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What happened to the backfiring of the gasoline engine?

- May 28, 2018 -

What happened to the backfiring of the gasoline engine?

Small engines of lawn mowers, chain saws, or other equipment produce explosive noises when they shut off.
It's likely that your gasoline engine is exploding.
Another possible cause is engine tempering, which is relatively quiet and is usually due to engine design and carburetor problems.
Why, then, did the firing opportunity produce a return fire?
Is there a way to solve this situation on your own?


What is firing and tempering?

Blasting is an explosion in the muffler after the engine has died down.
After the mixture into the exhaust pipe in Mars or on the exhaust pipe of exhaust the phenomenon of high temperature and high pressure, combustible mixture combustion rapidly, forming a high pressure gas rushed outward, resulting in a shooting phenomenon (i.e., detonation in a limited space).
It increases engine fuel consumption, reduces power, and even causes the exhaust pipe to burst.

Tempering refers to the sound, puffiness, or explosion of the carburetor when the engine is running or shutting down.
Popular point said, it is inside the cylinder, the piston completes the work, should be after combustion exhaust fumes from the exhaust pipe, but for some reasons, the exhaust valve has been closed, exhaust gas can't discharge, or can not afford time to discharge waste gas.
The exhaust gas will be discharged from individual cylinder of cylinder head, crankcase, carburetor, throttle valve and other places, which is often referred to as "pour irrigation", i.e. engine tempering.

Note: tempering and muffler blasting in carburetor will not damage the engine at all!

The reason of small engine blasting and how to solve it?

After the engine is shut down, there may be an explosion.

Common reasons for firing:

Shut down the engine at high speed, causing the combustible mixture to ignite into the high temperature muffler.

Gasoline containing ethanol is more likely to ignite, which may lead to the firing of guns.

The carburetor mixture is too concentrated;

The type of muffler for small engine and the reason of manufacturing process;

The backfired solenoid valve is not working properly.

Possible solutions:

Allow the engine to cool at an appropriate speed without load (15-30 seconds);

Switching to other gasoline without ethanol or ethanol;

Inspect or clean the carburetor to obtain a suitable mixture;

Please contact the equipment manufacturer for update design of muffler and other devices.

Check whether the anti-afterburning solenoid valve is working normally.

Quote from:http://sh.qihoo.com/

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