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Topic Review (Newest First)

  • 08-22-2010, 05:51 PM
    Sleeper CP
    Quote Originally Posted by cs19 View Post
    Try a true direct port system and you will never look back.

    Interesting on the autolite strap, Ive always heard it takes some effort to burn a strap off and you usually lose a piston in the process. I used to slip an autolite into a hole once in a while just to compare the readings. I just run NGK now as Im comfortable with the readings.
    Hey Chris,

    I was cleaning out some drawers in the garage today and came across a Champion C59CX recessed plug I tried to run one weekend at the river many moons ago. Killer super duty race plugs the damn things fouled going up river. They kind of glazed over.


    http://www.amazon.com/Champion-296-C.../dp/B000CIS1IS

    We had run them on the dyno in either '98 or 2000 and the worked just fine. I get to the river and I'm headed up river and the boat starts getting lazy as if the timing is retarding and it finally just quites in the middle of the river. WTF we had gone 3-4 miles. I pull out the nasa tool box we carry and start looking for the cause and 4 of the plugs look weird so I change them out to the Autolite 51's I had in the boat. This took abit to get to the plugs being the issue after checkin fuel the dizzy and maybe something else.

    We take off and about 1/2 mile later the it losses power again I check the other 4 plugs and damn they're glazed over too. I throw in 4 more Autolites and away we went. Those damn Champions just didn't like something we were doing, 3,800 rpm cruise or the fuel. /they just checked out. So I've run the Autolite 51's ever since.

    I was a bit surprised that the MSD and the hot coil wasn't enough to keep them firing.

    S CP
  • 08-20-2010, 07:32 AM
    Sleeper CP
    I actually had a mag glass in the boat to look at plugs. I'd pull my two lean cylniders or at least my two problem cylinders to read. After the distribution problem was fixed the problem went away.

    Your fuel psi is important set it to the instructions 6 psi or whatever it is the system is set on the safe side so you can probably drop .5 psi off that and be more than safe.

    Make a "5" count pass and check the plugs. Then make a second one and check the plugs. After that make an 8 or 10 count pass and check again.

    Remember to pay attention to the timing retard while using the Nos.

    S CP
  • 08-20-2010, 05:58 AM
    Widetrack
    Jon and Chris thanks for the info. This was what I was looking for! Now I just need to stepup my game! WT
  • 08-19-2010, 09:21 PM
    cs19
    Quote Originally Posted by Sleeper CP View Post
    I found if we burned an Autolite 51 strap we were ok but if the porclien was touched the piston was done.

    After burning a few pistons I sent the manifold to Top Gun Nos (around '95) and had them put the spray bars in the plenum. No more burned pistons.

    S CP
    Try a true direct port system and you will never look back.

    Interesting on the autolite strap, Ive always heard it takes some effort to burn a strap off and you usually lose a piston in the process. I used to slip an autolite into a hole once in a while just to compare the readings. I just run NGK now as Im comfortable with the readings.
  • 08-19-2010, 09:18 PM
    Sleeper CP
    Quote Originally Posted by gn7 View Post
    WOW! That would never happen with a Chevy. But then, they don't need that much NOS to start with.
    Hey now. That was a 250 or 300 hp shot, but with a screwed distribution.

    S CP
  • 08-19-2010, 09:14 PM
    Sleeper CP
    Quote Originally Posted by cs19 View Post
    I thought you were the guy who uses the Nitrous wizard sorftware and has it all figured out?

    Autolites can be read right away but if you burn a strap you lost a piston where NGK will lose a strap and you likely still have a piston for next round. Run a non projected tip for nitrous and look for the timing mark to be at the bend on the strap.

    .
    I found if we burned an Autolite 51 strap we were ok but if the porclien was touched the piston was done.

    After burning a few pistons I sent the manifold to Top Gun Nos (around '95) and had them put the spray bars in the plenum. No more burned pistons.

    S CP
  • 08-19-2010, 07:01 PM
    cs19
    Found it..

    It had a little peppering going on with the porecelain, thats been resolved. If its rich you can get peppering, could be oil too from things not being sealed up. fuel ring is still considered rich to most serious nitrous people. On a N/A motor I think thats what a fuel ring at 12.5:1 AF would look like though, isnt it?

    timing is hard to see but the reddish color on the strap is the coating burnt off and it stops right at the bend. NGK plug

  • 08-19-2010, 06:55 PM
    cs19
    I thought you were the guy who uses the Nitrous wizard sorftware and has it all figured out?

    NGK or Autolite? Its a toss up which to run, Autolites show a nice rainbow color on the strap and the rainbow makes the timing marks easy to read. Heat up a piece of steel with a torch and it will all make sence if your unfamiliar with that stuff. NGK you kinda go by how it burns the coating off the strap, I like to make a few runs on the NGK to get a real good timing mark, its well defined after a few runs with NGK. Autolites can be read right away but if you burn a strap you lost a piston where NGK will lose a strap and you likely still have a piston for next round. Run a non projected tip for nitrous and look for the timing mark to be at the bend on the strap.

    Look for a small fuel ring waaaay down at the bottom of the porcelian, you will need a plug reading tool if you want to do this right, or cut the threads off with a deathwheel or in a lathe to get a real good look. Some shoot for no fuel ring, yeah that may be a super clean aggresive tuneup that makes killer power but you dont know how lean you are if there is no fuel ring. I like a very small ring down at the bottom so i know where Im at. Ill give up the 5 hp to know where Im at. I ran mine super lean earlier this season and it hauled ass and the plugs looked like new out of the box but Ive since backed it off a little.

    If the fuel ring is halfway up the porcelain dont just take some fuel out without knowing how its doing timing wise, if its on the edge timing wise and you take fuel away you could hurt it. you may need to pull more timing if you are gonna take fuel away.

    Hope that helps. I posted a pic of a nice fuel ring in the jetboat pics thread a long time ago.
  • 08-19-2010, 06:35 PM
    gn7
    Quote Originally Posted by Sleeper CP View Post
    How many rpm does it gain with the 100 shot and how much HP do you think the engine has ?

    If the ground strap is not burned at all you can add more juice, if the porclein is gone you'll need to replace a piston.



    S CP
    WOW! That would never happen with a Chevy. But then, they don't need that much NOS to start with.



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  • 08-19-2010, 05:20 PM
    Sleeper CP
    Quote Originally Posted by Widetrack View Post
    Chris
    No pun intended it makes me giggle!
    Like a spotted assed ape! It picks it up but I think I need more cam to get the best out of it! 100 shot is all I have tryed and it carrys it to 6000 RPM! WT
    How many rpm does it gain with the 100 shot and how much HP do you think the engine has ?

    If the ground strap is not burned at all you can add more juice, if the porclein is gone you'll need to replace a piston.



    S CP
  • 08-19-2010, 01:00 PM
    BigSteve
    Before you get to crazy with Nos make dam sure you can supply the fuel flow at pressure at all times. I'am setting up a rear end right now for a 755 inch motor w/4-300 hp shots total 2600 hp. the manifold was sent to Nos for plumbing and flow testing and the Nos guys came out to tune it. The fuel demands of this engine took quite a fuel system. The Nos boys will tell you this is the #1 problem with set ups. Have fun
  • 08-18-2010, 02:16 PM
    Widetrack
    Thanks Hass! I thought that was what he was saying! WT
  • 08-18-2010, 01:51 PM
    Hass828
    Quote Originally Posted by cstraub View Post
    Years ago a very dominate 10.5" tire racer used NOS to put everyone on the trailer. All I can say is multiple small injestions was much more effective then one big gulp.
    Quote Originally Posted by Widetrack View Post
    Chris, Can you explain further? Im a little slow you know!
    He's talking about trying to hook up on a 10.5 tire, that bringing the nitrous in a little at a time worked well on the car. But one a jet on big hit seems to work best to me
  • 08-18-2010, 12:57 PM
    IMPATIENT 1
    Quote Originally Posted by Widetrack View Post
    Turn, who needs to turn??? LMAO! I am going to bump it to 200 just to see! WT
    yeahhh right, it'll never see less than 200 again if ya do seems like they always begin to pull real nice at 200 and up you aint trying to cut a et bracket here ya know
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