Everything You Need to Know: FAQ About Engine | Stirlingkit

Welcome to our FAQ blog! Here, we've compiled the most common questions we ask about our products, whether you're new or an experienced user. This post is to help you make an informed decision and solve any questions you may have. Whether you want to know about basic engine questions, installation tips, compatibility, or maintenance advice, we've got you covered. In this post, we'll answer common questions that customers frequently ask to ensure you get the best experience with our products. If you've ever had a question, there's a good chance the answer is here - keep reading to find it!

1.What kind of fuel and oil (lubricant) does the engine use? How much should be added? How is it lubricated? Where can I buy it?

1. Gasoline engines use 92# and above gasoline fuel, and 2T engine oil (viscosity is determined by the specific model, generally 5W-20); the amount of gasoline and engine oil added is appropriate (according to the requirements of the manual or experience); the mixed lubrication model uses a gasoline and 2T engine oil mixing ratio of 25:1; independent lubrication models use gasoline and lubricating oil separately, gasoline is added to the fuel tank, and engine oil is added to the engine oil port;
2. Nitro engines use 20-25% nitro fuel, and the lubricant uses paste grease (butter); the amount of nitro fuel and lubricating oil added is appropriate (according to the requirements of the manual or experience); mixed lubrication models use nitro fuel, nitro fuel is added to the fuel tank, and lubricating oil is added to the camshaft;
3. Fuel and lubricating oil can be purchased at local hobby shops, or Amazon and eBay generally have them.

2.Will my motor become more explosive if I replace it with a larger capacitor?

The capacitor of the brushless ESC mainly protects the internal circuit board and has little effect on the power output.

3.The bigger the BOOST and TURBO are, the higher the motor speed will be?

Within a reasonable range, increasing the timing angle can indeed increase the motor's speed, but it will also cause additional heat and power loss. If it exceeds the reasonable range, the motor may slow down or even burn out due to overheating.

4.What do the T number and KV value of a motor mean?

The T number of a motor refers to the number of turns of the internal coil, and the KV value is a parameter that indicates the motor speed, which refers to the increase in the motor's no-load RPM for every 1V increase in voltage. For motors of the same specification, the lower the T number, the higher the KV value of the motor, the higher the maximum output current, but the lower the torque. The quality of a motor cannot be judged by the T number or KV value alone, because they are suitable for different occasions.

5.How to match the gear ratio of the motor?

The gear ratio needs to take into account many factors and cannot be generalized. It is recommended that you find an experienced player to help you or look up settings similar to your configuration online. Generally speaking, a normal gear ratio allows your motor to work under a reasonable load, so the temperature of the motor will also be within the normal range.

6.What is the best temperature control for the motor?

From the perspective of safety and life, the lower the operating temperature of the motor, the better. However, under competition conditions, try to control the motor temperature (based on the measurement of the housing) below 80 degrees.

7.The motor temperature is very low. Can the motor gear be enlarged to increase the speed?

If you only want a higher top speed, then yes. But if you are racing on a track, you need to consider the effects of acceleration and braking. Increasing the motor gears can sometimes result in a loss of lap time in these two aspects.

8.My engine stalled after a while, but I blocked part of the throttle with my hand and it worked fine again. What's going on?

Generally, there is a deviation in the ignition. Recommendations
(1) Oil ratio 25:1 ;
(2) Normal angle of magnet 40-45 degrees. If there is a deviation, this problem will also occur. Because they are assembled by the dealer themselves, it is possible that the magnet position is not installed correctly and the sensor has moved (connection below CDI).

9.How long can a 1 liter petrol engine run?

It can run for about 250 minutes, or about 4 hours, at normal speed.

10.What are the advantages of a four-stroke engine?

It has low fuel consumption, stable idling speed, small vibration, small noise and low emission pollution, so it is very suitable for simulation models.

11.After the engine is started and shut down, I hear a "clicking" sound, and the starter belt is reversed. What's going on?

The fan wheel is installed upside down, and the belt is too tight and rubs against the fan wheel.
Solution:
(1) Pre-ignite;
(2) Check the pulley;
(3) Check whether the fan wheel is installed upside down

12.What to do if the throttle rocker arm is stuck and cannot be adjusted

Check whether the rear cover screw of the throttle rocker arm is blocked.
(1) Check whether the idle screw is tightened;
(2) Check whether the rear cover screw of the throttle rocker arm is blocked.

13.What should I do when the engine is spraying oil or air at the air door?

The gap between the rocker arm and the valve cover is too large, resulting in a gap in the intake valve. Repair the valve cover

14.My engine is overheating, slow to absorb fuel (or not absorbing fuel), spraying fuel, and has no low speed. What should I do?

The belt at the timing pulley is out of alignment. Align the timing belt

15.When the engine is running, drip alcohol onto the spark plug. What should I do if alcohol sprays out?

Spark plug leaks.
(1) Main engine leaks: piston ring leaks, cylinder head leaks, spark plug leaks;
(2) Disassemble the engine to check for tightness

16.My engine spark plug can ignite when it is pulled out and connected to the ignition plate, but it cannot ignite when the spark plug is screwed on the engine

The cylinder head is leaking because the cylinder head screws are used incorrectly.
(1) Assembly problem, pay attention to the large screws;
(2) Tighten the screws when tightening

17.When the engine is running, the carburetor sprays fuel and a "bang bang bang" sound can be heard. What's going on?

The rocker arm screws are loose and the rocker arm is installed in reverse order, causing metal friction with the camshaft, so the parts need to be replaced.

18.When my engine starts, it doesn't suck oil, but the throttle sucks air. What's going on?

The oil nozzle and the fuel injector are clogged. Remove the fuel injector and clear it.

19.The engine cannot work when the start switch is pressed?

The problem points need to be checked step by step:
(1) First check whether the battery is powered, fully charged, and has sufficient voltage?
(2) Check whether the circuit is connected correctly?
(3) Turn on the power, and when the start switch is pressed, can the engine flywheel rotate? If not, it means that there is a problem with the starter module; if the electric starter can drive the flywheel to rotate, it means that the starter module is not broken;
(4) Then check whether the ignition circuit is correct, whether the positive and negative poles are connected, whether there is a spark, and whether the spark head is hot? If not, it is possible that the polarity is reversed and the ignition is burned.
(5) Is there compression in the engine? Can the carburetor absorb fuel normally? If not, you need to block the carburetor damper by hand to allow fuel to enter the carburetor smoothly. Then start the engine.
(6) Check whether the ignition timing is correct, whether the carburetor oil needle is set correctly, and whether the valve clearance is reasonable.

20.How to set the engine's carburetor needle (main needle, auxiliary needle)?

Each engine oil needle will be set with a factory default value, and the settings are slightly different. Please refer to the instruction manual for details.

21.When trying to start the engine, the spark plug does not heat up and there is no spark?

Check whether the engine wiring is correct and whether it is powered on. If it is powered on but there is no spark, there may be a problem with the ignition circuit. Make sure the positive and negative poles are connected, and short-circuit the circuit to see if there is a spark (accessories such as the ignition/Hall sensor/spark plug may have problems and need to be checked one by one).

22.The engine uses screws to fix parts. What is the specific torque specification?

We do not define a torque range, usually tightening the screws is sufficient. If you need a reference, it is recommended to use this torque specification for screw torque (unit: NM):
Specifications: Torque:
M2 0.333
M2.5 0.73
M3 1.38
M3.5 2.15
M4 3.12

23.The engine has no compression, no cylinder pressure, and valve leakage?

Usually, you hold the carburetor air door with your hand and turn the flywheel to feel whether there is suction or repulsion. If there is, there is cylinder pressure. If there is no cylinder pressure, you need to disassemble it to check whether the piston ring is damaged and whether there is any foreign matter blocking the valve and causing valve leakage.

24.What kind of battery do I need for my engine? Where can I buy it?

The battery you need depends on what kind of igniter you use. Generally, 2S-3S lithium batteries are used. If it is a battery box, you need 2 18650 batteries. You can buy them at local hobby model stores, or Amazon and other places.

25.Only one or several cylinders of the engine are working (one ignition cap head is heating up), is there a cylinder missing?

Swap the position of the ignition cap head and the connected cylinder. If the spark is transferred to another cylinder, there may be a problem with the igniter. If the same cylinder still works and sparks, there may be a problem with the spark cap on the non-working cylinder, or the piston ring of the non-working cylinder may be damaged, resulting in air leakage and cylinder failure.

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