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Technical Merc crank swap

Discussion in 'The Hokey Ass Message Board' started by Boden, Jul 28, 2019.

  1. Boden
    Joined: Oct 10, 2018
    Posts: 330

    Boden

    So I have a 53 ford block and all the parts to it. I bought a Merc crank from a 49 Merc. What parts from the Merc motor do I need to b able to run the Merc crank in my ford block. Ps the Merc block is cracked badly and has one of the cylinders blown into the water jackets.



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  2. cbillelder
    Joined: Dec 17, 2010
    Posts: 636

    cbillelder
    Member

    All you will need is a set of Merc pistons. The wrist pin hole is located higher in them to compensate for the longer stroke.
     
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  3. Boden
    Joined: Oct 10, 2018
    Posts: 330

    Boden

    Ok. So the rods are the same on ford and Mercury’s. And also. I was wondering if you use ford pistons with a Merc crank will u boost the compression?


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  4. dirty old man
    Joined: Feb 2, 2008
    Posts: 8,154

    dirty old man
    ALLIANCE MEMBER

    The Ford piston would protrude above block deck about .125"if used with a
    4" stroke Merc crank.
     
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  5. AVater
    Joined: Dec 9, 2008
    Posts: 2,011

    AVater
    ALLIANCE MEMBER
    1. Connecticut HAMB'ers

    I believe you need Merc rods too
     
  6. Boden
    Joined: Oct 10, 2018
    Posts: 330

    Boden

    You do need Merc rods? The old Merc rods I had are completely shot


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  7. Are the flywheels the same between Ford and Mercury? I'm asking, because that issue came up here. Bolt pattern?
     
  8. dirty old man
    Joined: Feb 2, 2008
    Posts: 8,154

    dirty old man
    ALLIANCE MEMBER

    I'm, almost 100% certain the Ford and Merc rods are the same. The OEM Merc flywheel was drilled for a Borg& Beck clutch and a Long for the Ford has a different bolt pattern, but again, almost 100% sure the bolt pattern on the rear crank flange is the same for both.
    Been over 50 years since I was inside a flathead, so it might be a good idea to check further,. maybe on the Ford Barn.
     
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  9. tubman
    Joined: May 16, 2007
    Posts: 4,313

    tubman
    ALLIANCE MEMBER

    I put a '51 Merc engine in my '51 Ford and used the Ford flywheel (which had just been resurfaced) and it fit perfectly. Ford and Merc rods are the same. I have read that someone on the west coast sells new French rods for $125, which is in the neighborhood of the cost of having the old ones rebuilt. Sounds like the way to go.
     
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  10. Boden
    Joined: Oct 10, 2018
    Posts: 330

    Boden

    I’m on a very tight budget. I’m only 13 and I work at a machine shop I bring home 200 a week and get to machine my stuf for free. I’m just going to sandblast the rods I have and match the weights.


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  11. AVater
    Joined: Dec 9, 2008
    Posts: 2,011

    AVater
    ALLIANCE MEMBER
    1. Connecticut HAMB'ers

    My apologies folks. Had a case of CRS.

    Knew pistons and cranks were different so incorrectly thought the rods were different.
     
  12. Bandit Billy
    Joined: Sep 16, 2014
    Posts: 5,357

    Bandit Billy
    ALLIANCE MEMBER

    Same rods. Shot peen, use ARP nuts, re-size if necessary and reuse. I used a merc crank, 8BA rods and merc pistons (must use merc pistons) on my 49 8BA. Use that merc timing cover (aluminum) and give it a littlie polish (it will look sweet). And use the merc oil pan with the windage tray in it if it is (5 two letter words in a row, double word score) still on the motor.
     
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  13. Boden
    Joined: Oct 10, 2018
    Posts: 330

    Boden

    No problem. Thansk for clarifying


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  14. And a big hand to you for starting on this journey,kudos.
     
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  15. acme30
    Joined: Jun 13, 2011
    Posts: 138

    acme30
    Member
    from Australia

    I can't recall if the compression is boosted by adding the merc crank to a standard 53 block and heads but if does it won't be much. You pick up 10 HP by going to the 4" crank but that is from increasing the stroke rather than compression.
     
  16. Good for you, great to see, show us some pics of your project


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  17. Boden
    Joined: Oct 10, 2018
    Posts: 330

    Boden

    Thank you. I love this stuff with all my heart.


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  18. Boden
    Joined: Oct 10, 2018
    Posts: 330

    Boden

    I acquired a set of Edelbrock heads from my uncle


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  19. Boden
    Joined: Oct 10, 2018
    Posts: 330

    Boden

    Ok. For sure


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  20. Boden
    Joined: Oct 10, 2018
    Posts: 330

    Boden

    I have some pics of the project for ya [​IMG][​IMG][​IMG][​IMG][​IMG][​IMG][​IMG][​IMG][​IMG][​IMG]


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  21. Rockysfirstshubox1.jpg Bowden......A more perfect project couldn't be had as far as a traditional ford project. I did exactly the same thing at 16 with my first car...a 50 ford crestliner 2 door with a cracked block. I bought a 53 merc motor for it and after spending $36 for rings, bearings and gaskets, my dad and I ground the valves, honed the cylinder bores, set valve lash bolted on headers and a Rochester 4 barrel carb and put it in the old ford. It ran soooooooo sweet!
     
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  22. Boden
    Joined: Oct 10, 2018
    Posts: 330

    Boden

    WOW! That’s awesome to hear. I have been hearing that this motor is weak and it will be horrible but you post boosted my motivation. And it seems liek I’m going a little crazier than you did so mine might be even faster. Lol.

    Thansk a lot,
    Boden


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  23. drtrcrV-8
    Joined: Jan 6, 2013
    Posts: 1,149

    drtrcrV-8
    Member

    Boden : That Crank in the pictures from Thursday needs to at LEAST be polished, but from seeing the connecting rod bolt scars in it, I'd say "GET IT TURNED"! And when you put everything back together, put some pieces of gasoline hose over your rod bolts BEFORE you put the piston/rod assemblies back into the block!
     
  24. leon bee
    Joined: Mar 15, 2017
    Posts: 308

    leon bee
    Member
    from Arkansas!

    Boden: You got a lot to do there, but that engine won't be "weak". It'll be a Ford flathead.
     
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  25. Bearing Burner
    Joined: Mar 2, 2009
    Posts: 838

    Bearing Burner
    Member
    from W. MA

    Did you have the Ford block checked for cracks ? The last flathead I built took 4 blocks before I found a good one.
     
  26. Boden
    Joined: Oct 10, 2018
    Posts: 330

    Boden

    Yea. I’m getting it cut


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  27. Boden
    Joined: Oct 10, 2018
    Posts: 330

    Boden

    Haha. Ya. And working at the machine shop really helps out.


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  28. Boden
    Joined: Oct 10, 2018
    Posts: 330

    Boden

    So this motor is being bored out .040 over. Is getting a SU1A can grind, hollow Johnson lifters, my uncle gave me a set of sharp heads, that Merc crank. And A little port work. All new bearings. All I need to get left is a intake, headers, and carbs. I have one 94 and I want another one or 2 more depending on the intake


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  29. Boden
    Joined: Oct 10, 2018
    Posts: 330

    Boden

    And if anyone has a intake (2 or 3 deuce) or a set of headers. Please let me know if you are willing to sell it. It is one of the last thing I need


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  30. drtrcrV-8
    Joined: Jan 6, 2013
    Posts: 1,149

    drtrcrV-8
    Member

    BTTT I know it's another expense, but balancing the crank, rod & piston assemblies, front hub, flywheel & clutch assemblies, all as a unit. It makes them live a lot longer!!
     

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