And what country can preserve its liberties if their rulers are not warned from time to time that their people preserve the spirit of resistance? Let them take arms. The remedy is to set them right as to facts, pardon and pacify them. What signify a few lives lost in a century or two? The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants.
I do. As far as I know, only Ducati still uses desmodromic valve actuation. Mercedes-Benz race cars in the '50s, and Benelli motorcycles had them as well. Valve springs have improved so much that using a second cam follower to close the valve is no longer necessary to prevent valve float at high rpm. The cam lobes in a desmodromic valve train have to be perfectly machined so the open and close followers move in synch. Al_in_Ottawa
Who else knows what a desmodromic valve is?
ReplyDeleteI do. As far as I know, only Ducati still uses desmodromic valve actuation. Mercedes-Benz race cars in the '50s, and Benelli motorcycles had them as well. Valve springs have improved so much that using a second cam follower to close the valve is no longer necessary to prevent valve float at high rpm. The cam lobes in a desmodromic valve train have to be perfectly machined so the open and close followers move in synch.
ReplyDeleteAl_in_Ottawa