Re: ZIS 110

Posted by HH56 On 2009/4/18 19:41:49

Maybe--but it would require a lot of length in the cylinder to contain the spring and a lot of strength in the top cap as well--probably cost way more than they wanted to spend.

The advantage to the way they did it on both cars is the mechanical leverage vs travel. Can't tell exactly the ratio on the ZIS but on the Packard it is roughly 3:1 so if the piston moves 6", the window moves 18". The apparently smaller diameter cylinder and leverage loss would require higher pressure though so maybe why Packard was double the ZIS. On the other hand, the ZIS cylinder appears shorter but larger diameter so it's mechanical leverage may have been more --maybe 4:1 but because of the diameter, lower pressure.

One thing on the frame type assembly might be in ease of manufacture. Packard bolted in the whole thing with 2 bolts at the bottom and little adjustment needed (or available even if they did) whereas the ZIS looks like it took a bit more work to mount and adjust.