whistle sound when starting

[rion]

may it gas or diesel, turbo or n/a, anyone notice your rides whistle when you startup your engines? saan po ba galing yung sound?

[afrasay]

baka may ***y na dumadaan...hehehe. Slipping belt malamang. Bigla kasing ginising yun mga belt when you start the engine.

[speedyfix]

the filter sucking in air... pero malamang nga belt.

[4JGtootsie]

Reduction starter? High pitch?
Hindi naman seguro lalagpas kay Rion ang loose or oily belt. Tuwing start up daw if belt it will happen sa high rpm or at engagement.

[CVT]

Typically, belt(s) nga.... Or, pulley?...

How about valves?

5000:boom:

[jazcker]

oo nga...bakit nga ganun? pero tingin ko it's the sound of the air being sucked.

[v6dreamer]

baka may ***y na dumadaan...hehehe. Slipping belt malamang. Bigla kasing ginising yun mga belt when you start the engine.

Oo nga no! Di kaya yong driver ang seksi kaya pati engine sumisipol. Peace bro.

Could been sign also of lossing compression of your engine.

[mbeige]

It could be a few things:

If your AC is left on when the car was shut off the previous night, it could have been activated and it's sucking air from outside

If your air filter tubing has a small pinhole leak it can cause a whistling sound, more evident when driving and accelerating

If your air intake tubing is a bit loose it can cause a whistling sound too, more evident when driving and accelerating

Does it disappear when it gets warm? Does it get louder when you do something?

[4JGtootsie]

I think Rion is inquiring in general and doesnt necessarily mean something is wrong with a specific engine.

Before i came accross a topic on how to check compression by the noise it creates and the resistance it makes with the starters speed.

This test is fairly accurate but must be done with an ear that can distinguish and identify pitch easily. This test is performed by cranking the engine for 5 to 10 seconds and listening for irregularities in the way the engine spins.

As each piston comes up on compression stroke, the resistance of the air being compressed within the cylinder momentarily slows the cranking speed,impossing a greater load on the starter. If all of the cylinders are sealling equally well,each momentary slowing would be more or less identical.

For those like me who has manually cranked an engine from the pulley can attest to the noise and the imbalance of pressure when turning the cranshaft.

Dont forget to unplug fuel solenoid and return it after.

[rion]

am I the only one noticing it? I notice these most of the time in any cars brands, some are even brand new.

I hear these whistle as the engine starts at the moment of click. then disappears...

porbably belt or air sucked nga. thanks guys.