Intercooling Improves Output and Efficiency
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IERFORMANCE curves released by The Birmingham Small Arms Co., 1., Birmingham, 11, show that cornring the operations of a turbocharger intercooler increases the maximum tput of a 9.6-litre engine from 140 ..p. to 250 b.h.p. at the peak speed of 00 r.p.m. The intercooler is of the to-air type, which is particularly suite for applications to vehicle engines. )ther performance details show that maximum b.m.e.p. is increased from tut 109 p.s.i. to 200 p.s.i. at 1,200 r.p.m. Above 1,200 r.p.m. the use of the turbocharger and intercooler reduces the specific fuel consumption of the engine, the gain in economy increasing from this speed up to the maximum rated r.p.m.
At .2,000 r.p.m. the turbocharged unit operates at a consumption rate of less than 0.19 lb./b h.p.-hr., whilst the consumption of the normally aspirated engine
is about 07415 lb./b.h.p.-hr. Optimum consumption provided by the turbocharged engine is 0.365 lb./b.h.p.-hr. at 1,300 r.p.m. Believed to be the first available performance figures showing the advantage of intercooling an automotive-type engine, data supplied by the company show that at speeds between 800 and 1,600 r.p.m. the unit gives an increase in b.m.e.p. of around 30 per cent., the maximum improvement being obtained at 1,100 r.p.m. A turbocharged engine operating without an intercooler develops a b.m.e.p. of about 166 p.s.i. at this speed. and the intercooled engine has a b.m.e.p. output of approximately 207 p.s.i.