Engines > From Plans

GDB Inline 4 Cylinder OHV I.C.

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90LX_Notch:
My next build has begun.  It is George Britnell's Inline Four Cylinder Over Head Valve Internal combustion engine. 

This will be a long term build due to work and kid related activities.  If updates are sparse please inquire with a post.  It helps me to find shop time knowing that someone is following along.

Engine Block:

The block is 6061 Aluminum and was first squared.

Somehow the pictures of the more difficult side are not on the camera.  I was stumped for awhile as how to get the .062 radius that is called for at the bottom corners and transitions.  My .125 ball endmill did not have the required length of cut.  I finally realized that if I angled the mill's head at 45 degrees I could machine and blend the required radii. 

Fortunately, I do have the pictures for the easier side.  I scribed the necessary lines and began to whittle away at the block.  Once the required angle was roughed, the engine block was transfered to a fixture plate that allows it to be set for angles in the mill's vice.  This particular angle fixture design came from one of the contributors of the "Shop Made Tools" thread at  Home Shop Machinist.  Once the angle was set the the block was indicated and clamped to the fixture with c-clamps. 

Once both sides were machined I started to do some hand blending with sandpaper and stones.  I still to do more blending but will hold off until the engine block is completed.

-Bob

90LX_Notch:
More pics

b.lindsey:
Good start on the block Bob. I will be here for the duration, no matter how long it takes :)

Bill

90LX_Notch:
Thanks Bill for jumping onboard. 

I'm excited for this build.  This is such a cool little engine.  I was blown away by George's video of it when I started in this hobby nine years ago.  We all marvel at George's work; but, to actually build one of his engines to print, really opens one's eyes to just how skilled he is.  To say it's humbling is an understatement.  My skills are going to get pushed beyond their limit.  But, that is the only real way to build skills.

-Bob

Tennessee Whiskey:
 :popcorn: and  :DrinkPint: in hand: Iíll ride along too Bob.

Eric

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