Noyzee

iTrader: (37)

Im wondering how it works?
im guessing i would have to over prop the boat so it would lower rpm on motor so when i spray it i would be at my proper rpm. question is, how much would i have to loose on motor?
if i hit my boat with 100 shot and say it picked up 5-7 mph and all i had to do was prop it to loose say 1-2 mph i might be ok with that. that would put me at the 70 mph mark

O6DODGE

iTrader: (6)

That **** would be interesting to see to say the least.

Noyzee

iTrader: (37)

id line like 4 bottles up allong the rear of the boat. people would see it and not even want to race me, id probably never use it. lol

MMMZ/28

iTrader: (1)

I work at a marina and yea your on the right track, over prop it 2 pitch so if you running 25's run a 27 pitch or more, Make sure you use stainless steel. Also you will need alot of spray because well boats arnt cars haha. I recommend Presion propeller(SP?) in Indiana for anything custom you want, they could prob get you 3MPH without spray by just tweaking the prop.

Todd157k

iTrader: (5)

a buddy of mine did on his blown pickle fork hydro. It really didn't help much. Spun the prop so fast it cavitated. The plan at the time was to make it come on in stages. I think it got a bit too complicated for him (10 years ago) and he tossed it.
I did get to ski behind his boat... once. That's the reason I now drag my knuckles.

Noyzee

iTrader: (37)

MMMZ, i run a stainless 4 blade now. the 3 blade would pick up about 2 mph, but i like the ride and handle of the boat much better with the 4. this winter im going to be getting a lab finish prop from merc (ive seen poor stuff come out of some shops, so i will stick with merc) im hoping that will pick me up 1-2 mph, im putting new exhaust on it today/tomorrow, so im hoping that will gain me 1 mph. so with those tweeks and a few other little things i did im hoping to be around 63

98CamZ28

iTrader: (31)

Heh, I keep wanting to spray the family boat, we have a Checkmate Countach?, think it's a 21ftr with a 350 with 2 people in it we've had it up to 68mph, might be for sale soon too

Noyzee

iTrader: (37)

you have a checkmate and a white camaro. your the man.

My boat. 26 Checkmate











my white z











you have good taste. lol

RyanA

iTrader: (6)

Cavitation is what you'll have to worry about. If you can keep it from cavitating AND keep the prop in the water, you'll be OK. Keep in mind, it's a boat so water is your traction. Nitrous boats tend to want to jump out of the water; if you come out of the water, you will instantly over rev. I'd definitely have a window switch on it. Maybe the lake you are on is smoother than ours and you can easily stay in the water so that may not be an issue for you.

Z284U2TRY

iTrader: (5)

What is your max rpm with your current setup? from what I hear marine engines have forged internals. Any truth to this?

Noyzee

iTrader: (37)

most of my boating is done on the ocean, i spend more time in the air then in the water but on when its nice out there is a group of us that go out about the same time after work when the water is smooth and no one around, and hammer down.

as for traction, i run a 4 blade for that reason. i love the traction it gives the boat, and the way the boat handles is way better, so im ok with the loss of 2 mph.


as for max rpm, the boat starts beeping at me at 5k on the tach, but has a rev limiter of 5250. i find in most conditions the boat runs fastest right on the 5k mark

Robert56

iTrader: (2)

You don't wanna be spraying and be jumping waves, lol, as I know you know. i build boats for living and am so burned out I'll never own another, though have totaled a few, lol, with out spray.
Robert

Bad Habit Bird

iTrader: (12)

I watched Miami Vice last weekend and between that movie and this thread I've been thinking about picking up some sort of speed boat. Any of you guys know of a good forum to start reading up on them?

Noyzee

iTrader: (37)

what boats do you build?

Noyzee

iTrader: (37)

www.offshoreonly.com

its a great site.
how much cash you want to spend, and what kind of boating do you want to do? i have been boating for 28 years, im sure i can help a little bit

Bad Habit Bird

iTrader: (12)

I guy I used to work for had a pickle fork Jet boat (21' Liberator I think)with a 540" engine that ran pretty good. It was years ago but I want to say the boat ran in the mid 80mph range, I always like riding in it but from what I remember the jet boats are more limited when it comes to top end mph than prop boats.

I wouldn't mind finding something like that to play with. I will check out the forum you posted about and start doing some reading. Thanks for the link.

Noyzee

iTrader: (37)

yea, depending where you want to use it, i like an outboard for a pancake style boat, but the roost from a jet drive is unbeatable!!!
good luck

Robert56

iTrader: (2)

here's the Victor E, Vic edelbrock Jr's. i was the senior mech in the engine room. everything is one off hand built. 115' mega yacht and dual 16cyl power plants. took about 3 years to build.

Robert

Z284U2TRY

iTrader: (5)

You would have to over prop so much the boat would be a dog off the bottle. say you are running a 21 pitch very close to max rpm now well on the bottle you will be well into the limiter. If you repitched to 24 to stay off the limiter the boat would be a dog getting on plane and probably run 600-800 rpm less wot off the bottle.

Noyzee

iTrader: (37)

Robert, thats nice!!!!! more pics?


Z28, i was out last night and trimmed up, the 4 blade on the boat now was bumping the limiter. the boat kept going faster and faster as i trimmed it, but rpm kept going up and up. then boom, limmiter kicked in. if i could bump the limiter 200 rpm i bet i would pick up 1-2 mph. the boat picked up 2 mph from 4700-4900 them kept climbing till it hit the limiter