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Nope - Pushrods
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Posted by RS [Email] (#15) [Profile/Gallery] (more from RS) on Mon, 12 Jan 2004 16:08:32 Share Post by Email
In Reply to: OT - Chrysler trivia, is a new Hemi OHC?, Mike Lynch [Profile/Gallery] , Mon, 12 Jan 2004 15:45:43
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The original '50s hemis were pushrod-operated with a central camshaft, too.

Look about halfway down the page, below the cutaway engines, under "Our original page"

"It has 16 pushrod-operated overhead valves, hydraulic lifters with roller followers, sequential multiple-port returnless fuel injection, and a compression ratio of 9.6:1. It uses a deep-skirt cast iron block with cross-bolted main bearing caps, and aluminum alloy heads with of course hemispherical combustion chambers. In this regard, it is similar to the V10 (based on the venerable LA V8s), which also has a deep skirt cast iron block, hydraulic lifters with roller followers, and pushrod-operated overhead valves - two per cylinder. (The V10 has iron heads when used in trucks.)

Dual spark plugs are used to speed fuel combustion, making the engine more powerful and efficient while decreasing emissions (though not down to ULEV levels). A cylinder deactivation system, which does not appear to be related to systems used by Mercedes, was originally designed into the engine to prevent fuel from being wasted when the engine is under light loads. We don't know whether this was continued, because it is not mentioned in any of Dodge's current publicity materials. (Thanks, Troy Kleffman.)

AI-Online also noted that the Hemi has double rocker shafts in each head, like its predecessors, but has valve gear within the head walls."


posted by 68.166.1...

http://www.allpar.com/mopar/new-mopar-hemi.html

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