"Blueprinting" the pumps normally consists of starting with a good housing and new set of rotors, cleaning up the internal passages, and setting the end float. BTW the end float on the aluminum housing pumps have to be set about .001 more than desired, the housing compresses a bit when it's torqued down!
Glen
--Previous Message--
: Thanks for the pictures Steve. Don't
: lurk! Post... I need all the help I
: can get and I do remember this stuff.
:
: I am surprised to see that you made the
: modification to a cast iron pump.
: Beyond Glen's description the only
: online mentions of it I found involved
: the aluminum pump bodies of the later
: 4-cylinders.
:
: Regardless, I understand what you are
: saying and that you didn't see a lot of
: improvement. The issue my 1500 is
: showing indicates that the block
: probably has excessive cam journal
: bearing clearance and the pump cannot
: deliver enough flow at low RPM to
: maintain "higher" pressures.
: The longer rotors of the 6-cylinder
: pump may provide increased volume (and
: therefore pressure) at low speed while
: a carefully adjusted relief valve
: should just return the excess oil to
: the sump when off idle. Will it be
: worth it? I may never know. If the
: oil pressure stays above 25 PSI or so
: in the spring and summer it probably
: isn't worth messing with.
:
: Perhaps with the full race engines the
: pump blueprinting also involved
: selecting from multiple rotors and
: housings for minimal clearances.
: Lacking a stack of pump parts I am
: resigned to using the few parts I have
: at hand. I should mention that my pump
: clearances were checked and endfloat
: adjusted... my 1500 pump just isn't
: delivering enough at idle for the
: component clearances elsewhere in the
: engine.
:
: Glen, the "noises" will
: indeed be separate threads if justified
: at all.
:
: Doug L.
:
:
:
: --Previous Message--
: Stock pump blueprinted worked fine in
: full race engines that saw 8500 rpm for
: years. I did try the GT6 pump mod and
: never saw a benefit. Whatever. Attached
: are pictures of that type of
: modification on an actual oil pump.
: Back to lurking...........
:
:
: http://public.fotki.com/jr2dad6888/oil-pump/11092014-002.html#media
:
:
: http://public.fotki.com/jr2dad6888/oil-pump/11092014-001.html
:
:
:
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