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Eibach, page 1

Eibach, page 3

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Eibach Springs, Page 2

The Company

In 1951, Heinrich Eibach founded a small production shop in Finnentrop, Germany that has grown over the years into a leading manufacturer of advanced suspension components. Eibach is an original equipment supplier to Ferrari, BMW, Volkswagen, Ford, and other auto manufacturers. Racing customers include Alfa Romeo, AMG, BMW Motorsports, Ferrari, Ford, and Lola. Eibach products appear on race cars all over the world competing in Formula One, Indy Racing League, CART, Sports Car, NASCAR, German Touring Car, GT Cup, off-road racing, and Sports Car Club of America professional and club racing. Eibach also supplies replacement springs and engineered suspension kits to people wanting to modify their road cars for a distinctive look and/or improved handling.

Entrance to Eibach's Irvine facility

Eibach has manufacturing facilities in Germany, Japan, England, and the United States. Their U.S. plant is in Irvine, Calif. just south of Los Angeles. This facility houses manufacturing, engineering, and sales in a building of 50,000 square feet. Another building nearby provides 15,000 square feet of warehouse space. Monthly spring production in Irvine is 30,000 to 40,000 units.

Making Springs the Eibach Way

Rolls of precision-drawn wire

The process starts with the best material for the product, precision-drawn wire.Most Eibach racing springs are made from a steel high in chromium and silicon which is slightly more fatigue resistant. For a product that is subject to cyclical stresses as is a spring the fatigue strength of the steel is the most important characteristic.

Eibach stocks precision wire in small increments of diameter so their designs can be optimized, allowing the lightest spring for the customer's needs. Chrome-Silicon wire is stocked in 1/4 mm (0.010 in.) increments in diameters above 9 mm. Below 9mm the increment in diameter is 1/10 mm (0.004 in.).

Mandrel-wound coil springs

Some springs such as those specified by NASCAR rules are made of large-diameter chromium-vanadium steel wire and are cold wound over a mandrel as in the photo above.

Automatic Winding Machine

Automatic windingt machine

This is a computer-controlled coil winding machine that is very impressive to see in action. Wire comes into the machine from the left and the new coil spring seems to grow out of the hydraulically-controlled tools. The following three photos show the machine producing a barrel-shaped spring.

Automatic col winding, start

Automatic coil winding, middle

Automatic coil winding, end

That's a powerful chisle at the middle top of the photo which cuts the finished spring from the wire stock.

Operators adjust the machine

Machine operators check parts coming off the machine as they adjust the tooling for a run of barrel-shaped coil springs.

Eibach engineers decided years ago that hot-forming springs causes hydrogen embrittlement and reduces fatigue strength, so all Eibach springs are cold-formed. This extremely robust, computer-controlled winding machine uses wire at a rate of 180 ft/min. producing roughly 400 parts per hour.

Heat-trear oven

After cold-forming, the springs go into this oven for a heat treatment process that increases strength and fatigue resistance.

Eibach Springs, page 3


 The contents of this web site are copyrighted by Paul Haney. No reproduction other than for your own personal use unless full source attribution is quoted. All Rights reserved by Paul Haney, 1999.