Search Results

Gasket sealing performance of a manifold is traditionally characterized either by pressure distribution on flange face or line loads on gasket beads. These readings are sometimes susceptible to error due to complex contact algorithms or lack of reliable gasket data. In addition, they are difficult to correlate, particularly in the case of log-type manifolds. Here, a different approach for assessing gasket sealing performance of exhaust manifolds is presented based on overall manifold distortion under thermo-mechanical loading. Current technical paper describes the methodology used and presents a validation work.

In order to increase engine capacity of close-deck single-bore type engine blocks, bore diameter is usually enlarged that results in thinner intra-bore sections. Enlarged intra-bore sections affect thermal loads around the cylinders as well as manufacturing complexities due to thinner water jacket cores. As a possible remedy, intrabore cores can be removed and passages can be created in the intrabore region by multiple drills. However, it should be ensured that sufficient heat transfer from ring reversal area is possible and effect on bore distortion is acceptable. The second item is particularly important considering the recent trends due to its effect on exhaust emissions, fuel and oil consumption. The effect of intra-bore drilling of a diesel Vee-engine block on thermal loading, assembly / hot bore distortion are assessed during the course of this study. For assembly loading condition, intra-bore drilling has little effect on bore distortion.