High Speed Bottom End:
Single cylinder research engines have previously been limited to comparatively low speed operation due to the inherent out-of-balance characteristics of this configuration. This has restricted the correlation of results and data with normal engines running at higher speeds.
MAHLE Powertrain has now developed it’s proprietary, fully balanced, single cylinder bottom-end to further enhance test capabilities. The modular design allows high speed operation at up to 5000 rpm for optical engines and up to 8500 rpm for thermodynamic engines. This enables testing at representative engine speeds and also ensures enhanced accuracy of imaging and measurements during optical testing.
The high speed bottom-end can be configured for use with a wide range of engine types and is successfully utilized for advanced combustion development with both spark ignition and compression ignition cylinder heads. The versatile design allows quick change over of pistons for comparison testing of different compression ratios.
The MAHLE optical single cylinder engine is the ideal tool to investigate the spray and combustion characteristics of various fuels and biofuel blends in detail. Using this research engine, MAHLE Powertrain has conducted comprehensive investigations into Port Fuel Injection (PFI) and Direct Injection (DI) spray development and combustion imaging.