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  1. #1
    Senior Member cbcp's Avatar
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    Default Nos

    What's the maximum compression you can have to run NOS or is all about the timing??
    Last edited by cbcp; 10-14-2008 at 05:16 PM.

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  3. #2
    BTC cardcarrying member sunkisst's Avatar
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    Default Nitrous

    This is a GOOD question,I am looking forward to the responses...I sold my 13:1 motor to a guy that put it in his street car and he wants to spray the shit out of it.LOOKING FOR A RESPONSE OR TWO....OR THREE...Thanks.....

  4. #3
    Senior Member APOLLO's Avatar
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    In your cars, we call it bog be gone.

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    Senior Member Boat 405's Avatar
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    I've heard 14 to 1 is a good number or there abouts and you will need to pull timing out for it to work!

  7. #5
    steelcomp was here
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    I know of a 565 that's going to get at least a 200 shot- prolly more, with 15:1. We'll see how that goes. Dry system with an EFI injection system.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  8. #6
    B1 Racing cs19's Avatar
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    Dont sweat the compression ratio too much, just focus on having a good tune up in it and having the right parts, do some research before you run it, dont rush the install.

    For a full tilt nitrous dedicated engine the popular compression ratios are about 13.5-14.0 but there are guys doing it with 15.5 and more.
    B1Racing.net

  9. #7
    mo balls than $cents$ IMPATIENT 1's Avatar
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    13.5 to 505 and race on 300-400hp 2stage, have a msd 3stage retard handling the timing, i'm locked at 36 total.

  10. #8
    Distinguished Member David 519's Avatar
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    I've been looking at this whole subject a lot lately. Our next motor will likely end up with as a nitrous specific build (unless I can't live without a blown alcohol deal after this weekend!!). There's a bunch of guys around that know a lot more about this than I do. Chris certainly has his chit together on the whole nitrous deal.
    Gene Fulton reportedly just built a big inch (800+) nitrous specific motor with nearly 18:1... Mear mortals need not apply. A couple of the nitrous guru's suggest around 13:1 as a good CR with the most forgiving tune up window for a mild shot (less than 250hp or so). Above that CR, the timing and nitrous tune up window starts to get narrower.

  11. #9
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by David 519 View Post
    I've been looking at this whole subject a lot lately. Our next motor will likely end up with as a nitrous specific build (unless I can't live without a blown alcohol deal after this weekend!!). There's a bunch of guys around that know a lot more about this than I do. Chris certainly has his chit together on the whole nitrous deal.
    Gene Fulton reportedly just built a big inch (800+) nitrous specific motor with nearly 18:1... Mear mortals need not apply. A couple of the nitrous guru's suggest around 13:1 as a good CR with the most forgiving tune up window for a mild shot (less than 250hp or so). Above that CR, the timing and nitrous tune up window starts to get narrower.
    same thing i herd bout 13-13.5 to 1 being the sweetest spot for motors that'll still see run time other than race. i built mine at 13.5 to 1 thinking i had a hookup on ethanol local, that deal dried up and i got left runnin $$$ gas all this past summer even at 13.5 to 1 , tuning took a bit and i had the plate off countless times flowing it till i found the sweet spot with nitrous a/f. what the manufacture recommended left me runnin pretty fat, and i ended up at 8 psi flowing to get a nice lean safe plug reading.would imagine a 15 to 1 or higher motor would be alot header to tune on the bottle to get on that ragged edge

  12. #10
    Owner/Crew Chief 1/4 Miler's Avatar
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    At the amount you guys are talking about, say a 350 shot, 13:1, 15:1 isn't that important so long as you pay attention to tuning details .......

    When you get really serious about injecting a lot of n2o ... say, above 350 (mild, but, you need to watch as you put in more) and get to the 500, 1,200, 1,500 + range, then there's considerable more than compression ratio that needs to be designed ... Heck, check with Starkweather about a 1,000+ Shot and how a motor should be built to Endure more that a run or two passes ... I'm sure he'll give he can clue in ... afterall, he's now apparently the SoKal Motor Builder to ask about these things according to all the bullshit I see on this Fourm.
    Last edited by 1/4 Miler; 10-15-2008 at 06:28 PM.

  13. #11
    Senior Member OkieDave's Avatar
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    Default fuel delivery

    as long as you have adequate fuel delivery, compression is not a problem. nos quells detonation. go for as much compression as you can get.

  14. #12
    Resident Ford Nut Sleeper CP's Avatar
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    Quote Originally Posted by David 519 View Post
    A couple of the nitrous guru's suggest around 13:1 as a good CR with the most forgiving tune up window for a mild shot (less than 250hp or so). Above that CR, the timing and nitrous tune up window starts to get narrower.

    It was stated by other's but this is great info, the higher the compression the less forgiving your window for error is. Everything else becomes all the more critical, just less room for error. 12.1-13.5 is about all you need, on a 800hp engine the difference between 12:1 (800 hp) and 13.1 would be about 32 hp all else being equal but your window for mistakes on Nos just got smaller.

    Sleeper CP

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  15. #13
    B1 Racing cs19's Avatar
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    Quote Originally Posted by 1/4 Miler View Post
    At the amount you guys are talking about, say a 350 shot, 13:1, 15:1 isn't that important so long as you pay attention to tuning details .......

    When you get really serious about injecting a lot of n2o ... say, above 350 (mild, but, you need to watch as you put in more) and get to the 500, 1,200, 1,500 + range, then there's considerable more than compression ratio that needs to be designed ... Heck, check with Starkweather about a 1,000+ Shot and how a motor should be built to Endure more that a run or two passes ... I'm sure he'll give he can clue in ... afterall, he's now apparently the SoKal Motor Builder to ask about these things according to all the bullshit I see on this Fourm.
    WTF is this Jak. Another chicken shit comment from the guy who has not raced all year?

    I'm not any kind of an engine builder, never claimed to be one. I help certain people where I can and that I think are cool and good for the sport, some more than others. I have had ALOT of help along the way also, I always thank these people and always attempt to return the favor, always! I try to figure things out myself first, when I'm stumped I make a call or get online to an engine or nitrous forum and try to weed through all the BS for some good info. Thats how I work, my goal has been to depend on the least amount of people as possible and so far Im pretty much a one man deal with a few exceptions, made some good contacts that we dont abuse along the way.

    As far as putting nitrous to a motor...Honestly, what you have you done other than sit there and watch someone else do your tune up for you? I started "scared to death" at 175 because of the 12 degree tune up thing and have since worked my way up into much bigger systems than you have run in Mrs. Money Penny and thats a fact. I was standing right there when you finally got the OK to run more nitrous last year and it WAS NOT you dropping the pills in and setting up the fogger, I watched the whole process. I will give you credit for tuning the hardware yourself and doing your keels etc. etc.. You deserve that but you dont setup your nitrous yourself so dont comment on what I'm doing. I ran 3 different nitrous tune ups at the June event to run the number finally ran .02 and never hurt a thing. That was more tune up changes than you made since your boat was put togethor Ill bet. I have not missed a race this year and every single pass was on the bottle while you were not racing so settle down on the cheap shots. Also took it to the river all season and there was a bottle in there every day it hit the water and it got used. Ask anyone on here if you dont believe me.

    I agree with what your saying about huge nitrous and the tuning window but nobody in jetboats other than that critical mass guy on YB is running that kind of a load of nitrous in a jetboat.

    Why dont you just put YOUR favorite tuneup in that thing and come to Ming this weekend. Id love to have a shot at the BLACK MAMBA. I really do try to stay out of internet drama these days but Ive been following all your little "mickey Mouse" jabs at me over the past few months and Ive had enough. You obviously have a new found issue with me and to be honest i dont care. If this is coming from Sampica that bums me out, I will say that.

    Chris
    B1Racing.net

  16. #14
    Senior Member ULTRA 23's Avatar
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    CS19 this guy is just bitter because we are all running better than he ever did with alot less power. Great idea bring the Black Mamby to the track and show us all how to do it. Bottoms up
    John D

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