Mercedes-Benz W165 Grand Prix engine in 1:3 scale

[Vixen]

Hi Dave,

Thanks for calling in.

The crankshaft will be the next major assembly to attempt. Need to finish the cam drive stuff first.

The thing to the right of the two blowers is the oil filter. It's part of the blower gearbox casting. It filters the scavenge oil from the engine and sends it through that flexible hose to the oil cooler and then back to the tank. The flexi hose, on the model, has been pushed into a convenient gap between the two blowers, it does not belong there.

Mike

[ddmckee54]

I remember hydraulic filters similar to that being used on some Swiss built lathes that I worked on almost 40 years ago, they were very neat.

Did you make the mechanical filter functional, or is the filter housing just used as an oil passage?  That would be a LOT of work to make it functional.  And even if it's a fake filter, it looks very good.

Don

[Vixen]

Hello Don,

I wonder how many other members recognised the oil filter as being an edge filter, rather than a normal cartridge filter.

No, I have not put any mechanical filter discs inside, it is so much easier to replace the oil in the tank with clean fresh oil. Do not look upon it as a fake, think of it as being a 'full flow' filter. 




In an edge filter, the oil is made to pass through several closely spaced discs which are alternately stacked on the center spindle, as well as the filter housing; as shown above. The clearance or gap between two successive discs is a few microns. The oil passes through the small spaces between the discs and any impurities are trapped by the disk periphery and edges. The trapped impurities can removed periodically, by operating the central knob.

Mike

[Laurentic]

Just catching up on this thread so apologies Mike to refer back to Reply#577, but the photos on that reply show stunning pieces of work Mike, that beer, preferrably two, was well deserved, superb.

Chris

[crueby]

I wonder how many other members recognised the oil filter as being an edge filter, rather than a normal cartridge filter.

Not me - never heard of one before. That is a pretty clever method. When the knob is rotated, where does the trapped impurities go? Not back into the oil output line and into the engine?   
Chris

[Vixen]

I wonder how many other members recognised the oil filter as being an edge filter, rather than a normal cartridge filter.

Not me - never heard of one before. That is a pretty clever method. When the knob is rotated, where does the trapped impurities go? Not back into the oil output line and into the engine?   
Chris

The sludge remaines inside and accumulates in the spaces between the filter plates. It was necessary to dismantle the whole filter, once in a while, and wash the parts in petrol. I believe the edge filter was chosen because of the castor oil used to lube the engine. Castor oil can go gummy when overheated or contaminated by the dope fuel they used. The edge filter does not clog up with gum and sludge as easily as a paper filter.

Mike

[90LX_Notch]

Mike-

I’m speechless.  Engine porn at it’s finest.

-Bob

[ddmckee54]

The sludge remaines inside and accumulates in the spaces between the filter plates. It was necessary to dismantle the whole filter, once in a while, and wash the parts

That's why I remember them.  I had to repair a hydraulic tracer lathe that wasn't working correctly.  We tracked the problem back to a dirty hydraulic filter, and rotating the cleaning handle didn't help.  I had to take the filter apart, clean it with solvent, then reassemble the filter - that's not EXACTLY a 5 minute job. (Even if I did cheat and put the filter parts in their industrial sized ultrasonic cleaner.)  Meanwhile the lathe operator was standing around looking over my shoulder and waiting for me to get the lathe fixed - so HE can start making some money by making parts.

Don

[Elam Works]

Have an edge filter on two of the engine lathes. However the flow on those is from the outside to the inside. The tee-handle rotates a scraper that wipes around the outside of the stack, scraping off the sludge and debris.

-Doug

[Vixen]

From the edge filter discussions back to the engine build. It's back to business as usual, in Vixen's Den.

You will recall I had made a start on the outer covers for the camshaft gear train. The plan is to machine the gear covers, two at a time as they are both identical. A start was made by machining the interior pocket shape in a large 19 mm thick slab of 6082 T6.

Next, the the billet was turned right side up and a new material datum point established at the bottom left corner of the material. The top surface was machined in a series of operations until both the upper surface and outside guitar like shape had been created.











Next came the outer edge rounding. The outer edge 5.5 mm radius was created by milling a series of waterline profiles. Here you can see the toolpaths and the resulting 5.5 mm radius on the work itself. The rounded profile was cut using a 7.0 ball ended cutter which resulted in fifteen equi spaced facets, each a little under 0.5 mm wide.







The next operation was to part off the two covers from the stock, using a 6 mm end mill. You can now see the reason for the 13 mm diameter pillar, which was used to support the centre part during the outside machining operations. Then it was a repeat process for the other two covers. Lots more chips were produced as the 19 mm billet was reduced to 2mm thick shells.






Here you can see the outer covers resting loosly in place over the big cam shaft gears. There is still a lot more drilling and tapping and hand fileing required before these parts are complete. But that's for another day.





Thats all for this installment, but stay tuned.

Mike

[crueby]

Definitely staying tuned!
 

[steamer]

Worked a lot of hours this week, sorry....but following along, while I'm in the "steam box"....

 

[Kim]

The gear covers look amazing (as does the rest of the engine)! 

Kim

[Craig DeShong]

The gear covers look amazing (as does the rest of the engine)! 

Kim

I'll second that!   

[scc]

Me too      Terry