Nitrous

Location
Ohio
I remember picks of that dude doing huge flatwater rolls before it was common.....He would only reveal the set up to the buyer....and then he sold the ski to someone who said they would tear it down and share all the info but I don't think they ever did..
 

NVJAY775

My home away from home.
I remember picks of that dude doing huge flatwater rolls before it was common.....He would only reveal the set up to the buyer....and then he sold the ski to someone who said they would tear it down and share all the info but I don't think they ever did..

That's about when I first became a member and I didn't know how to subscribe lol!! So I missed out on it. DAMMIT!! I just wanna watch...
 
Location
SW UT
Gonna ride after school tomorrow and check the engine compartment temperature to make sure it'll stay cool enough. Then hopefully my dad will help me setup the nitrous and get a ride to test it this weekend, all going well.
 
Location
SW UT
How so? Nitrous isn't flammable, and done right there's no issue and it's safe, especially if you are boosting to sea level performance as mentioned.
 

550/440

Maybe I'll get it all the way around NEXT time....
Location
Arizona!
Yea, I'm running a SOLAS 14-19 that watercraftsuperstore recommended to me last year when I just got into jet skiing, so I want to test the nitrous before I go and get a normal pitched impeller and see if it can pump all the water out of this thing. Then at altitude I'm only pulling 135psi with a high comp head and rebuilt engine (dads ski with stock head is at 115). So I have a lot of leeway if I screw the boost up.

Only issue I'm afraid of is that the impeller is so steep the engine will start to rev up when boosted and the driveshaft will start to twist.


Isn't the true concern the trapped volume instead of the PSI? 10:1 is still 10:1 at any elevation, isn't it? I'm not sure if you want to push the envelope on that without at least increasing your octane levels...
 
Location
SW UT
I care about air density in the cylinder, not volume. Yes, the volume is the same as sea level, and yes the compression ratio is the same. But the actual amount of gas in the cylinder is 20% less due to altitude. So as long as I calculate the amount of nitrous I'm adding relative to the amount of boost, I can safely keep the amount of pressure/air density in the engine at sea level equivalent, or keep the amount of extra horse power I'm boosting to plus the stock amount minus 20% (due to 20% less oxygen at altitude) at or below sea level equivalent--which ever I hit first. So either way, the max load on any part of the engine will be the equivalent of sea level.

Though yes, I will run 93 octane to be safe, though assuming I do my calcs right, there shouldn't be any issue at full load.
 

550/440

Maybe I'll get it all the way around NEXT time....
Location
Arizona!
Good deal, I've lived at sea level most of my life, and wasn't sure if it would have that much affect, blowing up motors isn't much fun...
 
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Location
SW UT
My nitrous is set to go, it's a cluster :):):):) in the compartment but I will shorten everything down later. Welded the bottle grip to a plate and bolted it to the hull, had to melt the gas tank and reform it so the bottle could easily slide in. The two solenoids and fuel pump are right next to the carb. Have the switch mounted so that it gets depressed when the throttle wheel is rotated into WOT.

Testing today, wet system with a 10hp boost. Bottle is ~9lbs filled, with 2.5lbs of nitrous in it, we'll see how long that lasts and how it performs.

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