This site is not affiliated with AGCO Inc., Duluth GA., Allis-Chalmers Co., Milwaukee, WI., or any surviving or related corporate entity. All trademarks remain the property of their respective owners. All information presented herein should be considered the result of an un-moderated public forum with no responsibility for its accuracy or usability assumed by the users and sponsors of this site or any corporate entity.
The Forum Parts and Services Unofficial Allis Store Tractor Shows Serial Numbers History
Forum Home Forum Home > Other Topics > Pulling Forum
  New Posts New Posts
  FAQ FAQ  Forum Search   Events   Register Register  Login Login


Octaine fuel ?
 Post Reply Post Reply
Author
Message
  Topic Search Topic Search  Topic Options Topic Options
Macon Rounds View Drop Down
Orange Level
Orange Level
Avatar

Joined: 18 Feb 2010
Location: Pittsburgh Pa
Points: 2145 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Macon Rounds Quote  Post ReplyReply Direct Link To This Post Topic: Octaine fuel ?
    Posted: 29 Aug 2019 at 12:35pm
What Octane fuel is needed to support 175 PSI cylinder pressure ? 
The Allis "D" Series Tractors, Gravely Walk behind Tractors, Cowboy Action Shooting !!!!!!! And Checkmate
Back to Top
Sponsored Links


Back to Top
tbran View Drop Down
Orange Level
Orange Level


Joined: 14 Sep 2009
Location: Paris Tn
Points: 3297 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tbran Quote  Post ReplyReply Direct Link To This Post Posted: 29 Aug 2019 at 1:23pm
as a rule of thumb - excluding modified cams, a 10:1 CR would be approx. 150 PSI... so you have 12:1 CR ?  IF so, assuming a tractor engine since posted here  and  a low RPM engine you are going to lug, about as high as you can find?    E85 or aviation fuel....   most engines with high CR 's in automotive use have knock sensors to retard timing.  Be careful.... IMHO

Edited by tbran - 29 Aug 2019 at 1:24pm
When told "it's not the money,it's the principle", remember, it's always the money..
Back to Top
DrAllis View Drop Down
Orange Level Access
Orange Level Access


Joined: 12 Sep 2009
Points: 20528 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 29 Aug 2019 at 1:39pm
That kind of compression is the exactly same as a 170/175 tractor and 87 octane is minimum and timing cannot exceed 25 degrees BTDC at full throttle. In fact 23 degrees BTDC is probably better. You'd do yourself a favor running 89 octane.

Edited by DrAllis - 29 Aug 2019 at 1:39pm
Back to Top
Macon Rounds View Drop Down
Orange Level
Orange Level
Avatar

Joined: 18 Feb 2010
Location: Pittsburgh Pa
Points: 2145 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Macon Rounds Quote  Post ReplyReply Direct Link To This Post Posted: 29 Aug 2019 at 5:01pm
Thanks for the info.....
 
I had been running 100 octane low lead Avgas but its not always convenient to get.
 
Thanks again.
The Allis "D" Series Tractors, Gravely Walk behind Tractors, Cowboy Action Shooting !!!!!!! And Checkmate
Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 11.10
Copyright ©2001-2017 Web Wiz Ltd.

This page was generated in 0.063 seconds.


Help Support the
Unofficial Allis Forum