Quote:
Originally Posted by jray3
With all the idiots 'rollin coal' around my neck of the woods in their absurd trucks, I'd like to reciprocate with an enhancement to my sensible, stock-height grandpa truck ('87 F250 IDI 6.9 Liter). 
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Initial idea is to weld in a bung to the steel downpipe after the exhaust manifold, keeping the manifold nice n hot and avoiding any thermal shock to the cast iron, using a water/methanol injection nozzle and pump on a momentary switch.
Having a valve and controller to use water injection for economy or occasional steamrollin would be even more fun. |
I think you're on to something here. I've read in other gas engines where exhaust water injection is used to create a reflective wave which dynamically "tunes" the exhaust system (via exhaust gas scavenging) to improve torque and horsepower at rpm bands other than what the original system was designed for. May be kind of a nice thing when you're pulling a stock trailer vs. putzing about town.
I don't see that a large amount of water would be needed, just enough to reflect the exhaust pulse. And I doubt enough energy would be absorbed to change the temperature of the iron manifold in any significant way.
Further, on a turbo set up it may be a nice way to keep the turbine de-coked.