Register now to get rid of these ads!

Hot Rods Almost grenade flathead ?

Discussion in 'The Hokey Ass Message Board' started by khead47, Mar 11, 2018.

  1. khead47
    Joined: Mar 29, 2010
    Posts: 1,767

    khead47
    Member

    Who has first hand experience with crazy high winding flatheads ? I have heard stories of north of 7000 rpm. True, or just "stories " ?
     
    chryslerfan55 likes this.
  2. J. A. Miller
    Joined: Dec 30, 2010
    Posts: 1,688

    J. A. Miller
    ALLIANCE MEMBER
    from Central NY

    Probably be a "short" story.
     
    Baumi, Truck64, belair and 5 others like this.
  3. Rusty O'Toole
    Joined: Sep 17, 2006
    Posts: 9,608

    Rusty O'Toole
    Member

    Heard a story that Zora Arkus Duntov's first experience of a Ford V8 was in eastern Europe before the war, riding in a friend's 1937 Ford. One time they hit 100 down a long hill. Later he calculated that the engine was turning 7000 RPM. This sold him on the Ford's potential as a performance engine and led to the invention of the Ardun hemi heads a few years later.

    This was from an interview in which he was asked how he came up with the idea of the Duntov heads.
     
    Last edited: Mar 11, 2018
    LOU WELLS and mad mikey like this.
  4. GMC BUBBA
    Joined: Jun 15, 2006
    Posts: 3,385

    GMC BUBBA
    Member

    Most of the rpm storys you hear are a low gear rev up . Maybe and then just maybe there tach hit 7000 rpm.
    Our Bonneville flathead at the salt ran 4300 at the the one mile, 4300 at the two mile and 4300 at the three mile. I needed 4500 to break the record and never ever found it.............When i hear these rpm numbers i ask was that in high gear (1 to 1) ????
     
    jimgoetz, Bandit Billy and LOU WELLS like this.

  5. Probably in their minds. If it did hit 7 Grand probably not for long.
     
    LOU WELLS likes this.
  6. Rusty O'Toole
    Joined: Sep 17, 2006
    Posts: 9,608

    Rusty O'Toole
    Member

    Flathead V8s made max HP @ 3800 RPM which means it should have been able to hit 4500 in stock form. Was surprised to find they all made maxHP @the same RPM from 1932 to 1953.
     
  7. 3340
    Joined: Jun 4, 2010
    Posts: 578

    3340
    Member

    What is a safe cruising rpm for a stock 100 hp flathead in a roadster


    Sent from my iPhone using The H.A.M.B. mobile app
     
  8. bowie
    Joined: Jul 27, 2011
    Posts: 2,777

    bowie
    ALLIANCE MEMBER

    "High" winding being a relative term... I grenaded seven of them back in the 70's all in the same '38 Ford pickup. Our company had a row of about a dozen '46- '52 F-6 retired drill rigs in our shop yard. I'd pull the flatty's stick on some alum heads, used dirt racer cams that I bought at Hershey for about $10-$20 apiece then mount my trusty Offy 4bbl intake with an adapter to mount my 500cfm Holley. Most of them ran really good (for a flathead). They all ran the best right before they would blow up...no BS. Onetime I was passing a trucker out on route 81 at about 80 mph... Till I saw a con rod bouncing on the road in my rear view mirror. That truck is still sittn' with the last blown one in it. Great fun at the time... : 08FD8AA4-BAF3-43C4-B584-39CB913F98ED.jpeg 30859B62-470B-4EC4-BCC1-39978684D5CB.jpeg
     
    Last edited: Sep 16, 2020
  9. choptop40
    Joined: Dec 23, 2009
    Posts: 4,018

    choptop40
    ALLIANCE MEMBER

    Still they run real nice..uncorked
     
  10. RICK R 44
    Joined: Dec 13, 2009
    Posts: 457

    RICK R 44
    Member

    7000 rpm at 100mph with 600x16 tires as on a 36 Ford car works out to a 5.90 to 1 rear gear. I don't think so!!!
     
    55styleliner likes this.
  11. khead47
    Joined: Mar 29, 2010
    Posts: 1,767

    khead47
    Member

    Thanks all. I was thinking lower gears ( trans ).
     
  12. J. A. Miller
    Joined: Dec 30, 2010
    Posts: 1,688

    J. A. Miller
    ALLIANCE MEMBER
    from Central NY

    This seems to be true of most engines. Lol
     
    Baumi, olscrounger and bowie like this.
  13. Falcon H
    Joined: Mar 11, 2015
    Posts: 142

    Falcon H
    Member
    from Waco Texas

    Maybe not if you embrace the low end by using a tiny cam.;)
     
  14. I have seen some pretty extreme flatheads built for the salt that may have rev potential. But they are mostly just flathead in name or at least for anything that we would encounter they are just flathead in name. Billet cranks, custom built heads cams blowers dual mags blowers and injectors.

    The flathead in this roadster may approach big revs in the proper environment.

    208-Fazio-Tardel-McKenzie-roadster-450x338.jpg
     
    KiWinUS likes this.
  15. J. A. Miller
    Joined: Dec 30, 2010
    Posts: 1,688

    J. A. Miller
    ALLIANCE MEMBER
    from Central NY

    What's the fun in that?;)
    We had cheap POS cars we bought to drive in winter because of the salt they dump on the roads. We would beat the living crap out of them and come spring time they would beg us to put them out of their misery! Rev, rev, rev -Boom
     
  16. tim troutman
    Joined: Aug 6, 2012
    Posts: 370

    tim troutman
    ALLIANCE MEMBER

    I don't know what rpms this turned but he has told me about running over crankshafts image2 (1).JPG
     
  17. Bandit Billy
    Joined: Sep 16, 2014
    Posts: 7,966

    Bandit Billy
    ALLIANCE MEMBER

    I have a 4500 rev limiter chip to make sure I don't try to write a check my flathead cant cash.
     
    Never2low and J. A. Miller like this.
  18. deucemac
    Joined: Aug 31, 2008
    Posts: 1,156

    deucemac
    Member

    I have built many flatheads in my life and never heard of one turning 7000. The highest reving flathead I ever had was a 53 Merc motor and it would rev to 5700 and make me real nervous every time I did it. Usually in what I found is getting a flathead over 5000 rpms usually causes an instant pile of scrap metal with a trail of oil under the car and as far back as you coasted.
     
    olscrounger, bowie and Bandit Billy like this.
  19. khead47
    Joined: Mar 29, 2010
    Posts: 1,767

    khead47
    Member

    Seems I heard of some dirt track roundy round Flatties with 180 degree cranks turning unreal revs.
     
    dan c likes this.
  20. FOURTYDLX
    Joined: Feb 22, 2006
    Posts: 718

    FOURTYDLX
    Member

    I don.t think so, Just tales, makes it fun for young folk's to listen too., Bubba said it all. The late John Bradley said no way. With out scattering.
     
    Nicholas Coe and olscrounger like this.
  21. flatjack
    Joined: Feb 13, 2007
    Posts: 941

    flatjack
    Member

    I've been waiting to hear a comment from Pete.
     
    tubman and flatheadpete like this.
  22. bowie
    Joined: Jul 27, 2011
    Posts: 2,777

    bowie
    ALLIANCE MEMBER

    Had to bring this subject back up... just for fun!
     
  23. flatheadpete
    Joined: Oct 29, 2003
    Posts: 10,211

    flatheadpete
    Member
    from Burton, MI

    Me? I'd shift my bored Merc a tad over 5...it was scary. Ran great, especially puttering around town.
     
  24. flatheads are like Levis, most comfortable when they are just about used up.
     
    bowie, lonejacklarry and flatheadpete like this.
  25. choppedtudor
    Joined: Nov 28, 2009
    Posts: 684

    choppedtudor
    Member

    yep, I have a spare block on the stand in the shop because I KNOW the bottom end is gonna fall out of this....
     

    Attached Files:

  26. tubman
    Joined: May 16, 2007
    Posts: 5,856

    tubman
    ALLIANCE MEMBER

    Sorry man, wrong "Pete". Maybe if someone were to ask this on "The Ford Barn", the real "Pete" might respond.
     
    Last edited: Sep 15, 2020
    flatheadpete likes this.
  27. tubman
    Joined: May 16, 2007
    Posts: 5,856

    tubman
    ALLIANCE MEMBER

    Great looking engine, but I have to ask : Are you a plumber, by trade?:D
     
    Bandit Billy likes this.
  28. flatheadpete
    Joined: Oct 29, 2003
    Posts: 10,211

    flatheadpete
    Member
    from Burton, MI

    I figured as much...;)
     
  29. dan c
    Joined: Jan 30, 2012
    Posts: 2,250

    dan c
    ALLIANCE MEMBER

    i've also heard about high-revving flatheads with 180* cranks. they sound like a 4 cylinder, but it eliminates the problem with the siamesed center exhaust ports.
     
  30. yellow dog
    Joined: Oct 15, 2011
    Posts: 470

    yellow dog
    Member
    from san diego

    three main bearings isn't the best starting point, however breathing and exhaling is a much bigger
    constraint. A few Arduns overcame the breathing part and nudged substantially beyond 4500 with
    the 3 main bearings and welded cranks.
     

Share This Page

Register now to get rid of these ads!

Archive

Copyright © 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Terms of Service. Privacy Policy.

Atomic Industry
Forum software by XenForo™ ©2010-2014 XenForo Ltd.