Re: [T3] Full flow to Go?

["Jim Adney" <jadney@vwtype3.org>]

On 7 May 2001, at 21:10, Keith Park wrote:

> Jim... have any of your full flows gone to 100K without the oil light
> flickering??

Sure, but ALL of these cars do full flow or not. My bone stock 73 
has a virgin engine with 100kmi on it right now and it flickers every 
once in awhile. If I would just change the oil and/or top it up, that 
would go away.

> The 28PSI is with 30wt at temp (158F) and 2500 RPM... when cold it
> easily pushes 60 on even old engines and at highway speeds (3400RPM)
> the new engines run around 40.

The cold data is pretty misleading, so we're best off just sticking 
with the warm, keeping in mind that there are different degrees of 
"warm."

You can just look at the relief valve design and see what it is 
supposed to do. It will spill off oil as soon as the pressure exceeds 
the trip point of 28 psi, regardless of the RPM. The problem arises 
when the flow rate exceeds the capacity of the relief valve, then the 
relief valve stops helping and the pressure can climb again. I think 
this is just what VW decided to live with, not that it was designed 
to do that.

If I were worried about this I would machine the relief port to allow it 
to flow better without tripping earlier. This would be simple, just 
requires that you machine a larger hole with its top edge no higher 
than the original.

-
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Jim Adney, jadney@vwtype3.org
Madison, Wisconsin, USA
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