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

[Jim_PA]

Originally Posted by Billla

I've always stayed away from the engine flush concept but then again I use synthetic in everything and change oil every 3K.

Dang, i bet the oil companies love people like you. And back to the water subject, what's the big deal? Haven't you ever heard of water injection systems?

[nevada70chev]

thanks john, how is kentucky? sure will missing having you close.

[Billla]

Originally Posted by Jim_PA

Dang, i bet the oil companies love people like you. And back to the water subject, what's the big deal? Haven't you ever heard of water injection systems?

Well, sitting on a 186K mile 1995 LT1 and a few other high-milage engines, I guess I'm not too worried. I see it as pretty cheap insurance.

Yes, I have heard of water injection - we use it in racing engines at Reno in the Sport Class. It cuts the life of the engine by over 50% and the bores look like hell when we tear them down. The Merlin aircraft engine (P-51D) had water injection, and if it was used to exhaustion (about 8 minutes I think, but I'd have to look) the service manual called for immediate replacement.

Hey, it's a difference of opinion I'm not going to change my mind based on my experience, and you're not going to change yours based on your experience. It's all good

[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.

[junkyardjohn]

Originally Posted by nevada70chev

thanks john, how is kentucky? sure will missing having you close.

HI JON.. THERES PEOPLE & THINGS I MISS ABOUT NEVADA (DESERT SHEETMETAL COMES TO MIND). BUT I LOVE IT HERE. I SHOULDA MOVE HERE 30 YEARS AGO. IF YOU EVER NEED ANYTHING , JIMs GOT MY #. JUST CALL & I'LL CALL YOU BACK.(I HAVE FREE LONG DISTANCE) JOHN

[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