What causes engine crackle?

When an engine is running rich, it has too much fuel and too little air, which slows down the combustion process. When combustion doesn’t happen in a timely manner, the exhaust valve opens while the air-fuel mixture is still igniting, causing this explosion to “spill” out of the cylinder, making a loud popping noise.

Are crackle tunes bad for engine?

Some of these pop and bang tunes also have the spark plugs fire as the fuel is leaving the cylinder through the exhaust ports by massively retarding (delaying) the ignition timing. This can result in the burning of your exhaust valves, which can either cause them to no longer seal properly or damage them permanently.

What is crackle overrun?

Overrun Crackles – Pop and Bang Tuning Pops and Bangs, or Crackles as the OEM call it (yes, it’s that common on production cars that even the manufacturers have a name for it!), is simply a calibration feature within the ECU where we set up a specifically targeted, very lean misfire once you lift off the throttle.

What is a Decat?

A Decat / De-Cat or Decat Pipe is simply a straight piece of tube that is used to replace a catalytic converter. Modern engines have a sensor positioned after the catalytic converter which sends information back to the ECU instructing the ECU how to control the fuel/air mixture.

What causes cracking and popping exhaust?

If your engine is getting more fuel than it needs, a rich fuel to air ratio is the result. When your car has leftover fuel in the exhaust and the cylinders, that fuel explosively burns and creates a loud popping sound.

What is the point of a crackle tune?

a Crackle and pop tune is simply an adjustment to specific ignition timing, fueling and other ECU parameters in order to achieve the desired effect. Crackles and pops are created when an explosion occurs outside the combustion chamber in the exhaust system.

Is a burble tune bad for the engine?

A: Anything can hurt your engine if used excessively, too much usage / abuse of Burble Tune or Pop and Bang can cause damage to CAT (Catalistyc Converter) or to exhaust manifold or Turbo (Depends on Application), if used Burble mod gentle there is nothing to worry about (as long as it is done professionals like us) if …

Is it illegal to Decat?

Its not illegal by law to have a decat. The people who set rules about emissions are the DVLA, not the police. The police don’t do anything about decats unless they are accompanied by a vosa emissions officer, who is authorised to test the car.

How much BHP does a Decat give?

It’ll give prolly about a 2bhp gain, depending on how the engine is etc etc.

Why do turbo engines pop?

Generally speaking, turbocharged cars can also create these sounds. The popping noises occur when ignition is retarded and unburnt fuel is sent into the exhaust system, where it combusts.

What is a burble in an engine?

The burble is in actual fact a series of lean misfirings caused by this timing which rumble out through the exhaust system. It causes no serious damage to the engine, and soon disappears once the vehicle has reached high speeds.

Why does my car burble at low RPMs?

This means that, while the engine timing will work well at much higher RPM, the combustion process at lower speeds is slightly off. The burble is in actual fact a series of lean misfirings caused by this timing which rumble out through the exhaust system.

Why do race cars pop and Bang on the overrun?

Cringeworthy and so Chav Council. Race cars used to pop and bang on the overrun because they used carburetors, or crude injection systems, and camshafts with a big overlap, so there was always some unburnt fuel in the exhaust.

How do you fix an exhaust burble on acceleration?

For an exhaust burble on acceleration, the engine must undergo a professional tune-up including resetting the timing mechanism and lifters; keep in mind this will decrease high speed engine performance, but increase the quality of performance at low speeds.