Peter,
I may be have stepped out of line by moving this thread off topic. It was orignally intended to set up a group purchase for the RX7 summer unit we discontinued.
If you don't mind. I would like to correct this by putting this very interesting contribution by yourself on the "injection mixtures" forum. I would also like to discuss Frank walker's research paper of water/alcohol injection. I believe I have posted the link here somewhere.
Found it:
http://enginehistory.org/Frank%20WalkerWeb1.pdf