is it bad...

[ice27]

to rev your engine before you shut it off...need your inputs please..what are the effects?
reason why i rev my engine before shutting down is i want the battery to charge first, since my sound setup drains my batteries. pls help...thanks!!

peace!!

[1D4LV]

personal experience ko dito.

i used to do it before para madaling start sa umaga sa former car ko. the only thing i noticed is that may nangangamoy na gasoline smell after shutting down the engine. if i don't do that, wala namang amoy.

i don't think revving your engine twice or thrice before shutting of the engine can charge your battery effectively. battery life is dependent on the condition of your alternator eh. if your alternator is good, it charges your battery while you are moving, so parang walang nawawalang power sa battery mo. if not, hindi tama ang charging ng battery, resulting in diminished battery power during startups.

i just don't know the opinion ng ibang peeps dito. :wink:

[ghosthunter]

reving your engine before you shut down will only leave some unburned gasoline in your cylinders. Overnight, the gasoline might leak down to your engine oil andf contaminate it in the long run. If you need to "charge up" your batteries, better repalce your alternator with a larger capacity version or get a plug-in car battery charger to recharge your battery overnight.

[ice27]

sirs...according to my service advisor, my alternator ratings is 90amp; 13.5volts...liit kse ng battery ng crv eh...1sm lang..eh ang lakas kumain ng setup ko..yun lang naman ang concern ko eh...thanks for the inputs!!

peace!

[OTEP]

Revving before shutting off will not charge the battery in any significant way. Most of the time, it will only cause more harm than good.

Baka kailangan mo na ng capacitor para sa set-up mo.

[1badGTS-R]

Theres the culprit!

Try to upgrade to a larger battery, paktay talaga 1SM mo niyan. :mrgreen:

[mdpo]

bakit naman madradrain yung batt mo when u didnt open ur setups. baka may wiring ka na shorted which drains your battery. Kung araw araw mo naman gamit di naman siguro madrain yan... ang mostly lang naman gumagana when nakapatay ang engine is alarm and clock which really consumes very minimal power lang.

Kung gusto mo talagang medyo malakas ang battery meron naman mga hi-end na battery dyan na pang setup. have tried one sa honda ko pero di lang nga ganung katagal ang buhay. mas maganda parin kung magpalit ka ng malaki laking battery... kung kakasya. =)

IMHO lang po

[kiper]

revving begore shutting down - masisira ang protective film sa cylinders ng makina. -tama ba yun?

[AC]

sabi sakin ok lang rev before shut of... basta antayain mo bumaba yung rpm needle sa place na steady na? heheh... but ofkors... my info cud be wrong... ahehehe...

[dazedchiq]

dba sabi nila revving it before shutting the engine down will eliminate something from the engine? carbon ba un.. i'm not sure, nakalimutan ko na kasi, e

[jojoico]

sa carbed engine lang ata effective yun, di na sa efi

[yebo8]

don't do that!

This practice of revving up before shutting down the engine is true only for military jeeps circa 1940s because those were equipped with carburators that get vapor lock in the mornings. Hindi ka naman sundalo ng world war II e bakit gaya-gaya ka sa kano?

These are what will happen if you do this:

1. It will destroy the catalytic converter (most new model cars are equipped with one.) It leaves unburned gasoline in the cat and this causes early failure of the catalysts inside. IT CAN ALSO LEAD TO AN EXPLOSION, AND I MEAN A BIG ONE! If you want to find out how big an explosion, put half a teaspoon of gasoline in a garbage bag, fill with air, shake and then light it up. Remember that 1 liter of gasoline mixed with air in the right amount has the explosive equivalent of 100 sticks of dynamite. Well if that is what it takes to wake you up in the morning e di bahala ka sa buhay mo, kung buhay ka pa ha.

2. It leaves unburned gasoline in the cylinders, exhaust pipes, cat and muffler which contributes to air pollution in the form of SMOG. Do you want your children to breath that when you start your car in the morning?

3. It wastes gasoline/diesel. Since it is left unburned, it is just the same as spilling it. Asyong aksaya ka ba?

4. That practice will leave gasoline on the cylinder walls and guess what happens when your enginewhen you start your car again. The piston and cylinder is lubricated not with oil but with gasoline, so expect premature wear on the rings and cylinders if you do that often. And as you do it over time, the gasoline condenses in the crankase leading to diluted oil. Do you want this for your engine?

Please read the user's manual of your car. It says there specifically NOT TO DO THIS.

Regarding what dazedchick said about removing carbon, if you want to remove carbon deposits from the valves and exhaust, the best thing to do is to red line your engine once in a while under load (i.e., while the car is moving in gear). That is what is called the "Ferrari tune up", taking your car to the expressway and just flooring the gas.

[kiper]

ayos ung ferrari tune-up!!

atleast in-motion ung sasakyan mo!!:mrgreen:

[mbt]

yup, it's not good practice at all. all that unburned fuel invites trouble as yebo8 has expounded on.

i once saw a middle-aged man driving an SiR rev it up to 3000 rpm and suddenly shut the engine off while the revs peaked... aray! and this was during the day, and in school.

[ice27]

yikes...that's exactly what im doing...reving it and then shutting my car off...i'm going to have my capacitors installed soon...wala pa kse me time dalhin sa installer ko e...thanks sa mga inputs...anyways, what's the best thing to do para hindi madrain ang batt?

peace!!

[theveed]

and it doesn't make ANY SENSE AT ALL...

just think about it... what would your single rev do compared to the several hours you've spend driving the car??? your engine would be revving over 2-3KRPM when your driving anyway, what difference would one rev make?

another one of those pinas old-mechanic's-tales...