|
- 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 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
- 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
- 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
- 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
- Advancing Retarding a Camshaft · Help Center
A Basic Overview of Cam Timing To advance or retard a camshaft is to change the alignment between the camshaft and the crankshaft When a cam is installed "straight-up," the imaginary centerlines of the two shafts line up exactly Advancing or retarding the cam pushes the centerline of the camshaft to one side or the other of the crankshaft centerline This changes the Timing of the valve
- Should I wrap my headers? · Help Center - Summit Racing
This improves exhaust flow and The Scavenging Effect It also lowers underhood temps Wrapped headers will make a little more Torque and Horsepower than a bare metal set Despite improving performance, wrapped headers have a few weaknesses First, because the heat is retained inside the wrap, the metal gets much hotter than painted or coated
|
|
|