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- W4362722105 abstract "<div class=section abstract><div class=htmlview paragraph>In comparison to aluminum, Compacted Graphite Iron (CGI) iron has superior mechanical properties, enables the use of parent bore running surfaces and fracture split main bearings, and provides advantageous NVH, package size, cost, and manufacturing CO<sub>2</sub> profiles. Despite these advantages, aluminum blocks have leveraged density, and therefore weight, differentials to make considerable gains in the small, in-line passenger vehicle sector over the last 30 years.</div><div class=htmlview paragraph>In order to demonstrate the potential benefits of CGI for small, in-line spark-ignition engines, the present study converted the cylinder block of a series production 1.2 litre three-cylinder engine from aluminum to CGI. Leveraging a novel design concept, with the running surface and load path constructed from high-strength CGI and the outer crankcase housing fabricated from durable, lightweight plastic, the assembled cylinder block achieved the same weight as the original aluminum block.</div><div class=htmlview paragraph>NVH analyses showed that the global flexural modes of the CGI cylinder block were 5% higher than aluminum block while the four main bearing cap modes were 18~40% higher, indicating potential NVH advantages for the CGI engine. It is further noted that the design of the CGI cylinder block was constrained by the need to maintain outer dimensions and bore-centers to facilitate engine assembly for durability testing. It is estimated that a clean-sheet design could have enabled a further 5% reduction in the weight of the CGI block.</div><div class=htmlview paragraph>With weight parity, and the successful completion of a 100-hour durability test, CGI has established a new benchmark for small, in-line passenger vehicle engines.</div></div>" @default.
- W4362722105 created "2023-04-09" @default.
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- W4362722105 date "2023-04-11" @default.
- W4362722105 modified "2023-10-18" @default.
- W4362722105 title "Cast Iron Cylinder Blocks: Same Weight as Aluminum; Lower Emissions" @default.
- W4362722105 doi "https://doi.org/10.4271/2023-01-0439" @default.
- W4362722105 hasPublicationYear "2023" @default.
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