Marvel Mystery Oiler

34pocho

34pocho

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Has anyone ever hooked up a Marvel Mystery Oiler on a Model A that feeds the cylinders through the manifold vacuum? I seen one for sale on eBay and was curious how it works.
 
There are two systems to inject MMO. That, what I use sprays the oil into the cylinders when the vakuum pressure under the carbureter ventury is low. That is when the engine is pushed without any drive work.

The other system, unfortunately I don't remember what it's called, injects oil at high power, that's the better way.
 

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I'm really not sure how injecting MM oil would be more effective than adding it to the fuel. I've seen it on Model As and its a comment item at a car show. Looks kind of vintage and "cool". MM oil in the fuel has advantages for the carb I'd think that a manifold injector would bypass. Just my thoughts. I have experience with MM oil doing good things for small engines.
 
eagle said:
I'm really not sure how injecting MM oil would be more effective than adding it to the fuel. I've seen it on Model As and its a comment item at a car show. Looks kind of vintage and "cool". MM oil in the fuel has advantages for the carb I'd think that a manifold injector would bypass. Just my thoughts. I have experience with MM oil doing good things for small engines.
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Eagle, what you write is entirely and completely correct! The addition to the fuel has the most efficient effect because the amount of fuel increases with the engine power. (Therefore I add 40 cm³ while taking fuel on the gas station.)

But there is something particularly pleasing to the eye about this old-fashioned MMO metering system, and I think it fits the Model A well. Isn't it?
 

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Werner said:
Eagle, what you write is entirely and completely correct! The addition to the fuel has the most efficient effect because the amount of fuel increases with the engine power. (Therefore I add 40 cm³ while taking fuel on the gas station.)

But there is something particularly pleasing to the eye about this old-fashioned MMO metering system, and I think it fits the Model A well. Isn't it?
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It does, very cool!
 
It is a pretty neat looking looking piece. And would be good with ATF for pickling the engine for the off season.
 
I had one on the 8ba in my '39 p/u. Problem was that I couldn't get the glass jar to seal. Made several different gaskets but never could stop it from leaking. Ended up taking it off. Its still on the shelf. Maybe this winter I'll give it another try.
 
51504bat said:
... Problem was that I couldn't get the glass jar to seal. Made several different gaskets but never could stop it from leaking. ...
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Was that rubber seals? In this application, cork gasket is the better way.

MMO contains synthetic ester oil and isoalkanes as well as cycloalkanes. These attack some plastics. Rubber seals swell and then become brittle.
 
OK, so i'm old and stupid, but help me understand.
what is the purpose of injecting the "MMO"?
Is it supposed to be injected into the intake manifold while the engine is running?
thanks
ou
 
Old Ugly,

MMO has two great characteristics. The ester oil is extremely temperature stable and supports the boundary lubrication on the valve stems and also the top dead center piston + cylinder.

The most important benefit is the addition of detergents. These loosen and burn soot and ash in the combustion chambers and on the valve tulips, spark plugs.

Since the old engines always burn a lot of oil and especially simple mineral oils leave behind a lot of residue crust, it is helpful to mix such additives with the gasoline in very small doses.

It also dissolves resin deposits etc. in the fuel tank and the pipes.
 
Werner said:
Old Ugly,

MMO has two great characteristics. The ester oil is extremely temperature stable and supports the boundary lubrication on the valve stems and also the top dead center piston + cylinder.

The most important benefit is the addition of detergents. These loosen and burn soot and ash in the combustion chambers and on the valve tulips, spark plugs.

Since the old engines always burn a lot of oil and especially simple mineral oils leave behind a lot of residue crust, it is helpful to mix such additives with the gasoline in very small doses.

It also dissolves resin deposits etc. in the fuel tank and the pipes.
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i take it that you like and use it?
how much would you dump into a full Model a fuel tank?
ou
 
Hi Ugly,

use approximately 1:400. That's 3.5 US fl oz on 11 gallons of fuel. Much more is not necessary and also not helpful.
 
Werner said:
Hi Ugly,

use approximately 1:400. That's 3.5 US fl oz on 11 gallons of fuel. Much more is not necessary and also not helpful.
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nice.
do you notice any difference with drivability or engine performance?
engine cleaner inside?

thanks
ou
 
The performance of the engine and its idling have remained unchanged.

The spark plug inner insulators are much cleaner. If you peer into the combustion chamber through the plug bores, you can see that all the residues gradually diminish over time.

Gerne gemacht!
 
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