Nitrous

[Leedo Lanes]

Anyone install a nitrous setup in a Checkmate? Either I/O or O/B?? I was wondering how good they work or if it is a taboo to do it in a boat...

[Leedo Lanes]

Anyone install a nitrous setup in a Checkmate? Either I/O or O/B?? I was wondering how good they work or if it is a taboo to do it in a boat...

[175checkmate]

I have seen it done on an O/B. A bit more complicated to do on a 2 stroke but the same rules apply. On an I/O would be easer. Same as putting it on a car motor.
Still have to have the set up right or it goes boom. More fuel, (dedicated fuel system) Fuel safety solinoid. This will allow NOS to flow only if there is fuel. Timing needs to be backed off a bit. Most engines that blow using NOS where not set up right or the owner felt the rush of the extra 50hp and figures that the larger 200hp jets would be good and did not adjust for the set up.

[vinny p.]

I agree with what 175Checkmate has said. I would also add my .02 on this.
The 3 biggest problems I can see with Nitrous on a boat are, properly setting it up to not explode the pistons ( I guess that is the same for any Nitrous application, even cars ). Next, will the drive live. Finally, due to the fact that you want to put this on a boat, the big problem I see is what prop do you run??? If you prop for your horsepower without nitrous, when you hit the button, you will be under propped. Conversely, if you prop for the horsepower with nitrous, you will be over propped any time you are not leaning on the button. http://checkmate-boats.com/6/ws/,s,8626072361/Graemlins/brickwall.gif

[F150GT]

We put nitros on my brothers 25' Cobra, It was on a strong engine and the boat ran fast withought the nitros. I wasnt that impressed with NOS on a boat (at least on an offshore) On a boat you need HP all the time not just a short burst to win a drag race. It would probably be cool on an outboard because most races aren't long runs. I would only use it if the aplication was exactly what you wanted.
F150GT

[Leedo Lanes]

Great points...Yeah, I am starting to see the bigger picture with boat setups. I am too used to cars!! So true though, the nitrous isn't what you want.

[Enforcer 24]

I agree with F150GT. You need power ALL the time. I also agree with vinny p. You will bash your head to find the right prop/gearing ratio. I think the best bet is a blower for an I/O. Power is always there, you can get correct props for your application, and works with either EFI or carbs. Of course it costs more money but, in the long run, it is a more reliable set-up. Changing pully diameters for more or less boost is just as easy as changing a pill. (almost) Plus, the old roots style blowers sound AWESOME!! NOS vs. Blower.....it all depends on how you are going to use the boat really.

[Leedo Lanes]

Do they make blowers for the 4.3?? I want more power and don't think I can afford a crate motor right now which seems to be the best engine choice when I am ready to upgrade...

[Enforcer 24]

I know Paxton makes a blower for 4.3 Chevys in the S-Trucks so you might be able to fit one on a boat. Not to sure though.

[vinny p.]

Don't even think of attempting to put a supercharger on a 4.3 It WILL be money not well spent. For what it would cost you, you can build a solid normally aspirated 350 or 383 stroker, that would generate the same power. Plus, it will last alot longer. Upgrades to a V-6 are just not worth it.

[Stretch]

I agree w/vinny the small block is a good place to start. That 4.3 will probably blow and you will be left w/a hard to sell blower kit and a hull