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Can you run a 2 stroke without a silencer?

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Asked By: Isidor Gittelmacher | Last Updated: 25th April, 2020
2strokes run fine without mufflers, if your muffler pipe is an expansion chamber you might notice a low to medium power loss, but you should be fine.





Then, can you straight pipe a 2 stroke?

The right length pipe can actually help a two stroke. Yes you can run a straight pipe. In reality the majority of mufflers used on aero gas two strokes are not all that much different in performance than a straight pipe.

Also, is it bad to run a motorcycle without muffler? Without the muffler, the bike will probably run lean. Too lean and all sorts of serious damage can result. The best overall solution is to put the can back on avoid further reckless experimentation.

One may also ask, does a 2 stroke need back pressure?

In a piston-ported twostroke engine, however, the situation is more complicated, due to the need to prevent unburned fuel/air mixture from passing right through the cylinders into the exhaust. The exhaust port opens while there is still significant pressure in the cylinder, which drives the initial outflow of exhaust.

Is it bad to run straight pipe on a motorcycle?

straight pipes arent that good for a bike, because when you let off the throttle, the sudden lack of hot gases being pushed out can cause cold air to be sucked in, which can damage your exhaust valves, and make for a VERY pricey repair.

Why do 2 strokes have expansion chambers?

Simply put, it’s because the two-stroke exhaust system, commonly referred to as an ‘expansion chamber‘ uses pressure waves emanating from the combustion chamber to effectively supercharge your cylinder. An engine’s exhaust port can be thought of as a sound generator.

Why are 2 strokes so loud?

There are two major reasons: Most loud 2 strokes are air cooled and air cooled engines lack the sound dampening created by the water jacket. Because 2 strokes don’t have a dedicated exhaust cycle, their exhaust pipes need to be very free flowing in order to clear the cylinder in the short amount of time available.

Will no back pressure hurt my engine?

Engine Exhaust Back Pressure. Abstract: Exhaust system components such as mufflers and exhaust aftertreatment devices are a source of engine exhaust back pressure. Increased back pressure levels can cause increased emissions, increased fuel consumption, and can negatively affect engine performance.

Why are 2 strokes more powerful?

Typically, a 2stroke engine creates more torque at a higher RPM, while a 4-stroke engine creates a higher torque at a lower RPM. That being said, 2stroke engines are more powerful. Twostroke engines are a much simpler design, making them easier to fix. They do not have valves, but rather ports.

How do I calculate back pressure on my exhaust?

You will need the velocity of flow in the pipe to substituted in the above link.
  1. Mass flow rate of Exhaust gases = <mass flow rate of air> + <mass flow rate of fuel> From that Calculate Volume Flow rate of Exhaust gases (Q) and then use the formulae.
  2. Result:
  3. Back Pressure = Atmospheric Pressure + Pressure Drop.

Do you need back pressure in an exhaust?

However, a little back pressure is a good thing. In fact, it helps. The right size pipe is large enough to breathe well but small enough to create a high exhaust flow. Steps in the exhaust system also create negative pressure waves that travel back to the cylinder and help empty the cylinder of those gases.

How do you check exhaust back pressure?

To measure exhaust backpressure, you need a pressure gauge with a scale that reads zero to 15 psi, or zero to 100 kPa or higher (note: 1 psi equals 6.89 kPa, and 1 kPa equals 0.145 psi). If you don’t have a low pressure gauge, you can buy a basic exhaust backpressure test kit for around $60.

Does back pressure increase torque?

Back pressure affects torque because it gives us an idea of velocity in the exhaust tubing. Basically a higher velocity (to a point) will have a higher momentum out of the exhaust system. At the head port this high velocity will help pull fresh intake charge in during the overlap period.

What is back pressure in condenser?

High Condenser Pressure

Turbine exhaust back pressure is directly related to lost power output to the generator that converts mechanical energy to electrical power. Excess back pressure means reduced efficiency and dollars wasted.

What is back pressure valve?

A back pressure valve is a type of control valve that holds pressure on production vessels such as separators, treaters, and free water knockouts and releases upstream pressure when a designated set point is reached.

Do you need to tune your bike after exhaust?

Full system, yes you need to re-jet for carb’ed engines, or a power commander or similar for FI engines. If you get a full system specifically designed and tuned to your bike however, it should bolt straight on without issue, if the manufacturer of the exhaust has done their job properly.

Does slip on exhaust damage engine?

No, it will not damage the engine if it is designed by someone who has a clue what they are doing. However, when you bolt on an aftermarket exhaust, you will probably need to re jet or re map the engines fuel system.

Is it bad to run an engine without exhaust?

The only real problem with running any engine without exhaust manifold or with an open header for that matter is backpreassure. Valves are not designed to operate without some resistance. You also run the risk of cracking the valves, due to the open exhaust ports.

Will removing baffles hurt my bike?

Removing the baffles will change how the engine runs. It will usually cause the engine to run leaner (less fuel), and a lean mixture burns much hotter that can cause damage. Removing the baffles will also mess up the power curve of the motor.

Is it bad to run a Harley without baffles?

But back to riding without a baffle. The worst you can do is free up some air movement – which is good, unless it changes your AFR too much. It will change air fuel mixture and that needs to be corrected but you could run straight pipes and it won’t hurt anything as long as it’s tuned.

What happens if I take my exhaust off?

Just cutting off your muffler will most likely result in a louder exhaust note with maybe a few horsepower gain, but nothing you’ll notice. You’ll just hear more of your engine, which can be bad. Not all engines sound great without the muffler.

Is it bad to leave motorcycle in the rain?

Yes. Motorcycles are designed to be ridden in the rain, so leaving one out to get wet every once in a while isn’t going to hurt it. It is best to store your motorcycle indoors, but that isn’t always possible. This will help allow and water vapor to move away from the bike while it is under the cover.

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