[IDEA] resin bond sand

[the artfull-codger]

(09-20-2013, 08:39 PM)oldgoaly Wrote: Well after umpteen years of wondering how I'm going to make these heads, resin bond sand is what the big boys use. Just an idea to throw out there see if anyone salutes or fall over laughing.....
what about using sodium silicate aka water glass. cure it pull pattern?

Here are some pics






These are Villier's 49-125cc heads, rare as hens teeth (well good ones) well maybe John or Graham have a dust bin full of these in good nick?

The local foundry I frequent would cast these with co2 ,the fins don't look that fine & co2 is a strong sand, I had a few villiers engines mainly 9e 197s & more rare 250s but beermaker blagged them off me!! stuff still turns up at autojumbles round here.
Graham.