Full Answer
What makes a blower surge?
What makes the blower “surge”? This is caused by a rich/lean cycle at idle. As the motor leans out the RPM’s increase and richen up the motor, when the motor richens the RPM’s decrease and the motor leans out again. This continual cycle is known as “blower surge”. With proper tuning, some of this surging should be able to be eliminated.
Do blowers need to be set up too tight?
Obviously for the street they dont set them up too tight do to the added heat in the blower. When were tuning up a blower motor if you add more idle fuel it will surge more, lean it out and it will smooth out. Most of our customers ask for the surge but if the blower isn't tight enough you wont get it to surge.
Can a supercharger cause a surge?
Thus, when you have a surging problem (which is not good) you have a lean condition occuring at some point in your induction. This is true whether you are running a blower or normally-aspirated. A supercharger can cause the engine to surge if the boost pressure is varying. High-boost setups are more prone to boost surge.
What causes a blower motor to go bad?
Another reason why a blower motor might go bad is due to rust in the motor’s internal components. Rust in a blower motor is a symptom of a dirty blower motor.
What causes a blower motor to surge?
This is caused by a rich/lean cycle at idle. As the motor leans out the RPM's increase and richen up the motor, when the motor richens the RPM's decrease and the motor leans out again. This continual cycle is known as “blower surge”.
What is Blower surging?
By definition, blower surge is a rhythmic acceleration and deceleration of engine speed at idle. It's prone mostly to V8s that are force-fed with a large Roots-style supercharger. Granted, an uneven idle condition can be found in many different engines.
What is rise to surge?
The HRTS is a measure of the rise in the head (at constant speed) when the operating point moves toward the surge line. Other common terms related to HRTS include pressure rise to surge, and pressure ratio rise to surge.
Why are superchargers called blowers?
Technically speaking, roots-type superchargers do not actually compress air internally in the supercharger; instead, they push air into the intake manifold into the engine. That is why is type of supercharger is sometimes called a “blower” rather than a compressor.
Does the air condition affect idle?
Atmosphere conditions do effect idle so doze lobe center on cam shaft the wider the lobe center is the better the idle and timing is a factor.But a isolating engine just needs the idle turn up.
Can you tune carbs to get rid of surge?
Tuning a carb takes time, blower motors can be difficult to get rid of surge. The higher the idle the easier it is to get rid of. You can also lock the timing out on a blower motor and that seems to help also. With Bravos it's a little harder if you are trying to set the idle low enough to shift. Once your off the idle circuit the surge usually goes away.
What happens if a blower motor goes bad?
If the electrical system in your motor goes bad, a surge or dip in power will trigger the fuse to blow in order to prevent a short-circuit. On a similar note, you should take a look at the actual temperature of the motor.
Why does my furnace blower go bad?
A furnace blower can go bad for a wide range of reasons including old age, electrical failures, bearings failures, or dirt accumulation. If you want to try to prevent your furnace blower from failing prematurely, just maintain your furnace and the surrounding area well.
How long does a furnace blower motor last?
A furnace blower motor usually lasts about the same amount of time as the furnace. So, you should expect your furnace blower motor to last between 10 to 20 years on average. The more reliable the brand, the more likely it is to reach the 20-year mark without serious problems.
How much does it cost to replace a furnace blower motor?
Top of the line, multi-speed furnace blower motor replacements can easily exceed $1,500 or more . Needless to say, this can be a serious financial peril for some families.
What does selective speed airflow mean?
Selective speed airflow means that you can only get the air to run at certain speeds—most often low ones. Your HVAC system is designed to move air at different speeds in order to give your home a balanced temperature. If you notice that you have selective speed airflow, then you probably have a failing furnace blower motor.
What happens if a blower motor goes bad?
If the blower motor is completely bad, then you’ll have no airflow at all. Strange sounds coming from blower. Blower motors can make all kinds of sounds, depending on what the issue is. Vibrations, grinding, and high pitched-noises are some of the sounds a blower can make if it’s going bad.
How to tell if a blower motor is bad?
Here are 4 common symptoms of a bad blower motor: 1 Low/no airflow from vents. The classic sign of a bad blower motor is restricted airflow coming from your air vents. If the blower motor is completely bad, then you’ll have no airflow at all. 2 Strange sounds coming from blower. Blower motors can make all kinds of sounds, depending on what the issue is. Vibrations, grinding, and high pitched-noises are some of the sounds a blower can make if it’s going bad. 3 Circuit breaker keeps tripping. A blower motor that’s seized up is bound to trip a circuit breaker. (A bad capacitor will trip the circuit breaker too, so be sure to check that first.) 4 Hot/burning smell coming from air vents. A bad blower motor will sometimes overheat, causing a “hot” smell to come out of your air vents. In the worst scenarios, your blower motor may actually start to burn. Yikes!
What to do if blower belt is snapped?
If the belt is snapped, then the blower won’t work. Replacing the belt is a fairly simple fix. Another thing to check is the capacitor. The capacitor is used to start the fan so it’s worth checking if your blower motor won’t start up.
Why does my furnace blower motor go bad?
Another reason why a blower motor might go bad is due to rust in the motor’s internal components. Rust in a blower motor is a symptom of a dirty blower motor. This is why it’s important to change your air filters regularly and make sure that there are no air leaks in your furnace.
Why does my blower motor overheat?
Lots of times, airflow restriction from a dirty filter will cause a blower motor to overheat. The excess heat in the motor will cause its performance to degrade, and the motor may fail altogether. If your blower has a fan belt, take a loot at it. If the belt is snapped, then the blower won’t work.
Why does my blower motor fail?
Rust formation inside the motor is another reason a blow motor may fail. Rust will cause a motor to seize up and prevent the motor from spinning. If your blower motor has bad bearings, damaged windings, or is otherwise seized up, then you’ll need to replace the motor.
What happens if you have bad bearings on a motor?
The bearings are the part that allows the motor shaft to spin freely. If you have bad bearings, then your motor will resist turning. Damaged motor windings are a little trickier to find. The windings are encased inside the motor, so you won’t be able to see a damaged one.
