I have a experiment I want to perform. I want to make a diesel from one of these two engines. Which do you think would make a better one? The 22re is Aluminum which I think is not as good a material for a diesel.Since it doesn't retain heat as good it is less desirable? The 22re is easier for me to rebuild and convert because it needs less work for it to happen. The /6 is in need a a bunch of work for the rebuild but I don't think that matters as much as which would make a better diesel. The reason I am asking about these two engines is I already have them. As far as an application it is for a homemade generator.