Intake too cold for WI?
 

Hi,
been running my RV8 with the supercharger for a bit now and the intake air temp has only ever reached 35C, (95F) and I've had no detonation as yet either. Im only running at 5psi boost at the moment and I havent switched the WI on yet. Are these temperatures too low to use WI? Im concered as to what happens if all that water doesnt get evaporated,
Phil

Don't worry about water
 

Don't worry about unevaporated water. It will cause no problem. Infact a good portion of the water will be in droplet form when it enters the chamber even with higher intake temperatures.

By way of example on combat aircraft development tests for the Pratt and Whitney R2800 engines used in WWII military aircraft, they used to conduct a test called the "flood" test. They would crank up the water injection so high, liquid water was litterally pouring out of the exhaust ports. It caused no damage to the engines, the only thing excess water will do is it makes the engine act a little "soggy" -- perfomance drops and max power goes down if you inject too much. It acts much like if the mixture is way too rich.

You won't have any problems with the water getting in the oil with modern oils and assuming you get the engine up to normal operating temperatures.

Keep in mind that for every gallon of gasoline the engine burns it creates 1.25 gallons of water in the exhaust.

Turn on the injection, if performance does not improve you don't need it yet, if it does you learned something useful.

Larry

Thanks for that,
Ill give it a try,
Phil