The combustion temperature is affected by cylinder head temp, thats why with unleaded fuel they changed for an higher temp stat, unleaded needs higher temps for the optimal combustion.
Bp7Es Or Bpr7Es
Started by
booton
, Sep 30 2012 05:24 PM
16 replies to this topic
#17
Cerberus
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Posted 01 October 2012 - 02:15 PM
Other way around really the temp of the head is caused by the combustion, but it still doesn't really bare any relevance to the temp rating of a plug.
The temp rating of the plug is purely how hot the plug is (how well it can keep heat in, or get rid of heat).
This is where I've been reading.
Only had a quick read on the net, but wouldn't it be more likely that a higher stat was used when unleaded came in, because the unleaded burns hotter and so produces more heat.
The normal operating engine/water temp is around 90 degrees isn't it? That' what it is on our 1972 TVR, which I believe would have run on leaded then, but now runs unleaded (although judging the requirement of the thermostat based on this car isn't great, as the cooling isn't exactly 100%,
).
The temp rating of the plug is purely how hot the plug is (how well it can keep heat in, or get rid of heat).
This is where I've been reading.
The heat range of a spark plug has only a minute effect on combustion chamber and overall engine temperature. A cold plug will not materially cool down an engine's running temperature.
Only had a quick read on the net, but wouldn't it be more likely that a higher stat was used when unleaded came in, because the unleaded burns hotter and so produces more heat.
The normal operating engine/water temp is around 90 degrees isn't it? That' what it is on our 1972 TVR, which I believe would have run on leaded then, but now runs unleaded (although judging the requirement of the thermostat based on this car isn't great, as the cooling isn't exactly 100%,
).
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