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Technical flathead blower

Discussion in 'Traditional Hot Rods' started by hotrodnomader, Oct 24, 2013.

  1. hotrodnomader
    Joined: Feb 10, 2011
    Posts: 1,747

    hotrodnomader
    ALLIANCE MEMBER

    I'm thinking of building a flathead with a blower. I've never had a blower motor before. With a blower you obviously get the cool factor of having a blower plus the increase in power, but what are the downfalls/negatives of having a blower ? Other than cost of course.
     
  2. hotrodderhaag
    Joined: Jan 22, 2007
    Posts: 2,124

    hotrodderhaag
    Member

    well,
    let me see where i can start... the EGT's are high, the intake temps are high thus causing the motor to run warmer than normal of your not prepaired for it.. timing is a real bitch, so is getting the plug gap just perfect... its takes alot of time to get two carbs to tune in just right.. if you go with a vintage blower, parts are hard to come by, and i drive mine a lot so its alot of clean oil changes and such to care for it. blowers are a different style of driving. all in all i love my blown flathead. there is nothing more cool to people when they see you drive in with a blown flatty!!
    oh and the sound is great!! mine whistles like a bastard when your lead footing it.
     
  3. Crusty Nut
    Joined: Aug 3, 2005
    Posts: 1,834

    Crusty Nut
    Member

    Huh, I put a blower on a homebuilt intake, home built drive system and just drove the shit out of it. Sure, you have to fiddle with the carbs a bit, but no more so than 2 carbs on a non-blown set up. Flatheads breathe poorly and IMHO a blower is one of the best things to do to one.
     
  4. Once you get blown you can never go back.........
    [​IMG]
     

  5. GOSFAST
    Joined: Jul 4, 2006
    Posts: 254

    GOSFAST
    Member

    No "downfalls", really no "negatives" (not counting the costs of course), they are actually fun to drive.

    Have been involved with more "blown" builds a few years ago, not as many today, but no issues whatsoever.

    The one item I would recommend is a "girdle" that straddles the center main and ties into the pan rails and block web. Pan still works. I made these at one time but have none available anymore. This is not to be confused with the main cap "strap", it has more support. I have a photo of the "pattern", but that's about it.

    Thanks, Gary in N.Y.

    P.S. Here's a shot of one, I believe taken at the N.Y. coliseum, was a 2x4's setup. Have done single 4's as well. And also a shot of the "girdle" pattern.
     

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    Last edited: Oct 24, 2013
  6. B Ramsey
    Joined: Mar 29, 2009
    Posts: 646

    B Ramsey
    Member

    there is one that pops up on san diego craigslist every now and then..
     
  7. Fullraceflathead
    Joined: Apr 27, 2012
    Posts: 23

    Fullraceflathead
    Member

    Hello,
    I made a video back in the 1990's called "Fullrace Flathead"
    I detailed building a 296 Supercharged Flathead that I built for my front Engine dragster.
    Let me know if interested and I can transfer it to a DVD.
    I originally offered it on VHS for $20.00
    That's the Dragster and the same "Fullrace Flathead" that is shown in the Video in my Avitar on the left.
     
    Last edited: Oct 24, 2013
  8. bobadame
    Joined: Jan 20, 2009
    Posts: 174

    bobadame
    Member

    I would be interested in a DVD.
     
  9. I've got a bunch of flathead stuff that will be for sale soon including a nice blower setup...PM me for details.

    Steve
     
  10. Kevin Lee
    Joined: Nov 12, 2001
    Posts: 7,440

    Kevin Lee
    Super Moderator
    Staff Member

    I would as well.
     
  11. hotrodderhaag
    Joined: Jan 22, 2007
    Posts: 2,124

    hotrodderhaag
    Member

    ImageUploadedByH.A.M.B.1382665377.365081.jpg ImageUploadedByH.A.M.B.1382665424.592006.jpg
    ImageUploadedByH.A.M.B.1382665612.968533.jpg ImageUploadedByH.A.M.B.1382665750.413824.jpg


    Posted using the Full Custom H.A.M.B. App!
     
  12. Model A Mark
    Joined: Apr 30, 2008
    Posts: 1,267

    Model A Mark
    Member
    from dallas
    1. Holley 94 Group

    Man thats a good looking set up hotrodderhaag, any idea how much boost that puts in the engine ?
     
  13. hotrodderhaag
    Joined: Jan 22, 2007
    Posts: 2,124

    hotrodderhaag
    Member

    I put 3.5-4 lbs at WOT. I'm still having some timing issues with the advance ... Its has the ability to run better once I straighten it out . But it's a good running old flathead


    Posted using the Full Custom H.A.M.B. App!
     
  14. Rusty O'Toole
    Joined: Sep 17, 2006
    Posts: 9,608

    Rusty O'Toole
    Member

    McCulloch on a stock engine gives about 4 or 5 PSI and 25% more HP.

    Flatheads respond well to supercharging because they have low compression and the breathing is not the best.

    Don't go crazy and you should get 25% - 50% more HP without hurting driveability and reliability too much. 5 - 7 PSI.

    Disadvantages, cost, complexity, weight. One more thing to go wrong. Keep it mild and it shouldn't cause problems.

    PS the above was posted while I was typing but I will let my answer stand.
     
  15. Model A Mark
    Joined: Apr 30, 2008
    Posts: 1,267

    Model A Mark
    Member
    from dallas
    1. Holley 94 Group

    Sure is a good looking rig..
     
  16. hotrodnomader
    Joined: Feb 10, 2011
    Posts: 1,747

    hotrodnomader
    ALLIANCE MEMBER

    thanks for the info
     
  17. woodypecker
    Joined: Jan 23, 2011
    Posts: 300

    woodypecker
    Member

    PITA to set valve lash.
     

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