Brian Crower

Mitsubishi 4G63 Evolution VIII

The Lancer Evolution or "Evo" is Mitsubishi's flagship sports car. Based only on the unibody of the domesticated Lancer sedan the Evo is a rally inspired, turbocharged, all wheel drive, durable and finely tuned automobile. The number designation of the model is most commonly a roman numeral. Evolution models prior to version V were the officially approved models for Mitsubishi's efforts in the World Rally Championship's Group A class and SCCA Pro Rally Championship. In order to follow these rules, the Evolution is based on the same platform as the Lancer, but is much more powerful and the only major part in common between the Evo and the Lancer is the unibody. Nine street versions of the Evolution have been produced from 1993 up to today. Evolution versions VI, VII, VIII and IX did not need to meet WRC homologation requirements. The Evo was originally intended only for Japanese markets but demand on the 'grey import' market led the Evolution series to be offered through limited type-approval in the United Kingdom and in various European markets from around 1998 (Evo V-VI). Mitsubishi decided to export the eighth generation Evolution to the United States in 2003. The Lancer Evolution VIII is the first Evolution to come to the United States. These cams are not interchangeable with the traditional 4G63 found in the US based Eclipse and earlier Evo models.

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.	BC0111 106°	272°/272°	206°/206°	.415"/.388"	10.54/9.86	BC0100
	Race Specification Longer duration profile, added rpm potential. Intended for fully built engine. Tuning and ECU mods recommended. Requires kit BC0100.	BC0112 106°	280°/280°	218°/216°	.425"/.408"	10.80/10.36	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.	BC0113 106°	288°/288°	222°/220°	.468"/.478"	11.88/12.14	BC0100
	USDM 4G63 (Evolution VIII)	Stock	248°/248°	200°/200°	.386"/.367"	9.80/9.32

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" @ 95 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 EVOVIII 2.4L STROKER KIT
4G64 BLOCK 2.6L

• BC 4340 billet steel, 7 bolt crankshaft (102mm stroke).
• 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 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.
BC0108	BC5109	BC6108	BC7109	102mm stroke w/BC625+
BC0109	BC5109	BC6109	BC7109	102mm stroke w/bROD
BC0110	BC5110	BC6110	BC7110	106mm stroke 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. All new 4G64 block with 4G63 head recently added... 2.6L

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

 

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