wile e coyote Posted March 18, 2008 Share Posted March 18, 2008 Ok ive just fitted new spark plugs but could only get NGK Iridiun BKR8EIX and what was in were Denso Iridium IK22 Now as this is a colder plug will i cause any damage or will they be fine. Car seems to run fine Cheers Darren Link to comment Share on other sites More sharing options...
Harllequin Posted March 19, 2008 Share Posted March 19, 2008 To my mind it will depend on the setup of your car. Have you checked against these threads for what your car is to what is the recomended plug? http://www.mkivsupra.net/vbb/showthread.php?t=41927 Link to comment Share on other sites More sharing options...
edge Posted March 19, 2008 Share Posted March 19, 2008 I have the BKR8EIX in mine and im bpu and they are fine. Link to comment Share on other sites More sharing options...
georigg Posted March 20, 2008 Share Posted March 20, 2008 The term "hot" and "cold" as applied to spark plugs refers to the length of insulation on the centre electrode. One has a long insulation and the other has a short(er) insulation. The more insulation on the centre electrode the "colder"(relative term) the plug centre electrode will be during normal firing. In terms of engine operation, these terms are in a sense reversed in that an engine that runs at a normally "high" temperature in the cyclinder head(more to do with cylinder head design) will fit a plug with a "long" insulation to ensure that the electrode is maintained at the correct temp, and an engine that runs at a relatively "cold" temp will fit a short insulation electrode so that the electrode will be maintained at the desired temp in normal operation. As you can see the terms "hot" and "cold" are relative and should not be taken as their normal meaning! Spark plug temperature ranges are fairly small in real terms so fitting the next grade down or up will not significantly affect engine operation unless you are using it for racing, or running the engine constantly at its peak/max capability. rgds Georigg Link to comment Share on other sites More sharing options...
wile e coyote Posted March 20, 2008 Author Share Posted March 20, 2008 The term "hot" and "cold" as applied to spark plugs refers to the length of insulation on the centre electrode. One has a long insulation and the other has a short(er) insulation. The more insulation on the centre electrode the "colder"(relative term) the plug centre electrode will be during normal firing. In terms of engine operation, these terms are in a sense reversed in that an engine that runs at a normally "high" temperature in the cyclinder head(more to do with cylinder head design) will fit a plug with a "long" insulation to ensure that the electrode is maintained at the correct temp, and an engine that runs at a relatively "cold" temp will fit a short insulation electrode so that the electrode will be maintained at the desired temp in normal operation. As you can see the terms "hot" and "cold" are relative and should not be taken as their normal meaning! Spark plug temperature ranges are fairly small in real terms so fitting the next grade down or up will not significantly affect engine operation unless you are using it for racing, or running the engine constantly at its peak/max capability. rgds Georigg Thanks for that Link to comment Share on other sites More sharing options...
garethr Posted March 20, 2008 Share Posted March 20, 2008 Colder is safer than hotter...... Too cold and the engine might be reluctant to start or misfire when cold. Too hot and you might melt a plug and hole a piston. Link to comment Share on other sites More sharing options...
Tones Posted March 20, 2008 Share Posted March 20, 2008 if it runs good ur laughing, dont try and fix what aint broke Link to comment Share on other sites More sharing options...
Alex C Posted March 20, 2008 Share Posted March 20, 2008 I have them and they've been fine for 3K or so, possibly a tiny bit longer to start from cold but it could be just in my mind. No problems at 1.3bar BPU, my previous IK22's were starting to splutter. Link to comment Share on other sites More sharing options...
Hermit Posted March 20, 2008 Share Posted March 20, 2008 Too cold won't get hot enough to burn carbon deposits off the tip. Too hot will overheat, causing blistering of the ceramic and erosion of the tip. As Gareth said, this is worse than too cold. The heat can cause pre-ignition and/or the bits that come off can cause damage. If neither of these signs are visible after the plugs have been in a while, they're ok. Of course, if you don't use full throttle once in a while the carbon will build up regardless of the plug's rating. That's my excuse anyway NGK tech info... http://www.ngksparkplugs.com/techinfo/spark_plugs/techtips.asp?nav=31000&country=US Link to comment Share on other sites More sharing options...
wile e coyote Posted March 20, 2008 Author Share Posted March 20, 2008 Thats good as im allways on full ,bloody over boost note for shopping list this year Full BPU Link to comment Share on other sites More sharing options...
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