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Gas

Need more info. If you don"t have the compression there is NO reason to spend 7 plus dollar a gal fuel. If its not over 200psi high oct pump gas will work. With that said trial and error to find what racing fuel works for your tractor.
 
I burn VP Q16 which is 116 motor octane and 120+ research octane.

What kind of tractor do you have and what are the specs of the engine?
 
If it is an electric start and you can get hold of a compression gage. take BOTH spark plugs out and check cranking pressure after it turns over enough times to stop building pressure and then let us know what the pressure is. As stated before here, unless you have 250 psi or better, there is no need of 112 octain fuel. You could easily run on E85 or Avgas if its under 250psi. Too much octain HURTS performance as it burns too slow.
 
(quoted from post at 17:48:56 09/25/12) If it is an electric start and you can get hold of a compression gage. take BOTH spark plugs out and check cranking pressure after it turns over enough times to stop building pressure and then let us know what the pressure is. As stated before here, unless you have 250 psi or better, there is no need of 112 octain fuel. You could easily run on E85 or Avgas if its under 250psi. Too much octain HURTS performance as it burns too slow.
Click to expand...

Thats not really true although it is what everyone assumes. I can't remember my compression but I do know that it is under 250. My engine was made to have lower compression so that I can run higher RPMs. And it runs like crap on VP blue (108) and avgas.

To the original poster: I would run VP Q16, it's the best fuel for big and bigger cubed Deeres IMO. Just makes sure you have a good fuel pump and carb to support the extra fuel flow. Also with Q16 with you can run alot of advance in your timing without detonating. It's also oxygenated so your getting alot of extra oxygen along with it. My G is only 580 cubes and I burn about a gallon of fuel every hook running at 2000 RPM.
 
we run an oliver 77, 420 cubic inch, 13.8 static compresion ratio with 310lbs. cylinder pressure on 110 vp with no problems.
 
Depends on cam timing, compression ,timing advance and everything else.
Lower compression has nothing to do with high rpm capability. It's all about matching airflow capacity, valve timing, mechanical compression ratio and desired rpm range.
 
(quoted from post at 18:52:36 09/25/12)
Lower compression has nothing to do with high rpm capability. It's all about matching airflow capacity, valve timing, mechanical compression ratio and desired rpm range.
Click to expand...

It does when your working with something that was only designed to run 1100 rpm. I know alot of guys that tried high RPM high compression Deere's and in the end ended up backing down the compression because they got tired of breaking 2 or more cranks in a season. Now that a guy has billet cranks to work with I guess you would not really have to worry about too much compression any more.
 
Atleast 116 in a 800ci Deere, as they are more susceptible to detonation than almost any other big motor in antique pulling. As far as big motors anyways.
I run 14.5:1 at 3k in a 8.125 by 4.75 B on alcohol.. It hasn't reached its full potential yet but i'd definetly say, if you can keep it together, more compression is definetly better when it comes making a motor run hard at higher rpms.
JMO
Derek Holdren
 
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