chad":3ouz2g6z said:
tryin 2 catch up on the process -
U covered the wood w/plastic?
That will be placed in the sand, B burned away by the melted ingots pored in?
How will U vent the expanding gasses of burnt plastic as they try'n escape out?
Will the wood B remover 1st?
This is a wooden pattern (that and bondo), in the last picture it is just been primed, I haven't quite finished it.
It is a split pattern, the parting line is near the top just below the carb flanges, it will be sand moulded and the pattern removed before being cast in aluminum, I will show some pictures once I get it mounted on the moulding board and the flasks built.
After the casting is done it will be machined on the carb mount surface and 6 bolts/screws will hold it on. If tolerances are tight enough I will use RTV to seal between the surfaces, if not I will probably bed the aluminum intake with high temp epoxy and then RTV.
I could probably say the pattern was done right now (good enough for sand casting) but I can be super picky about stuff and want to even some things up and I think I have one spot with negative draft on the top I need to fix.
I wish I had made an impression of the firing order cast on top of the intake before I ground it off because I think it would be neat to cast it on top of the flat between carb 1 and 2, make it look factory"ish" :roll:
I did plane off the top of the lower pattern today slightly to make the profile thinner in case I need to use the fiber spacer under the carbs, the valve cover side really only has to clear the fuel line connections and the only close one is the front where it runs close to the PVC valve.
I was wondering, is the port in the manifold, just below the carb, the PVC connection? (where I have the cutout on my pattern)
See Ya,
Mike