The biggest difference between the W7CC and W7CC0 (that's right - itsa zero) is the design and characteristics of the insulator shell portion near the electrode tip. The "0" plug is usually specifically designed for the vehicle it is intended for, ie: Vanagon Wasserboxer engine (and reaching back a few years in a slightly different electrode design, the 75-79 Fuel Injected Beetle under W8A0 or W8AC0). The W7CC is an acceptable replacement (even as shown in VW's Microfiche & ETKA, along with Bosch references) for the Wasserboxer. However, because of the "universal" design of the W7CC being used in a variety of vehicles (Nissan, Toyota, etc.), it may or may not last as long as the "0" plug. In my case, W7CC0 spark plugs usually last as long (if not longer,) as the factory specs call for. The W7CC plug (in my experience, others may differ,) seems to have most times been pretty wasted by the time the mileage specs call for a spark plug change. It's purely up to the vehicle operator. BTW, for proper NGK interchange info: W7CC = NGK B6ES W7CC0 = NGK B6EY The W7DTC Tri-Electrode Spark Plug is used extensively by Audi-VW in their inline 4 series in the late 80s/early 90s and for strangely just one year on the Wasserboxer (1985). I have used this plug in the past and my seat-of-the-pants impression is that the engine runs a bit smoother with little or no change in mileage. Some owners using this plug have commented that passing the local emissions test is more difficult, the readings being abit higher or exceeding the minimums on some cases. I have not had this happen as I continue to use the W7CC0 in most driving conditions with my rig. The proper NGK plug interchange for the W7DTC is BP6ET (Resistor version is BPR6ET). The Bosch 7598 is W7CC, not W7CC0. No "0" spark plugs have a 4 digit product code according to Bosch. These plugs continue to be sold under their designator W7CC0 (formerly W175M2), because they are not pre-packaged in hanging boxed or blister pack sets of 4. W7CC0 standard packaging is 10 plugs per box. The difference between the "W" numbers and the 4 digit number is purely for marketing purposes. "W" number spark plugs come 10 to a box, the 4 digit "market" number designators are pre-packed in quantities normally used for what vehicles they are (or were) generally intended for (4, 6 or 8) . The term "Super" Plug is generally what Bosch calls all of their Copper-Core spark plugs. When Bosch went head-to-head with NGK (who had copper core before Bosch) in the early 80s, they touted their Super Plug as being copper core. Champion, Autolight, AC-Delco soon followed suit. Designations of the Bosch spark plug changed as follows: Original Bosch Long Number: W175T1 First New Bosch Number: W7C Copper Core "Super" Number: W7CC 4 Pak Marketing Number: 7598 (Info Sources: Bosch Spark Plug Catalog #221101, dates 1975 thru 2003) I do not have an opinion on Platinum series plugs, single or 4 electrode. If they work for you, continue to do so. If not, continue to use what the factory called for in the first place. Jim Thompson 84 Westfalia 2.1 "Ole Putt" oldvolkshome@earthlink.net jim@karmannghia.com http://www.oldvolkshome.com *********************** ----- Original Message ----- From: "tabe johnson" <xtabe@YAHOO.COM> To: <vanagon@GERRY.VANAGON.COM> Sent: Thursday, October 28, 2004 9:01 PM Subject: Spark Plug Options for 2.1 WBX - SUMMARY
> I've been going through the archives for the last hour and > am summarizing my findings here. > > Bosch's old numbering system uses a combination of letters > and numbers which designate the physical characteristics of > the plug. Their new system is a four digit number. > > > The Bosch OEM plug that came with the engine is called > the Bosch "Super" plug. Its number is W7CC0 or 7598. Lots > of people like this plug. It is cross referenced as > an NGK B6ES. > > The cheaper version of the OEM plug is the Bosch W7CC. > There was a suggestion in the archives that they don't last > as long as the W7CC0. I was not able to determine the > difference between the two types. Its NGK cross reference > number is also B6ES. > > A couple of people vociferously recommend the Tri-electrode > Bosch plug with the part number W7DTC. It was OEM on '85 > WBXs and is used in numerous other automotive applications > as well. It is cross referenced to NGK BP6ET. > > A couple of people also recommend the Platinum plug, which > is more expensive than the OEM one. Its Bosch number is > 4233. > > There is no four electrode "Platinum +4" plug recommended > for the 2.1L WBX. > > Other manufacturers apart from Bosch and NGK offer similar > ranges of options. > > > Spark up happily! > > --tabe johnson > xtabe@yahoo.com > '87 Westy > > > ______________________________________________________________________ > Post your free ad now! http://personals.yahoo.ca |
Please note - During the past 17 years of operation, several gigabytes of
Vanagon mail messages have been archived. Searching the entire collection
will take up to five minutes to complete. Please be patient!
Return to the archives @ gerry.vanagon.com
The vanagon mailing list archives are copyright (c) 1994-2011, and may not be reproduced without the express written permission of the list administrators. Posting messages to this mailing list grants a license to the mailing list administrators to reproduce the message in a compilation, either printed or electronic. All compilations will be not-for-profit, with any excess proceeds going to the Vanagon mailing list.
Any profits from list compilations go exclusively towards the management and operation of the Vanagon mailing list and vanagon mailing list web site.