aggravation

Back when my friends and I were young, 10 feet tall and bullet proof growing up in west Texas we did some crazy stuff with all sorts of dangerous toys from home made canons, cases of dynamite, to airplanes flying way too low... to shooting at each other with 12 gauge shotguns "from a safe distance"...

So in the spirit and vernacular of my youth I raise a cold Dos Equis to Brett and say "YEEEHaaaaW! Go get some Dude!!
Anything you can walk away from is a victory!!!

Brett928S2

Hi

Thats ok lol...

138,000 but I have taken the plenum off once (well actually in my early Nitrous days it sort of popped off when my son hit a Nitrous switch while I was working on the engine

But I did put it back on again

AND its had a new cambelt/water pump so its all fine now

AND I change the plugs every 2 or 3 months (Nitrous eats plugs)

So almost brand new

All the best Brett

Z

Doesn't matter. The point was that the displacement is the same before and after the nitrous.

I know exactly how it works, and have since even before I started using it in automotive applications 25 years ago.

Mostly nitrogen, but it really doesn't matter since it doesn't contribute to the oxidation of the fuel, which is what makes power.

You can change the composition of what fills the glass. From a substance containing 21% oxygen, to one containing 36% oxygen. You can't get more than 12oz of 36% oxygen in there normally aspirated using nitrous though. Run liquid oxygen in your nitrous system instead of nitrous and you'll be close.

Brett928S2

Hi

Not going to give a lecture on Nitrous, although people in the UK seem to like mine....

But I will give you a hint....then I am off to bed as its 3 am here

Nitrous runs at 950 psi....now what would that do to your 12 oz "theory"

Oh by the way, I did consider liquid oxygen as I have worked with it before but its a little too unstable for me

Much too risky ...I do so like to be sensible

All the best Brett and goodnight all

hacker-pschorr

Here, let's bring everyone up to speed:

dprantl

All this trouble, and you would not even try to be the fastest Porsche *in the world* instead? And by how much, a measly 4 mph?! You need to be faster than 224mph my friend:

http://videos.streetfire.net/video/C...6D0090EEE3.htm

Also, I think it would be much safer if you swapped in a 5-speed transmission with a 2.2 rear end. You would be at ~215mph at stock redline with stock tire size. Increase tire size a little and you wouldn't even need to mess with the rev limiter.

Dan
'86 928S 5-spd w/LSD

dprantl

Oh, and another thing. I hope you are going to glue the tires to the wheels. With that kind of power and drag, you may start spinning them...

Dan
'86 928S 5-spd w/LSD

Wade T

Amen. It's the law disimished returns reguardless of how much N2O is added.

Crisis

Hey Hacker, nice videos. Exactly how much free time do you have on your hands?

hacker-pschorr

I didn't make the videos.

mark kibort

the greatest torque will be in 1st gear, so in 5th gear, the forces are pretty mild in the tire, wheel, and CV joint department
mk

mark kibort

I cant even begin to count the number of factors that were left out in this proposed limitation.

for one, nascar gets near 800hp with that same 21% oxygen out of only 5 liters, plus the pesky .7liters extra.

second, what about the density! remember its cold, really cold.

If we look at the air flow, we are looking at near 500cfm at near redline.
does that 500cfm have 500cfm of 70 degree air or is it something less.

With NOS that 500cfm can made up with air density quite a bit higher. Ill have to check the charts, but i think there is no reason an engine couldnt make 2000hp if it could stay together.

mk

Z

That's the pressure WHEN IT'S IN THE BOTTLE AND LINES. I guess maybe you're planning to drop miniature bottles of compressed nitrous into the intake of the running engine. At this point, that really wouldn't surprise me at all.

He could put a 10,000hp nitrous system on there and it wouldn't make any more power. At some point, well before 1,350hp, the maximum possible amount of nitrous will be ingested by the engine, and any more will just come blowing out of the intake tubes above the radiator. He may as well say that he's going to make 1,350hp by just putting on a 15" diameter throttle body.

mark kibort

a bottle of NOS is only a couple cubic feet, yet it holds 10lbs of "air". or, 14 x 14 second shots of 50hp. OR, 14 x 7seconds of 100hp, 7 x 7 seconds of 200hp, or 7 x 1 second of 1400hp. What this means is that the entire bottle could empty in the volume available in our 5 liter engines. After all at 500cfm, is 8 cubic feet per second. If a bottle is only 1cfm, you could see that it could dump 8 times this rate if it had to. (minus the fuel that is only a 1/12th the mass of the air or NOS). Of course there is some variables there with the NOS hitting the atomosphere and turning to vapor, albeit, very cold vapor!

I think this is what Brent is illuding to.

I think at worst case, if an engine is at 100% volumetric efficiency, and its 5 liters, just using the nascar standard, we could be looking at 700hp. (minus other factors such as compression ratio, etc) But, just use this for the concept.
all we would then need to do would be to inject air that was 2x as dense as normal air. NOS, being as cold as it is as a vapor, would have no issues meeting that level of density.

simple use of gas law could give you an idea of what you would have as far as mass flow. After all thats what it is all about

Mk

Fabio421

I found a video of Brett's early experiments with N2O.