Help needed: 94 Pantera 2 w/ 2019 175Yamaha

[Wheelman]

I don’t know anything about that prop, but it doesn’t seem to be a bad choice from what I read. Your rpms are low, but so is your speed as I’d think the boat should do 60 with that engine. What is your pad to prop height? Do you have a jackplate to be able to easily adjust it?

[simon38]

I will measure this weekend.  Just to be sure I do it correctly,  take a 4 ft level and place on very bottom of boat and measure to center of prop?  The boat does have a manual jackplate.

[Wheelman]

That works though I just level bottom of boat and measure to concrete floor, then level outboard and measure to floor. Subtract the difference of the two should be around 3.5” and just making sure you’re in the ballpark being a repower. The prop may be contributing, but depending on the engine height it may not be allowing prop to operate optimally. It doesn’t have PVS plugs to fine tune holeshot, what do your RPM’s jump to when you go WOT from idle?

[simon38]

I will measure this weekend.  won’t do any testing we just got 6 inches snow today.

Local prop shop  has a Mercury stiletto 14x 21 he is wanting to try but waiting on weather.  Prop is used,  any opinions?

 

[simon38]

pad to center of prop is 4 inches

 

[SLumpp]

In this forum as well as on the archive there are posts exactly on this topic, top speed and steering.  In a nutshell, watch your water pressure, rpms, and steering control as you adjust your manual plate upwards, approximately 1/8 of an inch, then go try the boat out and see how it reacts.  Different motors/hull/prop combinations, as well as how you load the boat, will dictate how much prop to hull difference you should have.  A good starting point is 3 1/2 inches, however, I would not raise that motor  up to that height right off the bat.  Many things are going to contribute to how high the motor is going to be, water pressure, rpms, boat control, and of course how comfortable you feel when you are driving it at wide open throttle.  Do I believe that a different prop might help, maybe, but before I condemn that prop and toss some money at another one I would get some gas in the boat, load it up exactly how heavy you believe it will be when you use it most of the time and go drive it, adjusting the prop height up and down until you get where you believe is the optimum for that motor/boat/prop combination.  If you don’t have another person with you when doing these adjustments, when you would have that weight with you at other times get some weight (IE if your partner is 100 lbs add that much weight into the middle of the boat by the seat).  Another good trick to do is to draw a line on the jack plate where the two parts meet as your starting point.  Take a picture of that mark prior to any adjustments, that way if you do not like what you feel when you drive the boat you will know where your starting point was.  Good luck

[simon38]

ok thanks,  waiting  for snow to melt

 

[Wheelman]

4” is on the lower end, but that means the prop should have plenty of bite. What’s your rooster tail like when running WOT? I don’t know anything about the Stiletto prop, but it doesn’t appear to have PVS plugs which are nice to fine tune the ventilation for optimum holeshot.

[simon38]

rooster tail is around 2-3 ft

[Bass Cat Boats]

Simon, we don’t know what propeller you will end up with, though we wouldn’t run a Stiletto. There are actually two different brands that made a prop named Stiletto, and neither is in production today. We believe yours is the four blade version with thru hub, the other is an over the hub.

On that Four stroke we would first try and stay to Yamaha propellers if you can. You can somewhat of an odd combination, first a new and old boat to engine, and now a 175 on a 200 rated boat with that age variation.

After trying Yamaha props, try a Mercury Trophy in the 23-22 range. They will require a hub assembly which fits your engine. You need to work with a propeller rebuilder or reconditioning shop, in order to find someone with a variation of components, and someone who will work with you based on exchanging and swapping.

If you can find the components from a friend or in someone’s garage, just give them a spin and see. Try to assemble this all on one day to test run them at a secluded ramp so you have time and it’s no inconvenient to you and other boaters. In and out changing propellers takes time and it can frustrate all parties when you’re setting up a rig.

BCB

 

 

[BuckeyeBasscat.basscatowners]

Before you mess with prop test- check your throttle plates for wide open operation.

[Author]

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