BMW R7 Motorcycle Engine

[gbravo]

I introduce my engine, is replica of BMW R7 Motorcycle engine in 1/4 scale.
The two cylinders boxer engine with bore 20 mm, stroke 18 mm, spark plug.

 

[dsquire]

gbravo

This looks like an interesting little engine. I will be following along as you bring it to life. :bow:

Cheers

Don

 

[gbravo]

This is the first set of pictures
The Crankcase

 

[gbravo]

More crankcase

 

[Chitownmachine]

Looks great!!! Can't wait to see it come along!

 

[moanaman]

Will be following this with great interest. Love boxer engines. Drive a Subaru or my wife does. didn't realize it was was as simple as it seems in design. Did you make a casting or did you mill from a billet?

Barry G

 

[metalmad]

Mate this is just brilliant, I love it ,show me more :big:
Im thinking of doing a twin for my next engine ;D
will be following along for sure
Pete

 

[BillC]

This is an excellent project!! - the photo may relate why I feel that it is... My favorite ride!

 

[Dave G]

Very nice engine gbravo, can't wait to hear it run. Dave

 

[gbravo]

BillC,
This bike is exactly the same engine, R1000/7.

 

[gbravo]

Sorry R100/7

 

[halvoric]

Awesome. I want to build a scale R60/2 or R69S engine--you have beat me to it. Watching with great interest.

 

[RManley]

Yey, another motorbike engine Looking very nice so far!

Bookmarked and will follow with interest.

Rob.

 

[steamer]

That's a great looking bit of machine work! Keep it coming!

I think this was asked...is that from billet or from a casting?

Tool marks seem to indicate billet....but I could be wrong.

Dave
:bow:

 

[metalmad]

Looks like a nice big block of alli in a CNC to me
great work
Pete

 

[Brass_Machine]

That is my question... carved from a solid chunk??

Very nice btw!

Eric

 

[gbravo]

Yes, is machined from solid bar in home made CNC machine with 4 axis.

 

[gbravo]

Now the timing case

 

[Brass_Machine]

Wow... that is coming along very nicely. Excellent work so far!

Yes, is machined from solid bar in home made CNC machine with 4 axis.

I would like to see what your CNC is about. Would you mind sharing some pictures/info on it?

Many Thanks!

Eric

 

[gbravo]

Eric,
My machine is a Grizzly Mini Mill Sieg X2, modify to CNC with the following home made main upgrades:
Reinforced colum and new balance system.
Grinding Dovetails and taper Gibs
Ball screws with back to back ballnuts leadscrews in all axis.
Stepper motors, Keling Technologies KH23H2100 with 570 oz/plg
CNC software Mach3
Control Drives Gecko-Drive
4th axis with harmonic gear and stepper motor.
All of this has been made in my home with my own design.

I will take some picture for show my workshop.
German