BC

GlenL

Geba geba hey!

SeanR

V2Rocket

"variable geometry turbine"

dr bob

Issue is at the rear of the impeller where the mechanical seal depends on a "true" face for sealing. Looks like the guy who drilled the hole for the shaft gave his seeing-eye dog the afternoon off.

Reality: If that inner surface is square with the shaft, and the impeller doesn't hit the block, technically this pump is "fine". The thrust variations will be minor but will potentially shorten the life of the bearings. The normal uneven load on the bearings from the belt will take them out long before the varying thrust load will have any effect.

It would be a great project to casually design and 3D print "perfect" water pump impellers. No way to make glass-reinforced nylon pieces by that method, but maybe there are strong-enough materials available. Something softer than the aluminum scroll, smoother than the cast-iron, with a way to pin it to or otherwise index it the shaft. And not shed vanes while running.

Mongo

And they are mainstream pump makers for us now?

Crazy..

Ducman82

VRWP (variable rate water pump? )

GT6ixer

Markforged printers do exactly this, which is to embed carbon fiber filament inside nylon. The parts have a higher tensile strength than aluminum. That being said I don't think you could print the impeller blades with one of these printers since there is a minimum thickness needed for the CF to be laid down, which I believe is greater than the blade thicknesses. SLS printed parts may be strong enough. What material are the plastic imbellers made of currently?

V2Rocket

...drill a hole in the impeller at the shaft and plug-weld it?

or have a one-piece impeller+shaft unit made retained on the other side of the bearing by a C clip or something.

dr bob

More realistic is CNC steel impeller, shrink-fit (maybe with TIG tack weld) or keyed on a steel shaft that fits in a sleeve inside roller bearings. The mechanical shaft seal is a challenge, because it needs to go between the back of the impeller and the housing to protect the bearings.

Consider also that the impeller can fit over a keyed or indexed (with flats...) shaft, held on to the shaft with a nut or a bolt. That makes it possible to change the seal and the bearings, keeps the bearings in position against shoulders or snap-rings in the housing, with no chance of shaft or bearing migration. Industrial process pumps are designed like this, by the way.

BC

I would have thrown these but I kept them in case I decide to get a motor protector one from ed and these would be the cores.

Mongo

Roger managed to talk Laso into making pumps still for the 928. If they decide to quit again, and we are left with these garbage builds, an E-ROD LS3 is looking WAY more tempting as a long term motor rather than maintaining the original.

GregBBRD

​​​​​

Leading Edge Trailing Edge Theory or LETET as we refer to it.

Reduces water noise from the impeller by a huge amount.

Super secret nuclear submarine stuff.

skpyle

polecat702

Buy a new Porsche pump, or Ed's Guardian. Forget about all the other cheap crap out there.

For the record, I have a Guardian pump installed in my car. I like Ed's pump better, that's why I bought it. If it wasn't available, I would have bit the bullet and bought a new Porsche pump.

You,ve got to remove the interior in the Pantera to change out a water pump. It's a PITA, to change, but nothing like doing a WP/TB job, in a 928. I don't like having to do something twice, cause I didn't spend the money, and bought cheap parts.