and Suzuki engines. |
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| Put a 21 tempest plus on it with large vent holes. If you want a Rev 4 I think a 19 would work fine. A 25 on a 620 will not work. That motor will turn up to 6300 rpm so you got lots of room for a 21. Good luck. You can also call Ranger and they will give you the recommended prop based on testing. |
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Posts: 32935
Location: Rhinelander, Wisconsin | Merc 250 Pro XS Specs:
Specifications
HP @ Prop 250
kW @ Prop 184
Max RPM (WOT) 5500-6000
Cylinder/Configuration V-6 (60 degree vee)
Displacement (CID/cc) 185.9/3032
Bore & Stroke (in) 3.63 x 3.00
Bore & Stroke (mm) 92 x 76
Cooling System Water cooled with thermostat & pressure controlled
A 23 tempest turns 5800 RPM on the 2008 Ranger 620 according to test data; load it up and you should still be in the proper operating range.
http://www.mercurymarine.com/look_deeper/third_party.php?ID=86&Sort...
Another on a 2007, turning just near 5500 with a full fuel tank third hole up in 90 degree temps at 900'elevation fresh water, light winds:
http://www.mercurymarine.com/look_deeper/boat_house_bulletin.php?ID...
I checked around, those running the 25 last year were running a hydraulic lift plate and a water pressure gauge.
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| need help. I have a 2003 triton 205 with a mercury 250 xs motor. I have very bad hole shot. i bought the boat & it has a 26 pitch tempest prop.My max rpm right now is 5200 rpm. Whats my max rpm on this motor. I beleive it should bee 5400,to 5600? I need advice on which prop & pitch would be best for that motor & boat.top speed right now with 2 people is 56,57 gps. |
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Posts: 32935
Location: Rhinelander, Wisconsin | I'd try a 23 first. |
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| only bad thing a have to buy one because we dont have but one dealer.would you recomend the tempest 23 or the rev 4,23 pitch. i have 4 people in the boat at times. |
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Posts: 32935
Location: Rhinelander, Wisconsin | The Rev 4 usually requires a drop in pitch by one from a Tempest Plus because it's a much bigger wheel, it's hard to say without trying the prop. I'd say a 23 Rev 4 would be about right, but would strongly recommend finding one to try first as the perfect prop may be a 21 depending on what you are looking for in performance. |
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Posts: 183
| Take a moment and check out this website http://www.mercuryracing.com/blog/walleye-prop/ Scott will answer any questions you have. I went with this prop on my 1890 Tuffy with excellent results |
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