The current number is lower than the old number that included only the Research method. The current number is lower because it uses the average of the Research and Motor numbers. I added to the thread several pages back by now that the "new" method R+M/2 is 4-5 points lower than the Research method. BUT, other things being equal, in other words ignoring the improvement in todays gas over that of the 50's, research octane is about the same. TV says that the operators manual for the 706 says 93 octane (someone check that in their manual) -- that is the research number. Todays research number for 89 octane gas is also 93 maybe 94. Current 87 octane has an R number of 91 or 92. Motor will always be less than research, so the end result is that the current octane number posted on the pump is less that what would have been posted in the 50's -- if such a number was posted them. 93 octane on tdays pump would have an R number of 97 or 98.
This post was edited by CNKS at 18:12:39 10/21/11.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Fabrication (Who Me? Make it myself?) - by Chris Pratt. First of all, what are the reasons for not fabricatin your own parts? Most judgements on what should be purchased rather than fabricated stem from: Originality - If the tractor restoration is to be 100% original, it is likely that you should spend the time and money to locate the component in the used or New-old-stock market. Since this can be extremely difficult, you may want to fabricate the item or purchase a modern replacement temporarily, but eventually, you s
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
