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2. Harley-Davidson Shovelhead engine - Wikipedia

   en.wikipedia.org/wiki/Harley-Davidson_Shovelhead...

   The Shovelhead engine is a motorcycle engine that was produced by Harley-Davidson from 1966 to 1984, built as a successor to the previous Panhead engine. When the engine was first produced, the Shovelhead had a shallower combustion chamber, larger valve drop for both intake and exhaust, better porting, and stronger valves and pistons.

3. Expansion chamber - Wikipedia

   en.wikipedia.org/wiki/Expansion_chamber

   The vacuum wave arrives in the cylinder during the transfer cycle and helps suck in fresh mixture from the crankcase into the cylinder, and/or prevent the suction of exhaust gases into the crankcase (due to crankcase vacuum). [3] However, the wave may also suck fresh mixture out the exhaust port into the header of the expansion chamber.

4. Harley-Davidson Evolution engine - Wikipedia

   en.wikipedia.org/wiki/Harley-Davidson_Evolution...

   Harley-Davidson Evolution engine at the Harley-Davidson Museum. The Evolution engine (popularly known as Evo and sometimes as Blockhead ) is an air-cooled, 45-degree, V-twin engine manufactured from 1984 by Harley-Davidson for the company's motorcycles.

5. Whistle tip - Wikipedia

   en.wikipedia.org/wiki/Whistle_tip

   Whistle tips, also referred to as whistler tips, or whistlers, are modified vehicle exhaust pipes that generate a whistling sound during the operation of a motor vehicle that can often be heard up to a mile away. [1] The whistle tip is a small metal plate with a central hole that is welded into the inner tip of the exhaust pipe.

6. Tuned exhaust - Wikipedia

   en.wikipedia.org/wiki/Tuned_exhaust

   A 4-2-1 exhaust system is a type of exhaust manifold for an engine with four cylinders per bank, such as an inline-four engine or a V8 engine. The layout of a 4-2-1 system is as follows: four pipes (primary) come off the cylinder head , and merge into two pipes (secondary), which in turn finally link up to form one collector pipe.

7. Scavenging (engine) - Wikipedia

   en.wikipedia.org/wiki/Scavenging_(engine)

   Scavenging is the process of replacing the exhaust gas in a cylinder of an internal combustion engine with the fresh air–fuel mixture (or fresh air, in the case of direct-injection engines) for the next cycle. If scavenging is incomplete, the remaining exhaust gases can cause improper combustion for the next cycle, leading to reduced power ...