Vanagon EuroVan
Previous messageNext messagePrevious in topicNext in topicPrevious by same authorNext by same authorPrevious page (April 2000, week 4)Back to main VANAGON pageJoin or leave VANAGON (or change settings)ReplyPost a new messageSearchProportional fontNon-proportional font
Date:         Mon, 24 Apr 2000 15:58:32 -0700
Reply-To:     Stuart MacMillan <stuart@COBALTGROUP.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Stuart MacMillan <stuart@COBALTGROUP.COM>
Organization: The Cobalt Group
Subject:      Re: New High Power Subaru Boxer Engines
Comments: To: Andrew Grebneff <andrew.grebneff@STONEBOW.OTAGO.AC.NZ>
Content-Type: text/plain; charset=us-ascii

There are some interesting tweaks on this engine: Dual stage intake and exhaust!

As far as an all gear cam driving system goes it would be more expensive, complicated to make, and heavier on an opposed four with four cams than an in-line engine. LOTS of gears would be needed, all fitting together to close tolerances.

More info from the Subaru Web site (how many years before Kennedy makes a kit?!! This mod would be worth the trouble.)

All-New High-Ouput Engine The horizontally opposed layout gives the Subaru H6-3.0 powerplant inherent smoothness without the need for power-robbing balance shafts used in some V-6 engines. Liquid-filled engine mounts contribute to the smooth, quiet ride. The horizontally opposed design also provides a lower center of gravity which enhances handling and performance.

The new Subaru high-output H6-3.0 features an aluminum crankcase, double-overhead camshafts and four valves per cylinder. A direct ignition system uses an individual ignition coil for each cylinder, eliminating the need for a distributor and sparkplug wires. The engine displaces 2,999 cubic centimeters (183 cubic inches) and produces 212 horsepower at 6,000 rpm and 210 lb.-ft. of peak torque at 4,400 rpm. By 2,200 rpm, the Subaru H6-3.0 engine is already producing a substantial 174 lb.-ft. of torque, providing quick response at lower speeds.

The H6-3.0 produces nearly 30 percent more horsepower and torque than the 165-horsepower 2.5-liter H-4 in the Outback Limited model, yet is only 20 millimeters (0.8-inch) longer than that four-cylinder engine. Like all Subaru models the new Outback H6-3.0 models run on regular fuel, but 91 octane is recommended for maximum performance.

Dual-Stage Intake And Exhaust The new Subaru H6-3.0 uses a variable intake manifold and a dual-stage muffler to optimize power delivery throughout the engine speed range. Low-speed and mid-range power have not been compromised for high-rpm power, and vice versa. The variable intake manifold features an induction control valve that provides two intake characteristics. Below 3,700 rpm the valve remains closed to create a long intake runner length, helping to boost low-end and mid-range power. When the valve opens above 3,700 rpm, the manifold creates a "scavenging" or light supercharging effect, allowing each cylinder to catch high-pressure waves of intake air bouncing off the opposite side of the manifold.

A mechanical valve in the rear muffler varies muffler volume to help enhance engine power in different speed ranges. At lower engine speeds (around-town driving, for example), the valve remains closed to provide a smaller-volume muffler chamber. The resulting level of exhaust back-pressure enhances power at these speeds. When exhaust pressure reaches about 22 psi -- which occurs at about 2,400 rpm -- the valve opens to allow exhaust gas through an additional chamber. The resulting increased muffler volume reduces exhaust back-pressure, enhancing power at higher speeds. Muffler valve operation does not affect the noise level.

-- Stuart MacMillan Manager, Case Program 800-909-8244 ext. 8208 Fax: 206-269-6360

Getting your share of the Net yet? http://cobaltgroup.com http://UsedEquipNet.com


Back to: Top of message | Previous page | Main VANAGON page

Please note - During the past 17 years of operation, several gigabytes of Vanagon mail messages have been archived. Searching the entire collection will take up to five minutes to complete. Please be patient!


Return to the archives @ gerry.vanagon.com


The vanagon mailing list archives are copyright (c) 1994-2011, and may not be reproduced without the express written permission of the list administrators. Posting messages to this mailing list grants a license to the mailing list administrators to reproduce the message in a compilation, either printed or electronic. All compilations will be not-for-profit, with any excess proceeds going to the Vanagon mailing list.

Any profits from list compilations go exclusively towards the management and operation of the Vanagon mailing list and vanagon mailing list web site.