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



 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

Compression difference between B230F and FT? 700

posted by  Blue Horse on  Sat Sep 16 09:16 CST 2006
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Mon Apr 8 17:57 CST 2013
[RELATED]

According to both the owners manual for an 86 740, and the Haynes book, compression is 8.7:1 for the Turbo, and 9.8:1 for the normally aspirated. Bore and stroke are identical. I think you will find the difference is in the pistons. The ones for the Turbo don't stick up quite as far, and therefore don't compress the mixture as much, though the stroke is the same.

The 83 "flat hood" 242 Turbo was a B21FT with higher than normal compression. It may have used the pistons of the B21F to achieve this. I'm not sure what other modifications were used to control pre-ignition (pinging) I don't think this engine had a knock sensor.

EGR works by lowering combustion temperatures. The intended purpose is to reduce NOx emissions.






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.