Freelance Inline Twin

[yogi]

Thanks guys!
Good idea for an engraving Steve. I will revisit the idea later when it's time for assembly...

Zee, I'm using my own version of a FogBuster coolant sprayer.

Yogi

[yogi]

To continue the work on the crankcase, The cover for the flywheel end is next.

This was a straight forward turning job, so it will be a relative short post.

First, I turned the inside:



The part was flipped over, to finished the outside:



..and the last operation on the mill to drill the hole pattern:



The finished part:






Stay tuned

[90LX_Notch]

Geez, I don't know how the heck I missed this thread until today.  What an awsome project.  You have my respect Yogi.  This is really a neat build.

-Bob

[b.lindsey]

Fine looking parts yogi!! It's going to be a fine looking engine too!!

Bill

[yogi]

Thanks for the kind comments Bob and Bill. Always appreciated! 

The next part for the engine are the connecting rods. The big end will have a needle roller bearing, and the small end a bronze bushing.

As for you guys that have been following this build already know, I'll be using the trusty soft jaws for this part again.

The first side is machined to the full depth plus a little extra. The stock is chosen to allow sufficient material to hold it in the vise.





A set of soft jaws was milled out, to hold the rods for the second side machining:



The extra stock is milled off and the rods machined to final thickness.



The finished connecting rods:



Thanks for following along, and stay tuned for more...
Yogi

[mnay]

Yogi,
I used that same method for similar parts.  It works great.  I did not think to mill some  soft jaws to hold it like that.  I learn something new everyday from the forum.  Thanks for posting.
Nice looking rods

Mike

[Dave Otto]

The rods look great Yogi!


Dave

[Art K]

Yogi,
I have to agree with everyone else, the rods look great. Did you bore the ID's to fit the bearings or do a circular interpolation?
Art

[yogi]

Thank you guys for the kind comments! 

Art, I used a circular interpolation to machine the ID's. The bearing has a slip fit and will be secured in the rod with adhesive.


Yogi

[toolznthings]

Looked even better in person !! Love it ! 

Brian

[yogi]

Thanks for the kind comment Brian! Much appreciated! 

Progress on the engine has slowed down to crawl lately, as work has been interfering with precious shop time...     

The cylinder sleeves are made, and ready to share with you guys.

The sleeves are turned from cast iron bar stock.
The first side is turned to size on the inside and outside:



After parting off, the sleeves are finished on the second side. The small shoulder will create a groove in the cylinder block for an O-ring.



Finish turned:



...and that's how they look installed in the cylinder block:



The finish in the bore turned out very nice, and was cylindrical within less then 0.01 mm. I contemplated to just leave it as is, just turned. But I decided to finish lap the bore. Since the surface finish was already really good, and the bore straight, the lapping took mere minutes to complete. (note the cling film on the lathe bed, to protect it from any lapping compound).





Thanks everyone for following along, and stay tuned for more...

Yogi

[steamer]

I like the looks of that Yogi!     Coming right along!


Dave

[Perry]

Hello Yogi, is that a Flexolap? If so how much undersize is the starting size vs nominal size and how much can it expand further?
Many thanks

[90LX_Notch]

Yogi it looks really great.  The cling wrap is a great idea.  I''m definitely going to use that one.

-Bob

[Brian Rupnow]

Very nice engine build and documentation. I have never seen crankshaft bearings set up like that either. Does the shaft which the con rod ends ride on have a head on it that is locked between the bolted together end assemblies? How do you ensure that all 3 large sections of the crank that are bearing surfaces of the crank stay "aligned"?  ---Brian