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  1. #16
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    What is meant by "staking" the locator pin and how is it done?

  2. #17
    Join Date
    Jun 2003
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    minocqua, wis
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    Quote Originally Posted by Dave S View Post
    I think males are good.....don't know where ya going to lite em. 6000 rpm....100 per sexond.....things are happening fast. Turn up the speed....Ring flutter.
    when I am strollin in my boat I get heart flutter

  3. #18
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    Shreveport, La.
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    Very interesting thread

  4. #19
    Join Date
    May 2014
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    Livingston, Louisiana
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    Quote Originally Posted by JPEROG View Post
    Detonation is the biggest culprit. Out of all the 2.4s and 2.5s that I have run, I had one pin rattle out. It made a mess but I shouldn't have been running old fuel and knew better.

    Joe
    Im in this same boat. I think on a hot rod with extreme cylinder temps it's s good idea to top pin. But, I've never lost a side pin yet ( my tight wod self too cheap to get top pinned). I think heat and age is the culprit, as long as you don't run em hot, lean, and run um for 20 years you prob. won't have a problem. I do believe it's good insurance, but hasn't bit me yet.

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  6. #20
    Join Date
    Sep 2002
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    Atascadero,Calif
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    Having quite a few OMCeizures thru the years, I acquired a drum of dead or dieing pistons. Of those that dropped or loosened the locating pin it is my opinion ;-) that most if not all were caused by quick temperature change. Dissimilar metal expansion/contraction. Example: not warming up the engine thoroughly before accelerating hard. I now make it a point to drive below 4,500 for a few minutes. Also after flogging it running at a slower speed to allow it to circulate water to cool the block and let the pistons cool off also.
    Doing WOT plug checks is an example.
    If the cooling system was a closed loop rather than all the water draining out as soon as the engine stopped, the water/block/pistons/locator pins would cool gradually.
    I have had staked pin pistons fail and top pinned pins push the weld up. The only way...again IMHO ;-) , is to bend the pin so it would have to wallow out the whole hole to fail.
    Gary

    I don't know enough, to leave well enough alone.

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  8. #21
    Join Date
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    Edgewater,B.C. CANADA
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    Quote Originally Posted by eli View Post
    Think it keeps wearing gene trichel from Oshkosh showed me many years ago how to properly stake pins in 86 200 so they don't move outward

    Not sure on the 2.5 but Gene told me the Wiseco's were better than the Mahle on a Bridgeport. He gave a new part number when I did pistons in my BP that had not even been released to the public yet.


    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"

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