Engine warmup

[Raymond@M-BeasT]

stat the engine and go.
drive slowly til the temperature gone up to the middle.

 

[LazyServer]

Interesting discussion.

See below, the remarks that I get from the web.

�When you first start up, the fuel injection is metering a very rich mixture to compensate for the cold engine. This washes the oil off the cylinder walls and accelerates wear considerably. Your goal is to get the engine warmed up as quickly as possible, and you do this by driving off as soon as the oil pressure comes up. The owner's manual recommends avoiding idling the car after starting. Treat the car gently until the temp gauge is off the peg though...�

 

[Mouse]

Originally posted by LazyServer@May 21 2006, 08:05 AM
Interesting discussion.

See below, the remarks that I get from the web.

�When you first start up, the fuel injection is metering a very rich mixture to compensate for the cold engine. This washes the oil off the cylinder walls and accelerates wear considerably. Your goal is to get the engine warmed up as quickly as possible, and you do this by driving off as soon as the oil pressure comes up. The owner's manual recommends avoiding idling the car after starting. Treat the car gently until the temp gauge is off the peg though...�

bro, can u provide the link. That means we should start our car and move immediately?

 

[Mouse]

Guys, I search through the web about warming up engine, almost all do not recommend it. Here is two article

1) Let it warm up first? That is against all the advice I've ever
heard. Wait till you have adequate oil pressure, then baby it (i.e.,
keep the revs down) until it is warm, but by all means, do NOT delay
the warming up process by letting the engine idle till warm. If you
keep the revs down, you are not really loading the engine, and you're
gas too.

I have an "Ask Pennzoil" sheet where someone asked them about cold
starting. The Pennzoil tech said that, unless the owner's manual
specificially states otherwise, to start the car, wait a few seconds for
the oil pressure to come up, and drive off, but not to dog on the car
until the water temp came up.

Being a typically impatient American, that's how I drive anyway, but I
was gratified to see Pennzoil thought it was OK too.


2) Yes. Too much idling is bad. Especially if the car is cold
to start with. The longer it takes the car to warm up above
the vapor point for the combustion byproducts, the larger
the amount of particulate formation and growth. This leads
to sludge, varnish and particulates in your oil. In addition
to the wear these types of particles cause, you also end up
needing to change your engine oil more frequently because these
get you to your oil's particulate threshold faster.

The same principle leads to the increased acids in the engine
oil, except that when acids are not boiled off promptly
(because you idled your car to warm rather than driving it
moderately to warm it quicker) you get corrosion of the engine
metals.

In addition to long idles to warm up, you can get the same
deleterious effects by taking lots of short trips. Since it
takes time above the byproduct boiling point to boil off
all the byproducts short trips, say under 8-15 miles, especially
in stop and go driving leave a lot of gunk behind.

If you can get your hands on an engine prewarmer (they should
be pretty common up there) it is well worth it.

 

[2cents]

But our engines already in warm climate counrtry all yr round. Air temp varies btw 85 deg F to 90 deg F mainly, so how? Dyu still think we hav to drive 8-15 miles to get rid of gunk? :dunno: