N2O... high or low compression?

[MXrider22]

I figure logically since N2O just shoves more oxygen in your engine at a denser rate (nitrogen makes the oxygen molecules freezing cold so it condenses) and that N2O itself does not raise compressoin(like a turbo or supercharger) that having High compression (to a certain extent 10.5-11:1) and N2O would be safe for a street car, and in comparison something like running 4-5psi on a turbo with an intercooler that has about a 400% effiecency rate. Does this make any sense?... even if my turbo analogy is a way off... can someone please just answer the question... would semi-higher compression in the 10.5-11:1 range and a small shot (35-65) of N2O be safe? (assuming the block has been resleeved with new rods and pistons)? BTW i have a 92 prelude Si, H23

[akina_speedstars]

Two things.
1. Nitrous oxide systems do not shove more oxygen into your engine. It's more of a symantic error than a technical error. Your engine breathes in the same amount of air whether you are adding nitrous or not. It's just that when you inject nitrous oxide, there is more oxygen present to burn more fuel as opposed to the air that comes from the outside. Turbos and superchargers shove more air into your engine.

2. Nitrous is safe (safe as in it won't blow up your engine if you drive properly and have properly installed a quality nitrous system) with either high or low compression engines.

[MXrider22]

[quote=MXrider22]I figure logically since N2O just shoves more oxygen in your engine at a denser rate.

Thanx for the help, but i never said anything about taking in more air lol. Just Oxygen, and maybe cramming it in there was a bad way of saying it as the air goig into your engine is more oxygen dense with N2O. But you answered my question so with a safe wet 55shot on 11:1 compression its street so im going to be running 93octane.... i would be safe and not break anything (with moderate usage not runnin it all the fricken time)

[MXrider22]

[quote=MXrider22]I figure logically since N2O just shoves more oxygen in your engine at a denser rate.
Thanx for the help, but i never said anything about taking in more air lol. Just Oxygen, and maybe cramming it in there was a bad way of saying it as the air goig into your engine is more oxygen dense with N2O. But you answered my question so with a safe wet 55shot on 11:1 compression its street so im going to be running 93octane.... i would be safe and not break anything (with moderate usage not runnin it all the fricken time)

[MXrider22]

"I figure logically since N2O just shoves more oxygen in your engine at a denser rate."

Thanx for the help, but i never said anything about taking in more air lol. Just Oxygen, and maybe cramming it in there was a bad way of saying it as the air goig into your engine is more oxygen dense with N2O. But you answered my question so with a safe wet 55shot on 11:1 compression its street so im going to be running 93octane.... i would be safe and not break anything (with moderate usage not runnin it all the fricken time)

[boosted331]

If you want to do a high-compression nitrous setup best way to go, imo, is to run as high of compression as you can on your highest octane (if you get 93/94 octane i'd go with 12:1, if you get 91 i'd stay to 11:1-11.5:1) pump fuel, then run a small fuel cell in the trunk filled with race gas and run the nitrous sytem off that. That way if you're out cruising you still have good N/A power, but if someone wants to race you can run em straight up with a bigger (>100HP) shot of juice without needing to totally fuel up on some race gas.

[MXrider22]

So what your saying is run 2 seperate tanks... the stock tank AND a small cell in the trunk... and when i want to run the bottle.. wtich over the race fuel... Question though, if i could run the 11:1 off 93 ocatne in the first place... why would i have to up the octane to run N20??? and if i did...if i didnt use the race fuel in the cell would it go bad after a month or so... and how could i do that just switch back n forth at say a stoplight or something

[boosted331]

Originally Posted by MXrider22

So what your saying is run 2 seperate tanks... the stock tank AND a small cell in the trunk... and when i want to run the bottle.. wtich over the race fuel... Question though, if i could run the 11:1 off 93 ocatne in the first place... why would i have to up the octane to run N20??? and if i did...if i didnt use the race fuel in the cell would it go bad after a month or so... and how could i do that just switch back n forth at say a stoplight or something

Yes, you can easily run 11:1 off of 93 octane. You can run as high as 12.5:1 on 93 octane with good results. You need to run a higher octane fuel with nitrous just as you do with boost. It increases cylinder pressures and cylinder temps, which can lead to detonation if you don't have enough octane, or havn't pulled any timing, or arn't running colder plugs. Race fuel can go bad, but I have a drum of C16 sitting in my garage i've had it in there for over a year and the gas is still fine, so it should be ok running a 4-gallon cell in your trunk. Normally on a nitrous setup you don't run the fuel cell up to the main line and cut off the supply of 93 octane, that would be a waste if your motor runs fine on 93 octane. You run a seperate fuel pump out of the fuel cell, run it to a fuel pressure regulator with a return line, and from there right to the nitrous fuel solenoid. The motor contines to run on gas from your original gas tank, and the nitrous kit injects race gas.

[MXrider22]

So your saying run a wet kit which will inject the nitrous and the RACE fuel not the 93octane... but wouldnt that meen that id be running nitrous C16 and pump gas all at the same time.. What kind of effect would that have... mixing C16 with 93 octane and throwing N2O on that fire??? Has anyone ever done this that i can talk to

[boosted331]

Originally Posted by MXrider22

So your saying run a wet kit which will inject the nitrous and the RACE fuel not the 93octane... but wouldnt that meen that id be running nitrous C16 and pump gas all at the same time.. What kind of effect would that have... mixing C16 with 93 octane and throwing N2O on that fire??? Has anyone ever done this that i can talk to

Yep, you got it right on the first part. No problem mixing pump gas C16 and juice, lots of people will mix a few gallons of C16 with a few gallons of pump gas in the main tank (mostly turbo people GN's, supras, sy/ty's, etc) and it has no adverse effects other than it clogs cats and will eat up O2 sensors. I ran a setup exactly like i'm describing to you with my old setup had a dart block 414 inches 10:1 compression ran a NX hitman plate jetted @ 150 HP for my first stage and a NX proshark 4 noid direct port kit jetted @ 300 HP and I used a nitrous maximizer to "bleed" the nitrous in, the full 150 HP first stage hit @ 3000 rpm's then the additional 300 HP hit ramped up progessively from 3500-4700 RPM's. Worked like a charm and made a hell of a lot of power, but I got sick of filling the bottles.

[MXrider22]

So i could run 11.5:1 comp (being safe dont wanna go to 12 or 12.5) with built internals like pistons, rods, i wanna run cam and then get a decked out head job, i could run say a 75wetshot (NX) but run the C16fuel with the NX setup? if so sounds like a nice 250-300hp setup, not to mention i could roast alot of the crap around here (damn civics) lol

[boosted331]

Originally Posted by MXrider22

So i could run 11.5:1 comp (being safe dont wanna go to 12 or 12.5) with built internals like pistons, rods, i wanna run cam and then get a decked out head job, i could run say a 75wetshot (NX) but run the C16fuel with the NX setup? if so sounds like a nice 250-300hp setup, not to mention i could roast alot of the crap around here (damn civics) lol

If you're going to run a 75 shot don't waste your time on the rods or sleeving or the secondary fuel cell setup. With rods and pistons spraying with C16 you should be able to run a 150-200 HP hit of juice.

[MXrider22]

That could be fun, the motor making around 200-220 on its own, then run a 150shot... i wouldnt get beet by too many people thats for sure, i could only activate it once i already passed like 60-70 cuz id break loose in 1st 2nd or 3rd gear. But it sounds like an awesome setup, ive got some $ saving to do... But 1 more question... The stock H23 Sleeves... i know its a closed deck block, but how much can those things handle?.. cuz a golden eagle resleeving would make for some killer insurance, but im not so sure about 1000$ in insurance