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Custom piston to cylinder wall clearance
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Thread: Custom piston to cylinder wall clearance

  1. 08-11-2011, 09:31 AM #1
    montelibre
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    Custom piston to cylinder wall clearance

    Hi
    A few days ago I received the custom pistons for my Jeep (Supercharguer Stroker 4.6, about 6 psi of boost), but I don't know how choose the piston to cylinder wall clearance.
    In the pistons instructions says:
    SB aplications 0.0025-0.0035"
    BB aplications 0.0035-0.0045"
    What is SB and BB aplications?
    Are differents the Supercharguer aplications?
    Thanks
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  2. 08-11-2011, 11:21 AM #2
    jeepsr4ever
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    Those pistons were made for your bore size. Do not worry about it unless your machinist made the bore smaller than you ordered for.
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  3. 08-23-2011, 08:12 AM #3
    ironman_gq
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    Generally around .004" clearance is standard, some may require a little more and some a little less. Forged pistons will expand more than cast and hypers will be somewhere between the two.
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