Spark Plug Question.., Heat ranges? How to decode? |
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Spark Plug Question.., Heat ranges? How to decode? |
Rusty |
Mar 30 2005, 05:36 PM
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#1
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Wanted: Engine case GA003709 Group: Admin Posts: 7,941 Joined: 24-December 02 From: North Alabama Member No.: 6 Region Association: Galt's Gulch |
I have several sets of plugs here... some Bosch W5DC plugs and some W7DC plugs?
I know that the numeral in the part number is the heat range - but what does it mean to me and my little /6 cylinder monster? -Rusty (IMG:http://www.914world.com/bbs2/html/emoticons/smoke.gif) |
Root_Werks |
Mar 30 2005, 05:41 PM
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#2
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Village Idiot Group: Members Posts: 8,318 Joined: 25-May 04 From: About 5NM from Canada Member No.: 2,105 Region Association: Pacific Northwest |
For Bosch, the higher the #, the slower it transfers heat (hotter plug). If you do nothing but race, then the 5's are good. I usually stick with 7's for street use. Sometimes even 8's.
My favorite plug bosch makes is a W7DTC, grab some, you will see why I like them. (IMG:http://www.914world.com/bbs2/html/emoticons/wink.gif) |
ArtechnikA |
Mar 30 2005, 05:42 PM
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#3
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rich herzog Group: Members Posts: 7,390 Joined: 4-April 03 From: Salted Roads, PA Member No.: 513 Region Association: None |
5's kinda cold for a stock 2,0 although you might keep 'em in case you do a track event weekend. might you have bought those for the E ? 7's a good range for a stock, street, 914.6 |
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Rusty |
Mar 30 2005, 06:08 PM
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#4
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Wanted: Engine case GA003709 Group: Admin Posts: 7,941 Joined: 24-December 02 From: North Alabama Member No.: 6 Region Association: Galt's Gulch |
I've got three sets of W5DCs here. (IMG:http://www.914world.com/bbs2/html/emoticons/dry.gif)
I called my FLAPS and they told me that W7DCs weren't available anymore. Does anyone know if the part number was superceded? The kid on the other end of the phone got confused when I asked him. -Rusty (IMG:http://www.914world.com/bbs2/html/emoticons/smoke.gif) |
Cap'n Krusty |
Mar 30 2005, 06:25 PM
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#5
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
They're hardly gonna drop a plug that fits literally millions of cars still on the road. The trouble with FLAPS is they hire Mac Donald's trained people, and give 'em an electronic parts catalog. There's NO incentive to think outside the screen. In fact, they may not even know there's an "outside the screen" out there. Try "7500", see if that works. I prefer NGK BP6ES, myself. New number is "7333". The Cap'n |
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Rusty |
Mar 30 2005, 06:27 PM
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#6
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Wanted: Engine case GA003709 Group: Admin Posts: 7,941 Joined: 24-December 02 From: North Alabama Member No.: 6 Region Association: Galt's Gulch |
Thanks for the info. Okay... I'll bite. Why? |
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Gint |
Mar 30 2005, 09:33 PM
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#7
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Mike Ginter Group: Admin Posts: 16,070 Joined: 26-December 02 From: Denver CO. Member No.: 20 Region Association: Rocky Mountains |
I'm with Krusty. I prefer the NGK's. Been using them for years.
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Trekkor |
Mar 30 2005, 09:41 PM
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#8
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I do things... Group: Members Posts: 7,809 Joined: 2-December 03 From: Napa, Ca Member No.: 1,413 Region Association: Northern California |
I followed Gint's advice and run the NGK's as well. They fire nicely.
KT |
mihai914 |
Mar 30 2005, 09:50 PM
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#9
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Senior Member Group: Members Posts: 800 Joined: 2-March 05 From: Montreal, QC Member No.: 3,697 Region Association: None |
Here's a handy chart, personally I liked NGK very much untill one of them had part of the insulator surrounding the electrode break and went who knows where. Bosch spark plugs, although may run less smooth, if you look closely have a thicker construction than NGKs.
Attached image(s) |
campbellcj |
Mar 30 2005, 10:51 PM
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#10
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I can't Re Member Group: Members Posts: 4,544 Joined: 26-December 02 From: Agoura, CA Member No.: 21 Region Association: Southern California |
I've been using the NGK's as well, but BP7ES in my case -- 2.2S-spec track car in desert climate; I even keep 8's on hand but have not seen a need to go that extreme as of yet. IIRC the BP6ES is recommended for the milder and/or mainly street driven early engines; and maybe even 5's if you have a tired old oil-burner.
The tricky thing to remember is NGK's get colder as the number goes up; Bosch (and others I think) get hotter as the number goes up. |
Root_Werks |
Mar 31 2005, 09:40 AM
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#11
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Village Idiot Group: Members Posts: 8,318 Joined: 25-May 04 From: About 5NM from Canada Member No.: 2,105 Region Association: Pacific Northwest |
NGK's are great plugs, you can tell by the number of people referencing them here. Buuuuut, I still like the W7/8DTC's over any of the NGK's listed. That said, I have dropped in NGK's into air cooled Porsches and VW's for years. No complaints. But for many years, 90% of what I work on get these: (well, not these, but the W7DTC's). Your spark is not covered, better exposure. Don't use the platnum plugs with 3-4 tips that look like these. Carb'd air cooled engines don't seem to do well with the little platnum tips. (IMG:http://www.914world.com/bbs2/html/emoticons/wink.gif) Attached image(s) |
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