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Projects Y BLOCK DYNO DAY

Discussion in 'Traditional Hot Rods' started by Mummert, Aug 12, 2014.

  1. Mummert
    Joined: Jun 3, 2012
    Posts: 119

    Mummert
    Member

    We took the new 331 cu. in. Y block up to the dyno last Tuesday. It was fun and stressful at the same time. Typical dyno day. We played with a few things trying to get it ready to stuff into the 64' Falcon. dyno2lowres.JPG dyno1lowres.JPG
     
  2. This is making me want to throw the 302 that I'm swapping in my '56 into the garbage. Numbers?
     
  3. squirrel
    Joined: Sep 23, 2004
    Posts: 47,170

    squirrel
    Member

    cool beans! A wideband on each cylinder....playing with different intakes...should be a lot learned, right there
     
    65COMET likes this.
  4. BadgeZ28
    Joined: Oct 28, 2009
    Posts: 1,076

    BadgeZ28
    Member
    from Oregon

    Don't leave us hanging. What did it make? HP/torque?
     

  5. Mummert
    Joined: Jun 3, 2012
    Posts: 119

    Mummert
    Member

    Best pull with the dual plain ported manifold 513hp@7100 425tq @5200

    Best pull with the single plain 532hp@7000 438tq @ 5400
     
    -Brent-, turboroadster, Keep and 10 others like this.
  6. YeeHa!
     
    65COMET likes this.
  7. fab32
    Joined: May 14, 2002
    Posts: 13,985

    fab32
    Member Emeritus

    Fantastic numbers for an "obsolete" old war horse. Anything under 3,000 pounds I suggest taking a change of underware with you for the first trip to the drag strip.

    Frank
     
    kidcampbell71 and slammed like this.
  8. bchctybob
    Joined: Sep 18, 2011
    Posts: 2,652

    bchctybob
    ALLIANCE MEMBER

    Now that's awesome. Any more pics of that fabricated single plane manifold? That's nice work!
     
    65COMET likes this.
  9. ynottayblock
    Joined: Dec 23, 2005
    Posts: 1,954

    ynottayblock
    Member

    500+ hp...thats impressive. Can we get some specs on the build and parts used?
     
  10. Mike VV
    Joined: Sep 28, 2010
    Posts: 2,132

    Mike VV
    Member
    from SoCal

    Mum -

    Nicely done.

    Mike
     
  11. Mummert
    Joined: Jun 3, 2012
    Posts: 119

    Mummert
    Member

    1.7 rockers.jpg View attachment 2688724
    1.7 rocker pics

    331ci
    3.84 bore
    3.57 stroke
    13.0 compression
    1.7 rockers
    254 duration .600 lift
    MSD distributor
    Ported Mummert Aluminum heads

    Should be real nice bracket motor. Sounds sweet.
     
    Last edited: Aug 14, 2014
  12. rottenleonard
    Joined: Nov 7, 2008
    Posts: 1,970

    rottenleonard
    Member

    Turning a Y block 7k is impressive enough, the numbers are just showing off. Thums up! Btw that manifold looks killer.
     
    dana barlow and loudbang like this.
  13. I really like how you came up with that manifold design which is Y block specific. My hat is off to you.
    don
     
  14. jerry
    Joined: Mar 2, 2001
    Posts: 3,474

    jerry
    Member

    WOW! What a set of numbers!


    jerry
     
  15. Weird A
    Joined: Dec 6, 2008
    Posts: 109

    Weird A
    Member

    I can't wait on manifold info

    Bill
     
  16. That's great John, well done. What push rods are you using?
     
  17. Mummert
    Joined: Jun 3, 2012
    Posts: 119

    Mummert
    Member

    The pushrods are Smith Bros. .080" wall chromalloy. , 5/16 ball at the bottom for the TREND tool steel lifters.
     
  18. falcongeorge
    Joined: Aug 26, 2010
    Posts: 18,341

    falcongeorge
    Member
    from BC

    Mother of gawd! I understand if you dont wanna give too much detail, but ballparkish, how big is the cam? Guessing 250/260ish??
     
  19. falcongeorge
    Joined: Aug 26, 2010
    Posts: 18,341

    falcongeorge
    Member
    from BC

    Oops edit, I see you posted the cam numbers already.
     
  20. trollst
    Joined: Jan 27, 2012
    Posts: 1,855

    trollst
    ALLIANCE MEMBER

    Seven grand huh? Bet that exhaust note was really impressive, very impressive numbers, I'd love to be there and hear that baby run. Congratulations.
     
  21. rob lee
    Joined: Jul 30, 2006
    Posts: 1,327

    rob lee
    Member
    from omaha,ne

    thanks for posting!
     
  22. Wow, love it when that sort of power is made with the old Y block! I bet some people will look look twice when they see under the hood...
    1.7 rockers and .600 lift, I think you have a secret weapon in there..
     
  23. Wow, congrats John, You did good !!!
     
  24. Hot Rod Rodney
    Joined: Jun 20, 2014
    Posts: 158

    Hot Rod Rodney
    Member
    from USA

    Forever changed my opinion of Y-blocks.
     
    dana barlow likes this.
  25. Cool bananas. Is the bottom end stock?
     
  26. Mummert
    Joined: Jun 3, 2012
    Posts: 119

    Mummert
    Member

    low res sp.JPG The bottom end is pretty stock..

    -1959 292 block lightened 10 lbs
    -Ford steel truck crank offset ground to Honda rod journal
    -Racetec 10cc dome pistons
    -Molnar 6.125 rods
    -Oil pump stock.
    - Mummert Billet timing set
    -Trend tool steel lifters

    -
     
    Last edited: Aug 21, 2014
    dana barlow and 65COMET like this.
  27. metal man
    Joined: Dec 4, 2005
    Posts: 2,949

    metal man
    Member

    So it's a 292 truck crank then? I suspect your heads are mostly responsible for the impressive numbers...combined with the matching cam/intake of course.

    I wish I could afford a pair of those heads for mine.
     
  28. SquirrelTail
    Joined: Oct 24, 2008
    Posts: 36

    SquirrelTail
    ALLIANCE MEMBER

    Very impressive I've been dreaming about a 4-71 blown Y-block. Any video of it on the dyno?
     
  29. Mummert
    Joined: Jun 3, 2012
    Posts: 119

    Mummert
    Member

    No video. Have about a dozen pics and bunch of dyno info. 22 pulls in one day. But definitley worth doing. Dyno's are nothing but good information.
     
  30. Hey John, do you have any plans to manufacture enough of those 1.7 rockers to sell?
    there is only so much valve lift to be had with the 1.54,s .. its got to be a good thing to keep the cam lobe lift smaller
    and achieve more valve lift by changing rocker arm ratio.
     

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