STV RR/Euro + New 300R

[Talon 25]

Is it possible from a balance and performance point of view to run the new 300R 4 stroke on these types of rigs?

The 300XS was listed at 505lbs and the new 300R is listed at 512 plus fluids. Is that going to make a difference in a real world pleasure application?

Is anyone aware if Wally is going to give it a try?

[mach351]

I dont see why it wouldn’t work on a heavier lay up boat.

As to Wally, if you’re referring to Wally Lampkin, he sold the molds to the stv probably ten years ago and hasn’t really been involved in boats much since then.

[mjw930]

There shouldn’t be any significant weight and balance issues but you need to take into account the 1.75:1 gear ratio. I believe most properly setup STV’s are already running 34 pitch props to find top speed with the 1.62:1 gears. You may need to get into props that are both more expensive and less efficient.

[engineermike]

Mercury lists the operating range of the 300r to be 300 rpm higher than the 300xs (6400 vs 6100). I'm speculating a bit, but if the rev limiter is also 300 rpm higher, then that will help compensate for the shorter gear.

[Talon 25]

[QUOTE=Talon 25;3051689]Is it possible from a balance and performance point of view to run the new 300R 4 stroke on these types of rigs?

The 300XS was listed at 505lbs and the new 300R is listed at 512 plus fluids. Is that going to make a difference in a real world pleasure application?

Is anyone aware if Wally is going to give it a try?

Yeah that was a brain fart. I know Jack has the molds...

[mjw930]

Mercury lists the operating range of the 300r to be 300 rpm higher than the 300xs (6400 vs 6100). I'm speculating a bit, but if the rev limiter is also 300 rpm higher, then that will help compensate for the shorter gear.

True, it all depends on setup. However, think many of the guys posting 120+ numbers with the STV’s are running modified motors turning much higher rpms.

[JPEROG]

If I was building a new Euro and had the financial ability to go with a 300R, there is no question that it would be my choice. The top end isn't going be earth shattering until the rumor gears become available but how much faster do you want to go then 110? All of the upsides far outweigh the top end number in my eyes and running over 100 for long distance in a single engine is not a good plan. I think the torque of this new motor will make a four passenger STV (with four people in it) still be an everyday 100 mph lake boat. I hope to see someone put this combo together soon.

Joe

[mjw930]

If I was building a new Euro and had the financial ability to go with a 300R, there is no question that it would be my choice. The top end isn't going be earth shattering until the rumor gears become available but how much faster do you want to go then 110? All of the upsides far outweigh the top end number in my eyes and running over 100 for long distance in a single engine is not a good plan. I think the torque of this new motor will make a four passenger STV (with four people in it) still be an everyday 100 mph lake boat. I hope to see someone put this combo together soon.

Joe

You beat me to it, I was going to say exactly the same thing. With a decent prop you'll still get into the 100's but it would be a rocket ship in the 60 - 90 mph range which is where it will spend the bulk of it's time.

[Talon 25]

Has anyone ever seen one with the deck off? Are they fully cored? Full bulkheads? Can it take the engine weight and lake chop? I've never seen any construction pictures. I'm assuming you could beef up a used one if you were handy.

[mach351]

Jack is the guy who can answer every one of those questions. Lots of 3.0L boats running around so I’m sure it’s doable. If you’re looking a four seats though, cross a river rocket off and go with a euro. Four seat river rockets are miserable and uncomfortable.

[Talon 25]

I think I'm leaning toward a 2 seater RR. Its looks pretty cozy up front so im guessing in line seating is better, though side by side might be better balanced.

[nitro_rat]

Cozy up front can be a good thing, depending on the passenger...

[JPEROG]

I think I'm leaning toward a 2 seater RR. Its looks pretty cozy up front so im guessing in line seating is better, though side by side might be better balanced.

I converted my current RR from a center steer to a side by side due to the fact that I usually have my wife or my son in the boats with me. If you don't have that situation and want the ultimate handling then go with a center steer. Its 38 inches across the cockpit.




Joe

[JPEROG]

Has anyone ever seen one with the deck off? Are they fully cored? Full bulkheads? Can it take the engine weight and lake chop? I've never seen any construction pictures. I'm assuming you could beef up a used one if you were handy.

I added a lot of structural carbon and bulkheads to this one but the results are exactly what I wanted. You will need to tell Jack that you are putting a 300R on it and not be worried about the boat weighing 800lbs due to the extra material. Mine weighed 850 before rigging but still runs pretty respectable.

https://www.youtube.com/watch?v=HEnYTXLUABM

Joe