How much Marvel Mystery Oil per tank?

[1930-Pickup]

Originally Posted by Crankster

It has a mixture needle, it can't be that tough??




I doubt this very much

A quarter turn of the metering screw would set the flow rate from too much to too little.

Also, temperature variations would change the flow rate due to the nature of temperature changes acting upon the adjustable mechanical orifice (a common phenomenon with other similar mechanisms). On top of that, temperature changes also affect the viscosity and flow characteristics of oils in general.

The Ampco metering system did have a flow sight glass, but what can be seen though the sight glass is almost irreverent to the actual flow rate. So to see the resulting flow rate I had to wait many miles in order to calculate the dropped volume of MMO in the reservoir compared to the amount of fuel that was used.

On top of this, the Ampco system is not an inverse oiler, so it delivers MMO at rates opposite of the actual needed times.

Crankster- Hmm, I don't remember anyone else standing there watching me clean MMO off the reservoir.

That was my experience anyway.
I guess your experience with your Ampco system was different since you doubt the needle adjustment was a pain.