Today's Message Index:
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1. 05:41 AM - Re: Fuel injection/ electroncs ignition (Archie)
2. 03:04 PM - Re: Fuel injection/ electroncs ignition (steve korney)
3. 03:25 PM - Re: Fuel injection/ electroncs ignition (Archie)
Message 1
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| Subject: | Re: Fuel injection/ electroncs ignition |
--> Engines-List message posted by: "Archie" <archie97@earthlink.net>
> --> Engines-List message posted by: Kent Ashton <kjashton@vnet.net>
>
> You're correct, I think, but this is essentially what the retard (impulse)
> mag does. The impulse mag delays the spark until TDC rather than letting
it
> go at 22 BTDC, same as the LSE system. However, the electronical
ignitions
> put out an impressive fat spark whereas the mag is a little wimpy at low
> RPM.
>
> That said, I used to hand prop my O-320. I thought adding an LSE was
going
> to make it a breeze to hand prop, but it still wasn't a piece of cake when
> the weather cooled off. Not until I added a primer system did it reliably
> hand-start in a pull or two. I'm running two LSEs on an O-360. It always
> starts in 2-3 blades (with a Starter).
> --Kent
Exactly why generator type mags were dropped in favor of electronics in
racing.
As demands for more fuel consumption became manifest, ignition intensity
also had to improve.
Spark gaps of .080 to .100 are achievable with electronic ignition.
Try that with a mag, and it won't start.
Also, remember what the purpose of the impulse coupling is.
It winds the armature up during the startup procedure, and then releases it
to generate a spark at cranking rpm. This is not a problem with electronics.
Spin a mag by hand, then do the same with an electronic trigger, and it will
be obvious which item creates additional parasitic drag on the engine
When people eventually demand power and economy, pulsed injectors as
used in automotive, will be common, and there will be no need for
a mixture control.
Archie Frangoudis
Archie's Racing Service
Message 2
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| Subject: | Re: Fuel injection/ electroncs ignition |
--> Engines-List message posted by: "steve korney" <s_korney@hotmail.com>
Archie...
If you could have a timing curve on a IO-360, what would it look like at
full throttle from say 1000 rpm's to 2700 rpm's...? And "0" advance at
start-up.
Best... Steve
Message 3
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| Subject: | Re: Fuel injection/ electroncs ignition |
--> Engines-List message posted by: "Archie" <archie97@earthlink.net>
> --> Engines-List message posted by: "steve korney" <s_korney@hotmail.com>
>
> Archie...
>
> If you could have a timing curve on a IO-360, what would it look like at
> full throttle from say 1000 rpm's to 2700 rpm's...? And "0" advance at
> start-up.
>
>
> Best... Steve
Cannot honestly answer that, Steve
I have only varied timing with engines on the dyno,
and they had full electronic ignition.
Others have been set using factory settings.
I will say this: If you have a good efficient pressure
cowling, or a water cooled engine, a slight advance
will show up as a slight performance improvement.
Archie
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