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



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

Re: Well? 700 1989

posted by  someone claiming to be tom kaylor on  Wed Nov 7 07:01 CST 2001 [RELATED]

My 87 turbo takes 91 RON (research octane number) which is equivalant to 87 AKI (antiknock index)which ,I believe, is the most common rating in the US. If your vehicle produces more power and gets better mileage on higher octane ratings it is likely to indicate some inaudible detonation may be occurring as the detonation in addition to damaging pistons,gaskets, valves,etc. will also reduce power since ignition and the flame front in the combustion chamber are essentially uncontrolled. This can result in the equivilant of overadvanced timing although it may have nothing to do with the static settings if they're even adjustable.

Higher octanes are resistant to detonation because they burn slower, they don't really unleash more power and there have been stories of cars not starting in the winter because of the slower ignition qualities of higher octane. If your manual says 89 AKI that's what I would use and the additive package might be just a little better too.

BTW AKI is a combination or average of RON and MON (motor octane number) RON tests low speed knock resistance while MON tests high speed resistance.





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.