Anybody hear of Marine Nitrous Oxide for Outboards?

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Hey everybody, I was watching Monster Garage last night and Jesse & the boys were making a Shark Boat. One of the toys was a new 225 hp Honda 4 stroke. One of the marine specialists added a NOS system to it. I realize this is a 4 stroke, fuel injected engine, but here is my question for the all the boating/engine experience out there: Is there such a NOS set up for 2 stroke outboards out there somewhere, or is it impossible because of the oil/fuel mix and the lubricating characteristics of a 2 stroke. I am going to be rebuilding a 1979 200 Mercury Black Max for my ski boat this winter since the number 2 piston decided to "kiss" the cylinder head, but continues to run, just not well.... I'd be interested in exploring a NOS kit if such a beast exists for 2 stroke big HP engines... <br /><br />Thanks,<br /><br />FOOTER

 

[ZmOz]

Re: Anybody hear of Marine Nitrous Oxide for Outboards?

Yes, it can be done on a 2 stroke. I don't think they make any kits for it though, and it would be very expensive. Also I wouldn't do it unless your engine is already in perfect working order.

 

[vidar]

Re: Anybody hear of Marine Nitrous Oxide for Outboards?

it has no practical use exept for a holeshot....you will overrew your engine instantly.remember you dont have a higher gear to switch to when on gas.....so if prop gives you correct rpm at wot: flip switch-rpm+++++++++++ boom......and the hot oily pises are yours......

 

[braindead0]

Re: Anybody hear of Marine Nitrous Oxide for Outboards?

Wonder if Wiseco makes aftermarket forged pistons for ya? bump up the compression a bit perhaps...

 

[Dhadley]

Re: Anybody hear of Marine Nitrous Oxide for Outboards?

Yes to both questions.<br /><br />Yes there are nitros kits made for outboards but have kinda faded in popularity lately.<br /><br />Yes Wiseco will make higher compression pistons for your outboard. <br /><br />You sure you wanna do all that to a 2.4 that didnt stay together in stock form?

 

[footer]

Re: Anybody hear of Marine Nitrous Oxide for Outboards?

Thanks guys, yeah ZmOz - I wouldn't be exploring NOS with a damaged engine, it would be after a full rebuild and after break in period, which is my winter project. How do you know that this can be done with an oil/fuel mix application and not have any lubricating issues in a 2 stroke? Would the nitrous as a fuel accelerant and increased temperature not burn off increased oil quantities at a the higher temperature? I'd be interested in your interpretation! <br /><br />Wo-Max, I'd argue your point that there is benefit to nitrous through the mid range power curve to top end. I am a barefooter and while hole shot is critical, once on plane @ 20 MPH the faster I can get to 40-42 MPH the sweeter the start. I would look at nitrous application being activated at about 2500 RPM through the mid range power curve and then switching down at about 5200 RPM which with my current 5 bladed S/S 19 pitch high five propellor is about 45 mph, by then the engine can do it's own job and not over rev. The engine pulled a strong 5700 RPM before con rod slop became an issue so I'm not worried about over reving for mid range accelleration. I'm only looking for a 50 HP "quick shot" I might check the NOS website...

 

[footer]

Re: Anybody hear of Marine Nitrous Oxide for Outboards?

Hey, DHadley, thanks for your insight. I spent some time last year in Indian Rocks Beach, outside of Clearwater doing a presentation to a Manufacturer, sure nice of the Gulf side. Which side are you on? Anyway, can you tell me briefly what you know about 2 stroke nitrous applications? You seem to know more about it than I do, do you think that NOS Systems makes an outboard application? Remember it's 2 stroke.. Triple carb application. You are right, the con rod cap had failed, but if I can make the rebuild bullet proof and she looks tight and can handle the load and I get compression up a bit, I wouldn't mind toying with the idea! That's what I'm doing right now, just trying to get some feedback from folks before I start looking around. I'd never seen NOS on an outboard before Monster Garage last night. Kinda peaked my interest! Any insight would be Cool!!

 

[vidar]

Re: Anybody hear of Marine Nitrous Oxide for Outboards?

ok... if fore use on mid range and electronic rpm control ok...you need 6nozzels fore nos and 6 fore fuel..one of eatch pr intake and electric fuel pump ...hoses and solenoides then you have to kalkulate nozzels to correct mix...and hp increase...fuel in nos system must contain oil....if jetted correctly it will not get any hotter but it will highly increase load as power is gained whit torque and not rpm...make sure your system is "soft hitting" .eg over 0.2 seconds before system is giving full power to ease gear train.... it will work well if engine can cope...

 

[vidar]

Re: Anybody hear of Marine Nitrous Oxide for Outboards?

ok... if fore use on mid range and electronic rpm control ok...you need 6nozzels fore nos and 6 fore fuel..one of eatch pr intake and electric fuel pump ...hoses and solenoides then you have to kalkulate nozzels to correct mix...and hp increase...fuel in nos system must contain oil....if jetted correctly it will not get any hotter but it will highly increase load as power is gained whit torque and not rpm...make sure your system is "soft hitting" .eg over 0.2 seconds before system is giving full power to ease gear train.... it will work well if engine can cope...

 

[footer]

Re: Anybody hear of Marine Nitrous Oxide for Outboards?

thanks for the info Wo-Max! does it look like I can find this in a kit form from a manufacturer, like NOS Systems or do I need to fabricate the "plumbing" and electronic fuel delivery myself?<br /><br />thanks,<br /><br />FOOTER

 

[Dhadley]

Re: Anybody hear of Marine Nitrous Oxide for Outboards?

We're about 80 miles south of Clearwater. Real nice.<br /><br />OK, the short version --<br /><br />Dont do nitros to a 2.4. Do yourself (and your wallet) a big favor. Use a 2.5. <br /><br />Nitros (N) itself will not burn. Bet that got your attention. But it makes everything around it burn because of the additional oxygen (O2). Good, right? Too a point. A nitros mix = a lean mix because of all the additional oxygen. Problem solved by adding a second solenoid. One for nitros and one for premix fuel and oil.<br /><br />All good again, right? Maybe. When you hit the button for NO2, its instant horsepower. No waiting. When you pop even an additional 25 ponies in there its not like it kicks in in a second, its NOW. Dont ya feel sorry for the gears?<br /><br />Ive seen it blow dampner plates off of sterndrive motors, turn inkanel valves almost inside out -- all kinds of "shocking" things.<br /><br />Just think about it.......

 

[vidar]

Re: Anybody hear of Marine Nitrous Oxide for Outboards?

give some of them a call and see what they say...you need them to calibrate your system anyhow...you can also contact sombody in the dragracing game...

 

[Chinewalker]

Re: Anybody hear of Marine Nitrous Oxide for Outboards?

I remember Land & Sea had a NOX kit for the V6 Mercs many years ago (my catalog is dated 1987) for use in drag boat applications. They had one running 130mph through the traps. Anyway, the motors were hand-built to take it - it's wasn't a simple-bolt on.<br /><br />Wouldn't simply dropping the pitch a bit and installing a rev-limiter of sorts increase your acceleration curve? Obviously, you wouldn't want to run flat out with too little prop, but if you're simply looking for acceleration to a set speed, you should be able to prop to that optimum acceleration curve - to a point....<br /><br />- Scott

 

[footer]

Re: Anybody hear of Marine Nitrous Oxide for Outboards?

Chinewalker, Wo-Max & Dhadley, thanks for your insight guys. The info on the nitrous is most interesting. I'd never heard of it on outboards before yesterday and was looking for some further insight, and I got it - Thanks allot. Chinewalker, you are right - I get very good (or did get) very good acceleration from my 200 merc, 19p s/s high five on an 18ft Sidewinder for barefooting and slalom skiing. The nitrous is one of those things I thought would be pretty trick and since I am doing a rebuild this winter thought it might be fun to look at. Short end of it is I need the performance and quite a bit of reliability also, not the best criteria for a NOS application. Think I'll probably just go 0.020" on the powerhead and oversize the pistons. Better to be back on the water sooner than later.<br />I really appreciate everyone taking the time to offer their thoughts and opinions on the NOS gig. Probably talk at ya all soon.<br /><br />FOOTER

 

[jim dozier]

Re: Anybody hear of Marine Nitrous Oxide for Outboards?

Maybe, rig a super charger.