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Engine Builders...4032 vs 2618 forged piston alloy?
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| 10-31-2023, 09:22 AM | #1 |
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Engine Builders...4032 vs 2618 forged piston alloy?
I’m getting ready to bite the bullet and order my forged piston for my N54 build. I was dead set on ordering the Mahle pistons, but then I noticed that they are made out of 2618 alloy, when most all other brands of N54 pistons (JE, AMP44, etc) are made out of 4032 alloy.
From the little research I’ve done, it sounds like the 2618 is stronger, but expands about 15% more when hot than the 4032 allow, so you need to set up the piston to bore clearance to compensate for that. So instead of the typical .0015” - .0020” piston to cylinder wall clearances used on the 4032 pistons, the 2618 pistons need a larger .0025”-0.035” clearance. When everything is hot and warmed up, the final clearance will be the same regardless of if the pistons are 4032 or 2618. So….my question is, when the larger clearances on the Mahle 2618 pistons…..is that going to cause lots of piston noise on startup? If so, is that enough to cause false knock sensor codes? From what I’ve seen, the Mahle pistons seem pretty popular….and I’ve never heard of anyone having issues with them in the N54 motors, but I thought I would double check. Maybe I’m just overthinking things. I find it stranger that they are on the only company I could find making N54 pistons out of 2618 alloy, when everyone else uses 4032. Any information or feedback would be great!! Thanks 
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2007 335i, BMS DCI, BMS Chargepipe w/Tial BOV, ARM Catless Downpipes, silicone inlets, Bilstein B12 Prokit Suspension, Whiteline subframe bushings, Front/Rear M3 control arms, G-Plus FMIC, Stage 2 LPFP, Custom E40 tune by Justin (V8Bait), xHP stage 3 transmission flash, RB Two Turbos....10.90 @ 128mph
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| 10-31-2023, 10:04 AM | #2 |
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Colonel
 
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Probably have better luck with this question on bmw.spool...
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| 10-31-2023, 10:06 AM | #3 | |
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2007 335i, BMS DCI, BMS Chargepipe w/Tial BOV, ARM Catless Downpipes, silicone inlets, Bilstein B12 Prokit Suspension, Whiteline subframe bushings, Front/Rear M3 control arms, G-Plus FMIC, Stage 2 LPFP, Custom E40 tune by Justin (V8Bait), xHP stage 3 transmission flash, RB Two Turbos....10.90 @ 128mph
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zero2sixtyZ952.50 |
| 10-31-2023, 01:04 PM | #4 |
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You're over thinking this. It's not a BMW specific question. Any reputable engine builder should be able to answer this. It's probably a weight difference between alloys and/or company preference.
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335i, sport pkg, 3 pedals, Blacked out, LED markers, OZ Ultraleggera wheels, Firestone Indy 500s, x-pipe, vibrant 1792, PE mod
MHD stage 2+, BMS DPs, ARM charge pipe, Tial BOV, ARM FMIC, dual cone, CSF radiator, M3 control arms, sways, HAWK pads. https://www.strava.com/athletes/8309149 Follow me on Strava Last edited by Jaronbwall; 10-31-2023 at 01:12 PM.. |
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| 10-31-2023, 01:16 PM | #5 | |
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These N54's are a lot more sensitive to noise that a lot of other motors. Plus...Mahle only makes their N54 pistons in the 2618 alloy, while may of their other pistons are made with 4032.......another reason why it's an N54 question.
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2007 335i, BMS DCI, BMS Chargepipe w/Tial BOV, ARM Catless Downpipes, silicone inlets, Bilstein B12 Prokit Suspension, Whiteline subframe bushings, Front/Rear M3 control arms, G-Plus FMIC, Stage 2 LPFP, Custom E40 tune by Justin (V8Bait), xHP stage 3 transmission flash, RB Two Turbos....10.90 @ 128mph
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| 11-01-2023, 01:09 PM | #6 |
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Ask Billiam.
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| 11-02-2023, 09:29 AM | #7 | |
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2007 335i, BMS DCI, BMS Chargepipe w/Tial BOV, ARM Catless Downpipes, silicone inlets, Bilstein B12 Prokit Suspension, Whiteline subframe bushings, Front/Rear M3 control arms, G-Plus FMIC, Stage 2 LPFP, Custom E40 tune by Justin (V8Bait), xHP stage 3 transmission flash, RB Two Turbos....10.90 @ 128mph
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| 11-02-2023, 11:36 AM | #8 |
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https://www.instagram.com/b_mase_monkey/?hl=en
BMBautowerks..info@BMBautowerks.com Built the motiv engine IIRC, his red coupe made 1k whp, has his own proprietary n54 pistons built to his spec, correctly sized head bolts, has built a bunch of other BMW engines as well. He seems to be the go to guy, even people on facebook seem to agree. Check out his instagram.
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WordOnRoad313.00 |
| 11-07-2023, 12:02 PM | #9 | |
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2007 335i, BMS DCI, BMS Chargepipe w/Tial BOV, ARM Catless Downpipes, silicone inlets, Bilstein B12 Prokit Suspension, Whiteline subframe bushings, Front/Rear M3 control arms, G-Plus FMIC, Stage 2 LPFP, Custom E40 tune by Justin (V8Bait), xHP stage 3 transmission flash, RB Two Turbos....10.90 @ 128mph
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