MED STEEL CONRODS - STD LENGTH - 18MM PIN - 'S' 1.625 ENDS

These are fully machined from double air re-melted 817M40 forgings. All rods are shot peened using an automated process to increase fatigue strength and durability. The rods are balanced end-over-end into matched engine sets and are 100% magnaflux crack detected prior to final inspection by CMM in a temperature controlled inspection department. As part of the design process, Arrow Precision worked closely with ARP to select the best available fasteners.

There's three benefits - strength, light weight and high quality. H-section steel conrods are considerably stronger than mass-produced standard conrods, which were never designed for high performance applications. Standard conrods can be lightened and balanced, but even then our steel conrods will be lighter and stronger. The highly accurate production process allows for exact build tolerances; you will not find a higher quality A-Series conrod.

This set features a bushed little end to accept fully-floating gudgeon pins in the lightweight 18mm design. They are an ideal match for any of our competition-grade Omega forged pistons with 18mm pins. These would usually work best with the standard 1.498" compression height pistons to retain the overall stroke length, however there are occasions where a shorter piston can be useful. Please contact us if you're unsure.

All MED conrods feature 1.625-inch big ends to suit 1275 Cooper S, MG Midget or MED steel billet crankshafts. We do not produce conrods for the larger diameter 1.750-inch big ends, as the extra weight here does not lend itself to full competition usage.

These should be torqued to 30lb.ft, or preferably checked using an ARP rod bolt stretch gauge and stretched to 0.0050"-0.0055". You will need a 12-point 9mm socket/spanner to do this.

This is the length from the centre of the big end journal to the centre of the little end journal. As standard on a 1275cc A-Series this is 5.750". Changing to a longer conrod and shorter piston will maintain the same overall length, but offer a reduction in friction in the engine and give a marginally longer piston dwell time at TDC. Overall this is considered a performance improvement, but it's only useful if the race regulations allow a non-standard rod length.

Yes the MED steel conrods allow good clearance of the camshaft on an Arden 8-port engine.