31-12-2020, 01:36 AM
Hi Tony
The 1937 head is the classical Ricardo patent layout. When octane was very low it enabled a cr increase and prolonged the use of sv engines which, with long combustion paths were otherwise very limited to cr and hence efficency. Ricardo took action against makes who adopted it early. The existance of another with specifically that name is confusing, esp when, apart from a squish area, it seems not to comply with the Riacardo norm.! .
The 1937 head is the classical Ricardo patent layout. When octane was very low it enabled a cr increase and prolonged the use of sv engines which, with long combustion paths were otherwise very limited to cr and hence efficency. Ricardo took action against makes who adopted it early. The existance of another with specifically that name is confusing, esp when, apart from a squish area, it seems not to comply with the Riacardo norm.! .