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Date: Thu, 01 Feb 2007 09:23:27 -0500
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From: "Hamid A. Wasti" <hwasti@starband.net>
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Subject: Re: [LML] IO-550 fuel injection system
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bob mackey wrote:
> Jeff asked if I have taken my Toyota to FL260...
> No, I have never taken my Toyota to FL260, nor to -60F.
> My expectation is that it will work fine at -60F
On what basis do you have that expectation?  I can not think of any 
basis other than wishful thinking.  In aviation, wishful thinking devoid 
of actual facts only gets you as far as the site of your fatal crash.

> The fuel itself changes seasonally. The temperature
> has ranged from -40F to 120F.
The mechanical engineers will have something to say about it from the 
mechanical point of view, but from an electronics side, going from -40C 
to -55C is a HUGE, no make that a REALLY HUGE step.  And upper limit has 
to be more than 50F higher than that, because things get a lot warmer 
under the hood than the "temperature in the shade"  And that is before 
you start the engine.


> I would say the Toyota fuel injection system is better
> engineered to meet its expected operating conditions than the system 
> in the Continental.
And how many million engines does Toyota produce?  That has a lot to do 
with amortizing the cost of the development.  More importantly, that 
provides Toyota and other automotive companies the ability to field test 
their equipment and improve its reliability.  Would you buy a 
continental engine if it cost a couple of million dollars, if it came 
with Toyota style engine controller and Toyota level reliability?  This 
is a hypothetical question.  I am not implying that it is actually 
possible to achieve that for a few million dollars a copy or for any 
amount of money when you take into account the longevity and weight 
requirements for the aircraft engine.  And before you start screaming 
about the longevity of your Toyota engine, try running it at 80% power 
all day long instead of the 8% or less that you currently use and see 
how long it lasts.  It is called a racing engine and it has a TBO of 
less than 20 hours (yes, that is twenty hours).

Regards,

Hamid