98 mm bore
98 mm bore
(OP)
Can anyone explain why so many engines use a 98mm bore. As far backs the 1920s this bore appeared in a Vauxhall 4.2 litre 4 cylinder petrol engine, (designed by Laurence Pomeroy). The same dimensions are used in many current 4 cylinder diesel engines fitted to Fiat, Ford, Fendt, International and Perkins engines





RE: 98 mm bore
I.e., availability of existing tooling may tend to cluster numbers that might otherwise be random.
Mike Halloran
Pembroke Pines, FL, USA
RE: 98 mm bore
RE: 98 mm bore
je suis charlie
RE: 98 mm bore
RE: 98 mm bore
RE: 98 mm bore
In fact, if you look at the range of engines produced by Detroit Diesel over the years, the model number (series 50, series 92, series 60, etc.) referred to the displacement of each cylinder in cubic inches. And the engines of each series all used a common bore size. With DI diesels, the combustion chamber is in the piston crown. And the size and shape of the chamber, and its relation with the injector nozzle, is critical.