ping under load

[junkyardjohn]

Jon.. You Can Tell When You Put Down Too Much Water To Fast When You Can't Keep Your Motor Running. I've Always Seen A Tea Spoon Used Instead Of Trying To Pour It From A Bottle. John

[jhow66]

Why would you use it in a racing engine? Racing engines are supposed to be built for racing only so they are tuned to do just one thing. Do they have to run under some special rules in that class?

[Billla]

Originally Posted by jhow66

Why would you use it in a racing engine? Racing engines are supposed to be built for racing only so they are tuned to do just one thing. Do they have to run under some special rules in that class?

Let's make sure we differentiate between this "steam cleaning" thread and water injection to start There's no real relationship between them - the steam cleaning thread is about removing carbon "hot spots" that cause pre-ignition, water injection is a tool for getting the most out of a high-performance engine. I'm not suggesting any relationship at all between the two, other than my concern that pouring water down the carb isn't a good idea in my opinion

Water injection is used on racing engines that are on the ragged edge of detonation by design. On an air-cooled aircraft racing engine, manifold pressure of 25-35 inches is normal (test flights, cross countries, etc.) but during the race will run at 60+.The first time I saw 60" on an MP gauge, I thought I was dead - seeing this on a stock light aircraft engine means parts will soon be departing the aircraft

Same thing on the old warbird engines with water/alchohol injection - about 45" of MP, going to 60 or 70 (or I hear in some cases, 90"+) when the water injection is used. There's a safety wire on the throttle that you push through and break to get into "WEP" - War Emergency Power. Some video games even replicate this - if you use "WEP" for too long the oil temp goes up and the engine fails.

[jhow66]

Originally Posted by Billla

Let's make sure we differentiate between this "steam cleaning" thread and water injection to start There's no real relationship between them - the steam cleaning thread is about removing carbon "hot spots" that cause pre-ignition, water injection is a tool for getting the most out of a high-performance engine. I'm not suggesting any relationship at all between the two, other than my concern that pouring water down the carb isn't a good idea in my opinion

Water injection is used on racing engines that are on the ragged edge of detonation by design. On an air-cooled aircraft racing engine, manifold pressure of 25-35 inches is normal (test flights, cross countries, etc.) but during the race will run at 60+.The first time I saw 60" on an MP gauge, I thought I was dead - seeing this on a stock light aircraft engine means parts will soon be departing the aircraft

Same thing on the old warbird engines with water/alchohol injection - about 45" of MP, going to 60 or 70 (or I hear in some cases, 90"+) when the water injection is used. There's a safety wire on the throttle that you push through and break to get into "WEP" - War Emergency Power. Some video games even replicate this - if you use "WEP" for too long the oil temp goes up and the engine fails.

Ok I see where you are coming from now. Never flew or been in a plane before. At my age don't guess I will get to.

[Billla]

Originally Posted by jhow66

At my age don't guess I will get to.

Hey, never say never A guy I know belongs to the Unified Flying Octegenarians (UFOs)...a group of > 80 pilots that flies out once a month for breakfast somewhere