Date: Wed, 12 May 2021 09:37:08 -0600
Reply-To: OlRivrRat <OlRivrRat@COMCAST.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: OlRivrRat <OlRivrRat@COMCAST.NET>
Subject: Re: Cold start oil pressure
In-Reply-To: <1B8A51E9-6485-4923-8FE6-274FC1F66374@shaw.ca>
Content-Type: text/plain; charset=utf-8
Air is said to be 10,000 times more compressible than oil ~ In any Hydraulic Line, if there is an
Air Bubble Between the Oil & the Device It needs to move, the Air will get Compressed Rather Than the
Device Getting Moved ~ It’s what makes Hydraulics so much more Efficient that Pneumatics ~
Easily understandable example > What effect does an Air Bubble in Your Vans Brake Lines have on
Your ability to Apply Necessary Force to the Brake Cylinders ~
Of course it there is an Air Bubble trapped between the Oil in an Extension Tube & a Pressure Sensor
@ the end of that Tube it can easily be gotten rid of by simply Carefully Loosening the Sensor while the Eng’
is Running thereby allowing the Air to be forced out & replaced by the Oil ~
ORR ~ DeanB
> On 12 May , 2021, at 1:10 AM, Alistair Bell <albell@SHAW.CA> wrote:
>
> I’m slow.. I don’t see how an air bubble will affect it much. Oil presses bubble, bubble presses sender.
>
> Just like a tire gauge :-)
>
> Alistair
>
>
>
>> On May 11, 2021, at 10:38 PM, OlRivrRat <OlRivrRat@comcast.net> wrote:
>>
>> They will work just fine as long as You Can Avoid getting an Air Bubble between the
>>
>> Sender & the Fluid ~
>>
>>> On 11 May , 2021, at 11:11 PM, Alistair Bell <albell@shaw.ca> wrote:
>>>
>>> I’d like that explained to me. I mean the problem of having an oil pressure sender on a tube.
>>>
>>> I’m not being coy, I mean it. Purely mechanical oil pressure gauges are at the end of a tube, why not an electrical sender?
>>>
>>> Alistair
>>>
>>>>> On May 11, 2021, at 9:42 PM, OlRivrRat <OlRivrRat@comcast.net> wrote:
>>>>
>>>> IMHO, placing a Sender/Sensor, be it Pressure or Temp, @ the end of a Dead End Tube
>>>>
>>>> is a Very Bad Idea > In the case of a Temp Sensor it could be next to impossible to get Fluid
>>>>
>>>> to it that is Relevant & in the case of Pressure,, If You happen to end up with an Air Bubble
>>>>
>>>> Trapped Between the Fluid & the Sensor You Most Probably May Not get Accurate Readings ~
>>>>
>>>> ORR ~ DeanB
>>>>
>>>>> On 10 May , 2021, at 9:43 PM, Gene P <olgreywoof@GMAIL.COM> wrote:
>>>>>
>>>>> Hey folks,
>>>>> 87 Wolfsburg 2.1, original everything
>>>>> I don’t think this is a problem, I’m just wanting to learn something.
>>>>> For years I’ve had VDO oil pressure and temp gauges, senders on a sandwich adaptor at the oil filter. Start-up pressure has been just under 80, right at the top of the gauge, in any season.
>>>>>
>>>>> As part of a recent project, I pulled the sender between the pushrod tubes and put that with the VDO sender on a tee about 7 inches forward of that port. Now start-up pressure is about 55-57. Would moving the sender in that manner cause a change, or that much change, in the reading?
>>>>>
>>>>> The other change I made (burying the lead I think) is switching from Castrol 20W/50 to Mobil1 15/50 for the first time. Does synthetic oil make that much difference in start-up pressure?
>>>
>>
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