Posted by Gene Dotson on March 19, 2008 at 18:01:32 from (69.88.222.62):
In Reply to: Water-Methanol boost posted by GeneMO on March 19, 2008 at 15:35:57:
The water injection (anti-detonation injection) was used to prevent the engine from destroying itself. The only purpose of the alcohol was to prevent freezing at altitude. Normal mixture was 70/30 in summer and 60/40 in winter. The supercharger was capable of producing more boost than the engine could handle at full military power so water was injected to retard initial pressure buildup that will cause detonation. the five minute limitation was that was the capacity of the ADI tank. The increase in power is due to the fact that water turned to staem actually has a higher pressure increase than burning gasoline... Gene
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