Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo Auction Link (800) 853-2651

Shop Now

   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

Farmall & IHC Tractors Discussion Forum
:

Avgas

Welcome Guest, Log in or Register
Author 
On2Wheels

07-06-2005 20:13:56




Report to Moderator

I have started using 100 octane Avgas in my Farmall M tractor. Are there any pitfalls I should be aware of. I use the tractor for pulling only.




[Log in to Reply]   [No Email]
Red4Life

07-07-2005 16:40:26




Report to Moderator
 Re: Avgas in reply to On2Wheels, 07-06-2005 20:13:56  
Octane ratingings tell you at what compression the fuel will fire without a spark. The lower the rating the lower the compression, the higher the rating the higher the compression it takes to force the fuel into combustion with no spark. Octane has NO effect on engine horsepower. The only reason to switch to a higher octane fuel is when the carbon buildup on the head and/or piston causes the the compression of the cylinder to increase to the point that it causes the fuel to combust before the spark. This pre-mature combustion can and does occure before the cam closes the valves fully and will cause what is comonly called "SPARK KNOCK". Only when you hear spark knocking should you upgrade your octane ratting, and should consider cleaning the head. Again octane rattings do NOT represent potential Hp only money wasted in the stack.

[Log in to Reply]  [No Email]
randy hall

07-07-2005 17:36:10




Report to Moderator
 Re: Avgas in reply to Red4Life, 07-07-2005 16:40:26  
carbon deposits in the combustion chamber do not increase compression and cause spark knock. the carbon deposits are hot and act like a glow plug and ignite the fuel charge before the proper time. this is why in the really old big tractors that burnt kerosine they injected water into the intake to stop the knocking. the old rumley oil pulls used almost as much water as fuel.



[Log in to Reply]  [No Email]
Sloroll

07-07-2005 03:33:11




Report to Moderator
 Re: Avgas in reply to On2Wheels, 07-06-2005 20:13:56  
For pulling only no. After continued use you may find your valves burning a little harder than they would with auto gas. Many put hardened seats and valves in the old engines for 100LL use. Being a leaded fuel be sure to keep an eye on your plugs for lead deposits. It will look like little molten BBs in them. That won't happen fast but being a puller I'd check those plugs occasionally to stay at the top of your game. 100LL is great too for you won't have to wory about varnish. 100LL has a shelf life of three years. Auto gas starts breaking down in 2 weeks. Not two weeks in your tank either. That is two weeks from manufacture. I put Av Gas in everyting I own over the winter.

[Log in to Reply]  [No Email]
Nat

07-07-2005 08:09:22




Report to Moderator
 Re: Avgas in reply to Sloroll, 07-07-2005 03:33:11  
Wait a minute... I thought you had to put hardened valves and valve seats in for UNleaded auto gas, not for leaded avgas.



[Log in to Reply]  [No Email]
Sloroll

07-07-2005 08:36:47




Report to Moderator
 Re: Avgas in reply to Nat, 07-07-2005 08:09:22  
It is low lead (LL). Lower levels than 80/87 and certtainly lower levels than an old tractor ran on. I assume a puller would be burning hotter than the average old farm tractor but if I am wrong I stand corrected. I know in aircraft engines valves and seats were changed accordingly as the older higher leaded lower octain fuels dissapeared.



[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:


TRACTOR PARTS TRACTOR MANUALS
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 ]

Home  |  Forums


Copyright © 1997-2023 Yesterday's Tractor Co.

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.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy