F/I Blowing motors facts

[mrk1]

Yes when I wrote 33% i was referring to volume sorry I didnt specify, by weight its 36%

To cite my source, Nitrous Oxide High-Performance Manual by Trevor Langfield. Trevor owns the UK based Wizard of NOS company.

[go_a_way1]

BRB getting more popcorn

[Toyarzee]

Originally Posted by go_a_way1

BRB getting more popcorn

Only if you bring enough to share with the rest of class

[go_a_way1]

Originally Posted by Toyarzee

Only if you bring enough to share with the rest of class

Don't worry I got lots

[Matt@Cosworth]

Originally Posted by CSG Mike

Pretty much.

I'm at the dyno and flashing takes forever. I wish EcuTek had live tuning

Perhaps we can get a free Motec like all the other free parts on the car /sarcasm

you can get a kind of live tuning with ecutek
if you use a 0.5 to 4.5V power supply and feed it into the rear O2 sensor plug and then assign a custom map to apply an offset to the parameter you want say spark timing with 0.5V its -10 degrees and 4.5V its + 10 degrees fro example then its case of turning the power supply up and down to offset your spark
and then use the mode switch to assign other parameters to your rear o2 so you can use it to map cam timign, gdi timing etc

[FRS Justin]

Originally Posted by shiumai

the atoms are not the same atomic weight. oxygen is 16, and nitrogen is 14.007. if you take 14.007+14.007+16 = 44.014. then take 16/44.014, you get .364, which is 36.4%.

Interesting and very plausible. I assume its a liquid state at this percentage I don't know. The reason I ask is other sources such as NX Express and even good old Wikipedia have it at 33%. Not arguing I sincerely don't know this answer.




Edit:
The weight of the molecules will change according to temperature and state of molecules. (Gas vs Liquid)
Source Purdue University chemistry dept.

[shiumai]

Originally Posted by FRS Justin

Interesting and very plausible. I assume its a liquid state at this percentage I don't know. The reason I ask is other sources such as NX Express and even good old Wikipedia have it at 33%. Not arguing I sincerely don't know this answer.

Here's a link i found - by weight:
http://www.noswizard.com/nos-technic..._nitrous_oxide

[CSG Mike]

Originally Posted by FRS Justin

Interesting and very plausible. I assume its a liquid state at this percentage I don't know. The reason I ask is other sources such as NX Express and even good old Wikipedia have it at 33%. Not arguing I sincerely don't know this answer.

Chemical state does not change composition.

Nitrous itself is 33% oxygen by molarity, or 36% oxygen by mass.

Thing is, you can't displace all atmospheric air with N2O.

[Freeman]

If nothing else I'm learning a shit ton about nitrous

[go_a_way1]

Originally Posted by Freeman

If nothing else I'm learning a shit ton about nitrous

Originally Posted by new2subaru

For sure! I don't mind threads that go off track.

+1 to that and that!

[FRS Justin]

Originally Posted by CSG Mike

Chemical state does not change composition.

Nitrous itself is 33% oxygen by molarity, or 36% oxygen by mass.

Thing is, you can't displace all atmospheric air with N2O.

I agree 100% but whatever is replaced will have a higher o2 content and still raise the cylinder charge o2 percentage in the given volume.

[totopo]

Originally Posted by CSG Mike

Chemical state does not change composition.

Nitrous itself is 33% oxygen by molarity, or 36% oxygen by mass.

Thing is, you can't displace all atmospheric air with N2O.

On further retrospect... molarity is what is important, not weight, since it is a gas. Furthermore N20 disassociates in the cylinder (it requires high T), not the manifold.

So let's say you ran on 1 atm of pressure of PURE NOSS!!!!Z!!11! (/s). In effect, since each mole of N20 dissociates into half a mole of 02, that would equate to 50% atm partial pressure of 02.

So depending on your mixture of air vs N20 it would be somewhere between 20 and 50% effective 02.

edit (because math is fun!!!): 100% N2O would be 7.35 PSI of O2. To get that much with FI, given 20% of O2 in air you would need 2.5 atm worth of air, so an extra 1.5 atm of boost, which equals 22 PSI of boost!!!! just from the oxygen alone!

[FRS Justin]

Originally Posted by totopo

On further retrospect... molarity is what is important, not weight, since it is a gas. Furthermore N20 disassociates in the cylinder (it requires high T), not the manifold.

So let's say you ran on 1 atm of pressure of PURE NOSS!!!!Z!!11! (/s). In effect, since each mole of N20 dissociates into half a mole of 02, that would equate to 50% atm partial pressure of 02.

So depending on your mixture of air vs N20 it would be somewhere between 20 and 50% effective 02.

edit (because math is fun!!!): 100% N2O would be 7.35 PSI of O2. To get that much with FI, given 20% of O2 in air you would need 2.5 atm worth of air, so an extra 1.5 atm of boost, which equals 22 PSI of boost!!!! just from the oxygen alone!

Very nice now lets talk about a wet shot of nitrous using E85 on a 4 cyl direct port system @55psi using jets 20 fuel and 41 N2o

[AJPG]

Originally Posted by CSG Mike

I should also add, while we're at it, that I've personally witnessed bent/broken rods on 100% NA, 100% stock engines.

Does that mean stock engines also need rods?

Correlation does not mean causation.

Water?