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Tighten connecting rods correctly
How to install ARP connecting rod bolts
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The complete guide to installing your con rods
Con rods are without doubt the last thing you would want flying around the place when you step on the gas. But the con rod bolts have to withstand huge forces, which is why correct installation is really vital. Here you’ll find a complete guide to fitting the con rod bolts, and a table showing the correct stretch of each bolt.
It’s a good idea to have the following equipment to hand:
- Brake cleaner
- ARP Assembly Lubricant
- Ratchet or electric screwdriver
- Dial gauge for connecting rod bolts
How to install ARP connecting rod bolts
- Disassemble and clean the rods (including bolt and beam threads) to remove rust preventative.
- Apply ARP Molylube to the threads and under the head of each bolt.
- Assamble the rod to the piston. The rod bearing notches must show to the intake of the engine, due to rotation direction of the crankshaft!
- Install rods by bringing cap and beam into alignment. Tap into place before installing bolts (DO NOT USE BOLTS TO PULL CAPS INTO POSITION) Each rod is numbered and MUST be assembled with the same number on cap and beam.
Rod torque specs
1 ft./lb. approximates 1,356 Nm
| Type | Size Inch | Size metrich | Stretch Inch | Stretch mm |
|---|---|---|---|---|
| ARP 2000 | 5/16" x 1.500" | 7,9mm x 38,1mm | 0.0056" | 0.14224mm |
| ARP 8740 | 3/8" x 1.600" | 9,5mm x 40,64mm | 0.0047" | 0.11938mm |
| ARP 2000 | 3/8" x 1.600" | 9,5mm x 40,64mm | 0.0058" | 0.14732mm |
| ARP 8740 Wave Loc Bolt & Nut | 3/8" | 9,5mm | 0.0063" | 0.16002mm |
| ARP 8740 | 7/16" x 1.400" | 11,1mm x 35,56mm | 0.0046" | 0.11684mm |
| SCAT 2001 | 7/16" x 1.500" | 11,1mm x 38,1mm | ||
| ARP 8740 | 7/16" x 1.600" | 11,1mm x 40,64mm | 0.005" | 0.127mm |
| ARP 2000 | 7/16" x 1.600" | 11,1m x 40,64mm | 0.0062" | 0.15748mm |
| ARP 8740 | 7/16" x 1.800" | 11,1mm x 45,72mm | 0.006" | 0.1524mm |
| SCAT 2000 | 7/16" x 1.800" | 11,1mm x 45,72mm |
All statements without guarantee. All rights reserved.
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His first car was a Polo Mk1 with a 40 Weber twin carburetor and 129 PS (95 kW). His second was an Audi 50. Today Bartek tunes Lamborghinis to 1000 PS (735 kW). Even as a young boy, Bartek disassembled vehicles and put everything back together better. He wrote his high school diploma with oil on his fingers. The trained automotive mechanic with a focus on engines and gearboxes was determined to go into motorsports. In his 10 years in Formal 1, he supervised 73 races, including as engine mechanic for Ralf Schumacher at Toyota. Since 2010, he has dedicated himself fully to his company BAR-TEK® and helps his customers to bring VW and Audi engines to peak performance.
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