Results 1 to 9 of 9

Thread: hp question

  1. #1
    Member JOURNEYMAN
    Join Date
    Dec 2008
    Location
    jacksonville florida
    Posts
    34

    hp question

    just took car to dyno, not pleased with the numbers
    just looking for some input
    500hp at 5200rpm
    here is the combo

    500 ci mopar
    12.5:1 cr
    700 lift cam prostock roller lifters
    port and polished aluminum heads
    1.5 roller rockers,
    bird catcher with alky
    38 degree timing
    msd 7al2
    the lamda was .7 on both sides
    egt ranges 990-1040 F
    5000 stall converter, JW ultraglide, strange 9" with 4.10 progears
    33x15.5 slicks

    i know it was running rich but power should be much better
    the first time i went to dyno(different one) i made 610hp at 5000rpm before trans issue.(bad pump)
    thanks for the input

  2. #2
    Senior Member RACING JUNKIE curtisreed's Avatar
    Join Date
    Feb 2004
    Location
    KIEFER, OK.
    Posts
    1,309
    The EGT numbers look ok but the Lambda number seems really rich. Here are some numbers I have for conversion from Lambda.

    Lambda alcohol gas

    1.000 6.450 14.700
    0.990 6.386 14.553
    0.980 6.321 14.406
    0.970 6.257 14.259
    0.960 6.192 14.112
    0.950 6.128 13.965
    0.940 6.063 13.818
    0.930 5.999 13.671
    0.920 5.934 13.524
    0.910 5.870 13.377
    0.900 5.805 13.230
    0.890 5.741 13.083
    0.880 5.676 12.936
    0.870 5.612 12.789
    0.860 5.547 12.642
    0.850 5.483 12.495
    0.840 5.418 12.348
    0.830 5.354 12.201
    0.820 5.289 12.054
    0.810 5.225 11.907
    0.800 5.160 11.760
    0.790 5.096 11.613
    0.780 5.031 11.466
    0.770 4.967 11.319
    0.760 4.902 11.172
    0.750 4.838 11.025

  3. #3
    Senior Member RACING JUNKIE
    Join Date
    Jan 2012
    Posts
    628
    Again, not being a wiseass, but . .

    Tire guages aren't the same, one reads one thing, the next may be a half pound different. Same with Dynos . . It's all relative. When you changed Dyno's you started over . .

    Jus' a SWAG here, but take 2 out of it, lean it out two steps and try it again. Dunno what yer air is but I've never seen many 500" alky engines that liked more than 33-34 of lead . . 'Course, I've always dealt with blown alky engines so there may be some difference.

    Take it to the track, as I said in another thread, the race track is the most honest Dyno ever created . .

  4. #4
    Senior Member SENIOR BUILDER
    Join Date
    Dec 2005
    Posts
    117

    listen to Roadkill2

    Quote Originally Posted by roadkill2
    Again, not being a wiseass, but . .

    Tire guages aren't the same, one reads one thing, the next may be a half pound different. Same with Dynos . . It's all relative. When you changed Dyno's you started over . .

    Jus' a SWAG here, but take 2 out of it, lean it out two steps and try it again. Dunno what yer air is but I've never seen many 500" alky engines that liked more than 33-34 of lead . . 'Course, I've always dealt with blown alky engines so there may be some difference.

    Take it to the track, as I said in another thread, the race track is the most honest Dyno ever created . .
    gotta agree again! wow, great advice 8)

    -it sure does sound rich with those readings, as roadkill2 sez, why not lean it out and see if it responds ET wise..
    -also agree on taking a bit of timing away to start with..you can always play with that once you get the fuel closer..

  5. #5
    Member JOURNEYMAN
    Join Date
    Dec 2008
    Location
    jacksonville florida
    Posts
    34
    I think im going to stay from the dyno for awhile.
    Just want a guestimate of what it should make.

  6. #6
    Senior Member SENIOR BUILDER
    Join Date
    Dec 2005
    Posts
    117
    Quote Originally Posted by dartsteve
    I think im going to stay from the dyno for awhile.
    Just want a guestimate of what it should make.
    - do your dyno guys have any real experience? :? real experience with alky?or are you teaching them?

    -why not 1100-1200F on the pyro?

    -why not .8xx on the Lambda?

    -what do the plugs look like? burning any plating off the base?

  7. #7
    Senior Member MASTER BUILDER
    Join Date
    Apr 2003
    Location
    Brookings South Dakota
    Posts
    244
    Your EGT looks really low. How many RPM did you pull it to?

    I also agree 38 degrees seems a bit much, but every motor is different.
    Competition Engines & Hardcore Engine Parts
    www.cnc-motorsports.com
    [email protected]

  8. #8
    Member JOURNEYMAN
    Join Date
    Dec 2008
    Location
    jacksonville florida
    Posts
    34
    6000rpm
    Plugs looked clean

    Headed to track tomorrow night i hope to have pics and slips
    Plan is to do one pass then make some changes.

  9. #9
    Senior Member SENIOR BUILDER
    Join Date
    Dec 2005
    Posts
    117
    Quote Originally Posted by dartsteve
    6000rpm
    Plugs looked clean

    Headed to track tomorrow night i hope to have pics and slips
    Plan is to do one pass then make some changes.
    -set the timing
    -check/set valve lash
    -pull some fuel out slowly....watch your timeslips! :wink:
    -have fun


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Copyright © 2005-2016 RacingJunk.com All Rights Reserved.

Designated trademarks and brands are the property of their respective owners. Use of this Web site constitutes acceptance of the RacingJunk.com
Terms of Use, Classifieds Disclaimer, Privacy Policy, and Cookie Policy