The message to which you are about to reply is shown first. GO TO REPLY FORM



 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

Supercharging a B20 (AGAIN) 140-160

posted by  Phil S. on  Sat Jul 26 11:45 CST 2003
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Fri Oct 24 13:18 CST 2014
[RELATED]

I wouldn't want to use an E head for two reasons: 1) with 10.5:1 CR, it can be a challenge to tune them for 92-octane normally aspirated, let alone with boost, and 2) the exhaust ports don't flow as well as on the carb heads. With forced induction, the slightly larger intake valves on the EFI heads will do nothing much for you, while exhaust flow restrictions will cause you to hit a wall where more boost doesn't increase power.

If detonation is avoided, stock pistons are good for low boost levels. The B21 pistons are no stronger (head gaskets are available). You want to go to forged pistons for higher boost.

The C cam is a reasonable choice. You don't want a cam with much overlap, or the boost will blow the intake charge right out the exhaust ports.

I can't think of anything functionally wrong with the EFI intake manifold, except that it's big and doesn't leave much room for a supercharger.






USERNAME
Use "claim to be" below if you don't want to log in.
PASSWORD
I don't have an account. Sign me up.
CLAIM TO BE
Use only if you don't want to login (post anonymously).
ENTER CAPTCHA CODE
This is required for posting anonymously.
OPTIONS notify by email
Available only to user accounts.
SUBJECT
MODEL/YEAR
MESSAGE

DICTIONARY
LABEL(S) +
IMAGE URL *
[IMAGE LIBRARY (UPLOAD/SELECT)]

* = Field is optional.

+ = Enter space delimited labels for this post. An example entry: 240 muffler


©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.