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3.6L 24v - M96
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3.6L 24v - M96
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ARP2000 rod bolt kit for OEM Porsche 986, 987, 996 and 997 rods.
This kit is for the 24-valve Porsche engines of the M96 family, in 3.4 and 3.6 litres, and for the M97 Turbo of 3.6 litres, which ARP's application list ties to the 986, 987, 996 and 997 models. ARP does not state which engine each model carries or the model years, so that information is not published here.
As soon as the build gets serious, these engines turn higher and for longer; inertia loads on the rods rise with engine speed, and the rod bolts are what hold them. The kit replaces the original bolts with ARP2000 bolts.
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.
The original rod bolts are replaced by ARP2000 bolts with a 12-point head, thread size M9, fitted without a washer. ARP recommends tightening them by measuring their stretch; without a gauge, refer to the torque given in the instruction sheet. These bolts are made from ARP2000, an ARP-specific alloy steel heat treated to 220,000 psi tensile strength, with threads rolled once the treatment is complete. Classes 10.9 and 12.9 of standard fasteners start at 150,800 and 176,900 psi: ARP2000 exceeds them by 24 to 46%. The engine speed allowed by the ARP2000 bolts goes up to 10,250 rpm (calculated estimate).
| Brand | Grade / material | Head | Thread | Under-head length |
|---|---|---|---|---|
| ARP | ARP2000 | 12-point | M9 | Not published |
| Reference | Tightening torque | Stretch |
|---|---|---|
| ARP-204-6301 | 61 Nm | 0.241 - 0.254 mm |
ARP recommends supplementing torque tightening with stretch measurement, which gives a more accurate preload. Torque and stretch figures assume ARP lubricant.
The values above come from the ARP 204-6301 instruction sheet applicable at the date of publication; it is authoritative in the event of any difference. Read the ARP 204-6301 instruction sheet
Assembly is done without thread locker, as the ARP instruction sheet calls for none: ARP Ultra-Torque grease is applied to the threads and under the head of each bolt.
With the stretch gauge, you read directly how much the bolt stretches during tightening: the dial gauge sits on both ends of the fitted bolt, and tightening stops when the stretch reaches the value in the table. Friction no longer comes into play, hence a more consistent preload on a heavily stressed engine.
Torque and stretch figures are only valid with ARP assembly grease, applied to the threads and under the head.
Founded in the early 1970s by Gary Holzapfel, who came from the aerospace sector, ARP (Automotive Racing Products) was born to put an end to fastener-related engine failures in racing. Its thousands of part numbers, designed and manufactured in California for the cylinder head, the main bearings and the connecting rods, come in several materials depending on the application and are recognised for the consistency of their manufacture.
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| Porsche | 986, 987, 996 and 997 (ARP list) | M96 3.4 L 24-valve | Not published | Not published |
| Porsche | 986, 987, 996 and 997 (ARP list) | M96 3.6 L 24-valve | Not published | Not published |
| Porsche | 986, 987, 996 and 997 (ARP list) | M97 Turbo 3.6 L 24-valve | Not published | Not published |
On a Porsche engine of this family, a rod bolt that gives way takes the rod, the piston and part of the bottom end with it. ARP2000 bolts withstand higher engine speeds and inertia loads than the original bolts and lower that risk, at a cost far below that of rebuilding the bottom end.
