What part of (respond off list) didn't all of you understand?
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-----Original Message-----
From: Rick Johnson
Date: Wed, 25 Feb 2009 15:49:53
To: Brian Mitchell
Cc:
Subject: Re: [OBRA Chat] turbos
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Good one!
Well even with a turbo that supposedly needs xx minutes of idling, One can
still start and drive a car slowly, with the engine just above idle. My bet
is aftermarket companies playing it safe... and rather than explain detail,
it's easier to just say idle car for xx minutes.
Oil pumps in car are positive displacement. Meaning they pump a set flow of
oil, viscous or not. That's why when the engine starts, oil is being pumped
into bearings almost instantaneously. (but I personally would wait like at
least a second or two before moving the car, adding load or reving it.)
Now obviously the oil line branches, some oil here some oil there, one oil
line to the turbo. If the line to the turbo isn't done correctly, if
the resistance is too high, then the oil will rather flow elsewhere, down
another less resistive branch. But this is a design or install problem, not
a viscosity/ oil warm up issue... since the oil is cold everywhere
initially. One can imagine all the problems that have occurred in the past
and thus the "knowledge" that gets passed down... but yeah I would tend
towards playing it safe too... (and drive the car slow for awhile !)
2009/2/25 Brian Mitchell
> One of my friends also told me that the muffler bearings need to warm up a
> bit so that they don't seize up. Considering the large aftermarket muffler,
> I would assume that it contains more muffler bearings, so would need to warm
> up longer.
> On Feb 25, 2009, at 6:20 PM, Like toPedal wrote:
>
> a friend of mine builds drag racing Subaru WRXs and Toyota Supras. i asked
> him and he said
> "The primary reason you want to let the car warm up is so that you make
> sure you have sufficient oil in the turbo. Its not really a requirement,
> but I never drive any of my turbo cars without letting them get up to
> operating temperature. Oil starvation can lead to premature wear of the
> bearings and shorten the life of the turbo. You don't really "have" to warm
> it up, but its a good thing for people who actually care about their cars."
>
> so your neighbor might drive his drag WRX to work everyday....and he needs
> that turbo to last
>
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Now I am feeling bad because he is just taking care of his car.
Of course if he just moves it elsewhere then the problem is solved.
Whatever the resolution turns out to be, I will let everyone know. I greatly appreciate all of the suggestions (everything from potatoes to sardines taped to the underside of the car).
With many sincere thanks.
Dave
-----Original Message-----
From: Brian Mitchell
Date: Wed, 25 Feb 2009 18:23:52
To: Like toPedal
Cc:
Subject: Re: [OBRA Chat] turbos
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Technically a turbo can accurately be thought of as a centrifugal
muffler (although that is not its primary purpose). And it does have
bearings.
But seriously, as someone with experience building racing turbo charged
engines my opinion is that turbo warm up requirements are no different
than that of the rest of the engine. If the turbo oil system is
properly designed in the first place there is no reason prolonged
idling is going to make any difference.
Rick Johnson
Bend, Oregon"I'd rather eat domestic salmonella than Chinese melamine."
One of my friends also told me that the muffler bearings
need to warm up a bit so that they don't seize up. Considering the
large aftermarket muffler, I would assume that it contains more muffler
bearings, so would need to warm up longer.
On Feb 25, 2009, at 6:20 PM, Like toPedal wrote:
a friend of
mine builds drag racing Subaru WRXs and Toyota Supras. i asked him and
he said
"The primary reason
you want to let the car warm up is so that you make sure you have
sufficient oil in the turbo. Its not really a requirement, but I never
drive any of my turbo cars without letting them get up to operating
temperature. Oil starvation can lead to premature wear of the bearings
and shorten the life of the turbo. You don't really "have" to warm it
up, but its a good thing for people who actually care about their cars."
so your neighbor might drive his drag WRX to work everyday....and he
needs that turbo to last
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That could be the situation. Then that means he should park it elsewhere to let it warm up instead of disturbing the neighbors.
Thank you for asking about that.
Dave
-----Original Message-----
From: Like toPedal
Date: Wed, 25 Feb 2009 15:20:28
To:
Subject: [OBRA Chat] turbos
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One of my friends also told me that the muffler bearings need to warm
up a bit so that they don't seize up. Considering the large
aftermarket muffler, I would assume that it contains more muffler
bearings, so would need to warm up longer.
On Feb 25, 2009, at 6:20 PM, Like toPedal wrote:
> a friend of mine builds drag racing Subaru WRXs and Toyota Supras. i
> asked him and he said
> "The primary reason you want to let the car warm up is so that you
> make sure you have sufficient oil in the turbo. Its not really a
> requirement, but I never drive any of my turbo cars without letting
> them get up to operating temperature. Oil starvation can lead to
> premature wear of the bearings and shorten the life of the turbo.
> You don't really "have" to warm it up, but its a good thing for
> people who actually care about their cars."
>
> so your neighbor might drive his drag WRX to work everyday....and he
> needs that turbo to last
>
> _______________________________________________
> OBRA mailing list
> obra@list.obra.org
> http://list.obra.org/mailman/listinfo/obra
> Unsubscribe: obra-unsubscribe@list.obra.org
a friend of mine builds drag racing Subaru WRXs and Toyota Supras. i asked him and he said
"The primary reason you want to let the car warm up
is so that you make sure you have sufficient oil in the turbo. Its
not really a requirement, but I never drive any of my turbo cars without letting
them get up to operating temperature. Oil starvation can lead to premature
wear of the bearings and shorten the life of the turbo. You don't really
"have" to warm it up, but its a good thing for people who actually care about
their cars."
so your neighbor might drive his drag WRX to work everyday....and he needs that turbo to last
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