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Thread: Does NOS Raise Your Compression
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01-23-2008, 06:30 PM #1
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Artic White- 1999 Z28 408 Stroker M6
Does NOS Raise Your Compression
K, well here is my question, I have a buddy that works for a hot rod speed shop, and I have another buddy who is a huge car enthusiast. The guy who works for the speed shop says that Nitrous raises your compression? If so how much does NOS raise your compression on a 11.1 compression vehicle. The car enthusiast says NOS is a chemical break down and does not raise your compression. The are both good friends and I didn't want to argue so I post the question to you. Does NOS raise your compression...? thanks for your time,
Matt
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01-24-2008, 05:07 AM #2
No, it raises cylinder pressure, but compression (static compression) is the result of the ratio of volume between BDC and TDC for a moving piston.
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01-24-2008, 05:08 AM #3
I kinda want to know this two. I would think both your friends are right in one way or another.
Sweet thanks for the info Frost.
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01-24-2008, 08:59 AM #4
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01-24-2008, 09:22 AM #5
Not unless it changes your piston's face, bore, or combustion chamber volume at the same time
SCR is a fixed number based on what I posted above. It *WILL* change your cylinder pressure though.
Better pull some timing with that kinda CR; good gas wouldn't hurt either.
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01-24-2008, 09:45 AM #6
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01-24-2008, 09:48 AM #7
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01-24-2008, 09:51 AM #8
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01-24-2008, 10:07 AM #9
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Artic White- 1999 Z28 408 Stroker M6
but wouldn't more material (nos and gas) mean more to combust?
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01-24-2008, 10:12 AM #10
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01-24-2008, 10:16 AM #11
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01-24-2008, 10:21 AM #12
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Blue- 2002 Z28 Camaro M6
Well your compression ratio will not change. As for safe I am not sure. That depends on a few other things. Partially I don't know how you are set up or tuned, and I am sure there are much better experts out there on NOS then me. Personally I would think if you get all the stuff you need, including a tune etc and you have a nice strong bottom end then you should be fine.
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01-24-2008, 11:49 AM #13
The only thing determining what you can spray is the tuning on your car (to an extent). Need good AFR on the jug and solid timing that yields no knock
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01-25-2008, 06:23 PM #14
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Silver- 2000 Camaro SS
NOS is a namebrand or ricer terminology. N2O is the correct abbreviation for Nitrous Oxide. N2O iscreases the amount of O2 in the cylinder raising the fuel requirements. When you use N2O you need to add more fuel and reduce timing.
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01-26-2008, 12:04 AM #15
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01-26-2008, 05:00 AM #16
i run 11.3:1 SCR and a 250 shot on my 408. nitrous likes compression.
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01-26-2008, 08:06 AM #17
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Artic White- 1999 Z28 408 Stroker M6
tight man thanks, what octane gas do you run?
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01-26-2008, 09:46 PM #18
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01-27-2008, 06:32 AM #19
Sure.... for sparaying 200 or more, you will want a standalone fuel system, and most put good gas in there, since it takes so little. Though at 150-175 with tuning there is no issue on pump gas. Prolly not at higher levels either, just nice to have that extra insurance
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01-27-2008, 09:39 AM #20
Yes it ONLY adds cylinder pressure. By adding a vast amount of cylinder pressure the cylinder thinks it has high compression due to the add. But it doesn't change the motors compression.
A lot of it depends on the camshaft also. Cams that have big overlap tend to bleed off alot of cylinder pressure at low rpm. That is how alot of people trick the motor by having alot of over lap bleeding off that pressure you can get away with running pump gas on a high compression motor.
How much bottle do you plan on spraying? Also it says your stroked in your info so what cam,head gaskets, and pistons are you running.
91 COULD be OK there are many variables that we can't take into fact with your general type ?.
Also what plug are you running with what gap?Don't be afraid of the bottle!!! Be afraid of your tune!!!
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