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

Programmer nwester at eidnet.org
Tue Jan 8 22:37:42 GMT 2002


It's for piston dwell time at TDC and BDC--affects cylinder fill...and does
affect HP/torque curve. However--it's more reciprocating mass.

Lyndon

----- Original Message -----
From: "The Dupuis" <dupuis10 at telusplanet.net>
To: <diy_efi at diy-efi.org>
Sent: Tuesday, January 08, 2002 6:15 AM
Subject: RE: Hey my Chevy has Ford Rods !!!!!!


> The piston moves faster at the bottom half of it's stroke.  Do a model in
> AutoCAD or something like it to see - the long rod moves slower in the top
> half but faster in the bottom half.
>
> > -----Original Message-----
> > From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> > Behalf Of The Punisher
> > Sent: January 7, 2002 11:33 PM
> > To: diy_efi at diy-efi.org
> > Subject: RE: Hey my Chevy has Ford Rods !!!!!!
> >
> >
> > 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 ?
> >
> >
> > >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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