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Octaine fuel ?
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Macon Rounds View Drop Down
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Joined: 18 Feb 2010
Location: Pittsburgh Pa
Points: 2147 		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
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tbran View Drop Down
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Joined: 14 Sep 2009
Location: Paris Tn
Points: 3299 		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..
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 20578 		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
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Macon Rounds View Drop Down
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Joined: 18 Feb 2010
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Points: 2147 		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
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