Nitrous

motoman96

motoman96

Banned
Location
Lodi Cali
If you have a motor built the right way, there's no need for nitrous. Plus it'll over-rev your motor extremely fast if it's still going an the pump comes out of the water. The risk is nowhere near the reward, which I don't really see any reward. How are you richening up the carbs for when your using the nitrous??
 
WaveDemon

WaveDemon

Not Dead - Notable Member
Location
Hell, Florida
motoman96 said:
If you have a motor built the right way, there's no need for nitrous. Plus it'll over-rev your motor extremely fast if it's still going an the pump comes out of the water. The risk is nowhere near the reward, which I don't really see any reward. How are you richening up the carbs for when your using the nitrous??
Click to expand...
the system that injects nitrous also injects more fuel. I think it's a legitimate option on flat water boats.
 
motoman96

motoman96

Banned
Location
Lodi Cali
Right but those are using electronic solenoids, where are you putting the spray nozzles an tying into the fuel system? Running a separate pump to just supply the fuel solenoid?
 
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scotte

scotte

Location
nebraska
My nozzles are in the manifold.
Separate fuel bottle, high octane mixed 20:1.
No separate pump, boss noss uses one nozzle, the nitrous controls the fuel. Works great!
 
Snivilous

Snivilous

Location
SW UT
I have a wet nitrous kit I'm installing into my 650sx this week. As the above guys slightly touched on, a wet kit will inject fuel to compensate for the increased oxygen being injected (nitrous being 33% oxygen) so that the carbs will remain tuned despite the increased oxygen. My kit is setup so that the fuel pump is connected to a T in the fuel line going to the carb. I am not using nitrous for top end power, but for lots of bottom end torque. I will start at a 10hp boost, which at the altitude I ride (5000 feet) will roughly bump me to a sea level equivalent power output. My solenoid/pump switch will contact the end of the throttle arm and be spring loaded, so that the throttle will have a distinct "tightening" indicating that WOT is about to be hit, which will also engage the solenoids/pumps (assuming the arming switch is open).

This is the kit I'm using: http://nitrousdirect.com/motorcyclekits.html

It's designed for a single carb motorcycle and comes with everything for $500 including a 2lb bottle. Though I already did considerable research beforehand since I was planning on building a system from scratch.

Again, I will be starting with a 10hp boost which even if left on will only be the equivalent amount of work on the engine as if it were at sea level. I just want to see how it works, and see if I can throw out all the water that's in the pump during a 0-3 second "pop" of nitrous. I am also interested to see how the expansion chamber (Factory Pipe in my case) will resonate when it's getting the boost. My bet being that it will resonate fine with the increased 66% nitrogen output (since the atmosphere is 78% nitrogen to begin with).
 
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AtomicPunk

AtomicPunk

Lifetime bans are AWESOME
Site Supporter
Location
Largo, Fl
Snivilous said:
I have a wet nitrous kit I'm installing into my 650sx this week. As the above guys slightly touched on, a wet kit will inject fuel to compensate for the increased oxygen being injected (nitrous being 33% oxygen) so that the carbs will remain tuned despite the increased oxygen. My kit is setup so that the fuel pump is connected to a T in the fuel line going to the carb. I am not using nitrous for top end power, but for lots of bottom end torque. I will start at a 10hp boost, which at the altitude I ride (5000 feet) will roughly bump me to a sea level equivalent power output. My solenoid/pump switch will contact the end of the throttle arm and be spring loaded, so that the throttle will have a distinct "tightening" indicating that WOT is about to be hit, which will also engage the solenoids/pumps (assuming the arming switch is open).

This is the kit I'm using: http://nitrousdirect.com/motorcyclekits.html

It's designed for a single carb motorcycle and comes with everything for $500 including a 2lb bottle. Though I already did considerable research beforehand since I was planning on building a system from scratch.

Again, I will be starting with a 10hp boost which even if left on will only be the equivalent amount of work on the engine as if it were at sea level. I just want to see how it works, and see if I can throw out all the water that's in the pump during a 0-3 second "pop" of nitrous. I am also interested to see how the expansion chamber (Factory Pipe in my case) will resonate when it's getting the boost. My bet being that it will resonate fine with the increased 66% nitrogen output (since the atmosphere is 78% nitrogen to begin with).
Click to expand...

Bro, I gotta hand it to you, I only thought WFO would put nitrous on an SX....

Have fun, let us know how it works.
 
509freerider

509freerider

Location
Spokane, Washington, United States
Can't wait to see how it works! I used to run a 50hp shot in my snowmobile and it was very reliable once I switched out to Wiseco pistons. I used a Mikuni high volume duel fuel pump and ran one side to my carbs and the other to the nitrous system. The only thing I think would be hard in a ski is to get the correct impeller, almost need to over pitch a bit to compensate for the NOS hit, but its not a lot different than a sled with the clutching, I would just use larger weights and a steeper helix. Once you get the setup correct there is nothing like NOS! Another thing is depending on what compression you are running already, you may want to run race fuel or at least a mix, nitrous will increase your compression like crazy, and thats were people end up breaking pistons.
 
Snivilous

Snivilous

Location
SW UT
509freerider said:
Can't wait to see how it works! I used to run a 50hp shot in my snowmobile and it was very reliable once I switched out to Wiseco pistons. I used a Mikuni high volume duel fuel pump and ran one side to my carbs and the other to the nitrous system. The only thing I think would be hard in a ski is to get the correct impeller, almost need to over pitch a bit to compensate for the NOS hit, but its not a lot different than a sled with the clutching, I would just use larger weights and a steeper helix. Once you get the setup correct there is nothing like NOS! Another thing is depending on what compression you are running already, you may want to run race fuel or at least a mix, nitrous will increase your compression like crazy, and thats were people end up breaking pistons.
Click to expand...

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.
 
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