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![[Linked Image from vcca.org]](http://vcca.org/wow/chat/original_spark_plugs.jpg) Click here for PDF version Original Spark Plug Listing
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Hello Bill,
Could you tell me what the K-11 spark plug heat range might have been? I'm guessing they are no longer available, so what would you consider to be a good replacement for it?
Dave
old cars are meant to be driven !!
VCCA # 047832
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Joined: Nov 2001
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Former ChatMaster ChatMaster - 5,000
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I think that the R46 is the replacement for it - don't know the heat range.
Maybe someone else can chip in.
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ChatMaster - 1,000
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Dave
old cars are meant to be driven !!
VCCA # 047832
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Joined: Jan 2002
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ChatMaster - 25,000
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That would equal a 46. I use Ac 45 or Ac R45 in my 1939 and they work fine. If you do more highway driving the cooler #45 would have been recomended.
As per the list. The 1949 and 1950 used the AC 46-5, not the 44-5.
The heat range of the spark plug depends on the type of service that the engine recieves. Hotter plug for low speed use (higher number) cooler plug (lower number) for high speeds.
Last edited by Chev Nut; 11/25/12 11:05 PM.
Gene Schneider
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For us with less understanding about spark plugs
"46" really means... the "4" means that it is a 14 mm plug thread and the "6" equals the heat range. ( hotter than a "44")
"44" really means...the first "4" means that it is also a 14mm plug thread and the second "4" means that it is a cooler plug than a "46"
Am I close to right?
dtm
the toolman
60th Anniversary Meet Chairperson
Dave
VCCA # L 28873
VCCA #83 Tool Technical Advisor for 1914-1966
VCCA #83 1940 Chevrolet Technical Advisor
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That is correct. So it follows a 86 AC plug would be 18MM and hotter than a 85. A 77 AC plug would be a 7/8" plug hotter than a 75. The late model AC part numbers do not follow this system.
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