Dry Sump Motorcycle Engines
The advantages (above) of a dry sump lubrication are particularly beneficial to motorcycles, which tend to be ridden (driven) more vigorously than other road vehicles. The classic British parallel twin motorcycles such as BSA, Triumph and Norton all used dry sump lubrication. Traditionally, the oil tank was a remote item, but some late-model BSAs and the Meriden Triumphs used "oil-in-the-frame" designs. Although the ground-breaking Honda CB750 of 1969 had a dry-sump motor, modern motorcycles tend to use a wet-sump design. This is understandable with across-the-frame inline four-cylinder engines, since these wide motors need to be mounted fairly high in the frame (for ground clearance), so the space beneath the engine may as well be used for a wet sump. But narrower engines can be mounted lower and ideally should use dry sump lubrication.
It is notable that the Yamaha TRX850 270-degree parallel twin motorcycle has a dry sump engine. The TRX has an unusual feature in that the oil tank is not remote, but is integral to the engine, sitting atop the gearbox. This design eradicates external oil lines, allowing simpler engine removal and providing faster oil warm up.
Harley-Davidson has also used dry sump type lubricating oil systems in their engines since the 1930s.
The Rotax engined Aprilia RSV Mille and the Aprilia RST1000 Futura both utilise a dry sump.
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