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5.0L 32v - S62B50
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5.0L 32v - S62B50
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Kit of ARP2000 rod bolts replacing the original bolts on the OEM rods of the BMW S62B50 (M5 E39, Z8).
The BMW S62B50 is the naturally aspirated 5.0-litre V8 petrol engine (4,941 cc, 94 mm bore, 89 mm stroke) with 32 valves, fitted to the M5 (E39) and the Z8. Built from 1998 to 2003, it produces 400 hp.
BMW fits the S62B50 with an original connecting rod bolt of reference 11 24 1 405 890 (M10 x 1.25), installed new, washed and oiled each time: the manufacturer specifies tightening to 5 Nm, then 20 Nm, then 65 degrees, which makes the bolt a single-use part.
Few parts of the bottom end work as hard as the rod bolt: at every revolution, it is what stops the cap from pulling away under the inertia loads of the rod and piston assembly. The original bolt is designed for stock power and is single-use.
This kit replaces the original connecting rod bolts of the S62B50 with ARP2000 bolts with an M10 thread. Material: ARP2000, an alloy steel developed by ARP, heat treated to 220,000 psi tensile strength, with threads rolled after heat treatment. Against classes 10.9 and 12.9 of original fasteners, between 150,800 and 176,900 psi minimum, the margin is 24 to 46%. The ARP2000 bolts hold up to 11,750 rpm (calculated estimate).
| Part number | Brand | Grade / material | Head | Thread | Under-head length |
|---|---|---|---|---|---|
| ARP-201-6307 | ARP | ARP2000 | 12-point | M10 | Not published |
Assembly is done with ARP assembly grease, applied to the threads and under the bolt head.
ARP (Automotive Racing Products) came into being in the early 1970s, when Gary Holzapfel, who came from the aerospace industry, decided to tackle the engine failures caused in motorsport by inadequate fasteners. Today the brand produces thousands of part numbers in California for the cylinder head, the main bearings and the connecting rods, in materials suited to each application, with manufacturing known for its consistency.
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| BMW | M5 (E39) | S62B50 | 400 hp | 1998-2003 |
| BMW | Z8 Roadster (E52) | S62B50 | 400 hp | 2000-2003 |
OEM reference (rod bolt): 11 24 1 405 890 (M10 x 1.25)
Tightened by torque then angle, the original rod bolt reaches its yield point and stays stretched for good. Reinforced and therefore stronger, the ARP2000 bolts withstand much higher engine speeds and inertia loads: the risk of a fastener-related failure falls, and with it the risk of an engine repair out of all proportion to the price of the kit.
To complete the bottom-end rebuild, we offer the connecting rod bearings intended for this engine.
| Connecting rod bearings S62B50 (5.0L) → |
Hot forged under considerable pressure, generally from 4340 steel, a forged rod has a denser and more uniform structure than a stock rod. Against the original rod, frequently made of sintered metal and optimised for production cost, it brings about +19% yield strength, +8% tensile strength and +19 to +37% fatigue strength: enough to build a reliable high-power engine on. For your engine:
| Forged rods S62B50 (5.0L) → |
