Also, the spark plug gap should never exceed .055" unless pre-set by the manufacturer. 239 cubic inch 1954: Champion H-18Y Spark Plug Gap: .035 in. THIS CROSS REFERENCE TABLE IS INFORMATIVE ONLY. Before doing any small engine repair or maintenance, be sure to check your manual for recommendations on specific parts numbers and safety precautions. On a conventional spark plug, it is the area between the center and the ground electrode. // ]]> Copyright © 2020 FORD CLASSICS — Activation WordPress theme by. Modern engines often turn the check engine light on with a misfire code (generally P03xx) with corresponding cylinder number when only as little as 10% misfire occurs, which is far before anyone will even feel that something is wrong or even think that a misfire is occuring. I believe I have all of the correct tools and equipment but am uncertain on the gap size for my spark plugs. SOURCE: spark plug gap spec. RS14YC6), Spark Plug Gap - understanding the basics. Electricity running through the plug will arc over the gap igniting the fuel in the engine. google_ad_client = "pub-3766400037069822"; /* Spark Plugs A (728x90) */ google_ad_slot = "2371573275"; google_ad_width = 728; google_ad_height = 90; High RPM applications also shorten the ignition coil saturation (on time or DWEL) resulting in less available energy. Generally the applications with low cylinder pressures (low compression ratio) running lean A/F (Air/Fuel) mixtures have large recommended gap (around .050"), and applications with high cylinder pressures (high compression, forced induction - turbo, supercharged, nitrous applications,...) require spark plug gap smaller than .032". Plug gap My A-Headed 605 works fine with .045 plug gaps. Higher fuel concentration has the same effect (lower A/F ratio). I'm using the sp-504 spark plugs. CD ignitions have very fast Voltage rise (short rise time) and therefore they also work very well with spark plugs that have high capacitance, such a spark plugs with multiple gaps and/or surface discharge spark plugs. Ford switched to motorcraft plugs in the 2015+ models and they are completely adequate for a stock ST. Also, the 0.040 gap on the NGK is generic. May 17, 2015. June 02, 2016. })(window,document,'script','//www.google-analytics.com/analytics.js','ga'); Price: Alternate: No parts for vehicles in selected markets. When changing the spark plugs, always ensure that the spark plug threaded portion of the shell (from the spark plug seat) is same length (or very close to) the O.E. Thank you. The spark plug gap adjustment should not be changed more than 3 times and should not exceed .008" in either direction. The exception are for example spark plug part numbers with gap that does not need to be adjusted and can not be changed, such as Brisk Premium Multi-spark plugs, Brisk Premium LGS Spark Plugs, Brisk Premium LGS-T spark plugs, Brisk Extra Turbo Spark Plugs and some others. In either way the spark will not occur between the spark plug electrodes inside the combustion chamber, and engine misfire will occur. // ... Thunderbird question spark plug gap setting will result in weakening of the spark.... Number has no trailing digits then ( for most part numbers ) it will be to. Ford explorer ; Original equipment is Platinum - spark plug gap correctly, you will find that you can if... Into size in mm was reduced to 1.0 mm Accel # 762 plugs ) spark plug gap chart ford my Thunder... Transposing directly into size in mm V8 2005 Tbird - ford 2005 Thunderbird question spark plug part has. Denso spark plugs for Champion spark plugs it is not uncommon to gain much. 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