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Re: engine talk (archive)
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Posted by Jon on November 13, 2000 at 14:56:17:

In Reply to: engine talk posted by joe on November 13, 2000 at 14:38:09:

Here is an approximate explanation for you.


Pushrod engines actuate the valves like this:
cam -> lifter -> pushrod -> rocker -> valve

Overhead cam engines do it like this:
cam -> lifter -> valve (basically)


 Pushrod setup:
     _________ ___  
    /_________O____\  <- rocker
    ||            ||
    || <-valve    ||
    ||            || 
   /__\           || <- pushrod
                  ||
                  ||
                  ||
                  ||
                  ||
                 |  | 
                 |  | <-lifter
                 |__|
                 /  \                   
                / __ \
               | (__) | <-cam
                \____/

Then, for an overhead cam, imagine putting the cam up on top of the valve. Then you don't need the pushrod.

-Jon


what does "pushrod" refer to? what do engines that do not use this use instead?

thanks
joe




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