I have an O.S 1.60 FX that i have just installed a vp 30 perry pump.I always after a day of flying run the engine dry of fuel and add afterun.The instruction say not to run the pump dry.What do you do with this application.

Don't ever run an engine dry. Would you drain the oil out of your car and run it dry? Thats what you are doing. There are many schools of thought on this, but I have 35 years of exp not running them dry and still have some of my first engines. The friends who run them dry and use after run, replace engines because they fail. Its not the best thing to do, but thats just my opinion.

The oil in the fuel keeps it lubricated and the nitro evaporates very fast. If you are going to store it for long periods or you live in certain high moisture spots, then lube it good after you fly it.

Many will argue, but nothing can change the facts here.

I have 55 years of experience and I like to run them dry. What does that mean you ask, It just means I have been modeling for a lot of years and my opinion is no better then anyone else, that's all. I have no idea why Perry doesn't want you to run them dry. Perhaps if you wrote or phoned them they could tell you why. I have opened one up to see what is inside and there is nothing in there except a small round piston that vibrates from side to side.
As for a car, when I put a car in long term storage I do run them dry, oil down each cylinder and drain the oil pan and gas tank. Before I fire them up again I relube everything, roll the engine over and fire it up. I just fired up my pick up truck I had in storage for 6 years, wow, no rust and it fired right up. A bit of smoke when it fired but it's still running.

Interesting. I have never run one dry nor used after run and doing it for 60 years SO I WIN HAAA. Always more than one side to every story.

I bow to your age and wisdom. Just a question, do you have a rust problem living in bug country?? Most people I know living in a humid area tend to have bearings rust up on them pretty fast if they don't dry run there engines. Living in the land of no flying insects we don't get much in the way of rust weather or not we run the engine dry, here I only do it when I'm in the mood. Of course here we sacrifice a goat every time it rains!! We think the dry gods are pissed at us!!!

Gray Beard:Originally I'm from N.J. also along the coast but have not had problems with the exception of one bearing problem. Can't really explain it but am pleased. Overall my experiences with RC have generally been great. Of course in the early single channel days that we will just discount Ha.Strangely I find it interesting to follow these posts and often learn something as well. Am annoyed though at times when I see same questions asked over and over. Why don't these people do some reading? Oh well. Guess being an old fart gives me the right to *****??

Yep, you beat me. I only have 58 years running glow engines. I have always run the engine dry and for the last 30 years used ARO. I have never lost an engine to rust or corrosion. My very first engine (OK Cub .049) still runs and my first ball bearing engine (Fox .60 Eagle I) still has the original bearings after 38 years. But then I have not run it much in the last 30 years.

Bruce

Ted, you mean taking the time to do a search first or reading a sticky like the prop chart? You jest!! That would take some time and effort. I asked about the rust because I had a friend here in Vegas that had to move to Texas to a very humid area. He sent me a couple of almost new four strokes he was having problems with. When I opened them they were balls of rust in just one year. The man was really careful with his engines so I was a bit in shock at how fast the rust happened. Even after run oil didn't save these engines.
I still have my big engines from my control line and free flight days, McCoy and Veco 19s. Throbbing power!! I still use my TD .049s once in a while. These of course always get run dry unless they get landed early.

Ok Fs one, first be assured I am not going to bore you with my years of experiance that just smacks to much of small sandbox dominance games and I will not go there. I will answer your question as to "what to do"

You are correct the Perry, Varsane, Conley instructions for the VP-30 regulating pump and the VP-20 ossilating pump both state that if the engine is to be stored for a period (without a suggestion as to how long) that a short jumper should be placed on the outlet and on the inlet sides of both pumps with fuel still in the pump.

Now if you want to run out fuel in the engine (remember thats up to you and I am not taking sides here as thats another thread) The procedure and exact answer to your question is to: with the engine running disconnect the fuel line at the engine and loop this back around unplugging the tank to pump line and plugging the carb line into the inlet side. The engine will run out, there will be fuel still in the pump and cannot escape and its only neccessary to defuel the tank from the tank line which is now disconnected. Thats it.

John

Thanks john for answering the question i have asked in full.It would be niceif people would read the question in its entirety and give an answer to the question instead of rambling on .

The diaphragms in the Perry pumps dry out. They need to vibrate at whatever designed frequency and amplitude to work properly. I bought an older Perry pump which didn't work; I called them up and was told 'there's no way that pump can still be good' due to the age of the diaphragm and subsequent degradation. So it is a good idea to keep them moist and not run them dry.

I found it easier to switch to stainless bearings and forget about maintenance, whether it works or not.

I guess what ever works is what we do. As I said just been very lucky I guess. In my case have to admit too lazy to do it any other way.

"Don't ever run an engine dry. Would you drain the oil out of your car and run it dry? "

I would not drain the oil out of my car, but when I store my Spitfire, I drain all of the fuel out of it and run it until there is no more fuel in the carburetors.

Les