Volvo RWD 120-130 Forum

INDEX FOR 1/2026(CURRENT) INDEX FOR 11/2010 120-130 INDEX

[<<]  [>>]


 VIEW    REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

B20F head: how much to remove for compression? 120-130

uid 32173's pic
posted by  Gary L on  Wed Jul 20 04:56 CST 2011
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Wed Oct 22 10:26 CST 2014
[RELATED]

If (I repeat... IF) the combustion chambers on the E and F heads are the same basic shape, the shop manual numbers would indicate...

B20E - 3.34" head thickness, 10.5:1 cr
B20F - 3.42" head thickness, 8.7:1 cr

... and since you're essentially going after a cr that is the midpoint between the two stock examples, it would appear to calculate a target thickness of around 3.38", or about .030" off your current thickness.

FWIW, I have measured stock B20E heads at around 46cc, so our combined math seems to correlate fairly closely.
--

Gary L - 142E ITB race car, 73 1800ES
BlueBrick Racing Website
YouTube Racing Videos






THREADED THREADED EXPANDED FLAT PRINT ALL
MESSAGES IN THIS THREAD

New B20F head: how much to remove for compression? [120-130]
posted by  red92s subscriber  on Tue Jul 19 20:33 CST 2011 >


<< < > >>



©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.