dyno numbers 425 stroked nailhead

Discussion in ''Da Nailhead' started by gsgtx, Jun 2, 2013.

  1. telriv

    telriv Well-Known Member

    5800 RPM's is where ALL "Nails" fall off because of the lack of air. It just runs out of AIR!!!!!
     
  2. gsgtx

    gsgtx Silver Level contributor

    Tom, what do you think of the air fuel ratio it was 13.4 at peak tq and was in the 13s from 3200 rpms to 4500 rpms. way too lean or a little lean ? . then low 12s after 5000 rpms.
     
  3. telriv

    telriv Well-Known Member

    They say "Lean is mean" Joe. 13.4 is a little lean. What carbs. are you using??? WOT should be in the area of 12.4-12.8. Of course many other factors come into play like idle air bleeds etc. Of course it will usually make the most HP & torque with a slightly lean mix but at the cost of possible detonation. I'd of course like to error on the rich side rather than lean.
    Just my thoughts.


    Tom T.
     
  4. doc

    doc Well-Known Member

    I agree with Tom,,,, a carb/carbs set up will,, will,,, lean out at higher rpm.... so you got to strike a kind of ''middle of the road approach''...... better to go slightly rich on the bottom side.....and to be just right on the top side.....:Brow:

    But,,, and everybody has one,,,:laugh: running on the dyno is going to be different from running on the strip with all of its variables....
     
  5. gsgtx

    gsgtx Silver Level contributor

    two 600 edelbrocks rear jets are 89. I will to 92 jets. doc after 4500 rpms it went 12.9 then after 5000 rpms was low 12s
     
  6. 66gsconv

    66gsconv nailhead apprentice

    Way to go Joe. Glad your picking up a few more hp. When andy gets the graph up it should be cool to see.
     
  7. gsgtx

    gsgtx Silver Level contributor

    going to peak engine horsepower it made 430.75, 5hp over the last time of 425 hp. to make more hp I need a bigger cam. just don't want to do it, runs so nice and smooth for the street. you never know I might get the bug, lol
     
  8. 300sbb_overkill

    300sbb_overkill WWG1WGA. MAGA

    Thems some SWEET Nail Head numbers Joe!:TU:

    What did the max torque monster number end up being?


    Derek
     
  9. 66gsconv

    66gsconv nailhead apprentice

    Thats a good street cam you are running. 230/236 is not to big for 446 cubes. Fast ramp seems to work good and holds on to the power for the little air its getting. I think You are right, if you want more hp you need a little bigger cam. The 2x4 must of helped because it just needs more air for them cubes. I had a factory stock 401 and ran a 650 and 750 with the eelco and the nh 400 cam and it likeed that. Bigger cubes would to i think
     
  10. gsgtx

    gsgtx Silver Level contributor

    thanks a lot. engine tq comes out to 532 tq, same as the single 4, had 550 peak tq on a different run with shorter tires, but have better average numbers for hp and tq with all the changes. Bob, 230-235 you gave me a extra * on the exhaust lol. solid liffters on a tight 109 LSA seems to like it.
     
  11. 300sbb_overkill

    300sbb_overkill WWG1WGA. MAGA

    Wow Joe,are those rear wheel numbers you posted? Either way that is some impressive torque!


    Derek
     
  12. gsgtx

    gsgtx Silver Level contributor

    I wish, no there engine numbers. I used I think a conservative 18% power loss. rear wheel is 353 hp and 436 tq, this a mild street motor with a nice idle and 3.23 gears. and a little 1.5 inch exhaust valve. lol
     
  13. 66gsconv

    66gsconv nailhead apprentice

    I gotta say i didnt expect tq to stay up with 2x4. Eelco is a good intake. When you told me 2 speed and 323 gears and the car will go side ways from a 40 mph punch i was impressed. With a nice idle and reliable. Great street car
     
  14. CameoInvicta

    CameoInvicta Well-Known Member

  15. 66gsconv

    66gsconv nailhead apprentice

    Hi Joe. Just seen the graph. You have to love that the TQ doesn't really fall off till the peak HP. Really looks like a strong street car. :TU:
     
  16. gsgtx

    gsgtx Silver Level contributor

    it feels stronger then ever.
     

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