[Fot] TR6 Cosworth pistons

[greg]

All,
      After Shane's comment I thought I would measure the piston length 
as I had never noticed the Cosworths as being overly short. The stock 
piston is 2.440" and the Cosworth is 2.230". The Cosworth is a full 
skirt design which is not much used today in racing engines. A modern 
Cup motor or Pro Stock motor use pistons which have skirts the size of a 
postage stamp. There is just enough material under the head to hold the 
rings and a short pin to make them extremely light. These modern pistons 
are CNC'd under the top to match whatever popup is on the top side 
further contributing to lightness. The Cosworths are an older design and 
I suspect a modern Ross or the like could be a little lighter. The new 
set I have left is 1977 vintage left over from PLN's team. Cosworth has 
probably updated by now but they are awfully expensive. They were $1,800 
a set in 1992 the last time I checked which leaves room for about 3 sets 
from most other manufacturers.
Greg Lund