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Does NOS Raise Your Compression

This is a discussion on Does NOS Raise Your Compression within the Nitrous forums, part of the LSx Technical Help Section category; K, well here is my question, I have a buddy that works for a hot rod speed shop, and I ...

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    I Like It Stroked 99Ls1fever's Avatar
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    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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    TunedbyFrost.com Tuner Frost's Avatar
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    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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    Member transam98's Avatar
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    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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    I Like It Stroked 99Ls1fever's Avatar
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    Quote Originally Posted by Frost View Post
    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.
    so just making sure it will not raise my 11.1 compression when i spray...?

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    TunedbyFrost.com Tuner Frost's Avatar
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    Quote Originally Posted by 99Ls1fever View Post
    so just making sure it will not raise my 11.1 compression when i spray...?
    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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    I Like It Stroked 99Ls1fever's Avatar
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    Quote Originally Posted by Frost View Post
    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.
    in Colorado we only have 91 octane pump gas... this is why i was curious. but isn't cylinder pressure, compression?

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    Senior Member Bottesini's Avatar
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    Quote Originally Posted by 99Ls1fever View Post
    in Colorado we only have 91 octane pump gas... this is why i was curious. but isn't cylinder pressure, compression?

    As I understand it basically cylinder pressure is how much pressure is placed on the cylinder walls from the explosion. Comp ratio is how much the material in the cylinder is compressed before the explosion.

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    I Like It Stroked 99Ls1fever's Avatar
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    Quote Originally Posted by Bottesini View Post
    As I understand it basically cylinder pressure is how much pressure is placed on the cylinder walls from the explosion. Comp ratio is how much the material in the cylinder is compressed before the explosion.
    yea that does sound correct to me too. But i just dont want to blow up a $8k dollar engine either... So i am just being safe... But I will be fine then and the compression will be the same, and the only worry is the cylinder wall strength...? correct?

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    I Like It Stroked 99Ls1fever's Avatar
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    but wouldn't more material (nos and gas) mean more to combust?

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    Senior Member Bottesini's Avatar
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    Quote Originally Posted by 99Ls1fever View Post
    but wouldn't more material (nos and gas) mean more to combust?
    It is still the same size of volume that you are compressing, though the density of what you are compressing changes, since there is essentially more fuel, but the size of the combustion area is still X.

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    I Like It Stroked 99Ls1fever's Avatar
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    Quote Originally Posted by Bottesini View Post
    It is still the same size of volume that you are compressing, though the density of what you are compressing changes, since there is essentially more fuel, but the size of the combustion area is still X.
    thats awesome man, so i can spray and not have to worry about my compression going up and it will be safe on the motor....?

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    Senior Member Bottesini's Avatar
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    Quote Originally Posted by 99Ls1fever View Post
    thats awesome man, so i can spray and not have to worry about my compression going up and it will be safe on the motor....?
    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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    TunedbyFrost.com Tuner Frost's Avatar
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    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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    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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    I Like It Stroked 99Ls1fever's Avatar
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    Quote Originally Posted by 02blkws6 View Post
    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.
    ok well i call it nos so get over it....

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    Senior Member mrr23's Avatar
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    i run 11.3:1 SCR and a 250 shot on my 408. nitrous likes compression.

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    I Like It Stroked 99Ls1fever's Avatar
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    tight man thanks, what octane gas do you run?

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    I Like It Stroked 99Ls1fever's Avatar
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    Quote Originally Posted by Frost View Post
    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
    Do you think running 91 octane gas would be fine for running NOS?

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    TunedbyFrost.com Tuner Frost's Avatar
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    Quote Originally Posted by 99Ls1fever View Post
    Do you think running 91 octane gas would be fine for running NOS?
    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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    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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