Engines > From Plans

Len Mason's "Mastiff" - chewed from the solid

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deltatango:
Hi All,
This is the start of a build log of my attempt at Len Mason's Mastiff, a 4-cylinder horizontally opposed engine of about 25 cc. I've chosen to do without castings, partly because of cost but mostly because I like carving metal. I also wanted to know how much extra work there really is doing it this way compared with making jigs and setting up castings.

As a start I redrew the whole engine in 3D using Geomagic Design and made necessary changes to the crankcase and other parts, also changed all threads to metric. Here is the external appearance of the engine as modified:



and some sections:



Kirk Burwell at Hemingway Kits kindly put together an anything-but-the-castings kit of parts which will save a lot of time sourcing bits and pieces:





The picture also shows two kits each for a pair of home-made spark plugs, I have no experience with these, so I have my fingers crossed.

The Al blocks came from the local suppliers' odds-and-ends shelves:



The crankcase was already completed before I found this forum, but I put this in the picture for completeness. The jpegs exported by Geomagic Design are rubbbish so I've attached the same pictures as pdf files.

I'll show progress on the crankcase in the next post.

DT

BronxFigs:
Looking forward to seeing the building of this  engine.  Wishing you a successful outcome for all your efforts.

Frank

deltatango:
Thanks Frank, I really appreciate the good wishes!
DT

philjoe5:
A very ambitious project - best of luck and success with it. 

Cheers,
Phil

Dave Otto:
Looking forward to following along with your build.

Dave

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