[TR] TR4A Piston Upgrade

[Andrew Uprichard]

Randall:

How come I knew you'd pick up on this ?

I guess one answer is that the human body is a little more complicated than
our beloved TRs, and flow to an organ also depends on cardiac output, blood
pressure and the degree by which the resistance vessels (arteries) can
dilate, eg during exercise.  But the bottom line is, very small improvements
in artery diameter can result in very meaningful improvements in perfusion.

So stopping smoking and taking Lipitor can result in many more years driving
our cars.

Andrew

P.S. I may have developed Lipitor, but I do not get any royalties.........

-----Original Message-----
From: triumphs-bounces+auprichard=comcast.net at autox.team.net
[mailto:triumphs-bounces+auprichard=comcast.net at autox.team.net] On Behalf Of
Randall
Sent: Saturday, September 06, 2008 7:52 PM
To: triumphs at autox.team.net
Subject: Re: [TR] TR4A Piston Upgrade

> the closest I cam come is to inform the group that blood flow 
> to an organ (in most or our cases the coronary arteries 
> supplying the heart is the most
> relevant) is related to the radius of the artery to the 
> fourth power.

Wow, that's wild!  How does the flow get related to the square of the
cross-sectional area?

>  If the same holds true in the internal 
> combustion engine, that 3mm may translate into a lot of 
> additional horses.

Not so much.  Displacement follows the square of the bore, but 89^2 is less
than 5% more than 87^2; so we're only talking another 5hp or so (without
other changes).  At nearly $100/pony, not a lot of bang for the buck.

Randall
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