AC compressor + high rpm = damage?

[mbeige]

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]

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]

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]

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]

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

[BlueBimmer]

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]

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]

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]

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]

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

[bratski]

guys if this is true bakit yung sa gen2 crv ko dati nagpalit ako ng compressor 2 times in 4 years? yung 1st time sa casa then yung 2nd sa ibang shop sa banawe? all of them said na dahil daw due to excessive rpm? I find that hardly true kasi bihira naman ako mag hiway and hanggang 4k rpm pinakamataas na na reach ko. all of the compressors na pinalitan ko is orig pa (keihin ata tatak).sa bwisit ko binenta ko na yung sasakyan dahil Ive never experienced it on my other cars

[ineedmorehp]

^ baka naman lemon?

[BlueBimmer]

guys if this is true bakit yung sa gen2 crv ko dati nagpalit ako ng compressor 2 times in 4 years? yung 1st time sa casa then yung 2nd sa ibang shop sa banawe? all of them said na dahil daw due to excessive rpm? I find that hardly true kasi bihira naman ako mag hiway and hanggang 4k rpm pinakamataas na na reach ko. all of the compressors na pinalitan ko is orig pa (keihin ata tatak).sa bwisit ko binenta ko na yung sasakyan dahil Ive never experienced it on my other cars

minalas ka lang siguro at puro mahina na compressor napalitan sayo, gen1 crv ko with 105k on the clock orig compressor pa rin, granted di na tulad sa lamig ng bnew but still cold enough.

[Dr.Kamiya]

guys if this is true bakit yung sa gen2 crv ko dati nagpalit ako ng compressor 2 times in 4 years? yung 1st time sa casa then yung 2nd sa ibang shop sa banawe? all of them said na dahil daw due to excessive rpm? I find that hardly true kasi bihira naman ako mag hiway and hanggang 4k rpm pinakamataas na na reach ko. all of the compressors na pinalitan ko is orig pa (keihin ata tatak).sa bwisit ko binenta ko na yung sasakyan dahil Ive never experienced it on my other cars

They might have been overcharging your car with freon. This causes very high pressure under high RPM.

Of course, they blame high RPM when you bring it back to them, pero culprit talaga is freon overcharging.

[finchy18]

minalas ka lang siguro at puro mahina na compressor napalitan sayo, gen1 crv ko with 105k on the clock orig compressor pa rin, granted di na tulad sa lamig ng bnew but still cold enough.

agreed. same din to nga corolla ko 10 yrs orig ac comp and hindi talaga same ang lamig dati noong bago pa xya.. meron difference.. pero ok pa nman ang lamig.

[mbeige]

Yung Benz ko 24 years old na siya, I *think* original Harrison compressor pa rin yung nakakabit. Lamig lamig ng AC rin. Well it can only go 5250rpm hehehe. Diesel kasi.

[niky]

I always turn it off, just in case. The only problem would be that you're stressing the compressor clutch (automatically disengages at high rpms to prevent damage), but if he does it every single time, it's probably the same thing.

And, yes, it does make a difference. The guys at Speedlab showed us a B16A Civic on a roller dyno, being held at half-throttle... turning on the blower and compressor together cut maybe 15 hp from the engine's power. Yes, the SiR has a small engine. The only time the compressor will make a negligible difference in performance is on a big block or a 300hp + turbocharged engine... for us small N/A guys, it's like driving through molasses.

[bratski]

nung nasira compressor ko for the second time i took it to banawe and sabi nga nila na sakit na ng gen2 crv yun. talagang madaling masira,must be the compressor brand ata. I tried to find a fabricated replacement pero wala. Yung orig parin pinakabit ko and guess what? nasira after nung warranty. both times hindi overcharged ang freon dahil dun sa hi and low nasa tama naman (or at least yun ang pinakita sa akin), yung sa banawe malabong naloko ako kasi dun talaga ako nagpapagawa madalas. yung sa casa hindi ko sure. Kaya nga bago pa masira yung ika 3rd na compressor binenta ko na.

[ineedmorehp]

Imo and POSSIBLY WRONG (refering to cars up to 2005, or even later...), once you turned on the compressor it will not disengaged anymore simply because of the following reasons:

1. heat inside and outside and you're system can't sustain the temp you need. Unlike ACU in our house and office that once it reached the set room temp it will shut off. SIguro cruising speed problaby...

2. it disengage itself to rest for a while but not because you already reached the set temp.

3. other factors, etc.

AGAIN, as i mentioned its my opinion and POSSIBLY WRONG (by x percent). THough i do believe that it should disengage similar concept w/ home/office ACU.

[onedayoldchick]

tanong lang... bnew sanden compressor ko. 1month palang yata. parang hindi normal. kapag magrerev ako ng konti parang pipitikin ko ng konti yung gas kapag mag-go go na., mamamatay compressor ko (click sound). then on ulit. wala naman problema sa lamig. maginaw nga. patay sindi lang kapag biglang rev.