Brian Crower

Mitsubishi 4G63

The Mitsubishi Eclipse has been in production since 1989 and is produced solely for the United States and Canadian market, where it has also been built as the Eagle Talon and the Plymouth Laser through Mitsubishi Motors Corporation's close relationship with the Chrysler Corporation (now DaimlerChrysler) known as Diamond Star Motors, or DSM. The first generation Mitsubishi Eclipse was available in four trim levels in both FWD and AWD models, but all were equipped with the 4G63 engine, most in the turbocharged (4G63T) variety. The 1st Gen engine (6 bolt crank) was used from 1989-1992. The second generation engine (7 bolt crank) was introduced in 1993, but used in the 1st Gen chassis through 1994. In 1995 there was a major update in styling, including a convertible model called the Spyder. The 7 bolt, 4G63 engine was used until 1999. Both the 1st Gen and 2nd Gen 4G63 engines use the same camshafts, however do not confuse the 4G63 engine with the non-turbo, 420A Chrysler engine that was used in the base FWD Eclipse from 1995 to 1999.

Stage	Description	Cam #	Adv. Dur.	Dur @ .050	Lift (in)	Lift (mm)	Kit #
	Street/Strip Specification Plug and play application. Short duration for nice street manners, slight lope at idle. Excellent all purpose spec. OEM spring OK.	BC0101 106°	272°/272°	212°/212°	.401"/.381"	10.18/9.66	BC0100
	Street/Strip Specification Longer duration profile, added rpm potential. Intended for fully built engine. Tuning and ECU mods recommended. Requires kit BC0100.	BC0102 106°	280°/280°	218°/216°	.422"/.418"	10.71/10.60	BC0100
	Full Race Specification Giant lift profile intended for those looking to achieve huge power numbers at high rpm. Requires extensive tuning and modifications. Requires BC0100.	BC0103 106°	288°/288°	222°/220°	.468"/.478"	11.88/12.14	BC0100
	USDM 4G63 (Eclipse/Talon Turbo)	Stock	248°/248°	200°/200°	.349"/.350"	8.86/8.89
	USDM 4G63 (Eclipse Non Turbo)	Stock	256°/248°	208°/204°	.365"/.349"	9.27/8.86

Rocker Ratio: 1.7:1

VALVE SPRING/RETAINER KIT
Designed for high rpm, BC valve springs are wound from only the highest grade, super clean, chrome silicone alloy and feature proprietary processing procedures for consistent pressures. BC titanium retainers are CNC machined from 6AL4V round bar titanium to exacting tolerances.

Kit #	Spring #	Retainer #	Description
BC0100	BC1100	BC2100	Single spring, titanium retainer

Spring Pressure:
BC1100 Seat: 1.550" @ 84 lbs / Open: 1.000" @ 235 lbs / Coil Bind: 0.935" (no machine work required)

STAINLESS STEEL VALVES
BC valves are made from premium stainless steel, fully machined and swirl polished for ultimate air flow. Dished head for added weight savings and increased valve control at high rpm. Standard and oversize head.

Part #	Description #
BC3100	34.0mm Intake (standard head diameter)
BC3101	30.5mm Exhaust (standard head diameter)
BC3102	34.5mm Intake (+.5mm head diameter)
BC3103	31.0mm Exhaust (+.5mm head diameter)
BC3104	35.0mm Intake (+1mm head diameter)
BC3105	31.5mm Exhaust (+1mm head diameter)

4G63 ECLIPSE 2.4L STROKER KIT
4G64 BLOCK 2.6L

• BC 4340 billet steel, 7 bolt crank (102mm stroke) or 4340 6 bolt (102mm)
• BC 4340 steel Econo or Pro Series billet rods w/ARP 220,000 psi fasteners.
• CP aluminum forged pistons (any bore size, any compression ratio).
• 5100 Series nickel carbon steel alloy wrist pins. 9310 pin upgrade available.
• Ductile iron plasma top rings, tapered second ring, low tension oil rings.
• ACL Race Series bearings sold seperately.
• Fully system balanced and ready to install.

Kit #	Crank #	Rod #	Piston #	Desc.
BC0105	BC5105	BC6104	BC7105	102mm stroke, 6-bolt w/BC625+
BC0106	BC5105	BC6105	BC7105	102mm stroke, 6-bolt w/bROD
BC0108	BC5109	BC6108	BC7109	102mm stroke 7-bolt w/BC625+
BC0109	BC5109	BC6109	BC7109	102mm stroke 7-bolt w/bROD
BC0110	BC5110	BC6110	BC7110	106mm stroke 7-bolt w/ 4G64 block

The BC stroker kit for the Mitsubishi 4G63 engine platform incorporates a 102mm stroke, 7 bolt crank. Depending on bore size that you decide, the BC kit will take you up to a 2.4L with 86mm bore. The 4G63 kit utilizes premium steel billet connecting rods. As usual, each BC kit features custom CP pistons, highest quality, steel alloy wrist pins, full ring pack and buttons. Econo rods are rated up to 600 maximum horsepower, Pro Series rods rated to 800+ horsepower.

Stock Specifications:
4G63 85mm Bore x 88mm Stroke - 9.010" Block Height
4G64 86mm Bore x 100mm Stroke - 9.252" Block Height

 

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