Originally posted by Error404
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20V CQ Tidy Up
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Originally posted by Error404 View PostThe washer puts more pre-tension on the relief valve spring, so it takes more oil pressure to force the relief valve open. Effect is the peak pressure is raised.sigpic
1991 Audi S2 3B - 2.5 Stroker engine
1997 A6 2.5TDi quattro avant - C4
1976 RD250E / 350LC cafe racer
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I was thinking about this earlier and I guessed the pump must begin to produce excess flow/pressure somewhere before the peak torque of the standard map? I guess that would be the point of the rpm range where most force was exerted on the bearings?Panthero Coupé quattro 20vt
Indigo ABY coupé
Imola B6 S4 Avant
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I dont know what pressure it peaks at as i've never plumbed a proper gauge in. But i suspect it opens instantly on a cold engine, or anything over 2000rpms on a warm engine. Or to put it another way if the dash pressure gauge pegs at 5bar, i would lay money its bleeding off excess pressure.91CQ20v - Gone to a new home
93UR-S4 - The Magic Carpet
94S2Bus - The Emerald Express
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It used to be fairly common practice to shim to get more oil pressure, a few engine building books still mention it.
Does vaseline just dissolve in oil then?Current-2004 Impreza PPP wagon
Sold-92 3B coupe-RS2+, 996s, konis, rear torsen, forged rods........
Sold ABY-stock
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Originally posted by andy10v View PostDoes vaseline just dissolve in oil then?Find me on Instagram @pry4sno
2010 Golf Sportwagen TDI /// #farmenwagen
2002 Dodge Ram 2500 24v Cummins 4x4
1992 80q 20v /// Eventual AAN'd Winter Sled
1990 Cq /// Project: Because Racecar
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Andy, same as I have seen - all of the blueprinting books I have read suggest shimming the relief valve spring to increase oil pressure and also to pack the pump drives with petroleum jelly for instant oil pickup. I'll measure this shim washer in a bit.
It will be an upgrade for 3B owners for sure, as its not there to begin withPanthero Coupé quattro 20vt
Indigo ABY coupé
Imola B6 S4 Avant
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Yup its petroleum jelly in both books I am reading just now.
Is the pressure relief valve otherwise identical on 7A/3B, they just shimmed in on AAN?
Something else to do then? Or as the car was fine previously don't ****** it about?Current-2004 Impreza PPP wagon
Sold-92 3B coupe-RS2+, 996s, konis, rear torsen, forged rods........
Sold ABY-stock
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