What is the point of 180 degree headers?

Often termed a 180-degree header, this configuration makes the firing cycle seen by each collector occur 180 degrees apart, improving scavenging as well as low- and midrange torque by permitting a smaller collector outlet diameter than normal for a given combination.

Why do 180 degree headers sound different?

The 180-degree name of the headers does not come from a reference to their shape or layout but rather because the firing pulses of the engine are hitting the collector every 180-degrees.

What is 180 degree firing order?

In an engine with a 180 degree crankshaft, one piston rises as the other falls. In a four-stroke engine, the firing interval is uneven, with the second cylinder firing 180 degrees after the first, followed by a gap of 540 degrees until the first cylinder fires again.

What are headers on a V8?

Headers take the place of your exhaust manifolds, which are the first part of your exhaust system between the cylinder heads and the front exhaust pipes. They are constructed of individual tubes (one for each exhaust port) that meet in a larger tube called a collector.

What is a flat plane crank V8?

But what exactly is a flat-plane crank? It’s all about how the pistons are attached to the crankshaft. A typical V8 uses a cross-plane crank that has the journals that the connecting rods are connected to at 90-degree angles to each other, like a plus sign, while a flat-plane crank puts them at 180-degrees.

What is the difference between a 180 and 360 degree crankshaft?

A 180-degree crank offers the most uneven firing interval: 180 and 540 degrees. The 360-degree crank gives even firing, but as both pistons move together offers the same mechanical balance as a single (i.e. not very good). Again, balance shafts are required.

What is Twin Pulse firing order?

The twin pulse firing order (1 – 0 degrees, 2 – 90 degrees, 3 – 290 degrees, 4 – 380 degrees) resembles the working cycle of a twin cylinder engine and provides the rider-friendly torque delivery which is at its peak from 9000 – 11,750rpm.

Can a car have 180 degree exhaust headers?

Though the use of 180 degree headers is limited to a few mid-engine low-rpm cars, or high-budget builds with custom oil pans and bodywork, you can still maximize your exhaust systems by properly engineering your exhaust manifold for your engine and application.

What should header length be on GT40 replica?

Today, some GT40 replica builders fit NASCAR Sprint Cup-derived engines built by the likes of Roush Yates Engines that make power at 8000 rpm+, dictating a header length closer to 28” or shorter. Running a 180 degree “bundle-of-snakes” header would result in a few ponies left on the dyno room floor.

What makes a bundle of snakes 180 degree header?

The “bundle of snakes” design collects two tubes from each bank into a single 4-1 collector resulting in four evenly spaced exhaust pulses as in the flat-crank header design. A broad power band is inherent to the 180 degree header design due to the smaller collector size.