Why not a heat tape wrapped around the oil supply lines? That would heat the oil in the line and may give it enough to start easier. The flash point is pretty low, "Number 2 fuel oil has a flash point of 52 °C (126 °F)"
From, https://en.wikipedia.org/wiki/Heating_oil


Or start on Kero and switch over after heat is built into the furnace. I'd never use gasoline.

Well when I say gasoline I meant as a preoil thinned mix. Gas/oil mix as an ease of lighting and to guickly build heat to sustain oil only fuel. I do have other ideas for the spark generator but this is my primary goal for it. I was playing with the idea of a heat coil embedded in the outer layer of fire brick but I do worry it'll over heat. it has occurred to me the blower I'm using, conveniently has a heating element on it. A few turns of tubing directly in front of it would heat the oil nicely. Though I assume hot air intake wouldn't be as effective as cold dense air.

 

Though I assume hot air intake wouldn't be as effective as cold dense air.

That's what 'glow plugs' do in a diesel motor, heat the air in the intake to help start the motor.

 

That's what 'glow plugs' do in a diesel motor, heat the air in the intake to help start the motor.

Diesel glow plug purpose
Glow plugs are an engine management component that is found on vehicles equipped with diesel engines. Their purpose is to preheat, and help warm up the engine’s cylinders so that diesel combustion can occur more easily.

Cylinder's* kind sir. Specifically to aid in vaporizing the fuel. Once the engine is warm they typically shut off as combustion has since heated the cylinders enough to sustain vaporization. And since most modern diesel engines are turbo charged (to condense the air) the need to heat the air is redundant. Granted warm air would aid in vaporization, it suffers from less available oxygen. Gasses diffuse at higher temps. I suppose if I'm moving large cfm it would be OK but having a 20ton blower on a small 2 burner forge would be like a jet engine on the batmobile. Looks cool but c'mon. He's in a metropolis. A bicycle would suffice in that kind of traffic. I digress I see.

 

Waste lubricating oils hold many foreign metals. And all waste oils have foreign materials.

This can be detrimental in a forge flame. From what I read.

There are other modern additives now also. I'm guessing it will be a dirty flame.

And I have a feeling that if you try to use a inconsistent mixture of waste oils.......a lot of smoke.

Don't mean to be a downer. Maybe it could indirectly bake coke/charcoal.

 

Cylinder's* kind sir.

Where do you think the glow plugs are in an engine? Hint, they aren't in the cylinder.

modern diesel engines are turbo charged

Do you understand how a turbo charger works? Another hint, they don't do much or anything at low or especially starting speed.

 

Waste lubricating oils hold many foreign metals. And all waste oils have foreign materials.

This can be detrimental in a forge flame. From what I read.

There are other modern additives now also. I'm guessing it will be a dirty flame.

And I have a feeling that if you try to use a inconsistent mixture of waste oils.......a lot of smoke.

Don't mean to be a downer. Maybe it could indirectly bake coke/charcoal.

When I say waste oil I meant specifically waste cooking oil. Hot metal and bacon scented as God intended. I was vague on waste oil sourcing. My apologies

 

Where do you think the glow plugs are in an engine? Hint, they aren't in the cylinder.



Do you understand how a turbo charger works? Another hint, they don't do much or anything at low or especially starting speed.

In the cylinder no but the intent is to heat the cylinder/engine as a whole.

Where do you think the glow plugs are in an engine? Hint, they aren't in the cylinder.



Do you understand how a turbo charger works? Another hint, they don't do much or anything at low or especially starting speed.

The intent is the heat the engine as a whole but mostly the cylinder. Turbochargers increase air pressure and it does heat the air by compressing it but also to allow increased fueltoair for power.

 

In the cylinder no but the intent is to heat the cylinder/engine as a whole

Wrong. They heat the air in the intake to help get the engine started. Any heat they put in the block its self is not their intention.

Turbochargers increase air pressure and it does heat the air by compressing it but also to allow increased fueltoair for power.

Turbos use the exhaust to spin them and only really do anything at higher flows and RPMs.