Allen Millyard 5 liter V-Twin Based On 2 Pratt & Whitney R1340 Aircraft Cylinders

Don’t ask why? It’s the type of work Allen Millyard likes to do: crazy engines. Of course, except the 2 Pratt & Whitney cylinders, everything else is one-off: connecting rods and aluminum crankshaft cast from wooden molds. Engine runs a dry sump with twin pumps, twin SU carburetors, twin plugs per head. Order one to impress the crowd in Sturgis or to build a bike to win the biggest trophy in the “Most Unusual Class”of the Rat’s Hole Bike Show. Watch the 1st test run.

Zipper's

19 Responses to “Allen Millyard 5 liter V-Twin Based On 2 Pratt & Whitney R1340 Aircraft Cylinders”


  1. 1 CafeSportyTC Mar 29th, 2013 at 9:06 am

    thats pretty awesome… love it when you see flames leaping from the exhuast… mmm delicious…

  2. 2 richard Mar 29th, 2013 at 10:00 am

    ” connecting rods and aluminum crankshaft cast from wooden molds”. Aluminum?

  3. 3 TodT Mar 29th, 2013 at 11:38 am

    What a awesome beast!

  4. 4 Titus McGillicutty Mar 29th, 2013 at 1:35 pm

    why? ….. because – sound of that motor is sick – awesome

    here’s another mad scientist at work
    http://www.youtube.com/embed/daVDrGsaDME

  5. 5 Rodent Mar 29th, 2013 at 4:31 pm

    Neat engine!

  6. 6 Dave Blevins Mar 29th, 2013 at 7:20 pm

    I just love this kind of stuff. Just wonderful.

  7. 7 Iron Horse Mar 29th, 2013 at 7:47 pm

    Very cool! You gotta love when someone builds something like this basically from scratch.

    I also seem to remember that the Gunbus motorcycle that was built by a German shop had an engine that also utilized cylinders from a radial engine of some sort. I don’t recall that I ever saw any video’s of it running though.

    Great job Allen!

  8. 8 Nobody Mar 29th, 2013 at 11:02 pm

    VTwin with the burble of a radial… mmmm that’s all kinds of fine.

  9. 9 Mr. Dimple Mar 30th, 2013 at 6:53 am

    Entrepreneurial Excellence. Where was this shot? appears to be in UK?
    Wonderful work capturing the essence of WW2 radial cylinders.
    To all human beings…….Keep thinking.

  10. 10 Garry Mar 30th, 2013 at 7:54 am

    A buddy of mine Ian Douglas did the same thing .but he built a complete bike to go with it .THE WARBIRD witch was shown on this blog.

  11. 11 Wikked Steel Mar 30th, 2013 at 8:54 am

    That is incredible! Excellent work.

  12. 12 Capt. Mar 30th, 2013 at 4:19 pm

    Serious overkill…..and I luv it!!! BTW, regarding the “aluminum crank shaft”. I believe you mean’t “aluminum crank case” right?
    Now if we could get some shop to step up and build a bike around this power plant with a gearbox that won’t hand grenade itself the first time ya put that bad boy in gear and twist up the throttle.
    Nice job either way.
    Capt.

  13. 13 Knucklehead Mar 31st, 2013 at 1:20 pm

    That is so cool. Just think of the frame. The heads look like those of a WWII plane engine.

  14. 14 David Mar 31st, 2013 at 11:41 pm

    Ok what could Jesse build around this engine??? Baker can build a tranny.

    SSDD: David

  15. 15 Scott Webster Apr 1st, 2013 at 8:02 am

    Fucking bad ass!!!!!!!!!!!!

  16. 16 Blackmax Apr 1st, 2013 at 6:14 pm

    Damn,straight Baker could build a drivetrain/tranny for it .
    Frame I don;t know ? But there are plenty of guys out here who’d like to give a shot
    What do you think the HP & torque numbers would be ????

  17. 17 Sportster Mike Apr 2nd, 2013 at 7:30 am

    Having seen him riding his Dodge V10 bike last year at Poole Quays Bike Nights and pootling around like it was a little moped I’m looking forward to seeing this BEING RIDDEN ON THE ROAD..

  18. 18 Mike Corbin.com Apr 2nd, 2013 at 8:54 am

    Fantastic, now there is talent..Woried about carbs a little.

  19. 19 nicker Apr 2nd, 2013 at 10:08 pm

    A friend at the Kansas City Plant gave me a copy of an original Pratt drawing for those cylinder heads.
    They are drop-dead gorgeous… as are the heads on this motor.

    Very reminiscent of the 1950’s Royal Enfield parallel twin twin design.

    -nicker-

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