Quote:
Originally Posted by t vago
The theoretical maximum efficiency for the Otto cycle (gasoline) engine depends solely on its compression ratio. Lower the temperature of the inlet air, and the efficiency is left unchanged.
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Yeah you nailed it.
This is how I would use water alcohol injection.
Build the engine to have a fairly high compression ratio, up to around 12.5:1 with a factory or mild preformance cam. The engine would run like any other engine out there, nothing special. Normally it wouldn't use any water/alcohol at all.
But when going up hills or any time power is required that would drop the maifold vacuum to between 5'' and 10'' of Hg, right about the time preignition or detonation starts to happen water methanol injection would kick on.
Control systems for the water alcohol would be adjustable aftermarket knock sensor, vacuum switch and RPM activated switch.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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