Revving before you shut it down... Why?
Safety Car
Joined: Jul 2002
Posts: 4,269
Likes: 3
From: St. Charles IL
Cruise-In 5-6-7-8-9-11-12 Veteran
A CI-6 Car Show Winner
Re: Revving before you shut it down... Why? (Cookwithvette)
The reasons are very obvious, it's to let your wife know you are home so her boyfriend has a few seconds to gather his things and run out the back door. :lol:
Melting Slicks
Joined: Apr 1999
Posts: 2,675
Likes: 13
From: Sudbury MA
Re: Revving before you shut it down... Why? (Cookwithvette)
I asked this same question of a mechanic that I know and trust very much.
He has been racing cars for more years than I have been alive and is a consistent winner. He said it is the worst thing to do for an engine as it floods the cylinders with gas and washes away lubrication.
He feels letting the engine idle normally before shutting down is best for it. Also, revving slings off oil on reciprocating parts by centrifugal force (spelling?) which wouldn't happen normally when the engine is running because more oil would be pumped but since you are shutting down, you are shutting down dry if you rev just before you turn it off.
I don't know if this is true but he knows a hell of a lot more than I ever will and has torn down and built more engines than I can count.
He is still working on cars on a daily basis and will be 94 years old in December.
This guy can listen to an engine and diagnose everything about it. Most of the local guys who race, stop by with the cars in the trailers, they fire them up and he tweaks this and adjusts that and off they go to the races.
He has been racing cars for more years than I have been alive and is a consistent winner. He said it is the worst thing to do for an engine as it floods the cylinders with gas and washes away lubrication.
He feels letting the engine idle normally before shutting down is best for it. Also, revving slings off oil on reciprocating parts by centrifugal force (spelling?) which wouldn't happen normally when the engine is running because more oil would be pumped but since you are shutting down, you are shutting down dry if you rev just before you turn it off.
I don't know if this is true but he knows a hell of a lot more than I ever will and has torn down and built more engines than I can count.
He is still working on cars on a daily basis and will be 94 years old in December.
This guy can listen to an engine and diagnose everything about it. Most of the local guys who race, stop by with the cars in the trailers, they fire them up and he tweaks this and adjusts that and off they go to the races.
Burning Brakes
Joined: Jun 2002
Posts: 809
Likes: 0
From: Derry NH
Re: Revving before you shut it down... Why? (Frank75)
I always thought it was a carryover from the "good ol' days" when cars had generators and revving it then shutting off the ignition let it charge the battery a bit without sapping any juice from it.
It didn't make much sense then either.
It didn't make much sense then either.
Burning Brakes
Joined: Jun 2002
Posts: 809
Likes: 0
From: Derry NH
Re: Revving before you shut it down... Why? (ksbunting)
I asked this same question of a mechanic that I know and trust very much.
He has been racing cars for more years than I have been alive and is a consistent winner. He said it is the worst thing to do for an engine as it floods the cylinders with gas and washes away lubrication.
He feels letting the engine idle normally before shutting down is best for it. Also, revving slings off oil on reciprocating parts by centrifugal force (spelling?) which wouldn't happen normally when the engine is running because more oil would be pumped but since you are shutting down, you are shutting down dry if you rev just before you turn it off.
I don't know if this is true but he knows a hell of a lot more than I ever will and has torn down and built more engines than I can count.
He is still working on cars on a daily basis and will be 94 years old in December.
This guy can listen to an engine and diagnose everything about it. Most of the local guys who race, stop by with the cars in the trailers, they fire them
up and he tweaks this and adjusts that and off they go to the races.
He has been racing cars for more years than I have been alive and is a consistent winner. He said it is the worst thing to do for an engine as it floods the cylinders with gas and washes away lubrication.
He feels letting the engine idle normally before shutting down is best for it. Also, revving slings off oil on reciprocating parts by centrifugal force (spelling?) which wouldn't happen normally when the engine is running because more oil would be pumped but since you are shutting down, you are shutting down dry if you rev just before you turn it off.
I don't know if this is true but he knows a hell of a lot more than I ever will and has torn down and built more engines than I can count.
He is still working on cars on a daily basis and will be 94 years old in December.
This guy can listen to an engine and diagnose everything about it. Most of the local guys who race, stop by with the cars in the trailers, they fire them
up and he tweaks this and adjusts that and off they go to the races.
Racer
Joined: Mar 1999
Posts: 347
Likes: 0
From: Phila PA
Re: Revving before you shut it down... Why? (ksbunting)
To go along with a previous response, I to disagree with the revving procedure before shutdown. think about it, not only does it wash the cylinders down, but picture yout oil pan, filled with oil, you then rev the engine which in turn sucks all of the oil from the pan into the upper part of the engine, to then shut it off!!! Why would you want to to that???? If you go to restart the engine, where is all of the oil???? Think about it!!! Like someone else stated, if you like to rev, let it idle about 15 seconds after before you shut it down, your engine will last longer. Remember most engine wear occurs at start-up, you want all of your fluids, especially the oil to be where it is supposed to be!!!!!!!!!!!!!!!!
Later................................... ........................................ ..Tom
Later................................... ........................................ ..Tom
Pro
Joined: May 2002
Posts: 726
Likes: 0
From: Petaluma CA
Re: Revving before you shut it down... Why? (Cookwithvette)
I do it to make sure the alternator fills all the wires with lots of electrons and coulombs. Otherwise the wires will dry out. And starting up a car with empty electrical wiring is real bad for the car. :D
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Le Mans Master
Joined: Sep 2002
Posts: 9,386
Likes: 0
From: 30 mins north of Charlotte NC
Re: Revving before you shut it down... Why? (Stevo81)
dry/empty wires can destroy a canooter valve on a distributer real quick :)
[Modified by Titanium Rat, 1:24 PM 10/21/2002]
Burning Brakes
Joined: Jun 2002
Posts: 809
Likes: 0
From: Derry NH
Re: Revving before you shut it down... Why? (ksbunting)
Wilmington, MA
:hat
