MED STEEL CONRODS - 6.000" LENGTH - 18MM PIN - 'S' 1.625" ENDS

Name: MED STEEL CONRODS - 6.000" LENGTH - 18MM PIN - 'S' 1.625" ENDS
Brand: MED Engineering
SKU: MED-1275-CR-618
Price: 1125.0 GBP
Availability: InStock

Part No: MED-1275-CR-618

£1,125.00 £937.50 EXC VAT

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Product variants

Availability: In Stock

Description

The MED steel conrods are one of the lightest and strongest ever designed for the 1275 A-Series engine, weighing just 435g including the bolts. Long 6-inch length for use with short height pistons.

Longer rods alter the basic geometry of the rotating assembly to improve performance. Running a shorter compression height piston then offsets the minimal weight gain of the longer conrod.

Our 6-inch conrods only weigh 5g more than our 5.750" design!

Conrod features

18mm little end bush for Omega forged lightweight pistons

1.625" Cooper S size big end journals

6.000" length, for short height pistons

Fully machined

Uniform machine peening

Balanced end-to-end within a gram

Laser-etched MED logo

Fitted with ARP fasteners

Please see the FAQs below for more detail and recommendations.

Supplied as an engine set of four.

Frequently Asked Questions

What makes these better than standard conrods?

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.

Which pistons will these work with?

This set features a bushed little end to accept fully-floating gudgeon pins in the lightweight 18mm design. They are an ideal match for our competition-grade Omega forged pistons with 18mm pins and shorter 1.248" compression height. This retains the same overall stroke length as standard; with regular 1.498" height pistons, the crowns would protrude too far from the top of the block.

Will these work with all 1275 A-Series crankshafts?

These specific conrods feature 1.625-inch big ends to suit 1275 Cooper S, MG Midget or MED steel billet crankshafts. These do not suit 1275 GT or A+ crankshafts with the 1.750-inch big ends.

What torque setting should be used on the bolts?

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 3/8" socket/spanner to do this.

Am I better with 6.000" conrods or 5.750"?

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.