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

[Clint Corbin]

It's geometry guys.  A long rod WILL increase the dwell time at both TDC 
and BDC.  And because the piston spends more time at the top and the 
bottom, it WILL be moving faster between the two.  I think it is pretty 
safe to say that if any rod combo is "yank"ing the air column, it would be 
the long rod, not the short rod.  The scrub angle on a short rod will 
increase the side loads on the piston and increase the wear on the rings 
and cylinders.  In general, the longer dwell time at TDC helps with 
combustion efficiency and gives a better "push" on the rod during the 
stroke.  Long rod engines tend to be more efficient than short rod 
engines.  Of course, as you make the rods longer, they have to get heavier 
due to the increased beam length.  It also makes the whole engine taller 
and heavier.  Like everything else, there is a happy compromise that you 
have to find for YOUR application.

Clint

At 09:09 PM 1/8/2002 -0600, you wrote:


>Programmer wrote:
>
> > 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.
>
>Short rods tend to yank the air column to get it moving. Long rods tend to 
>suck
>gradually and are generally a crutch for bad intake ports. the net effect
>depends upon cam timing and intake tract efficiency. 302 Fo^&*%(^&%rds run 
>good
>(short rods) because of the combination of parts. 426 Hemis (all Chry) 
>have long
>rods and run good because of good heads. most smaller motors and "work" motors
>are "long rod".  just another $.02  Tom S
>
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