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Oil pressure probs
Sorry Patrick, have to side with Raffi on this one.
One vote for thicker oil = more pressure.
Rick Alexander
----- Original Message -----
From: "Euroroc II" <flaatr@yahoo.com>
To: "ATS - Patrick Bureau" <txrocco@sbcglobal.net>; "John Lagnese"
<jlagnese@massed.net>; <scirocco-l@scirocco.org>
Sent: Monday, March 10, 2003 3:27 PM
Subject: RE: Oil pressure probs
> Your logic still confuses me... a worn pump means that the clearances have
> widened... which means the pump can no longer build the same amount of
> forward pressure since oil can bleed back... thinner oil, more bleeding
> therefore lower forward pressure. If you use heavier oil and you have low
> pressure then you have a more serious problem like oil passages clogged
up...
>
> Think of it this way...
> Cold motor in the morning equals thick oil... idles at about 4.5Bar.
> Warm motor after a run on the freeway equals thinner oil... idles at about
> 1.5Bar.
>
> Thicker oil to start means higher pressures cold and warm, thinner oil to
> start equals lower numbers... I don't run 10w40 in the summer months for
> this very reason. Too thin for hot weather and I have the total overkill
> oil cooler.
>
> If we were to follow your logic then the pressure would go to like 9Bar
> once the motor warms up... not good.
>
> I know this is far from begin scientific, but I know I am right.
>
> Anyone want to share their $0.02 worth of knowledge...
>
> -Raffi
>
>
> At 01:24 PM 3/10/2003 -0600, ATS - Patrick Bureau wrote:
> >all I am saying is that if you have 20w50 in your engine and your oil
> >presure light come on, and you swap oil to 10w30 (thinner therefore
easier
> >to be moved inside engine) and the light goes out, your problem is your
oil
> >pump being close to shot. this is how I diagnosed my problem and it
proved
> >me right. the pump bearing was dead once I took it out (1/10" movement
> >sideways on the shaft and grinding noise when turned with a drill)
> >
> >Oil pressure sender guages the amount of oil pressure hitting it (no
matter
> >what thickness oil is..) if 20w50 (thick) does not pressurise the oil
> >properly inside the engine because the pump is unable to push the oil all
> >the way up the head, when putting 10w30 (thin) the pump is able (easier)
to
> >make the oil reach the top of the engine why the light would go out.
> >
> >I know this is far from beign scientific, but I know I am right, I have
> >tested numerous oil pumps this way and they have always proved me correct
in
> >my thinking and in the need of replacing the pump (versus a faulty
sender)
> >
> >once I replaced the pump and put 20w50 back in the car the oil did 5 secs
on
> >oil change and never came back on.
> >
> >I am not being smuge about this, just stating what my experience is.
> >
> >
> >ATS - Patrick Bureau - txrocco@sbcglobal.net
> >
> >
> >=>-----Original Message-----
> >=>From: scirocco-l-admin@scirocco.org
> >=>[mailto:scirocco-l-admin@scirocco.org]On Behalf Of Euroroc II
> >=>Sent: Monday, March 10, 2003 1:06 PM
> >=>To: ATS - Patrick Bureau; John Lagnese; scirocco-l@scirocco.org
> >=>Subject: RE: Oil pressure probs
> >=>
> >=>
> >=>Strange logic... Usually if you have low pressure problems you
> >=>run heavier
> >=>oil not lighter.
> >=>
> >=>My take is thinner oil makes lower pressure in worn pump...
> >=>
> >=>Anyone want to back me up on this?
> >=>
> >=>-Raffi
> >=>
> >=>At 05:17 AM 3/10/2003 -0600, ATS - Patrick Bureau wrote:
> >=>>no it make perfect sense, it is more difficult for the oil pump
> >=>to shuffle
> >=>>20w50 than 10w30, thus the oil pressure dropping and the sender
> >=>turning on.
> >=>>
> >=>>ATS - Patrick Bureau - txrocco@sbcglobal.net
> >=>>
> >=>>
> >=>>=>-----Original Message-----
> >=>>=>From: Euroroc II [mailto:flaatr@yahoo.com]
> >=>>=>Sent: Monday, March 10, 2003 3:53 AM
> >=>>=>To: ATS - Patrick Bureau; John Lagnese; scirocco-l@scirocco.org
> >=>>=>Subject: RE: Oil pressure probs
> >=>>=>
> >=>>=>
> >=>>=>That doesn't make a lot of sense, 10w30 is thinner than
> >=>20w50... isn't it?
> >=>>=>
> >=>>=>-Raffi
> >=>>=>
> >=>>=>At 12:08 PM 3/9/2003 -0600, ATS - Patrick Bureau wrote:
> >=>>=>>depends on the temperature outside and what oil he is using,
> >=>I had this
> >=>>=>>issue when running 20w50, but dropped it at 10w30 and it went
> >=>>=>away, but it
> >=>>=>>was summer time, and this indicated the need for a new oil
> >=>pump, did the
> >=>>=>>swap for a new one, and 20w50 in the engine and it all go
> >=>away. now I am
> >=>>=>>unsure what oil for summer time the OEM specs call for on a
> >=>>=>Jetta... but the
> >=>>=>>diagnosic of it remains the same... could be as simple as a bad
> >=>>=>contact on
> >=>>=>>the oil pressure sender too.
> >=>>=>>
> >=>>=>>
> >=>>=>>ATS - Patrick Bureau - txrocco@sbcglobal.net
> >=>>=>>
> >=>>=>>
> >=>>=>>=>-----Original Message-----
> >=>>=>>=>From: scirocco-l-admin@scirocco.org
> >=>>=>>=>[mailto:scirocco-l-admin@scirocco.org]On Behalf Of John Lagnese
> >=>>=>>=>Sent: Sunday, March 09, 2003 11:58 AM
> >=>>=>>=>To: scirocco-l@scirocco.org
> >=>>=>>=>Subject: Oil pressure probs
> >=>>=>>=>
> >=>>=>>=>
> >=>>=>>=>Hi,
> >=>>=>>=>One of my teaching colleague's Jetta III 8V is having an oil
> >=>>=>>=>pressure prob.
> >=>>=>>=>After 1/2 hour on highway there is a few seconds to 20
> >=>seconds of oil
> >=>>=>>=>pressure light. Oil level is ok. Car is just under 100K.
> >=>>=>>=>John
> >=>>=>>=>
> >=>>=>>=>
> >=>>=>>=>_______________________________________________
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> >=>>=>>
> >=>>=>>
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> >=>
> >=>
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