Register now to get rid of these ads!

Twin Engine Coupling (How Do You Get Two V8's In-Line?)

Discussion in 'The Hokey Ass Message Board' started by Scotch Buzzard King, Sep 8, 2011.

  1. Scotch Buzzard King
    Joined: Apr 28, 2007
    Posts: 1,103

    Scotch Buzzard King
    Member

    I know one of you's is building a twin engine inline V8 dragster or hot rod. My question is how did you connect up the motors? How did the old guys connect up the motors? Any pictures? Any build pictures?
     
  2. 48fordor
    Joined: Jan 16, 2009
    Posts: 128

    48fordor
    Member
    from York, PA


    For two in line, I'm told by someone who ran one in the '60s (two injected flatheads) that he used two large gears of the same size. One at the back of the crank on the front engine, and one at the front of the crank on the rear engine. He brought them together and wrapped it with double roller chain just long enough to go around. This secured the two gears together face to face and linked the cranks together.


    Edit:
    Ha! I think the owner is here on the hamb, here is his page:
    http://www.norbsplace.com/page3.html
    with the info. I traded some email with him a few years back.

    Goes to show you everything is already here on the hamb.
     
    Last edited: Sep 9, 2011
  3. titus
    Joined: Dec 6, 2003
    Posts: 4,614

    titus
    Member

    Double row chain and a couple of sprockets is one way, ive collected up the stuff to do it with for a "future" project.

    jeff
     
  4. Deuces
    Joined: Nov 3, 2009
    Posts: 11,993

    Deuces
    Member
    from Michigan

    I think the # 1 cylinders on both motors would fire @ 45 degrees apart..... Or something like that...:confused:
     
    Register now to get rid of these ads!

  5. STURGIS39
    Joined: Mar 31, 2010
    Posts: 826

    STURGIS39
    Member

    Alignment is the most important thing. The engine mounts need to be adjustable and allow the engines to be move sideways and up and down. Shims and feeler gauges will be required and a lot of time and patience. There are all types of couplers for motors and pumps. McMaster Carr is a good source for couplers.

    I have used a rubber hose and hose clamps on some small applications.

    When we were kids, some of the toys used ball point pen ink tubes.
     
  6. DocWatson
    Joined: Mar 24, 2006
    Posts: 10,222

    DocWatson
    Member

    Cattle dogs...........
     
  7. 296moon
    Joined: Oct 24, 2007
    Posts: 388

    296moon
    Member
    from england

    I am building an inline twin, at first I was going to go with the two sprockets and double chain route but when looking for the box to rearend coupler I found that I could get male and female blank rings, these are as I write this, being fitted to flanges that will bolt crank to crank so the front engine will slide in, it will now be far easier to take apart and timeing between the two can be ajusted by ether the moveing the coupler round a tooth (18 degrees per tooth) or if it needs more we can offset drill the flanges, heres a pic of the rear coupler, Ill post a pic of the middle one when I get it back from my machinest frend trevor, [​IMG]
     
  8. hotroddub
    Joined: Dec 28, 2009
    Posts: 479

    hotroddub
    Member

  9. haroldd1963
    Joined: Oct 15, 2007
    Posts: 1,142

    haroldd1963
    Member
    from Peru, IL

    This should be an interesting thread...keep the pictures and ideas coming!
     
  10. Scotch Buzzard King
    Joined: Apr 28, 2007
    Posts: 1,103

    Scotch Buzzard King
    Member

  11. enjenjo
    Joined: Mar 2, 2001
    Posts: 2,284

    enjenjo
    Member
    from swanton oh

    The engines do not need to be timed together.
     
  12. john walker
    Joined: Sep 11, 2008
    Posts: 814

    john walker
    ALLIANCE MEMBER

    a lot of stress on a damper and single key. what is beefed up in order to keep it together?
     
  13. Deuces
    Joined: Nov 3, 2009
    Posts: 11,993

    Deuces
    Member
    from Michigan

    As stated above... They are timed to fire @ 45 degrees from each other on the # 1 cylinders...
     
  14. enjenjo
    Joined: Mar 2, 2001
    Posts: 2,284

    enjenjo
    Member
    from swanton oh

    It's not necessary. It will run just as well at 5 degrees, or 40 degrees. It may sound different, but the output is the same. The engines do not have to be the same size, or the same make, or the same number of cylinders.
     
  15. dreracecar
    Joined: Aug 27, 2009
    Posts: 1,737

    dreracecar
    Member
    from so-cal

    Ivo's "SHOWBOAT"[​IMG]
     
  16. Scotch Buzzard King
    Joined: Apr 28, 2007
    Posts: 1,103

    Scotch Buzzard King
    Member

    Now I'm confused...
     
  17. 296moon
    Joined: Oct 24, 2007
    Posts: 388

    296moon
    Member
    from england

    There would be alot of stress if my engines were blown but sadly their not, so we have just hardend the key, we can add more keys or bolts if anything shears but should be ok with mine, I wanted the engines as close a possible so we are useing these couplers from mark williams, [​IMG] [​IMG] [​IMG]
     
  18. Blind Elwood
    Joined: Jul 1, 2010
    Posts: 224

    Blind Elwood
    Member

    45* is not really the best.It's hard on cranks and bearings. I always recommend going with 10*. What your looking for is 8 long burns instead of 16 short ones. It's really all about the harmonics between both engines. Look up Toymakers thread he set his engines up @ 10* check his video of his engines running.

    Blind Elwood
     
  19. 296moon
    Joined: Oct 24, 2007
    Posts: 388

    296moon
    Member
    from england

    Yes your right, but I want to try 90 off as well
     
  20. Scotch Buzzard King
    Joined: Apr 28, 2007
    Posts: 1,103

    Scotch Buzzard King
    Member

    Actually 296moon, you're coupler idea is a pretty good one. You say that Mark Williams makes those? Does he have a website?
     
  21. Deuces
    Joined: Nov 3, 2009
    Posts: 11,993

    Deuces
    Member
    from Michigan

    I think it's Mark Williams Spools.. :confused:
     
  22. 296moon
    Joined: Oct 24, 2007
    Posts: 388

    296moon
    Member
    from england

  23. Scotch Buzzard King
    Joined: Apr 28, 2007
    Posts: 1,103

    Scotch Buzzard King
    Member

  24. Weedburner
    Joined: Nov 16, 2010
    Posts: 139

    Weedburner
    Member
    from Wa State

    I built an outlaw dirt late model that had the engine installed backwards, drove the car off of the front on the engine (damper end). I just installed the hub and drilled a couple more evenly spaced holes along the parting line between the hub and crank for 2 extra "keys", actually just a couple pieces of steel rod lightly tapped into the holes + loctite. Never a problem, ran that car for a couple years.
     
  25. bigskybob
    Joined: Jan 9, 2007
    Posts: 39

    bigskybob
    Member

    Just curious Weedburner - WHY?
     
  26. Weedburner
    Joined: Nov 16, 2010
    Posts: 139

    Weedburner
    Member
    from Wa State

    Easy way to get a reverse rotation drivetrain. The water pump/timing gears/oil pump all moved to the back of the engine (it was BBMopar) and with the remote mounted transmission, it all helped the heavy engine beat an engine setback rule.
     
  27. Blind Elwood
    Joined: Jul 1, 2010
    Posts: 224

    Blind Elwood
    Member

    It's your time and your dime. The outcome will be the same.

    Blind Elwood
     
  28. Bigchuck
    Joined: Oct 23, 2007
    Posts: 1,041

    Bigchuck
    Member
    from Austin, TX

    I was under the impression that the press fit of the damper on the crank snout and not the key is what absorbed the shear/stress.
     
  29. 296moon
    Joined: Oct 24, 2007
    Posts: 388

    296moon
    Member
    from england

    It shouldent make any power difference but might sound better?
     
  30. Hemiman 426
    Joined: Apr 7, 2011
    Posts: 321

    Hemiman 426
    Member
    from Tulsa, Ok.

    My cousin Buzz built this years ago. Still cruises it around when he can. I'll try to get some pics of how he joined his and post them.

    [​IMG]

    [​IMG]

    [​IMG]
     

Share This Page

Register now to get rid of these ads!

Archive

Copyright © 1995-2013 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.