Quote:
Originally Posted by puttputt
how they do CVVT with pushrods is beyond me
|
Easier than an OHC motor. Only one cam to advance or retard. There will be a mechanism incorporated into the cam drive to advance or retard the cam timing as required. That's all variable valve timing is.
It's about time we saw direct injection on production petrol engines. Diesels have been using it for years. The extremely fine fuel atomization means you have a much better homogenized mixture in the chamber and a more efficient burn. You are also not reliant on the vagaries of cylinder vacuum and port flow to ensure you get the right ammont of fuel and air in the cylinder at the right time.
Funny thing is an Aussie pioneered a lot of this technology. Look up a fellow named Ralph Sarich. He came up with a lot of these ideas back in the 70's
Cheers