![]() ![]() The original R-975 (or J-6-9) was rated for 300 hp (224 kW), while the R-975E of 1931 could do 330 hp (246 kW) thanks to an improved cylinder head design. Wright gradually developed the R-975, at first using suffix letters to indicate successive versions. While the R-790 was naturally aspirated, the R-975, like the other J-6 engines, had a gear-driven supercharger to boost its power output. The piston stroke of 5.5 in (14.0 cm) was unchanged, but the cylinder bore was expanded to 5.0 in (12.7 cm) from the R-790's bore of 4.5 in (11.4 cm). Like all the members of the J-6 Whirlwind family, the R-975 had larger cylinders than the R-790. government designated it as the R-975 Wright later adopted this and dropped the J-6 nomenclature. ![]() The nine-cylinder version was originally known as the J-6 Whirlwind Nine, or J-6-9 for short. ![]() The J-6 family included varieties with five, seven, and nine cylinders. Wright introduced the J-6 Whirlwind family in 1928 to replace the nine-cylinder R-790 series. ![]()
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