[TR] TR3 Pistons

[Michael Porter]

On 5/24/2020 6:35 PM, Jeff Scarbrough wrote:
> What is the difference in weight between he pistons (and rods)?  What 
> is the difference in size?


In a way, this is a "how big is an orange?" question.  So, the correct 
answer is probably, "smaller than a grapefruit and bigger than a 
grape."  The dimensions and weights will change from engine to engine, 
and in the case of aftermarket parts, from manufacturer to 
manufacturer.  The other issue is the /relative/ ratio between the two 
parts.  In general, I'd say that pistons are lighter than rods, simply 
because of the materials from which they're constructed, but, beyond 
that, the devil's in the details.  Forged pistons are generally heavier 
than cast ones, because forgings are slightly denser and intended for 
more severe duty.  Full skirts are heavier than split skirts. Rods have 
a fairly large range of weights, because the construction varies so 
much.  H-section, I-section, etc., change the weights a good deal.

If I were to say, "rods are one-third heavier than pistons," or, "rods 
are one-third longer than pistons," that might be true in some very 
general way, but, it's not very helpful. :)


Cheers.

-- 


Michael Porter
Roswell, NM


Never let anyone drive you crazy when you know it's within walking distance....

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