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Mitsubishi Lancer Evolution - Tech Knowledge

Upgrading The Cylinder Head, Valvetrain And Intake Manifold

Text By: , Sean Crawford, Photography by Sean Crawford, Staff
Mitsubishi Lancer Evolution Front View

Cam Timing And Piston-To-Valve Clearance
When selecting camshafts, we wanted a design that would offer a substantial power increase in the mid-range to upper rpm level, while maintaining good idle quality and low-speed drivability. Kelford's popular 272-degree duration camshafts fit our needs nicely, and the exhaust cam was coupled to a BDL adjustable cam gear sprocket. The camshafts are available off-the-shelf and have a good reputation for use in daily drivers.

AMS F1i Intake Manifold
After spending so much time perfecting the cylinder head, we knew the stock intake manifold wouldn't make the cut. We found the ideal solution in the AMS Performance F1i. AMS spent two years designing the new cast aluminum intake manifold with claims it will provide up to five percent more power than their popular VSR manifold. The extra engineering effort showed, as the F1i has many features pulled straight from the racing world. The manifold plenum contains large internal velocity stacks and tapered runners that keep air moving quickly and easily into the cylinder head, along with a larger throttle body opening that allows more air into the plenum, and can be fed by a stock Mitsubishi or 4.6L Mustang throttle body. Several accessories such as a custom dipstick tube, vacuum fittings and a stainless steel support bracket are also included.

Throttle Body
Our OEM Mitsubishi throttle body lacked the flow capacity we needed and was replaced with a factory version modified by Milspec. The factory throttle body bore was opened up from 60 to 65mm to allow airflow to match the opening of the AMS F1i intake manifold, and MILSPEC also replaced the throttle body shaft seals with upgraded versions that eliminate boost leak. The entire assembly is a direct replacement and operates like the original equipment.

HOTBOX
Automotive Racing Products
1863 Eastman Ave
Ventura
CA  93003
800-826-3045
www.arp-bolts.com
AMS Performance
1760 Metoyer Court
West Chicago
IL  60185
847-709-0530
www.amsperformance.com
ATI Performance Products
6747 Whitestone Road
Baltimore
MD  21207
877-298-5039
www.atiracing.com
Lucas Oil
302 North Sheridan Street
Corona
CA  92880
951-270-0154
www.lucasoil.com
Brian Crower
161 So Marshall Ave
El Cajon
CA  92020
619-749-9018
www.runbc.com
JE Pistons
15312 Connector Lane
Huntington Beach
CA  92649
714-898-9763
www.jepistons.com
Ferrea Racing Components
2600 N.W. 55 Court
Suite 234
Fort Lauderdale
FL  33309
888-733-2505
www.ferrea.com
LESCO Race Engine Development
n/a
AK
http://www.4-lesco.com
WPC Treatment
2909 Oregon Court
Unit C2
Torrance
CA  90503
310-782-8647
www.wpctreatment.com
ACL Performance
n/a
AK
http://www.aclperformance.com.au
BDL Belt Drives LTD
1959 N. Main St.
Orange
CA  92865
685-685-3333
www.beltdrives.com
Race Engine Systems
2897 Industrial Parkway
Santa Maria
CA  93455
805-878-8211
http://raceenginesystems.com/
By , Sean Crawford
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