На А6М6 БЫЛА система впрыска водо-метаноловой смеси.
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http://www.angelfire.com/fm/compass/A6M_dev.htm

Development continued with the conversion of the A6M5 airframe to A6M6 standard by the installation of the Nakajima Sakae 31 engine with water-methanol injection, making possible a maximum speed of 345 mph (555 km/hour). Production A6M6 Zeros also introduced self-sealing fuel tanks. Operational units carried out field conversions on many to take a 551-pound (225-kg) bomb on the drop-tank mounting, enabling them to be used as fighter-bombers.
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http://www.btinternet.com/~lee_mail/Zero.html

Engine(s): (M6c) Sakae 31 with same rated power but water/methanol boost to 1,210 hp for emergency
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http://www.fiddlersgreen.net/aircraf.../zero_info.htm

If the A6M had needed extra power beforehand, it doubly needed it now, but permission to fit a larger engine was not granted. After building 93 with the improvements demanded Mitsubishi did receive some Sakae 31 engines, with extra power gained by injecting water/methanol to prevent detonation at full throttle, but most of these engines were retained by the maker, Nakajima, which went into production with the resulting A6M6c at the end of 1944. This was the final model of Reisen to see action...
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http://www.j-aircraft.com/main/newkits/a6mdesc.htm

A6M6c Model 53c
Water-methanol boosted Sakae 31 engine
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http://users.belgacom.net/aircraft1/avion1/26.html

The A6M6c put into practice the improvements envisaged on the A6M5c but which had proved unworkable by lack of components. The self-sealing tank took place behind the pilot while the engine got a water-methanol injection system for short power boosts. Actually, the injection system never worked properly, leaving the A6M6c with the same overweight problem as its predecessor.
The prototype was built by Mitsubishi but the mass-production should have been assumed by Nakajima. Very few were completed.
Built by Mitsubishi Jukogyo Kabushiki Kaisha
Other designation(s): Zeke 53c, Type 0 Model 53C
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