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What kind of fuel, 1990 Bronco 351w?

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What kind of fuel, 1990 Bronco 351w?

 
  #1  
Old 12-14-2018, 04:42 PM
1990FRANKENTRUCK
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Question What kind of fuel, 1990 Bronco 351w?

Hey all, I have been filling up my bronco with regular fuel, but was wondering if I would benefit at all from higher octane fuel?

The reason I ask is I work on old Volkswagens quite often, and know for a fact that with those old flat 4s, the higher cost of high octane fuel is cancelled out by how much better the engines run on it, and they actually will get more kms to a tank as well.

That being said, I am unsure of what is even recommended from the factory for my bronco. So, what are your experiences with different fuels in your 351w?

One more thing, I have read in a few places that if I advance the timing a bit (say from 10 to 14) and run higher octane fuel, I will get a little power gain. Is there any truth to this?

Thanks in advance

Zach



 
  #2  
Old 12-15-2018, 03:07 PM
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I run high octane, seems to run better.
 
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Old 12-15-2018, 05:14 PM
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These motors were designed around 87 octane so there is no need to run higher octane in a healthy all stock motor. Of course with age and wear carbon buildup in the combustion chambers can make it prone to pre ignition and then higher octane will help but that is more of a bandaid fix that doesn't address the real problem. Advancing the base ignition timing a few degrees does produce more torque and if you combine that with higher octane the timing can be advanced even more for a little more gain.
 
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Old 12-19-2018, 10:24 AM
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Awesome, thanks for the info! Exactly what I was hoping to know.
 
 


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