Nitrous basics
- Thread starter Diesel power
- Start date
super diesel
<<<< Under Pressure
LOL Michael.....I can't
It hasn't been with a Dmax so it doesn't count!! :rofl:But seriously, yes, I have been playing with nitrous on diesels for years. Been though turbos, pistons, engines, etc. It's a very fine balancing act to get it to perform optimally and safely. I think the biggest problem with trying to explain or help someone with it is that there are so many variables between vehicles that what setup works well on one, does not on another. It takes alot of individual time and tuning to find the "sweet spots" for each truck due to only slight differences in fueling, programing, etc. Most people don't want to take that time. That is where the problems and mis-information come from.
any ideas about where to inject, pre turbo, pre intercooler post intercooler?? Which makes the best gains and which is safest?
super diesel
<<<< Under Pressure
LOL Michael.....I can't
But seriously, yes, I have been playing with nitrous on diesels for years. Been though turbos, pistons, engines, etc. It's a very fine balancing act to get it to perform optimally and safely. I think the biggest problem with trying to explain or help someone with it is that there are so many variables between vehicles that what setup works well on one, does not on another. It takes alot of individual time and tuning to find the "sweet spots" for each truck due to only slight differences in fueling, programing, etc. Most people don't want to take that time. That is where the problems and mis-information come from.
Very good points. Have you had very few problems with melted pistons, or did you see this frequently on your 7.3? I think this is very importaint because or the aluminum alloy of most pistons make up and the weekened state from the higher EGTs they are at. Then add the pressures of combustion on top. I was seeing errosion. Where did you find it most beneficial to spray (pre or post I/C or pre compressor if you tried these different areas) with the least amount of after math?
Last edited:
ok, I get 82 KJ/mol given for Ht of formation, 44g/mol, and .95 BTU/KJ. Heat capacity of these gases is .25 BTU/lb-F
exothermic release of 803 BTU/lb. That's nasty. If it is used equally with air, then the rise is going to be 1600 F. One lb of nitrous with 4 lbs of air=640 degree rise.
Hopefully I didn't embar-"ass" myself here.
exothermic release of 803 BTU/lb. That's nasty. If it is used equally with air, then the rise is going to be 1600 F. One lb of nitrous with 4 lbs of air=640 degree rise.
Hopefully I didn't embar-"ass" myself here.
super diesel
<<<< Under Pressure
if the numbers are valid, does this explain the EGT rise complaints? I am assuming you guys saying that nitrous=egt trouble is correct. I've never tried it myself, just getting up to speed on the realities before I dive in.
I am trying to wade through a lot of information to figure out what is happening.
Is there any indication that egt is better with one location or the other?
It requires 570F or so do decompose. I have seen that much heat in the boot tube, but I doubt it could be obtained with pre-C spraying, just because of the charge cooling. But needless to say, pre-CAC decomp would be very bad, that added heat would make for a big restriction when the velocity increases from the increased volume/decreased density.
I see most users spray right near the valves to get the much denser liquid form into the cylinder. That makes sense, it can then expand and decompose internally, where the heat release can be made most useful.
Is there any indication that egt is better with one location or the other?
It requires 570F or so do decompose. I have seen that much heat in the boot tube, but I doubt it could be obtained with pre-C spraying, just because of the charge cooling. But needless to say, pre-CAC decomp would be very bad, that added heat would make for a big restriction when the velocity increases from the increased volume/decreased density.
I see most users spray right near the valves to get the much denser liquid form into the cylinder. That makes sense, it can then expand and decompose internally, where the heat release can be made most useful.
somebody will have to help me if I mess this up, but I post-decomp gas is inert, more or less, to aluminum. IIRC, it is N2O that is damaging to aluminum in the presence of heat.
???
So you agree if we can get it to seperate in to N2 and O2 in the boost tubes it wont hurt the pistons?
High EGT's are useally from not spraying enough nitrous, unless there is a exhaust restriction .I.E camshaft, turbo housing, manifold, exh porting/shape. valve angle ECT....... These are things that are often over looked.
Another rule of thumb for me is exhaust first and intake second....
Another rule of thumb for me is exhaust first and intake second....
AMEN, or somebody please!
I have 10lb bottle in my arms and a feed line, and everytime I get ready to grab a wrench to connect it, a new thread pops up and contradicts what I have learned so far...Anyone... :hello:
super diesel
<<<< Under Pressure
I did Pat. Back in the beginning.
Realy? The more I sprayed the higher and quicker they sky rocketed (and this was done on a Dmax motor). Be very careful of using this info. This is what blows intake systems apart and does internal damages from a back fire. A few of us have witnessed this on Dmaxes.
The higher the EGTs, the softer the aluminum gets (closer to melting). Now add pressure and lots of it.
Last edited:
so you are saying GM makes pistons from a fuel, aluminum.
Or I just don't get what you are saying. I believe that there might be chemical reaction/erosion with aluminum, but unsure of the mechanism. If Al+O2=propulsion, I will be surprised.
No just that aluminum can ignite/burn/melt given the right conditions.
Yep
Last edited:
I am just going to assume that these pistons are eroding from molten loss, stemming from sustained high temps. Water can help with this.
If there is something else going on, I don't know what.
I need a kit, time to get busy testing something new.
If there is something else going on, I don't know what.
I need a kit, time to get busy testing something new.