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Yes, i use vacuum assist and wow what a difference it makes :) i used to just do straight gravity pours. They work out ok with heavy materials like bronze, but aluminum really suffered. Using vacuum assist has been the biggest improvement with the surface finish of the castings.

looks like 700 to 750 c to me :) Thats furnace temp,not element temp.

Why is that? I directly investment cast pla plastic from extrusion based printers all the time and have good luck doing it. Ive also investment cast plastic parts from sls nylon that works out very well also. The small cores for the exhaust ports could prove challanging using plastic patterns...

And how much resolution does a casting need?? Good luck with whatever it is you are looking for.

Another option would be machining pieces from wax then building the assembly in wax for casting.

I am fairly certain I could print it, although I do quesition how well I could cast it. Im not sure if my cad program will let me make many changes to the assembly, thats why I asked it to be split. Maybe I could do something with it as an stl file but that would be pretty limited as well. I...

I try to be......but sometimes people just dont get my dry sense of humor....

5.5" long = large ??? roflmao I am truely blessed.....LOL seriously though, before you try casting it let me know. There are some things that just wont happen with the lost pla casting..

Flat 32, could you slice the block in half thru the mains and send it to me? I would like to try printing it out and then investment casting it using the lost pla method, or maybe lost wax if I can get it to print ok in the machinable wax filament.

not a project for the faint of heart thats for sure....

Im on vacation this week and had plans on modeling the engine in cad then cam, but so far i havent even turned on the lap top. The campfire has been keeping my attention until its time for lights out so far, but i do hope to get on it soon. Im still not sure about starting a build though...

Yea, Im kind wishin I hadnt cut the notch out :( oh well too late now.... Did some playing with the cnc mill and worked on finishing off the valve chest thingie, just a couple more holes to drill. Still learning how to use the cam software but having more computer time than shop time it works...

Riogrande.com or contenti.com Pretty easy to fabricate most of what you need, but easier to buy some things like the vaccum flasks.

OH Great! something else I need to put on the to do list....:wall:

Dang, shes a beauty.

Pla will dissolve in water, in about 100 years give or take. The problem i see is the plastic to metal ratio of the filament. Its unlikely they can get over 40% metal fill and have a printable material. Most metal fill filament s produced currently are only about 20% iirc.

Hmmm, interesting......first instinct. ....snake oil......but ill try anything once.

Devcon stainless steel epoxy....

http://www.cdcotools.com/ Look under lathe tooling....

AH HA Found what you need to see... http://www.homemodelenginemachinist.com/showthread.php?t=19073