(08 Oct 2017, 1:29 pm)Andreos1 wrote That said, a problem with the current crop of hybrids is that they are "probably over-engined", says Saint. He believes there is a gap in the market for a new family of engines designed with hybrids in mind. "Once you get below 4.5 litres, engines are designed for smaller LCVs and their duty cycles. Designs are unsuitable for hybrid buses. Some operators have found, to their peril, the problems with putting a small engine in a hybrid. It won't work, because it won't stand the bus' duty cycle."
source: http://www.transportengineer.org.uk/tran...tart/52720
A good read.
Remember the disastrous gas-turbine engines in the first QuayLink buses?