[78T/a]

Hey Everyone

Was just sitting here trying to figure out my new engine combo, and was wondering, is a 100 shot of nitrous always 100 hp regardless the engine combination naturally aspirated. For instance, If I were running stock heads on lets say a 400hp engine combo, compared to running a fully ported aluminum head 600+ engine, is a 100 shot always a 100 when added to either engine

Thanks
Mike

[David Holmberg]

No, it's a general rating. The air fuel rating, bottle pressure, cylinder pressure, cam, ect all play a part.

[78T/a]

Originally Posted by David Holmberg

No, it's a general rating. The air fuel rating, bottle pressure, cylinder pressure, cam, ect all play a part.

Okay, thats kinda what I was thinking. But I guess what I am wondering is regardless of the power an engine makes naturally, you can still add nitrous to achieve that 100+ shot

[David Holmberg]

Actually a low compression motor will pick up more than a higher HP engine that is well tuned. There is just too many variables to say exactly, but for a low shot like a 100hp, most should respond about the same.

[78T/a]

Originally Posted by David Holmberg

Actually a low compression motor will pick up more than a higher HP engine that is well tuned. There is just too many variables to say exactly, but for a low shot like a 100hp, most should respond about the same.

Yah I have been reading abit and anything 100-150 like you said seems to be a good general shot that averages about the same. Popular hot rodding had a good article about it, seems to cover a good amount of info. They mention an engine with less intake volume in the heads will respond well for a street engine, which is what I was wondering because I would be running the shot on stock port heads, before I can afford some ported aluminum's

[David Holmberg]

What cam are you running?

[78T/a]

cam selection has not been made yet. I have a assembled short block that is awaiting a direction.

[David Holmberg]

Ok, I was looking at the combo in your sig.
For a 100 shot choose based on best performance on motor. If you're going above a 150 shot a nitrous cam will give better results.

[78T/a]

Originally Posted by David Holmberg

Ok, I was looking at the combo in your sig.
For a 100 shot choose based on best performance on motor. If you're going above a 150 shot a nitrous cam will give better results.

I won't be running the combo in the sig, I am putting together a whole new engine, a 455/468. I just don't have the funds to purchase alum heads at this time, and build a stout N/a Combo. So I was thinking of running some slightly milled 6x8 heads and just hit it with some nitrous to achieve my 1/4 mile goals all in the while saving up to buy some alum heads.

Just curious, if a cam was more tailored to work well with nitrous, what would the effect be on normal street driving, without nitrous

[Tom Vaught]

A guy named Mike Thermos helped me with a project one time. He was the brains at NOS apparently. I asked him the same deal about the 100 HP NOS addition on two different engines. A Ford 351 CID engine and a 5 HP Briggs and Stratton engine.

He said both would have a 100 HP increase in power but the Ford engine would live longer, LOL!

Tom Vaught

[78T/a]

Originally Posted by Tom Vaught

A guy named Mike Thermos helped me with a project one time. He was the brains at NOS apparently. I asked him the same deal about the 100 HP NOS addition on two different engines. A Ford 351 CID engine and a 5 HP Briggs and Stratton engine.

He said both would have a 100 HP increase in power but the Ford engine would live longer, LOL!

Tom Vaught

hahaha, thats would be cool to try though.

I just kind of figured that the nitrous' power increase to an engine was a by-product of what the nitrous did in the combustion process. So I guess in theory a 100 shot can be added to any engine, it is just a matter of which engine is going to utilize a specific amount of nitrous more efficiently

Thanks
Mike

[David Holmberg]

Ok...

In theory a .047 nitrous jet and a .xxx fuel jet = 100HP. (fuel makes the HP not the nitrous)
Just like one ounce of 151 Bacardi = x amount of alcohol.

Their effects will depend on their victim.

The effects of a one ounce shot will be much different between a 90 lb 21 yr old girl and a 240 lb 40 yr old male.

Like I said before, no matter what your rated input of nitrous/fuel is, the output will depend on a series of variables. I have done this on the dyno and at the track many times.

You mentioned using a "large" shot with the new combo, call Pontiac Dude (Ken's Speed and Machine) and he'll set you up with the right cam.

Good luck.

[78T/a]

Originally Posted by David Holmberg

Ok...

In theory a .047 nitrous jet and a .xxx fuel jet = 100HP. (fuel makes the HP not the nitrous)
Just like one ounce of 151 Bacardi = x amount of alcohol.

Their effects will depend on their victim.

The effects of a one ounce shot will be much different between a 90 lb 21 yr old girl and a 240 lb 40 yr old male.

Like I said before, no matter what your rated input of nitrous/fuel is, the output will depend on a series of variables. I have done this on the dyno and at the track many times.

You mentioned using a "large" shot with the new combo, call Pontiac Dude (Ken's Speed and Machine) and he'll set you up with the right cam.

Good luck.

Good way of putting it LOL. I totally get it now LOL.

If I were to run stock port heads, how well does nitrous react to these. Im just trying to decide if stepping up to ported aluminum heads to achieve a desired output for the track is worth the extra $$ upfront, vs. running nitrous just at the track to acheive the same desired output

Okay I will talk to Ken

Thanks
Mike

[69GTO2]

Been awhile.

In regards to a 100 HP shot, assuming the same system, same jets, same pressures, timing etc. isn't the 100 HP+/- shot nominaly the same 100 HP+/- at all RPMs?

Meaning activating the nitrous at a lower RPM say 3k will provide a much larger torque increase and cylinder pressure rise than starting at 5k? As HP=Tork x rpm / 5252.

[HWYSTR455]

[QUOTE=David Holmberg;4750808]

Their effects will depend on their victim.

The effects of a one ounce shot will be much different between a 90 lb 21 yr old girl and a 240 lb 40 yr old male.

[QUOTE]

I think you need to send over a 90lbs 21 yo victim for testing purposes!

I believe the 'general' basis of the HP claim is based off a Chevy 350.

.

[ventura7211]

Originally Posted by HWYSTR455

I believe the 'general' basis of the HP claim is based off a Chevy 350.

The power comes from the fuel jet, but you do not make more power by simply adding a bigger fuel jet, you have to add a bigger nitrous jet to be able to burn the extra fuel, so the HP numbers are based off the nitrous jet.

So, the general HP numbers in standard kits are based off average flow in PPH (pounds per hour) over however many kits the company decided to flow with that jet in a plate or in direct port form then used a conversion to break it down in a easily digestible manner of adding HP. The flow can very given the same size jet with the same style plate or fogger, the "HP" added can also vary as between "20-100ish+ HP" with everything being the "same".

The simplest formula is total lb/hr /4 = HP

The "HP charts" get you "in the ballpark" so to speak as to how much you are adding similar to where to start with flowing fuel pressure, how much timing to pull "per 50", etc with standard kits. It helps a novice or those just learning how to tune or set things up as dealing with adding 100, 150, 200, 250 hp, is easier than adding 850 lb/hr, 1050 lb/hr, 2890 lb/hr and we haven't even discussed how it changes during the run.

By the time you "have to know" what your kit flows as you are using jet maps "not standard" you should be able to read the plugs well enough the engine will tell you what it wants, you will learn this from using your first first standard kits recommendations and tuning it to clean tune up by, reading the plugs...

Worst thing out there is the myth that rich is safe, nothing destroys a nitrous engine faster, well too much timing is close second...

[Engo]

x2

The formula mentioned above lbs/h /4=hp is only an approximation but will still get you an idea of how much there is to get out of it.

Also realize that the nitrous you add in the intake tract will decrease the NA airflow thru the engine. For example if the engine puts out 500hp NA and you add a typical "150" shot it is not likely that the engine wilt put out 650hp but more likely less than 650hp.

[n2ogpsj462]

My old combo (and most fun) was similar to yours. 400 stock 62s 041 cam would go 13.60. 100shot and 12.00s ALL DAY. Amazing pickup on a small shot. Tried bumping it to 150 and barely hit 11s. 11.96 if I recall. Never could figure that out. Just an example about different combos doing different things