Driving Your MEL Powered Vehicle On Today's Pump Gas

M-E-L Engine powered Mercury Car General Discussion
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Chris430
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Driving Your MEL Powered Vehicle On Today's Pump Gas

Post by Chris430 » Wed 9. Feb 2022, 09:46

Hello,
Can you get away with 87 octane, what elevation and climate do you run?
Thank's

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59lincolnrag
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Re: Driving Your MEL Powered Vehicle On Today's Pump Gas

Post by 59lincolnrag » Fri 4. Mar 2022, 16:20

I only use premium fuel in my MELs
Rev A 3/6/22
Octane?
Octane is simply a measure of how much heat and pressure a fuel can withstand before exploding, and in tandem with a properly designed engine a higher octane fuel can increase performance and efficiency while decreasing emissions.
Octane issues are usually related to how the engine behaves. With a newer vehicle, putting premium gasoline into one that’s rated for 87-octane usually will cost more money. You really don't get any benefit.
However, in a classic MEL car, you may want to stop at the pricier pump, regardless of what your engine was originally rated for.
First, Octane is not an additive. Second the amount of octane in fuel depends on how it’s refined. While high-octane fuel sounds like it has super power, it’s actually less volatile than 87-octane. That’s important in high-compression engines, where high heat can cause various points of detonation with lower-grade fuel, or worse, spontaneous combustion (ping or Knock) before the spark plug fires damaging your engine.
Knock is virtually unknown to modern drivers. This is primarily because fuels contain an oxygenate that prevents knock by adding oxygen to the fuel. This oxygenate is commonly referred to as octane.
Premium fuel resists pre-ignition, and creates an even flame that spreads through the chamber (this happens in a split-second). Older engines can be more susceptible to pre-ignition, and using premium fuel can help to prevent it.
As for additives you may want to do some research. Newer fuels do not give the upper engine/ valves proper lubrication. A good additive here will help. I use a marvelous mysterious oil added to my tank. There are others out there. An expensive valve job with hardened seats would help as well.
2002 Lincoln Blackwood
1959 Lincoln Continental Coupe blk on blk
430 Tri-Power Super Marauder
1959 Lincoln Continental Convertible wht on wht
2006 Lincoln Town Car

Chris430
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Re: Driving Your MEL Powered Vehicle On Today's Pump Gas

Post by Chris430 » Sat 5. Mar 2022, 06:20

So, depending on your area, you run 90-94 Octane. My routine trip is 574 miles from 434 feet above sea level to 4,000 at peak then to 3500 where I usually stay. It's not fuel injected yet so no compensation for knock except me getting out and backingnoff the timing. The FE's AFR drops to 12.1 at 3500 feet from 13.1 at 434 feet. The Quadrajet compensates ok through vacuum loss when going up. I'm expecting similar results with the MEL. With the MEL. 050" below deck I suspect the advertised 10.5:1 compression is more in the mid 9's. 91 Octane at the local Chevron was $4.14 a gallon. See where I am going with this.... What elevation do you drive the most?
Thank's

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59lincolnrag
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Re: Driving Your MEL Powered Vehicle On Today's Pump Gas

Post by 59lincolnrag » Sat 5. Mar 2022, 10:16

The highest elevation near me is 180 Ft.
Premium is 4.42 per gal.
20181020_125817.jpg
Burnt valves running low octane fuel in high performance engine. 5.4 DOHC 32 valve.
2002 Lincoln Blackwood
1959 Lincoln Continental Coupe blk on blk
430 Tri-Power Super Marauder
1959 Lincoln Continental Convertible wht on wht
2006 Lincoln Town Car

Chris430
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Re: Driving Your MEL Powered Vehicle On Today's Pump Gas

Post by Chris430 » Thu 10. Mar 2022, 12:26

You definitely ran contaminated fuel for a while. You can curve that by using stations that see a lot of traffic. Those stations tanks are circulated often enough for the fuel not to separate keeping water, Ethanol and contaminants suspended. Premium is refined better but some places around my area still have traces of Ethanol and water in their premium. That is according to a local machinist whom uses testing kit for his dyno gas. If you have a custom tuner on that car slighty fattening up the AFR will cool the combustion chamber some and probably slow down the damage done with this junk fuel we're getting these days.

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59lincolnrag
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Re: Driving Your MEL Powered Vehicle On Today's Pump Gas

Post by 59lincolnrag » Fri 8. Apr 2022, 06:09

Actually the burnt valves (root cause) were caused by an intake vacuum leak causing a lean mixture on the drivers side. The Intake valves were coated with bits of carbon after using Sea Foam. Low octane fuel only exacerbated the condition.
2002 Lincoln Blackwood
1959 Lincoln Continental Coupe blk on blk
430 Tri-Power Super Marauder
1959 Lincoln Continental Convertible wht on wht
2006 Lincoln Town Car

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