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Good to know, Tracy. I would rather have the
injector give up first than the driver - easier to replace the injector
{:>). I felt certain that your drivers would be designed to survive if
a P&H were connected - good to have it confirmed.
Ed
----- Original Message -----
Sent: Monday, February 28, 2005 3:34
PM
Subject: [FlyRotary] Re: injector life
and reliability
Correct on all points Ed. Except that I changed the injector
drivers to a higher current version about 6 years ago. This was after a
couple of "peak & hold injectors connected as saturated" incidents.
Now the injector gives up first. But I think it still takes a long time
to kill an injector this way.
Tracy
Subject: [FlyRotary] Re: injector life and reliability
Bernie,
Your injectors should be fine, the drivers
won't hurt the injectors -
however, the injectors can hurt the
drivers. Because a saturation driver is
expecting more resistance
(less current requirement) from a saturated type
injector of around 12-16
ohms. If you stick a Peak and Hold (around 2.5
ohms) in a circuit
designed for saturation injectors, they (Peak and hold)
will draw
considerably more current and may exceed the design limit of
the
saturation injector driver thereby damaging it. On the other
hand, if the
designer "over-designed" the driver it may cause no damage
at all.
If you put a saturation injectors in a circuit designed for
Peak and Hold,
you will not damage the drivers because the saturation
injector will never
exceed the current draw the P&H circuit was
designed for - but, you may not
get very good injection especially at the
lower rpms.
So if anything could have been damaged - it would have
been the EC2, but
Tracy has done a good job of providing a bit of margin
there as well. I
don't doubt you had a bad injectors ( I have had
several - they are just
getting old), but I doubt it was caused by the
lack of resistors.
Tracy, of course, will correct any incorrect
reference to his design work
{:>)
Ed
A
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