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bikerfox 
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Joined: Aug/02/2009 Location: USA Status: Offline Points: 4457 |
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 Topic: spark plugs?Posted: Mar/21/2012 at 6:05pm |
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If an Autolite 65 is equivalent to an RN12YC,
when would it be prudent to run an Autolite 63 vs. 64? Is there a large difference between a 63 and 64? Forget about the circumstances.....just educated opinions, pls.
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1969 Rebel SST (1970-1987)
1968 AMX (2005-2011) 1969 SC/Rambler (2011-2019) 1970 Javelin (2019 to ?)"Jane" |
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tsanchez
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Posted: Mar/21/2012 at 6:09pm |
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63 64 are just colder versions of 65, same everywhere
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billd
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Posted: Mar/21/2012 at 7:00pm |
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In identical spark plug types, the difference from one full heat range to the
next is the ability to remove 70°C to 100°C from the combustion chamber.
The heat range numbers used by spark plug manufacturers are not universal, by that we mean, a 50 heat range in Autolite is not the same as a 50 heat range in Champion. Some manufacturers numbering systems are opposite the other, for domestic manufacturers like Autolite (and Champion), the higher the number, the hotter the plug. For other manufacturers (NGK, Denso, Bosch), the higher the number, the colder the plug. I think I had this included when I posted a long bit on spark plugs a while back... LOL 
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17tamx
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Posted: Mar/22/2012 at 12:42am |
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I am running Autolite 66's for my 390. Are you running colder plugs?
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Kirk P. Fletcher
70 AMX BBG w/Shadow 390 4sp 71 SC360 Wild Plum Ram Air 4sp 67 Rogue Convert 343 4sp 66 Rogue Hardtop 290 Auto 66 440 Convert 232 Auto |
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bikerfox
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Posted: Mar/22/2012 at 8:05am |
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Correct me, pls., if I am wrong,. but I thought that an Autolite 65 is equivalent to an N12Y.
If I am correct an AL 66 is equal to an N14Y, one heat range warmer. Bueller....Bueller?
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1969 Rebel SST (1970-1987)
1968 AMX (2005-2011) 1969 SC/Rambler (2011-2019) 1970 Javelin (2019 to ?)"Jane" |
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tsanchez
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Posted: Mar/22/2012 at 8:22am |
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bikerfox
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Posted: Mar/22/2012 at 8:33am |
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So, on a stock or modified 390, why would one want to run a hotter plug? Doesn't make sense to me.
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1969 Rebel SST (1970-1987)
1968 AMX (2005-2011) 1969 SC/Rambler (2011-2019) 1970 Javelin (2019 to ?)"Jane" |
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tsanchez
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Posted: Mar/22/2012 at 8:44am |
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Kirk may have his reasons, I run a autolite 2594 equivalent to a N2C
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17tamx
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Posted: Mar/22/2012 at 9:00am |
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I checked the Autolite web site and it show that our 390's take a number 66. Their interchange shows that the 66 covers both the N12Y and N14Y.
I also checked the NAPA Pro-Link system that the repair shops use to look-up parts and it shows that our 390's also use an Autolite 66.
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Kirk P. Fletcher
70 AMX BBG w/Shadow 390 4sp 71 SC360 Wild Plum Ram Air 4sp 67 Rogue Convert 343 4sp 66 Rogue Hardtop 290 Auto 66 440 Convert 232 Auto |
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billd
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Posted: Mar/22/2012 at 9:05am |
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Correct - one heat range colder or hotter with one brand may fall between the other brand's ranges. It's not a 1 to 1 correlation at all, making it complicated.
If a 66 = 12/14 in Champion, then a 65 does NOT = one range colder in Champion. There often is no direct translation - so if you change plug brands, their conversion may take you a bit colder than the Champion, or a bit hotter. It's sort of like temperatures - 32 F might be 0.0000 C, but 33 F does not = 1.0000 C This is another reason one store's book may show the Champion number matching a 65 while NAPA might show a 66 and yet another book/conversion shows something different yet. They are all correct - because it's an estimate. Typically, modified engines take a colder plug, though........... |
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bikerfox wrote: