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0. 12:06 PM - Coming Soon - The List of Contributors - Please Make A Contribution Today! (Matt Dralle)
1. 06:13 AM - Re: Re: OVP relay in B+ lead bad idea (Finn Lassen)
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| Subject: | Coming Soon - The List of Contributors - Please Make |
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| Subject: | Re: OVP relay in B+ lead bad idea |
Yes, I guess I should stated "... for an electrically dependent engine".
Mazda 13-B Renesis, two spark plugs per rotor. Electronic fuel injection
and ignition.
Battery: Power Sport YTX20L-BS.
Alternator: Mitsubishi reman'd 14910. 1986-1988 Mazda RX7.
Battery mounted on firewall on engine side.
Gets hot under the cowling. As much as 190F.
Now I'm beginning to question the wisdom of mounting an AGM battery in
the engine compartment. Van's doing it in their newer models, so I
figured it'd be OK. But a casual search seems to indicate that high
temps drastically shortens the life of AGM batteries. However, battery
easily started the engine, so more likely an intermittent (now
permanent) internal disconnect in the battery. That and a relatively
slow acting voltage regulator in the alternator appear to be the causes
of the total electrical power loss (the OVP relay being the weak design
point).
In retrospect prioritizing protection of avionics from alternator
over-voltage event over reliable power for engine was a bad idea. On the
other hand, a major alternator over voltage event would likely also take
out the engine controller.
Appears the real solution would have been a backup battery to power
essential engine electronics. Problem would be how to keep that isolated
from alternator and main battery and still keep it charged. Seems there
will always be some point of possible failure. Perhaps a double-throw
switch to disconnect it from charging diode and connect it to the engine
bus. But would also need to be able to disconnect the engine bus from
alternator and main battery. So it all comes down to a super-reliable
switch, but still single point of failure.
Finn
On 11/12/2024 10:45 PM, user9253 wrote:
>
> Finn, I gather that your engine ignition system is electrically dependent.
> What type and brand is it?
>
> --------
> Joe Gores
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=514422#514422
>
>
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