Contrails ! Rotax 914 spark plugs

 

 

Interpretation

 

Specifications

The Denso X27EPR-U9 spark plugs have an M12 thread with 19 mm reach (with gasket), and a 1.5 mm projected U-cut ground electrode. These plugs are resistive, the hexagon size is 18 mm, and the Denso heat range is 27. Nominal gap is 0.9 mm.

 

Deciphering Denso references

 

 

 

Thread Diameter and Hex Size Thread Diameter x Hex Size (mm) M --- 18 x 25.4 (Reach: 12mm) L --- 18 x 22.2 (Reach: 12mm) MW --- 18 x 20.6 (Reach: 12mm) MA --- 18 x 20.6 (Tapered seat, Reach: 12mm) FK+ --- High Ignitability Plug (0.55mm Ir center electrode, Pt ground electrode) J* --- 14 x 20.6 (Projected plug) K+ --- 14 x 16.0 (Miniature plug) KJ*+ --- 14 x 16.0 (Projected miniature plug) LP* --- 14 x 20.6 (Plug for LPG applications) P* --- 14 x 20.6 (Platinum plug) PK* --- 14 x 16 (Miniature platinum plug) PKJ* --- 14 x 16 (Projected miniature platinum plug) PQ* --- 14 x 16 (Miniature platinum plug) Q* --- 14 x 16 (Miniature plug) QJ* --- 14 x 16.0 (Miniature projected plug) QL* --- 14 x 20.6 (Miniature long cylinder housing plug) S* --- 14 x 20.6 (0.7mm diameter iridium) S --- 14 x 20.6 (Surface gap plug (for RE engines)) SK+ --- 14 x 16 (0.7mm diameter miniature iridium plug) SKJ*+ --- 14 x 16 (Projected 0.7mm diameter miniature iridium plug) SV --- 0.4mm diameter iridium with platinum ground electrode T --- 14 x 16.0 (Tapered seat) TR@ --- 14 x 20.6 (For marine applications) W --- 14 x 20.6   --- 14 x 19.0 (Compact type) X --- 12 x 18.0 mm XE --- 12 x 14.0 XU --- 12 x 16.0 U --- 10 x 16.0 U --- 10 x 14.0 (U20M-U Only) N --- 10 x 16.0 Y --- 8 x 13.0 Z --- 1/2PF x 23.8 Z --- 0.55 mm diameter iridium * --- Reach: 19.0 + --- ISO compatible @ ---Reach: 12.7

 

 

Heat Range   DENSO NGK CHAMPION BOSCH 9 2 18 10 14 4 16,14 9 16 5 12,11 8 20 6 10,9 7,6 22 7 8,7 5 24 8 6,63,61 4 27 9 4,59 3 29 9.5 57   31 10 55 2 32 10.5 53   34 11     35 11.5

 

 

Reach   A --- 19mm (Electrode position: 7mm)   --- 21.5mm B --- 19.0mm (Electrode position: 9.5mm C --- 19.0mm (Electrode position: 5.0mm) D --- 19.0mm (Shroud: 2mm) E (with gasket) --- 19.0mm 20.0mm E (Taper seat) --- 17.5mm F --- 12.7mm FE --- 19.0mm (Half thread) G --- 19.0mm (Shroud: 2.8mm)   --- 19.0mm (Shroud: 3.0mm) H --- 19.0mm (Electrode position: 8.5mm)   --- 26.5mm L --- 11.2mm M --- 8.6mm N (Taper seat, HALF THREAD) --- 17.5mm V (Tapered seat) --- 25.0mm None --- 9.5mm 11.2mm 19.0mm 21.5mm None (Tapered seat) --- 8.3mm 11.2mm 11.2mm

 

 

Shape (Type)   A --- Double ground electrodes A --- Oblique ground electrode (For racing) AY --- Double ground electrodes with bent shape (special) B --- Triple ground electrodes BG --- Triple ground electrodes (shrouded) D --- Quadruple ground electrodes K --- 1mm Insulator projection LM --- Compact type (Hex size: 20.6mm) M --- Shortened insulator head length M --- Compact type (Hex Size: 19.0 mm) N --- Racing type (Nickel electrode) Pt --- Racing type (Platinum electrodes) P --- Projected (1.5 mm projection) S --- Non-projected (0 mm projection)   --- Iridium on a single side T --- Double ground electrodes TM --- Double ground electrodes TN --- Double ground electrodes V --- Slant ground electrode X --- Fully projected (2.5mm projection)

 

 

Internal Construction   R --- With Resistor None --- Without Resistor < Exception > S29A, S29 both have Resistors

 

 

Type Shape (Type) -A --- Special specification -B --- Special specification -C --- Cut-back ground electrode -E --- Special specification -F --- Special specification -G --- Grease applied on to threads, for CNG applications -GL --- Platinum center electrode -L --- For CVCC, with a withdrawn insulator   --- 3.5mm projected insulator for motorcycles   --- Withdrawn insulator for motorcycles   --- Thin center electrode for motorcycles   --- Heat resistant ground electrode -M --- Larger ground electrode -N --- For Yamaha and Kawasaki -P --- Ground electrode has a double layer of platinum   --- Center or ground electrode has platinum -S --- Semi-surface gap discharge type -S --- Stainless gasket -TP --- Platinum on center electrode, with taper cut ground electrode -U --- U-cut ground electrode -US --- Star-shaped center electrode is used -V --- 0.7mm diameter platinum alloy center electrode -Z --- Taper cut -ZU --- ZU Plug

 

 

Gap   5 --- 0.5mm (.020'') 8 --- 0.8mm (.032'') 9 --- 0.9mm (.035'') 10 --- 1.0mm (.040'') 11 --- 1.1mm (.044'') 13 --- 1.3mm (.050'') 14 --- 1.4mm (.055'') 15 --- 1.5mm (.060'') 20 --- 2.0mm (.080'') < None > Cars: 0.8mm M.C: 0.7mm < Exceptions > P16R, PQ16R, PQ20R are 1.1mm

 

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