| VWLarry |
Thu Jan 04, 2007 8:00 am |
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| Just need to know the difference between a Bosch W7AC and W8AC spark plugs. Is one hotter than the other? I usually run W7AC but got the W8AC last night at my local FLAP. Just need to know if there is any real difference. Thanks. |
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| vwracerdave |
Thu Jan 04, 2007 8:04 am |
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| What compression ratio you running? |
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| VWLarry |
Thu Jan 04, 2007 8:12 am |
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| yea I guess I should have given some details. It's a bone stock '72 standard bug, 1600 dual port. Thanks. |
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| andk5591 |
Thu Jan 04, 2007 8:34 am |
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| Go to NGK and Bosch's websites and you will learn more than you want to know about plugs. Its pretty cool and I learned a LOT. |
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| vwracerdave |
Thu Jan 04, 2007 8:46 am |
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| W8AC is the stock plug for a stock 1600 engine. |
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| Banzai KG |
Thu Jan 04, 2007 9:14 am |
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This info is from the Type 2 Technical Reference site - http://www.type2.com/library/library.htm
Bosch Spark Plug Numbering System
(at least here in the US/Canada):
Old Bosch Part #---Revised #---Latest #
W145M1-----W8A0-----Same
W145M2-----W8CC0-----Same
W145T1-----W8AC-----7502
W145T2-----W8CC-----7504
W145T30-----W8DC-----7505
W175M2-----W7CC0-----Same
W175T1-----W7AC-----7596
W175T2-----W7CC-----7598
W175T30-----W7DC-----7500
Note: "LATEST #" designations are the latest Bosch Marketing numbers being phased in here in the US. I've seen these numbers on skin-packed plugs at places like K-Mart, Target, Wal Mart and some FLAPS. Use to be you could tell the heat range of the plug by it's Part Number (W8 being hottest, W4 being coldest) but with this new system, you can tell anymore without a scorecard. I continue to list and sell 'em under the "W" Part Number.
W8's are hotter running plugs for most normal driving conditions as well as colder climate and lotsa stop n go traffic.
W7's are colder running plugs for warmer climates and extended/high rpm highway driving. Usually the plug of choice when building those hi-perf motors as well because they tend to run a little hotter than stock. |
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| andk5591 |
Thu Jan 04, 2007 1:19 pm |
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| keep in mind that NGKs are backward (now I remember) Lower number is hotter. |
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