some old racing engines

[absmiami]

The GTO engine has what appears to be an oil pump at the bottom of the engine cover - but the early Colombo 12s did not have this feature - the bottom of the casting is ribbed - so I removed the pump housing and added the ribs with strips of .010 x .030 Evergreen strip … the Early engines also had what appears to be a housing at the forward end of the crankshaft bearing that mite be used to start the engine - not sure -  the Barchetta has a starter - but maybe some early race engines did not …

[absmiami]

Time for the valve covers  -  the early Colombo engines did not have ribs across the center - in fact the first bunch didn’t even have badging - but the Barchettas  had a small badge - the bolt pattern was the same - but the housings don’t stand away from the profile of the casting much … and the profile of the casting is a little different …

[absmiami]

Marked and drilled holes for .031 alu tube - RB Motion’s smallest cap nuts will fit into the tubing - more sanding and filing …

[Beamerman]

I love this thread...amazing work...

[absmiami]

Added the cap nut housings at the ends of the valve cover and added the cover for the timing chain case at the front - that was sawed off of the Reps and Mins valve cover - it has some very intricate bolt detail that would be very difficult to make … and used a diamond bur to open the hole at the back of the block and the valve cover - that’s for the magneto support base …

[absmiami]

Carb quandary:   The Barchetta used 3 Weber Down-draft carburetors - this was also standard for the Spyder Corsas and the early 166 Formula II cars ….  The UMI kit part began with masters for the carbs which were obviously intricate and very accurate - their source will probably remain a mystery - but the casting was not very precise - a lot of the carb detail was lost - I’m going to cut the castings in to three parts and see how much of the intricate detail I can recover - and I carved a groove into the casting so that the individual carbs can be slid into the cylinder head when I’m done - this will also open space in the top of the block for the plugs - the engine had “center” plugs -  entering the cyl head inside rather than outside of the cyl head -

[absmiami]

[absmiami]

Actually - this really cries out for a 3D printed Weber 40DCL carburetor. -   Just sayin …

[Pico]

On 11/15/2021 at 8:56 AM, absmiami said:

Actually - this really cries out for a 3D printed Weber 40DCL carburetor. -   Just sayin …

Come on, you can do it.

 

[absmiami]

Tears notwithstanding - this is a shot of the carbs on the Spyder Corsa ….

[absmiami]

First I sawed one Weber apart from the casting … the master clearly had a lot detail …

[absmiami]

Removed as much of the excess resin as I could - and replacing some of the master’s features - as much detail as I can stand - those small bolt heads are .015 RB Motion alu - that’s about as small as I will mess with  - actually Mr Bentley makes some stuff that is smaller - which goes to dark places …

[absmiami]

So after a while I’m staring at the Weber - and the Weber is staring back at me ….   so I took a break and made a plug wire loom from a strip on .060 Evergreen channel.  It’s close to scale - maybe just a little large - scraped the shape that I needed w an Xacto blade and drilled the plug wire holes and liquid glued the sucker to the valve cover - there is just enough space at the end for 6  .011  plug wires - opening might not be large enough for .013 wires - not sure …

[absmiami]

Timing is everything ….             Sotheby’s is auctioning a 1 of 6 250 GT Berlinetta  -  these pix were grabbed from the excellent Silodrome site ….  This car has the early Colombo engine that I’m making - differences are the ribbed valve covers and the up front magneto location - nice car !!

[absmiami]

Bitsandpieces …

 

 

[absmiami]

Your gratuitous 2:00 AM engine shot from Amelia … modified on the Becassa phone app …

[absmiami]

Going to see a man about  ….  a Miller. …

[absmiami]

Ok.  Back from my wanderings

the valve cover had a small badge - really small - not more than 5 inches in length -  

[absmiami]

Those were simpler times - Enzo wasn’t hiring marketing people to advise him on how to badge the engines - right ?

so the smallest photo-etch in my stash is designed for 43 sc kits - but it’s too big!  
now what (dramatic pause)  ??

[absmiami]

Global Toy to the rescue - they have an eBay storefront with LOTS of decals and metal marking sheets for auto and military modelers …

[absmiami]

The smaller badges on this sheet - they have over a dozen different sheets for Ferrari - are only about 5 mill in length - bingo - if I can figure out to use them - 

[absmiami]

The package says “metal decal”. But it’s really not … it’s thin metal covered by film that is removable once the badge is placed onto the surface the surface of the part- this is a trial run with large script …

[absmiami]

The operation is a success….  Using one of the smaller badges in the set - 5 mill in length - placed onto the valve cover - added a dab of CA glue - the adhesive on this tiny part needs a little help -  the badge is attached securely and will cast up nicely … 

[absmiami]

That was fun …

next part …

[Mattilacken]

Beautifull work as always!