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Originally Posted by Griff
(Post 4483893)
From the pic, that drive/ X dim is in the basement. That will make it quick to plane, but slower at WOT.
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Originally Posted by ezstriper
(Post 4483942)
speed cost $$$$ how fast do you want to go...not a performance boat, so ?
Imho 60 isn't really performance boat speed and I agree it's not a performance boat... But that doesn't mean it can't be fun to drive :) |
Originally Posted by tommymonza
(Post 4483970)
Most 21 foot scarabs ran 60 with 260 horse and a 1.5-1 drive.
Your boat has a pad bottom like the scarab so 55-60 with a mild 383 should be cake unless the bottom has a big hook in it. But what do you mean by "big hook"? |
Originally Posted by Sydwayz
(Post 4483975)
What is the biggest power package that they installed OEM on this hull?
You cannot just throw more HP at any hull, and expect it to improve speed and act/handle accordingly, linearly. Sometimes you reach the limit of a hull's capability, and when you do; it let's you know in a hurry, and usually it's not pretty. I agree that you can't just throw hp at it without thought... That's why I'm here asking for your guys opinion on the hull design. I'm well aware of the difficulties operating a overpowered boat. I can live with moderate chine walk. I don't spend allot of time driving my boat at wot. With the opinions I've gotten so far and looking at performance boat hulls I think it should do 60 without to much trouble. I am going to add trim tabs... Hopefully they will help |
Ya know it's funny...
When I was first started thinking about re-powering I thought about trying to get another 50hp and 5mph out of the 4.3 (almost impossible I might add) Then it was 100 hp and 10 mph from a 5.7... Now I'm at adding 150 hp from a 383 stroker and hopefully 15 mph... This is addicting haaaha :D |
If you have a .43 with a 4 barrel @205 hp you can achieve 55 mph with a 23p( ballistic) prop and some fine tuning.
If your going to beef up the 383 you might want to invest into a Brovo outdrive . Your virtually going to double the HP. The alpha outdrive will not last long. |
I agree... But I'm shooting for another 150 crankshaft hp which should put me at 320-330 prop hp and not quite double the hp... Keep hearing that it will survive if treated nicely and serviced regularly..
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Every time I read this title I ask myself, "How much money do you have?" Lol.
I have no practical experience on the matter, but the folks getting good results with bigger power on a stock drive attribute it to lots and lots of cooling water over the drive. Spikes of jumping waves and hard holeshots are brutal, but a lot of failures happen in flat water with long runs. It's just a constant load with no relief. |
I agree... Drive shower and I'm thinking sei drive (re-gearing will almost cost more)
with my build I'm shooting for 350 crankshaft hp... That should put me just over 300 prop hp. Alpha one is rated at 300 max prop hp so although I'm adding allot of torque with the stroker and proly 20-30 hp... I'm feeling pretty confident that it'll survive lol My budget is 7 grand...and I don't have much money... Can I borrow some? :D |
If your worried about breaking an Alfalfa with a 350hp 383,build a 350hp 350.
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