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| What is the difference in ECUs (Page 3/3) |
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82-T/A [At Work]
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JUN 30, 07:50 AM
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| quote | Originally posted by sleek fiero:
Hi Todd Platinum is actually a slightly better conductor than steel and is much more corrosion resistant That is the main reason the spark plugs on almost all new vehicles are either platinum or iridium rather than steel. According to the plug manufactures the give a more reliable and consistent spark. sleek |
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Oh my Gosh... you're right Sleek, I've had that completely backwards this whole time. I looked at the math wrong. This is resistance measured in ohms for the three elements we just mentioned...
Iridium 5.289x10-8
Platinum 1.06x10-7
Steel (Cast) 1.61x10-7
I know Platinum is normally picked because it has a higher melting point and more resistant to corrosion, but did not realize it was more conductive as well.
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pmbrunelle
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JUN 30, 10:01 AM
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The electrical resistance of any metal used in a spark plug is irrelevant considering that the spark plug wire feeding it will have a resistance in the thousands of Ohms range.
Erosion over time is the bigger concern.
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sleek fiero
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JUN 30, 10:43 AM
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| quote | Originally posted by pmbrunelle:
The electrical resistance of any metal used in a spark plug is irrelevant considering that the spark plug wire feeding it will have a resistance in the thousands of Ohms range.
Erosion over time is the bigger concern. |
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More important is the amount of metal transfer or loss with each spark. The arc is hot enough to vaporize minute amounts of surface metal with each spark.
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82-T/A [At Work]
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JUN 30, 12:11 PM
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| quote | Originally posted by sleek fiero:
More important is the amount of metal transfer or loss with each spark. The arc is hot enough to vaporize minute amounts of surface metal with each spark. |
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Good point. I've literally removed plugs in the past that had a crater where the arc would occur. Until I saw a few new ones and some in other conditions from other engines, I assumed it was a design feature! Haha...
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fredtoast
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JUL 02, 07:31 PM
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| quote | Originally posted by 82-T/A [At Work]:
Best thing I can recommend to answer your question though... for improved performance, engine efficiency, and better emissions for a more complete burn, go with a higher capacity ignition coil and an MSD ignition box like a 6EFI. I've used the 6AL in other cars, never in a Fiero... but I recently bought one to install when I get the chance. I think the MSD box (6EFI is the one you want that will be plug and play for the Fiero) is about $200 bucks.
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It looks like the 6EFI is around $250, but Delco ICM is $150. So not a lot more.[This message has been edited by fredtoast (edited 07-02-2023).]
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