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Thread: STV RR/Euro + New 300R
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06-16-2018, 06:46 AM #1Member
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STV RR/Euro + New 300R
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?
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06-16-2018, 07:42 AM #2
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.
'95 STV "The Blue Goose"
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06-16-2018, 08:04 AM #3
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.
Mark
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06-16-2018, 08:35 AM #46000 RPM
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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.
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06-16-2018, 09:17 AM #5Member
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[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...
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06-16-2018, 10:25 AM #6
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06-16-2018, 10:45 AM #7Supporting Member
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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.
JoeLast edited by JPEROG; 06-16-2018 at 10:51 AM.
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06-16-2018, 11:10 AM #8
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06-16-2018, 12:09 PM #9Member
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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.
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06-16-2018, 12:33 PM #10
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.
'95 STV "The Blue Goose"
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06-16-2018, 01:43 PM #11Member
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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.
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06-16-2018, 01:50 PM #12
Cozy up front can be a good thing, depending on the passenger...
Josh Peterson
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06-16-2018, 02:33 PM #13Supporting Member
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06-16-2018, 09:53 PM #14Supporting Member
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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
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