XYZER Hollow Dipper failures out there?

[cujet]

What size dipper broke? What RPM?

I am using the 2 inch style at 800RPM.

[JohnF]

2" dipper, 650 rpm.

[BruceM]

That makes me nervous about a solid top bearing and a 3" hollow dipper.  A dipper failure would mean engine destruction.

[quinnf]

A couple of years ago, a number of us had a discussion offline about some of the features the British listers incorporated in the earlier models.  One was a hollow dipper slurping oil out of the sump through a slot in a sheet metal "splash plate" that appears in a number of the earlier manuals.  You can see a drawing of it on page 39 of the 3/1, 5/1, and 10/2 manual on John Ferguson's website. 
http://www.woodnstuff.ca/images/pdf_files/dursley.pdf  And someone else posted a colorized version of another manual on one of these fora that also shows the splash plate. 

But for some reason, the hollow dipper idea came and went, in favor of the solid dipper and open, uncovered sump.  It would be interesting to know what some of our British aficianados might be able to glean from their contacts in the UK. 

Quinn

[cujet]

In my case, I am not running a solid top bearing. But rather, a standard top bearing with the addition of the drilled dippers (twin). I may want to use the oil pump to squirt oil towards the rods too. That would be an easy thing, as the oil gallery is in the proper position and could easily be fitted with jets.

[akghound]

I am happy with the dippers I have. I once let the oil get so low that the rod didn't splash through it but the dipper still hit in the oil. When I recently pulled the rods off the crank the bearings were still in good shape. However this discussion makes me think about the scoop type of tin dippers that were in the old Chevy 6 cylinder engines, like the old 216's of the '50s. Remember they would actually build something like 25# of pressure. They worked pretty good.
Ken Gardner

PS.. XYZER
When I hit it with the wrench it just snapped off. I don't think it had a chance to bend.

[mike90045]

Are the connecting rods drilled for oil ?  what oils the upper bushing/wrist pin ?  Just splash oil, and is that enough to cool the piston too ??

[mobile_bob]

Slash lube of the upper pin and bushing is more than adequate, as is piston cooling
the power density is so low in the lister/oid that piston cooling is of no concern

bob g

[vdubnut62]

akghound, the old chevy's did have an oil pump in addition to the dippers. The pump covered the cam bearings and the valve train
in addition to filling the dipper trays. The rods ran poured babbit bearings and were scraped and shimmed
Ron

[BruceM]

There is a considerable "trail" of oil coming off of the crank as it spins around. This provides much oil flung up inside the piston.

The technicians in Rajkot tested this oil flow on my engine by putting a gob of greasy casting sand underneath the piston crown where it couldn't be found without removing the conrod and wrist pin.  Sure enough, casting sand was slowly washed out by oil during running, thus proving the adequate oil flow for the conrod small end and also piston cooling.