Over the past few years, plastic Intake Manifolds have gradually started to replace cast aluminum. Due to the fact that the plastic intake must be bolted / fastened to the engine, the use of a Compression Limiter is required to prevent the plastic manifold from cracking during assembly.
One customer originally designed a 6mm x 65mm brass bushing to be used in this specific application. There were no potential issues with the design of the brass bushing. However, the customer was familiar with SPIROL's roll-formed steel Compression Limiters and, with the intent of reducing production costs, decided to pursue this alternative. SPIROL had reviewed several different manifold applications and did recommend a steel roll-formed Compression Limiter as the lowest installed cost component.