Relay-Version: ANU News - V6.1 08/24/93 VAX/VMS V5.5-1; site msus1.msus.edu
Path: msus1.msus.edu!newsdist.tc.umn.edu!umn.edu!spool.mu.edu!torn!watserv2.uwaterloo.ca!watdragon.uwaterloo.ca!rblander
Newsgroups: rec.motorcycles
Subject: Re: Plugs
Message-ID: <Cto0AA.67r@watdragon.uwaterloo.ca>
From: rblander@watdragon.uwaterloo.ca (Robyn Landers)
Date: Thu, 28 Jul 1994 19:18:09 GMT
Sender: news@watdragon.uwaterloo.ca (USENET News System)
References: <312esd$87c@bronze.lcs.mit.edu>
Organization: University of Waterloo
Keywords: NGK spark plug
Summary: NGK spark plug coding
Lines: 45

In article <312esd$87c@bronze.lcs.mit.edu>,
Erik N. Levin <enl@bronze.lcs.mit.edu> wrote:
>Can anyone explain the system used to designate spark plugs? What are teh
>heat ranges and ahat does the temp of a plug effect? What are the codes
>like ES and ESR and EA ect.? Do grooveed/split electrode plages really
>make a difference? 
>
>Please quote replies to me via mail, as my server dumps posts very 
>quickly and replies tend to go before I see them.

        I'll post as well as CC you by mail.

        The only spark plug coding system I know anything
about is NGK, but since we're on rec.moto, almost everyone is
using NGK plugs right?

        Here's an example explanation for DPR8EA-9
which is what my bike uses.

D - 10 mm diameter.  B means 12 mm.
P - projected tip type.  This field is optional and may be blank.
R - resistor plug.  This field is optional and may be blank.
8 - temperature range. Lower number is cooler, higher is hotter.
E - 3/4" reach
A - special type.  There are many special types defined.
9 - gap measurement code.  9 means .035" if I remember right.

Another common plug is DR8ES-L.
This is 10 mm, resistor, temperature "8", 3/4", standard type,
and my NGK book does not explain what an alphabetic suffix means.

        If you must know all the possible values/definitions,
hassle me some more and maybe I'll bring in my NGK book and
type it all in.

        You should move up one temperature value for
extended high speed riding, or so says my shop manual.



-----
Robyn Landers                      | "Any profit should go to Arnie's `get the
rblanders@math.uwaterloo.ca        |  daemon carved on Mount Rushmore' fund."
Denizen 0051,  KotV4               |       - Marty Albini, DOD0550
VF750S Sabre (his) FZX750 Fazer (hers)