One of the main reasons for mounting the vaporizer on the engine was heat. It keeps the regulator from freezing up. Even though you are sending liquid propane to the engine, the engine requires vapor to operate. Under heavy load quite a bit of propane is converted from liquid to gas and if you remember your physics it requires to to convert.

The vaporizer has coolant flowing thru it to assist with vaporizing. The propane tube going from the vaporizer to the engine in normal operation is hot.

I actually shortened the tube a bit from the previous location but mounted the vaporizer higher up the firewall with the outlet pointing down, that way any oil build-up will go straight into the engine and not foul the vaporizer.

BTW, the oil does not come from the engine, it is a residue out of the liquid propane.

quote:

Originally posted by MWrench:
BTW, the oil does not come from the engine, it is a residue out of the liquid propane.

I have always wondered if any of this oil accumulates in the propane tank. But not enough to remove and upend the tank.

The vaporizer and venturi had just about a teaspoon full of oil that I was able to get out, this is after 500+ hours of operation. Of course no way of telling how much oil was actually burned along with the propane vapor.

I was told the oil is added for corrosion issues in the tanks etc. I would imagine some oil will collect in the tank.

I got the vaporizer re-build kit but it is a complicated process and will require a test set up, I don't want to deal with this now so will do later this winter.

Still haven't gotten the governor settled down yet, works but when cold wants to hunt a bit.