Ford 3.9L Cast Pistons

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Engine:   3.9L SOHC OHV 12v
Capacity:   3949cc
Cylinders:   6
Bore Size:   91.86mm/3.62in
Stroke:   99.31mm/3.91in

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  Piston Assembly Set
Part # 6MKRY9390 (includes pre-gapped Piston Rings)
Sizes available: STD, 0.5, 1.0
 Piston Information  Piston Ring Information
Piston Type Cast Pre­gapped Ring Set Part # M9106
Compression Height 35.5mm/1.397in Sizes Available: STD, 020, 030, 040, 060
Piston Crown Capacity 11cc File Back Ring Set Part # N/A
Dish Sizes Available: N/A
Bowl Depth -1mm Ring 1 Ring 2 Ring 3
Rod Length 6.057in/149.35mm Type

Barrel plain

Moly Coated

Reverse torsional taper face scraper Duraflex 3 piece oil ring
Compression Ratio at
Total Clearance Volume 		9.8:1 at 76cc Width 1.5mm/0.059in 1.5mm/0.059in 3mm/0.118in
Piston Crown Thickness 9mm Depth 3.43mm/0.135in 4mm/0.157in 3mm/0.118in
Piston Mass 455 grams (1.0)



Pin Mass 105 grams
Pin Diameter 23.17mm/0.912in
Pin Locking Device
 Press Fit
Clearance Stamped on piston crown
Skirt Coated No

 
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