Quote:
Originally Posted by topcat
.... Car manufacturers will bias this trade-off towards hot because it keeps the service interval longer......
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I think that is a pretty big assumption!
If you take this logic a step further, it would read something like this....
The spark plug engineer speaking, "yes, we decided with a longer insulator tip, as this will lengthen the service life of the 'service interval'. However, we are now getting complaints of engine detonation for those who like to drive full throttle on the Autobahn. Oh that's OK as we built in a lot of extra cost into the vehicle to cover warranty work, so we should be fine!!"
Now would we expect that the vehicle engineers would actually say this? I doubt it, as profit margins on cars are very tight, especially for small cars. The engineers will always select a plug insulator temperature that gives them a safety factor for drivers who abuse the vehicle.
Elongating the service interval would take a back seat to keeping an engine from melting down due to a too hot spark plug in there.
Jim.