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Thread: S54 Oil Clearances

  1. #1
    Join Date
    Apr 2008
    Location
    Des Moines, IA
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    79
    My Cars
    2004 BMW E46 M3 Coupe

    Question S54 Oil Clearances

    Folks - got some questions for you. I've bought King Racing XP Series bearings for both the rods and main line for my S54 block. I'm using Molnar H-Beam 4340 Billet Rods w/ ARP bolts. The engine will be NA upon rebuild, but down the road will apply Vortech VF-1 supercharger w/ no more than 9 PSI boost applied (around 6-7 PSI initial).


    • What oil clearances are recommended for a modified NA setup to light boost down the road?
    • What would be the piston to wall clearance recommended for this setup? I'm replacing the OE pistons with JE Pro Seal 11.5:1 CR 87.5mm oversized FSR pistons w/ the rings included, if this matters. The cylinders have been bored to 87.5mm, and will be honed using a torque plate to prevent out of roundness, hopefully with plateau brushing to prevent having to break in the cylinders with the piston rings.


    My machinist was referencing to the documentation included in the boxing for the pistons, and the rod / main line bearings, but wanted me to double check with folks already running a similar setup. Thanks!
    2004 BMW e46 ///M3 S54 3.2L I6 NA ~360BHP RTD-6SM | Fully-rebuilt motor (forged lightweight rods & FSR pistons + rebalanced crank) & suspension, Conforti shark injector tune, aFe Stage 2 intake, Megan Racing catless SS headers (ceramic coated) + Status Gruppe sec 1 rasp elim + sec 2 un-resonated X-pipe + DNA motoring muffler (LOUD)
    2013 BMW e82 135i
    ///M-Sport N55 3.0L I6 Twin-scroll Turbo ~380BHP DCT | MHD Stage 2+ tune, aFe Stage 2 intake, free-flow/catless down-pipe + unresonated mid sec + straight piped rear w/ titanium quad burnt tips (LOUD)
    2012 VW GTI Mk6 2.0TSI EA888 2.0L I4 Turbo ~250BHP 6SM | Stratified tune, IE intake, hi-flow cat/downpipe, unresonated mid sec, stock gutted muffler (Sporty, civilized)



  2. #2
    Join Date
    Jan 2016
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    2001 525it
    I would call the folks that make the bearings

  3. #3
    Join Date
    Aug 2009
    Location
    Silver Spring, MD
    Posts
    130
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    03M3 17M540 18A5SB

    I would drop the compression to about 9.5:1

    Quote Originally Posted by twiceasfastasyo View Post
    Folks - got some questions for you. I've bought King Racing XP Series bearings for both the rods and main line for my S54 block. I'm using Molnar H-Beam 4340 Billet Rods w/ ARP bolts. The engine will be NA upon rebuild, but down the road will apply Vortech VF-1 supercharger w/ no more than 9 PSI boost applied (around 6-7 PSI initial).


    • What oil clearances are recommended for a modified NA setup to light boost down the road?
    • What would be the piston to wall clearance recommended for this setup? I'm replacing the OE pistons with JE Pro Seal 11.5:1 CR 87.5mm oversized FSR pistons w/ the rings included, if this matters. The cylinders have been bored to 87.5mm, and will be honed using a torque plate to prevent out of roundness, hopefully with plateau brushing to prevent having to break in the cylinders with the piston rings.


    My machinist was referencing to the documentation included in the boxing for the pistons, and the rod / main line bearings, but wanted me to double check with folks already running a similar setup. Thanks!
    Down the road you will get more boost and more ignition advance before knock. Retarding the timing or otherwise compensating for 11.5:1 isn't normally the way to go.

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