Two Stroke Induction

Category: Snowmobile Engine

2 srtoke piston port engine 

 There are three general types of two cycle induction. The most simple type of air intake induction is called a piston port engine. This type of two stroke engine has holes cut through the cylinder walls in specific areas. The second type of induction, and the most popular type, is reed block induction. This consists of multiple reed petals that allow air into the crankcase and keep it trapped there. The third type of two stroke induction is generally used in rotax two cylinder engines is the rotary valve engine. It does slightly better than reed engine because there is no restriction from reed petals. The rotary valve rotates past the crankcase intake port at a specific time to allow air through then seal the air into the crankcase.

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2 Stroke Engine Repair

Category: Snowmobile Engine

two stroke engine

 

 

 

 

 

 

 

 2 Stroke engine repair can be accomplished once the severity of the problem or damage is assesed. As with all engines, they require two basic things to operate. First all engines require fuel. There are a few ways to check if the engine is getting fuel. Remove the spark plug and see if they are wet. If the spark plug is not wet, you can remove the float bowl to see if fuel is being delivered to it. If there is no fuel you can check the needle and seat of the carburetor, or the fuel pump. You can generally repair a sticking needle simply by moving the needle manually. If the 2 stroke engine is fuel injected you will need a fuel pressure gauge and will then need to attach it to the fuel rail. Check that the specified pressure is being reached. If not, the fuel pump is probably faulty. The next important thing to check is that the engine is producing spark.

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Idle Air Control Valve Replacement

Category: Auto Tuning

idle air control valve
Does your car idle rough or the speed cycle up and down. You probably have a bad idle air control valve. The only purpose of the idle air control valve is to keep the engine’s idle smooth. The engine’s computer gives the idle air control valve the feedback it needs to hold a constant rpm. The idle will be around 1000 rpm’s when not in gear and around 800 rpm’s in gear. This iac valve is on a Nissan Maxima and is similar to most idle air control valves.

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Clutch Slave Cylinder

Category: Auto Tuning

clutch slave cylinder
Rebuilding a clutch slave cylinder is sometimes needed after the clutch petal is no longer working. First you should check the clutch fluid container to verify it is full. If not follow the line down to the slave cylinder while looking for leaks to identify the problem. The clutch slave cylinder is located behind the passenger side wheel on this vehicle, a miata. Remove the two bolts and the clutch line and the slave cylinder should come off to the right side.

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Sheared Flywheel Key

Category: Small Engine Repair

tecumseh 6.5
If you have a lawnmower that is backfiring or pulling the pull start out of your hand, the flywheel key may be sheared. The key in a small engine mates the flywheel to the crankshaft in a certain spot. The flywheel can only fit one way or the timing will be incorrect. The flywheel key can be sheared if a heavy object was hit by the mower, such as a rock. With no key keeping the engine in the right place it will no longer run correctly.

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Clutch Master Cylinder Rebuild

Category: Auto Tuning

clutch cylinder
If your clutch petal has ever lost pressure and the petal will not dis-engage the clutch, there is a leak. The leak may be air sucking in or fluid leaking out. First check the clutch fluid reserve, if it is low you will need to identify the leak. There should be a puddle of fluid at the leak. If a leaking line is not the culprit it may be the clutch master cylinder. If the clutch master cylinder or slave cylinder is faulty, there may be no loss of fluid. The clutch master cylinder is located on the firewall attached underneath the fluid reserve tank.

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Air Temp Sensor

Category: Auto Tuning

air temperature  sensor An air temperature sensor is used on fuel injected engines. The purpose of an air temperature sensor is to help the computer calculate air density. A change in temperature changes the resistance in the sensor. Simply stated, the higher the air temperature gets the less dense the air becomes. As the air becomes less dense the computer knows that it needs to lessen the fuel flow. If the fuel flow was not changed the engine would become rich, possibly losing power and consuming more fuel. The temp sender is generally located in the air inlet tube or the air box. The wire running to the sensor can be disconnected then the sensor can be unscrewed and replaced. Some aftermarket companies trick this sensor with a resistor (false temp reading) to make the engine run richer. If a engine has been tuned lean this trickery can show mild power gains.