Contour Enthusiasts Group Archives Forums General General A long time since I have posted here

I need the help of your membership. I have a '97 GL Bi-Fuel Zetec that runs on natural gas most of the time. Within the last few months I've lost compression on the end cylinders, down to around 30 -> 65 psi. I don't think this is a ring problem as the oil level never goes down as I would expect from wall or ring wear or breakage. The engine has 67K and early in it's life the head was milled to true the surface.
I am suspecting a warped or burnt valve surface and my question is: Is the Bi-Fuel head the same component as the gasoline engine head assembly. From what I researched on RockAuto.com they are the same part # but seeing as this is a bit of a rare bird, I'm coming to the well of knowledge to help me confirm this.

Brad

I don't know for sure on the 2.0L Zetec, but typically the differences between a standard gas head, and a flex-fuel head is the engine valves and seats. The flex-fuel valves and seats tend to be made of a different material to improve wear when using the E85 fuel.

For all practical purposes, you are very likely to be just fine using a standard head in your situation.

The car he is speaking of does not run e85, it runs cng ... natural gas. So it would be different than a vehicle set up to run e85.



I have never seen any part numbers as far as the cylinder heads and valves go for the bi-fuels, so I expect them to be identical to regular zetecs.