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- The Scavenging Effect · Help Center - Summit Racing
The Scavenging Effect Definition and Description Scavenging occurs when the rush of exhaust gas leaving the cylinder helps to pull in more fresh air (and fuel) How does it work? During the exhaust stroke, the exhaust gases escape the cylinder very quickly This creates a high-speed pulse of exhaust flowing down the Header Primary Tube
- Exhaust Runner Volume · Help Center
Tuning runner length to promote Exhaust Scavenging Tuning runner diameter to maintain flow velocity without restricting flow volume Exhaust runner volume is far less important than the Intake Runner Volume Other factors, like the Header Primary Tubes, will have a much bigger impact on exhaust flow than the runner volume in the head
- The Header Collector · Help Center
Scavenging is created by maintaining the speed of exhaust flow When the high-speed pulse of exhaust from the primary tube reaches the larger collector, it slows down
- Exhaust Reversion · Help Center
Definition and Description Reversion happens when exhaust gases flow backwards and contaminate the intake charge (It is the opposite of The Scavenging Effect ) What causes it? Backpressure in the exhaust system causes reversion It gets worse with excessive Valve Overlap and improper Valve Timing Performance camshafts take advantage of scavenging at high rpm If the exhaust system is too
- What is valve overlap? · Help Center
At high rpm, overlap takes advantage of the Scavenging Effect However, at idle and low rpm, overlap will produce low Engine Vacuum and a rough idle This is great for a race car, but not so much for other vehicles Any camshaft with a significant amount of overlap is not recommended for street-driven cars The engine will have poor low-end power
- What are the Four Strokes of an Engine? · Help Center
A Basic Overview A single stroke in an engine refers to the piston traveling the full sweep of the cylinder There are 4 strokes in an engine's cycle They are Intake, Compression, Power, and Exhaust One cycle is actually 2 complete rotations of the crankshaft The Intake Stroke The piston starts at Top Dead Center (TDC) As it travels down the cylinder, the intake valve opens The air fuel
- How do valve timing events affect engine performance?
Valve Timing Events Explained Knowing what Valve Timing Events are and how they affect performance will help you understand what to expect from your cam Valve timing events set Duration, Lobe Separation, Advance, and Overlap Exhaust Valve Opening (EVO) EVO controls the evacuation of combustion gasses This is also known as blowdown Most blowdown occurs before BDC because of residual
- How do I choose a set of headers? · Help Center
The pulses of exhaust gases in the primaries also create a Scavenging Effect in the cylinder This improves airflow through the engine and can free up plenty of ponies! Before buying a set of headers, it will help to understand the available options Having a basic understanding will get you the right headers for your specific application
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