AC compressor + high rpm = damage?

**mbeige** · March 30th, 2007 08:24 PM

Whenever I'm in Manila and I'm with my dad in his SiR, he turns off his AC compressor whenever he goes WOT (around 8500rpm, maybe higher - I don't remember his max engine speed). Alam ko for slow and weak cars, this is beneficial to gain more HP. But for an SiR, I'm sure the power is not an issue.

He also said that having the AC on (compressor engaged) and running at that high engine speed causes AC compressor damage so he turns it off para hindi masira. So my question is, is this true? Or sabi sabi lang yon?

The moment it reaches Vtec (I don't remember, maybe 6200rpm? Maybe lower, he's modified it a lot...) is the moment he turns off the AC.

Salamat

**ineedmorehp** · March 30th, 2007 09:03 PM

Ako din i want to know if its true? Minsan nga naisip ko i-vent yung cold air ng aircon sa intake tube or intake. hehehe

**kuruma64** · March 31st, 2007 01:22 AM

kumusta muna,siguro walang masyadong katotohanan yon.alam ko kc my termo control ang lahat nang a/c,pag mataas ang rpm kotse mo mabilis lalamig ang a/c. pag malamig na,mag automatic off ang a/c.kaya ako hindi ko sinasagad ang A/C med lang kung naka top speed na ko or kahit sa loob nang city.maiiwasan mong masira ang A/C motor,hindi mahihirapan makina,tatagal ang V belt,mas matipid pa sa gas ang car mo.

**chick-boy** · March 31st, 2007 10:06 AM

ang alam ko mga sirs, may sensor ang compressor na kapag nahihirapan ang engine (lag or high rpm) nag di-disengage ang clutch ng ac compressor imho

**mbeige** · March 31st, 2007 10:35 AM

So there's no need to turn it off manually from inside the car?

**BlueBimmer** · March 31st, 2007 10:40 AM

high rpm will only damage your compressor if it is very low on compressor oil AND if your expansion valve is clogged then say byebye to your ac comp.

**mbeige** · March 31st, 2007 12:14 PM

That makes sense. But if the AC works perfectly, there should be no problem? Alright I'll report back to my dad

Thanks for your insights!

**rayban7g** · March 31st, 2007 09:34 PM

Originally Posted by kuruma64

kumusta muna,siguro walang masyadong katotohanan yon.alam ko kc my termo control ang lahat nang a/c,pag mataas ang rpm kotse mo mabilis lalamig ang a/c. pag malamig na,mag automatic off ang a/c.kaya ako hindi ko sinasagad ang A/C med lang kung naka top speed na ko or kahit sa loob nang city.maiiwasan mong masira ang A/C motor,hindi mahihirapan makina,tatagal ang V belt,mas matipid pa sa gas ang car mo.

+1

di ko rin ganung sinasagad yung thermostat ng oto ko eh, naka low setting lang (para at least madaling madis-engage yung comp at di mababad pati), nilalakasan ko nalang yung blower to compensate it.

Regarding sa kakahataw while a/c is on, then kung maingay na comp mo, dun mo nalang bigyan ng strict measures (on revving hard) para di lumala yung ingay nun, or worst case, bumigay yung comp.

**2Dmax** · March 31st, 2007 10:49 PM

the valid reason why turning off the a/c during engaging the engine into a high rpm is to gain more power. a/c is coupled to engine via belt and a/c is considered an engine load when a/c is turned on. hindi masisira un, japanese engineers had foreseen this issue/concern long before we think and question ourselves if this is an issue..

**recklus** · April 1st, 2007 01:28 AM

di yan masisira provided na you maintain your a/c system. i have my a/c cleaned once a year, i asked the mechanic once, for the compressor daw may sinusunod sila na high and low pressure, on the high side wag lang daw sosobra ng 200psi and 20-30psi sa low side. nakakasira daw ng compressor is if you exceed 200psi on the high side, causes daw para magexceed is dirty lines and too much freon charging. oo nga pala, it disengages daw before reaching 200 provided the system is working properly so no need to worry