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Old 19th April 2010, 22:46   #31
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Originally Posted by mTorque View Post
Read through this tread, it was quite useful.

An ignorant question - I was under the impression that using A/C (manual) with a fan speed set to lowest (say #1) will be of minimal load to the engine. But a Maruti service engineer said that engine load for A/C does not depend on the fan speed (i.e fan speed #4 will have the same load as #1). Is this true? Thanks!
The blower is just an electric motor that is connected to the battery. The blower throws air which passes through the cool fins of the AC system and thereby cools the car. Keeping the Blower on max will most definitely put more load on the engine because when air passes through these fins at higher speed, the fins lose a lot of its coolness thereby putting that much more pressure on the compressor. You will notice a more frequent cut-off and turn-on of the thermostat switch when the fan/blower is on higher speed. Therefore the Maruti engineer is partially incorrect IMO.

So long.....
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Old 19th April 2010, 22:51   #32
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Originally Posted by Sutripta View Post
...why should the catcon get ruined. Agreed it will be way below "light-off", and thus not working, but ruined?
Potential chances of being ruined... with soot deposition from burnt engine oil in case the engine is less than perfect. The catalyst gets coated over for ever, and cannot burn off the soot to expose the catalyst again, light-off temp achieved or not.
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Originally Posted by sanjayc View Post
...in a nutshell, while keeping one eye on the watch, another eye should be at the temp guage. As long as the engine temp is hovering around normal, we should be able to wrap up some unavoidable work in a/c comfort.
You got it right... as long as you don't keep working all day. Have fun... Go for that drive.

Last edited by SS-Traveller : 19th April 2010 at 22:54.
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Old 20th April 2010, 08:11   #33
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[*]As a result the top end of the engine potentially may not get adequate lubrication, leading to increased wear of valves & guides, cams, rockers etc.[*]There is not enough exhaust flow at idle to wash out the gases from the catcon, silencer and exhaust manifold;[*]The exhaust system runs superheated after a while, with soot accumulation happening esp. if it's a diesel (this also can set off a fire under your car if you are parked on dry grass);
Would blipping help?
^not revving,

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running the car for 30 minutes as you describe is not going to cause any significant harm to either engine or battery (or any other component), but running it that way for 3 hours would.

Hope this helps.
Thanks,
yup 30-45 mins is the max the car might be intended to use this way
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Old 20th April 2010, 09:28   #34
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Would blipping help?
^not revving
Gentle revving to @1500rpm for 30-60 sec after every five minutes would help to address some of the issues cropping up. Blipping is no help.
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