Hey my Chevy has Ford Rods !!!!!!

[A79coupe at aol.com]

In a message dated Tue, 8 Jan 2002  1:57:57 AM Eastern Standard Time, "The Punisher" <punisher454 at hotmail.com> writes:

> Huh??  I always thought that longer rods would allow the piston to dwell 
> longer at the end of the stroke (top and bottom) and therefore have a higher 
> speed while traveling up and down. How can it dwell longer at the top AND 
> move slower too??? did I just mis-understand you or am I missing something 
> here ?

The shorter the rod, the longer the dwell at the bottom of the stroke.  Take the extreme (and obviously unworkable) example of a 3 inch rod and a 3 inch stroke.  The piston would be at the bottom of the bore from 90 degrees to 270 degrees.

> 
> 
> >Anyway, I think the point of the long rod comparison is that the piston is
> >closer to TDC for longer, and it's moving slower at every point between +/-
> >90* from TDC.  This causes less heat build-up in the charge, and because 
> >the
> >piston is moving slower at the top of the stroke it gives the expanding
> >gases more time to fill the slower-expanding combustion chamber.  
> >Obviously,
> >the slower piston speed means less vacuum therefore less intake charge, but
> >by adjusting the valve events to suit (wider lobe separation, for one) this
> >can be compensated for.  Also, because the piston is moving slower at the
> >top half of the stroke, there is less chance of rod failure due to "toss".
> >As you mentioned, the side loading is lower too, so less power is lost due
> >to friction and theoretically better piston wear AND better ring wear.
> >
> 
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