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Message: <blockquote data-quote="ess530i" data-source="post: 16764" data-attributes="member: 13496"><p>The car: BMW E60 530i with M54B30 engine running on ESS TS2 @ 10psi, stock internals, water/meth injection (50/50), okada projects plasma coils, denso ik22 iridium plugs (1-step colder than stock), remus exhaust & cold air intakeThe situation: Recently lost compression on cylinder # 3 & 4. car is drivable but with rough idling & exhaust note and about 10% loss of power. was running shell helix ultra 5W-40 & v-power only fuel when the engine lost compression. suspect head gasket or exhaust / intake valve failure.The plan: To rebuild the engine with forged internals to have the problem solved once and for all (hopefully). quote received from Top End Performance in US for forged JE pistons + rings, forged pauter conrods + bolts, cometic MLS head gasket, ARP head & main studs, race bearing set = +/-USD3k. seems to me that they are the only one who carry a full range of BMW engine rebuild parts. the mechanic: 'fatty' and the boyssifus... need your advice to ensure the plan is successful. some of my doubts include:1. the bore and compression ratio for my set up - stock is 84.0mm / 10.2:1, am thinking of going for 84.5mm / 9.0:1. is this level safe enough for 10psi of boost? at stock ratio i am getting occasional knocks even with colder plugs, meth injection & CAI. will a reduction of compression ratio affect the drivability at low end RPM's, b4 the SC kicks in? what if the SC is removed in future... will it still drive like a stock 530i?2. brand / supplier - is JE pistons & pauter rods ok? have checked with CP and a bunch of dealers they dont deal with BMW partsthis is all i can think of at the moment, will have more coming soon. meanwhile, any input will be very much appreciated. thx...</p></blockquote><p></p>

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