>> > Hi Paul,
>> >
>> >     FYI, the RX8 coils fail frequently in racing (1 or more a race) >> > but
>> > I am not aware of any failing in street use - although they may and >> > I
>> > haven't heard of it.
>> >
>> > Jim Mederer
>> >
>> > Thanks Jim. I think we are seeing that too. We have a few years
>> > with Chevy V8 LS1 coils and they seem to be fine.
>> > Actully Denso made in China :)
>> >
>> > Paul Lamar ...No rotor no motor.
>>
>>
>> Paul,
>>
>> Thanks for your efforts, I will get the scope onto mine. The 11 volts >> is a
>> bit of a puzzle. I would have expected 14 volts. Maybe there is a >> ballast
>> resistor. Do you have the circuit diagram?  How is ppm calculated from >> rpm?
>> After reading Jim Mederer's email I am inclined to purchase a set of >> LSI
>> coils.
>>
>> Ian Beadle
>>
>>
>> You are looking at the bottom of the coil so there
>> are drops.
>>
>> Come to think of it I was wrong. Each rotor fires once per rev
>> so it is not 3000 ppm but 6000 pules per minute.
>>
>> No circuit diagrams of the coils. Always a mystery
>> what exactly is in there.
>>
>> Tracy has been flying LS1 coils for quite awhile.
>> So have some other people. No reported troubles so
>> far.
>>
>> Paul Lamar ...No rotor no motor.
>>
>
> Tracy has had at least three failures of the D580 coils (truck version)
> but none with the D581 (Corvette version).  There is also a D585 that
> has the same connector as the D580 and also has a heat sink on it.  I
> don't know of any use history on it and it's more expensive.  I bought
> a set of coils on ebay that are supposed to be higher output, but
> haven't tried them.  They are at the hanger and I don't remember the
> number.  Also, I think the 2006 Corvette coils were changed and now > have
> the smaller connector.  That may be the version I got on ebay.
>
> Bob W.
>

Bob,
My notes say that Tracy had the failures with the D581 and then went back to
D580's - this is all terribly confusing, still the heat sink is a good idea.
George ( down under)

You are right George.  The D581 is the truck version with the small
connector and the one Tracy has had trouble with.  The D580 is the
Corvette version with the larger connector.  The D585 is a replacement
for the D581 with the small connector.  (I'm holding one in my hand so
I'm sure.)  The 2006 and apparently the 2005 Corvette version is a D514A
and I'm not sure which connector it uses. I think it's the smaller
one.  I have both styles of 4 pin low voltage connectors although only
the larger one is shown in the catalog (I am trying to get an airplane
finished.) See catalog by going to the http address in last line of my
signature. Magnecore supplies the high voltage lead to the spark plug.
I hope this is all correct now.  I can find out for sure which
connector the D514A uses tomorrow.

Bob W.

Bob,
Good-Oh!
Does it have a heat sink?
George ( down under)

If so please take a picture.

Paul Lamar

The fundamental problem is a one rotor fires once per revolution
and has one main coil while the equivalent two cylinder four
stroke piston engine has two main coils that fire every other
revolution. That means a rotary running at 6000 RPM continuously
is equivalent, as far as the coils are concerned, to a four stroke
piston engine engine running at 12,000 RPM continuously. It is
amazing the Denso LS1 coils are as durable as they are.

From this you can see the problem. We need a bench set up so
we can test coils for heat rise while firing  at a continuous
6000 times a minute. Perhaps we should contact MSD and see if
they have something.

Seem like the old 2nd gen coils were more reliable.

Paul Lamar ...No rotor no motor.

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