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Nitrous Motors

  1. #15
    Senior Member hotbo's Avatar
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    Quote Originally Posted by Shaun View Post
    Was just hoping to get some info out of the guys here sprayin... There seam to be quiet a few of them. I'm not looking to spray anytime soon, thas probably well down the road with a different hull, who knows different motor. I was just curious as to what else might need to be done on a 200 shot system besides opening the rings up alittle more.

    well shaun compression plays a role.
    your compression will tell you what needs to be done for fuel and timing demands.

    other than that with 200 shot stock bottom end and rods can handle it.

    okay say you have good stuff anyway.thats even better.

    the biggest thing i have is make sure your fuel demands are up to par.
    play with timing.not by moving the dist.buy a retard box or a msd box with step retard function built in it.


    what kind of kit?they all say different fuel pressures and jets.remember these are just out of the box tune-ups.you can play with fuel and nos jets to best suite the demands,and best results you are after.

    read your plugs they will tell you what just went on after the nos pass.


    other than that shaun it will be hard to hurt a good built mill with a 200shot regardless of what you might hear.

    hell i have sprayed 200 many times with hyp.cast pistons and stock bottom end and never ever once did it act stupid or try to blow up.

    just pay attention,once you get it set,then have alot of FUN!!!!!!.

    it really is that simple.travis

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  3. #16
    I'm No Expert Shaun's Avatar
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    hotbo, thanks for the reply. My bottom end consists of a Scat Forged crank, Forged H-Beam Rods w/ L19 bolts (site claims they'll support 1500 HP), and forged coated mahle pistons. I cut the rings to the specs that they had in the instructions for 200 shot. My plan with this motor was to possibly run a NOS system on it one day. I was just curious as to when building a motor what other things should be taken into account, things that once a motor is assembled would be difficult/time consuming to change.

  4. #17
    Senior Member hotbo's Avatar
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    Quote Originally Posted by Shaun View Post
    hotbo, thanks for the reply. My bottom end consists of a Scat Forged crank, Forged H-Beam Rods w/ L19 bolts (site claims they'll support 1500 HP), and forged coated mahle pistons. I cut the rings to the specs that they had in the instructions for 200 shot. My plan with this motor was to possibly run a NOS system on it one day. I was just curious as to when building a motor what other things should be taken into account, things that once a motor is assembled would be difficult/time consuming to change.
    well shaun you have nothing to worry about.

    as far as a already built mill.if the ring gaps were not opened up for nos and you planned on spraying,its 50-50 chance you might be okay?

    rings would likely butt up if you stayed on the button for extended periods.

    other than that make sure your valve train can handle the additional rpms.

    if you have hyd liftes thats something else to consider.higher rpm will pump them up.

    last month at scotts marine a guy came in with a 555 scott shaffrof (sorry for the mis-spelling)motor hyd roller cammed wanted to spray 250 on it.he was already turning the impeller 6300 rpm,which in my book is pushing hyd.lifters on extened runs.

    so he impellerd the boat so off the spray it would turn less and with the shot he turned it no more than what he was turning before or close to it.

    on the spray he ended up turning 6350 and off was around 5400 rpm if i rememeber correctly.so the guy was happy.

    maybe not the best thing to tune for but it works without tearing his mill apart and hes happy.boat runs around 110 this way.

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  6. #18
    mo balls than $cents$ IMPATIENT 1's Avatar
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    nitrous ring gap is bigger than all the rest, blown/turbo/na/etc

    Dare to be different, if it turns out great you can claim you planned it that way.

    Jetboatperformance.com

  7. #19
    I'm No Expert Shaun's Avatar
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    My engines a solid roller deal. It made peak HP at 5800. When i talked with straub about the engine we figured 5800 off the bottle and 6200-6300 on.

  8. #20
    Senior Member hotbo's Avatar
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    Quote Originally Posted by Shaun View Post
    My engines a solid roller deal. It made peak HP at 5800. When i talked with straub about the engine we figured 5800 off the bottle and 6200-6300 on.

    150 will generally net you 500rpm maybe a slight bit more
    200 100-150 more rpm depending on tune.

    hope this helps.no expert but i have learned that nos is not just fun as hell,but can be very safe if you pay attention.good luck

  9. #21
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by Shaun View Post
    My engines a solid roller deal. It made peak HP at 5800. When i talked with straub about the engine we figured 5800 off the bottle and 6200-6300 on.
    just make sure the cams peak is where the nitrous puts it, otherwise you'll notice it drop off on the big end on nitrous or no noticeable top mph difference went thru that myself last summer and ended up backing the nitrous down to cam peak and left it there, i was just waste'n nitrous the other way

    Dare to be different, if it turns out great you can claim you planned it that way.

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  10. #22
    I'm No Expert Shaun's Avatar
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    Quote Originally Posted by hotbo View Post
    150 will generally net you 500rpm maybe a slight bit more
    200 100-150 more rpm depending on tune.

    hope this helps.no expert but i have learned that nos is not just fun as hell,but can be very safe if you pay attention.good luck
    Probably why he told me 6200-6300 on the bottle, think i was telling him at the time i was thinking 150 shot.

  11. #23
    I'm No Expert Shaun's Avatar
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    Quote Originally Posted by IMPATIENT 1 View Post
    just make sure the cams peak is where the nitrous puts it, otherwise you'll notice it drop off on the big end on nitrous or no noticeable top mph difference went thru that myself last summer and ended up backing the nitrous down to cam peak and left it there, i was just waste'n nitrous the other way
    There was a thread about this, and that is what i was trying to say/figure out in the thread asking some of the guys to post dyno sheets. Seamed like if the motor made peak at a specific rpm then thats the rpm you would want to run at while on the juice. That was just my logic, there's no real experience at all behind that. Would be cool to see some before/after dyno sheets to see what happens to the curve.

  12. #24
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by Shaun View Post
    There was a thread about this, and that is what i was trying to say/figure out in the thread asking some of the guys to post dyno sheets. Seamed like if the motor made peak at a specific rpm then thats the rpm you would want to run at while on the juice. That was just my logic, there's no real experience at all behind that. Would be cool to see some before/after dyno sheets to see what happens to the curve.
    i don't have any dyno sheets, but i was sprayin 450hp in 2stages in my gullwing and when i'd bring in the 2nd stage , rpms would go over peak and i would have to let outta it by 1/2 track to let the motor settle back to peak, sob would start pulling harder again after that i knew my cam was peaking just above 7k so i impellored it till i could run the 450hp shot and stay near that peak, boat did sooooo much better that way you can do the same if you end up above peak on the nitrous level you wanna run, just stick a bigger impellor in till wot is at peak on cam when on the juice. makes for a meaner holeshot anyways

    Dare to be different, if it turns out great you can claim you planned it that way.

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  13. #25
    I'm No Expert Shaun's Avatar
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    well so far it looks like my motors going to turn this new impeller i have around 5400 RPM.. And once detailed it sounds like it will be a few hundred rpm lower... So with the juice that might get me up at where i need to be. Doubt i'll do that, probably will get this impeller cut to where i need it for all motor right now... NOS is down the road on a different hull.

  14. #26
    Boat 502 76Miller's Avatar
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    Quote Originally Posted by Shaun View Post
    well so far it looks like my motors going to turn this new impeller i have around 5400 RPM.. And once detailed it sounds like it will be a few hundred rpm lower... So with the juice that might get me up at where i need to be. Doubt i'll do that, probably will get this impeller cut to where i need it for all motor right now... NOS is down the road on a different hull.

    On a different hull ?? Why ? I thought your goal was hitting a 100mph ? You have spent alot of time and money on this hull, and a 150-200 shot is whats going to really make it run. Believe me, I went through it with my Miller. I was making over 800hp, w/ every bell and whistle on my MPD built pump, 540lb. hull, blueprinted bottom, yada, yada ..... and only got 102mph on the motor. On the bottle, the thing was a handful. It was only 5-6 mph faster, but it was waaaay quicker. Not saying your boat won't run well, but any tunnel, CP, or flat w/ your same power will walk you everytime. You put a unit on your boat, and you will have way more fun and win way more races. Then when your done with all the slow boats in Parker....come to the other side
    Last edited by 76Miller; 07-30-2009 at 10:17 PM. Reason: sp

  15. #27
    I'm No Expert Shaun's Avatar
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    Dont think i ever said my goal was to hit 100, would be cool though. I've set out to make this boat as fast as possible problem right now is that saftey is really a big concern of mine. I have kids and a new one on the way so i need to be as safe as possible. Right now my boats all outta wack and i need to get it dialed in. One big concern right now is that i've only had it out once and the bottom infront of the intake where the intake used to be is cracking. jack's not seen a boat do that before and told me to keep a close eye on it. A new hull has always been in my future, just a matter of when.

  16. #28
    grumpy old guy 3boatpaul's Avatar
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    200 shot of nos is only an added 25 hp per cylinder not much of a problem BUT in larger amount's touchey i agree with hotby's post #17 and impatient's post #21
    i have run well over 600 hp nos with alky enrichment systems BUT every thing has to
    spot on . just one weak or wrong part combo and thing's can get terribley expensive . ( once had a no2 sol. hang open at the end of the run and when i let off the gas the top of my 2-4 manifold and carb's went for ther own ride . NOTE blower restraint straps on a nos motor just might keep the manifold top from comming you'r way . learned this the hard way , throttel cable brought it my way .

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