Another stupid nitrous question(fuel pump Q?) - Reply to Topic

Reply to Thread

Post a reply to the thread: Another stupid nitrous question(fuel pump Q?)

Your Message

 

Send Trackbacks to (Separate multiple URLs with spaces)

You may choose an icon for your message from this list

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Please select your insurance company (Optional)

Log-in

Additional Options

  • Will turn www.example.com into [URL]http://www.example.com[/URL].

Topic Review (Newest First)

  • 08-17-2009, 06:15 AM
    Hass828
    Quote Originally Posted by H20MOFO View Post
    I appreciate everyone's input, I think the clay smith will flow as much as a holly red(even split in half). The advantage I can see to running a separate pump, is you could draw off another tank, say with some 110 octaine for the enrichment, and maybe not have mess with the timing as much??? At 6300 ft. my boat would only turn 48-4900 r's at 35*, at 42* ish I got 53-5400. I'm gonna run it down here(about 4200 ft.) with the timing set at 42* and see if she goes or blows.
    Man, if your running that much timing, I'd suspect that your pointer is off a little. You may be getting away with it because of the low comp. but when you throw the nos at it you'll almost certainly need to kill a little timing. Maybe not as much as you hear other people say but with that engine I would suspect (just from my own experience so take it for what you will) that you will start seeing signs of detonation with anything more than 31degrees. I'd start off at 29 and slowly creep up to 31 and keep an eye on the plugs and the rpms, if the rpms drop off back the timing back up, if you make 31 and everything is fine I'd call it a day. just my .02
  • 08-17-2009, 02:10 AM
    WINspeed
    Start low on the timing 26ish and work your way up 2deg at a time checking the plugs as you go. You'll probably end up between 28-32 depending on your combo. Run good gas too. IMO.

    10,000 rpm makes awesome kits. IMO they work better than most other brands that use jets. Each plate is flowed and tuned with fuel PSI for different HP levels.
  • 08-11-2009, 06:24 PM
    IMPATIENT 1
    Quote Originally Posted by H20MOFO View Post
    I appreciate everyone's input, I think the clay smith will flow as much as a holly red(even split in half). The advantage I can see to running a separate pump, is you could draw off another tank, say with some 110 octaine for the enrichment, and maybe not have mess with the timing as much??? At 6300 ft. my boat would only turn 48-4900 r's at 35*, at 42* ish I got 53-5400. I'm gonna run it down here(about 4200 ft.) with the timing set at 42* and see if she goes or blows.
    man that's alot of timing at those altitudes! detonation will happen sooner up in the clouds like that. on a 200hp shot, start out around 29-30* of timing total on nitrous.
  • 08-11-2009, 06:20 PM
    H20MOFO
    Quote Originally Posted by flat screwd View Post
    The problem I have found with using the jug on a daily drivers is that the tune needs to change along with the HP requirements premium pump gas will only get you to a 150 shot safely any thing bigger than that and you will need a spark retard system or a dedicated fuel source with a higher octane rating.
    I appreciate everyone's input, I think the clay smith will flow as much as a holly red(even split in half). The advantage I can see to running a separate pump, is you could draw off another tank, say with some 110 octaine for the enrichment, and maybe not have mess with the timing as much??? At 6300 ft. my boat would only turn 48-4900 r's at 35*, at 42* ish I got 53-5400. I'm gonna run it down here(about 4200 ft.) with the timing set at 42* and see if she goes or blows.
  • 08-11-2009, 05:56 PM
    IMPATIENT 1
    look on ebay and type in "holley red pump". it'll bring up the holleys of course but it'll also bring up the procomp version of the holley pump for 45bucks. buy 1 of those and adjust the spring in it till you hit your plate flow pressure goal and you won't have to run a regulator. regulators slow fuel volume(unless its bypass style). if you have dual tanks, just tee 1 of the tanks so you can pull the fuel for nitrous from it, while the motor is pulling from the other tank.

    fyi, i ran 2 of those procomp "holley" black pumps on my gullwing. i fed the motor with 1, and the 450hp 2stage of nitrous with another 1 on a bypass regulator. they never failed me, i've bought 4-5 of those procomp electric pumps, its the same pump as the holley(even uses holley rebuild kits). i don't like recommending chinese shit, but most of the fellas on ebay are american and the profit goes in their pocket. doesn't make it right, but at least an american made more than a chinamen on the deal
  • 08-11-2009, 05:41 PM
    flat screwd
    The problem I have found with using the jug on a daily drivers is that the tune needs to change along with the HP requirements premium pump gas will only get you to a 150 shot safely any thing bigger than that and you will need a spark retard system or a dedicated fuel source with a higher octane rating.
  • 08-11-2009, 08:55 AM
    hotbo
    Quote Originally Posted by Sleeper CP View Post
    As said by the the "good ol boy's" those Clay Smith fuel pumps move some fuel. I know a guy who ran a 250 shot off one on a built 468 with a tunnel ram and two 750's, that engine screamed. It was the large(Smith Mechanical) pump and he ran a 1/2" pipe out of the pump with a Tee to a Holley regulator for the Nos system.

    If you ever get a chance hook your Nos system up with an electric pump. You'd be surprised as to how little fuel is used at 6psi through the Nos fuel jet. Just make sure you run over-size fuel lines for the fuel system if using the same pump for the engine and the Nos. It helps a lot.

    Just my .02

    S CP
    i ran holley blue(110gph) for years and ran 150-200 shot all the time,threw a holley cheapo reg.ran just fine never any problems.

    i know run a mech.110gph pump and no problems.plumbed the same way.except done away with the reg.runs just as good if not better.
    the mech.pump is pre-set to put out no more than 7psi.when i push the button on a 150shot the pressure stays at 5.5psi.were i like it.
  • 08-11-2009, 08:53 AM
    motormonkey
    Well, use that pump than. I wonder what the surge pressure #'s would be and the dead head on that system would be like? I thought he wanted to drive around all day and hit it every once in a while.
    Im wrong then.
  • 08-11-2009, 08:07 AM
    Sleeper CP
    Quote Originally Posted by hotbo View Post
    your clay smith pump(if its the 140gph)like hass said atleast 110gph, will handle all the fuel flow needed for a 200 shot.

    again there is no vodoo when using nos,all the naysayers are scared or to ignorant to have figured it out.
    As said by the the "good ol boy's" those Clay Smith fuel pumps move some fuel. I know a guy who ran a 250 shot off one on a built 468 with a tunnel ram and two 750's, that engine screamed. It was the large(Smith Mechanical) pump and he ran a 1/2" pipe out of the pump with a Tee to a Holley regulator for the Nos system.

    If you ever get a chance hook your Nos system up with an electric pump. You'd be surprised as to how little fuel is used at 6psi through the Nos fuel jet. Just make sure you run over-size fuel lines for the fuel system if using the same pump for the engine and the Nos. It helps a lot.

    Just my .02

    S CP
  • 08-11-2009, 05:41 AM
    hotbo
    your clay smith pump(if its the 140gph)like hass said atleast 110gph, will handle all the fuel flow needed for a 200 shot.

    again there is no vodoo when using nos,all the naysayers are scared or to ignorant to have figured it out.

    if you were going to go really big then thats when you need to start thinking about,another pump,added regulators,big learning curve,ect.

    i like the nx express hitman kits,100-200 shots.they work great,but in reality just about any of the kits will work great.

    they all require different fuel pressures.

    motormonkey is wrong wrong wrong on the fuel pump.200 is not small but is by no means big.good luck and sounds like you are ready to have fun
  • 08-11-2009, 05:31 AM
    Hass828
    Quote Originally Posted by H20MOFO View Post
    Thanks for the help guys. FWIW I think I have a decent nitrous motor on accident. My quench is .065(on accident) and my compression is 8.5 to 1 (on purpose). I went with a low CR thinking I could afford forced induction, but that ain't happening soon. Long story short my 557 will run about 72 mph at 4300 ft with the timing set at 37*, at 6500 ish and 42* I just ran 75mph. Am I delirious to think I can run 35* total and a 200 shot??? I'm not overly worried about the bottom end(famous last words)lol, ring gap is .027.
    Thats a large engine to be running that much timing on, usually you'll see an engine of that displacement making its best power with 28-30 degrees of timing, but there are alot of variables that may be causing you to run so much, like the large quench and low comp, cylinder heads come into place as well as cam and a whole other host of items, if it were me I'd run 30 degrees locked and let it eat. 35= to much IMO, My .02

    Oh Yea, and you better run at least 110 fuel while on the squeeze.
  • 08-10-2009, 09:53 PM
    Jetaholic
    Quote Originally Posted by H20MOFO View Post
    My bad...6500ish is the altitude I ran 75 mph with 42* adv. I'm about to put together a tighter pump with a detailed bronze b cut agressor(sp?) Right now I have to spin a ab cut to 5300-5400 to hit 75 mph.
    OK that definitely sounds more plausible
  • 08-10-2009, 09:33 PM
    H20MOFO
    My bad...6500ish is the altitude I ran 75 mph with 42* adv. I'm about to put together a tighter pump with a detailed bronze b cut agressor(sp?) Right now I have to spin a ab cut to 5300-5400 to hit 75 mph.
  • 08-10-2009, 09:28 PM
    Jetaholic
    Quote Originally Posted by H20MOFO View Post
    Thanks for the help guys. FWIW I think I have a decent nitrous motor on accident. My quench is .065(on accident) and my compression is 8.5 to 1 (on purpose). I went with a low CR thinking I could afford forced induction, but that ain't happening soon. Long story short my 557 will run about 72 mph at 4300 ft with the timing set at 37*, at 6500 ish and 42* I just ran 75mph. Am I delirious to think I can run 35* total and a 200 shot??? I'm not overly worried about the bottom end(famous last words)lol, ring gap is .027.
    Craig, how heavy is your boat? Just curious as to why you have to spin nearly 1200 RPM more to go the same speed as I do (wondering if it's possible that your tach could be off). Also, what impeller are you running that will allow an 8.5:1 motor to spin it to 6500?
This thread has more than 14 replies. Click here to review the whole thread.

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •  
 

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95