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Thread: Merc V6 History

  1. #421
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    They are still locked by the bottom. The rod bearings aren't much of an issue really.

  2. #422
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    So did anybody ever fire old Blue up?

    DB

  3. #423
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    they seem to change the rod bearings each heat in the F1 world, saying they cant get the old quality any more?

  4. #424
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    Quote Originally Posted by Da Bull View Post
    So did anybody ever fire old Blue up?

    DB
    Not that I'm aware of. She resides with Jackie Wilson's son Mark down in Florida. I'm sure Jackie would let us know if and when that ever occurs.

  5. #425
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    Best motor I ever owned was a 1980 175hp 2.0L Merc. First year for the big single trim ram. I never had one issue with that motor after three years of racing. I had it on a 17ft Kona V bottom. Not the fastest hull out there but I learned a lot because I didn`t have to worry about break downs so I was able to concentrate on my set up and driving.

    DB

  6. #426
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    Quote Originally Posted by Da Bull View Post
    Best motor I ever owned was a 1980 175hp 2.0L Merc. First year for the big single trim ram. I never had one issue with that motor after three years of racing. I had it on a 17ft Kona V bottom. Not the fastest hull out there but I learned a lot because I didn`t have to worry about break downs so I was able to concentrate on my set up and driving.

    DB
    We had one as well great motor, it's still around and running.

    Dave
    1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
    1988 BAJA Sunsport 186, 96 225 Pro Max
    79 12' Auminum, 95 Merc 9.9
    RIP Stu
    "So many idiots, so few bullets"

  7. #427
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    I had a '78 2.0 175....ran it on Nitrous Oxide for 4 years! Never had an issue with h exception of drive shafts and prop shafts!
    I did have to run 24v to the starter where it would crank in cold weather....no issues there either!
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  8. #428
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    I was there yesterday, still looks like when I dropped it off

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  10. #429
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    Hells teeth John, Mark and Craig been up to their fetlocks ------at least it's standing up straight !
    Its a wonder the COSWORTH'S still under cover-------wonder if I'll get to see either one run again ?

  11. #430
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    Quote Originally Posted by rckid74 View Post
    The rods were from billets because we didn't have forgings at that point. The project had not been approved for production tooling until somewhat later. They were cracked right from the start.
    So whats the strength difference from billet to a forging or can it be either way due to the freedom of the billet machined shape versus a forging?
    Any difference when hardening it for the rollers?
    Last edited by powerabout; 01-03-2018 at 04:19 AM.

  12. #431
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    Quote Originally Posted by powerabout View Post
    So whats the strength difference from billet to a forging or can it be either way due to the freedom of the billet machined shape versus a forging?
    Any difference when hardening it for the rollers?
    If the material is the same for both (8620H vacuum-degassed -- bearing quality steel) then the strength should be the same for both assuming the cross-sections are the same. I like the grain structure better in the forging. The hardening should be the same. I'm a mechanical engineer not a metallurgist. So this is not a very professional opinion.
    I will say that for a 2-stroke rod, its not the strength of the rod that's so important, it's the quality of the material and the heat treatment of the surface the rollers ride on that really counts. 2-stroke rods almost always start to fail by spalling on this area first.
    Last edited by rckid74; 01-04-2018 at 10:26 PM.

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  14. #432
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    [QUOTE=rckid74;3012015]If the material is the same for both (8620H vacuum-degassed -- bearing quality steel) then the strength should be the same for both assuming the cross-sections are the same. I like the grain structure better in the forging. The hardening should be the same. I'm a mechanical engineer not a metallurgist. So this is not a very professional opinion.
    I will say that for a 2-stroke rod, its not the strength of the rod that's so important, it's the quality of the material and the heat treatment of the surface the rollers ride on that really counts. 2-stroke rods almost always start to fail by spalling on this area first.

    Jerry, and this is just my two cents, but when we were making upwards of 3000 622-4850 rods per day at tmes, plus your 624- rods, there would have been no way carving them from billet - Modern Drop Forge in Blue Island IL was our forging vendor, and very good at it also. I think the prior vendor was out of Rock Falls Illinois and there were times we had to 100% inspect incoming rod forgings due to misstrikes, mismatch, poor fill, straightness, you name it. Modern had thier act together - if there was a price increase it was offset by the quality of the forging. We spent more time fighting our own copper plating mistakes and the silver strike vendor - Electroplating. Ole' Buck Bucarma - he used to carry his supply of silver plate in the trunk of his Cadillac!
    Last edited by bernie; 01-05-2018 at 02:52 PM.

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  16. #433
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    Can you forge an H beam rod?

  17. #434
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    Can you explain the cracked cap procedure
    Never seen a vid on that..drill freeze snap?
    Last edited by powerabout; 01-05-2018 at 10:56 PM.

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  19. #435
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    Quote Originally Posted by powerabout View Post
    Can you explain the cracked cap procedure
    Never seen a vid on that..drill freeze snap?
    I was told by a Mercury rep some 30 years ago it was just what you said. Machine-Freeze- Snap with a cone, found a video that might be what is done today?

    https://www.youtube.com/watch?v=QlVrDJBiqd4
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