why is the cold hard on motors?

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Larry

why is the cold hard on motors?

Post by Larry » Tue Feb 19, 2008 5:30 pm

serious question. I'm just a fan,,shoot,,I dont even change my own oil.

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Re: why is the cold hard on motors?

Post by Sprint 76 » Tue Feb 19, 2008 5:58 pm

A few reasons. Mostly on start up and getting heat in the engines. Metal shrinks as it gets colder, so all the bearings in the motor aren't at ideal clearances. The oil is also very thick at low temperatures, which will prevent oil from getting everywhere it needs to be until the motor gets hot. The colder air is more dense, containing more oxygen and producing more power, so in general, there is also slightly more stress on the motor.

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Re: why is the cold hard on motors?

Post by mystic1582 » Tue Feb 19, 2008 7:31 pm

There are basically 3 differing materials within a 410 motor. Titanium, Aluminum, and cast iron (as well as steel). All these materials have different coefficients of expansion, or rates of expansion/contraction. To get the motors to temperature takes time because of the ambient temperatures. A motor is designed to run at a certain temperature, say 200 degrees F for example. Until this optimum temerature is achieved the internal clearances of the motor are not optimized. Again the ambient temp. is a factor because when the motors run on the track they are cooled faster as well..so the optimum running temperature is compromised... Kind of like when you get out of bed in the morning...you are groggy, sleepy and stiff...now imagine trying to slam dunk a ball, or hit a home run etc right away...things are going to get pulled strained and you coordination is not going to be in sync.

Larry

Re: why is the cold hard on motors?

Post by Larry » Tue Feb 19, 2008 8:08 pm

mystic1582 wrote: Kind of like when you get out of bed in the morning...you are stiff......things are going to get pulled
:shock:

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Re: why is the cold hard on motors?

Post by RacerRose » Tue Feb 19, 2008 8:35 pm

I would also like to add that the fact of the engines burning methanol doesn't help in getting the engine temps up either.
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Re: why is the cold hard on motors?

Post by Flyersfan » Tue Feb 19, 2008 8:36 pm

Larry wrote:
mystic1582 wrote: Kind of like when you get out of bed in the morning...you are stiff......things are going to get pulled
:shock:


:doh:
:oops: :roflmao:

Larry

Re: why is the cold hard on motors?

Post by Larry » Tue Feb 19, 2008 8:43 pm

does methanol burn at a lower temp than gas?

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Re: why is the cold hard on motors?

Post by Sprint 76 » Tue Feb 19, 2008 9:57 pm

Methanol vaporizes much faster than gasoline, cooling everything it touches. If you've never felt it, it's similar to touching rubbing alcohol. When the cars are run in the summer when it's humid, the injection stacks will "sweat" from being cold.

Larry

Re: why is the cold hard on motors?

Post by Larry » Tue Feb 19, 2008 10:04 pm

thanks to everyone who took the time to fill in some blanks for me.

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Re: why is the cold hard on motors?

Post by Dave Bolger #18 » Tue Feb 19, 2008 10:21 pm

In cold temps start-up is an issue, especially with many conventional motor oils. Cold engines don't make good power. We don't like it in the pits much either.
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Re: why is the cold hard on motors?

Post by STEVE PATTERSON » Tue Feb 19, 2008 10:36 pm

we pre heat the motors and things seem to be ok......rear end does not like cold weather...on drag cars we jack them up and run them in grear to warm rear up before we run.........
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Re: why is the cold hard on motors?

Post by Brent Leach » Tue Feb 19, 2008 11:01 pm

Me like alcohol. :laughing7:
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Re: why is the cold hard on motors?

Post by Larry » Tue Feb 19, 2008 11:18 pm

I'd like an "LE" baseball cap to sport at the track this year.

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Re: why is the cold hard on motors?

Post by Dave Bolger #18 » Wed Feb 20, 2008 6:47 am

Stop by the trailer Larry. I'll see you get one.
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Re: why is the cold hard on motors?

Post by harddrive » Wed Feb 20, 2008 7:55 am

Brent Leach wrote:Me like alcohol. :laughing7:

:laughing7: ... but do you change your "oil" after every night out ... :lol:
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