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| Side Valve IC engine |
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| Ginger Nut:
:thumbup: Norman thanks for the WiP |
| NormanV:
I knew that this casting was going to be tricky. I have had several attempts at making the sand cores. The crankcase core fell apart on the second attempt, the CO2 didn't penetrate. On the third attempt it came out perfectly. The cylinder core was much more trouble. It just would not release from the mould and after four attempts I gave up and made a straight mould using a cardboard tube. I will have to bore out the waterspace. I cast it today, I made sure that I vented the mould much more that usual and I used tin cans over the pouring hole and the riser to give a greater head for more pressure as I poured. It went well and when I knocked it out I found that it was almost perfect. There is one place where the metal did not flow fully, leaving a void. I think that I will be able to patch it or fill it rather than make another casting, I can claim that it is a part of the original design! I didn't remelt the original casting as I thought that it would be useful to practice on. I will post a picture of the new casting tomorrow. |
| awemawson:
Norman, put some icing sugar in the sodium silicate when making the core to improve breakdown |
| NormanV:
Andrew, I wish that I had known that before. I had a heck of a job getting the core out of the first casting! |
| awemawson:
Oh well .... now you do :med: You can buy Sodium Silicate already laced with glucose, but I've always found raiding the larder is more convenient - anyway some times you want it rock hard. |
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