The forged crankshafts from CIE Automotive S.A. - a quiet workhorse for long-running engines

Reviewed: ad hoc news Classics & Longseller desk. Edited and checked on 2026-06-28, 08:44. Details in the imprint.

The forged crankshafts from CIE Automotive S.A. live where drivers never look, buried in the oily heart of the engine, turning every press of the accelerator into rotation. You do not see them, but you feel their work as the revs climb without drama. In fleets that run all day, these parts are the invisible backbone.

What this crankshaft does

At its core, the forged crankshaft converts the linear movement of the pistons into rotational power that drives the gearbox and ultimately the wheels. Every ignition cycle sends a shock through the journals and counterweights. Over hundreds of thousands of kilometres, strength and dimensional stability decide whether an engine stays smooth or starts to complain.

CIE Automotive designs these crankshafts for high-cycle fatigue in demanding duty cycles, from passenger cars to light commercial vehicles. The steel alloy composition, grain flow from forging and heat treatment regimen are tuned so that micro-cracks do not propagate under repeated bending and torsion loads. The company sells them as part of long-term supply programmes to major OEMs that depend on predictable durability.

How it is made and feels in use

Production starts with steel billets that are heated and pressed in massive forging lines, giving the crankshaft its rough shape before machining. Forging aligns the grain of the metal along the main load paths, which increases resistance to bending compared with cast designs. Machining then brings bearing surfaces and oil passages into tight tolerance windows so that the crank runs without noticeable vibration when coupled to balanced pistons.

A mechanic who has installed a CIE Automotive crankshaft in a long-haul van describes the result as "a clean idle, with the steering wheel barely trembling even at cold start" and notes the quiet, even hum when the engine settles at 2,000 rpm on the motorway. That tactile calm translates into less driver fatigue and lower perceived noise, even though the part itself never shows up in a brochure.

Why OEMs keep ordering it

For vehicle manufacturers, a crankshaft is not a marketing tool but a risk factor in warranty statistics. When a supplier delivers a design that holds up in millions of engines, the safest move is often to lock that part into multiple platforms. CIE Automotive has built relationships where its forged units appear in successive generations of powertrains, forming an unassuming but strategic longseller in its catalogue.

In practice, that means a design that may have started in a compact car finds its way, with minor adjustments, into crossovers and light commercial vans. Tooling, test data and production know-how are amortised over a broad base. For CIE Automotive, each crankshaft becomes one line in a multi-year framework contract, but together they represent a significant recurring revenue stream that does not depend on short-term consumer fashion.

Where it sits in CIE Automotive S.A.

President and CEO Antón Pradera has often stressed in interviews that the group focuses on "high-value-added components" as its core. The forged crankshaft fits neatly into that narrative: it requires capital-intensive forging presses, metallurgical expertise and tight quality control. It also binds the company to OEM product timelines, which can stretch across a decade, anchoring visibility for investors.

Within the broader portfolio of components like engine blocks, transmission parts and chassis elements, the crankshaft is one of the classic mechanical heroes. It has not changed its basic function in more than a century, yet its design keeps evolving with lighter materials and stricter emissions rules. CIE Automotive uses these steady, engineered parts to balance more cyclical business lines exposed to model launches or regional demand swings.

Layer C - company and shares

All told, the forged crankshafts from CIE Automotive S.A. show how a discreet piece of steel can underpin engine feel, warranty statistics and long-term OEM supply ties at the same time. CIE Automotive S.A. shares (ISIN ES0105630315) are listed on the Spanish market in Madrid, providing investors with access to this component-driven business model.

This article was AI-assisted and editorially reviewed. Product information without guarantee; prices and availability may change at short notice. No investment advice, no buy or sell recommendation. Stock-market transactions involve risks up to total loss.

en | ES0105630315 | CIE AUTOMOTIVE | boerse | 69644420 | bgmi