Hi guys, I have a cmp f6f with a os 120 mounted inverted and the engine stalls.I have and onboard glow system installed witch works great at idle.I was told to install a perry pump and that would take care of the stalls.I dont know anything about perry pumps!!!Can anybody help me understand them and how to install them????
thanks Fred

The VP30 is the one you need

http://www.perrypumps.com/prod02.htm

instruction sheet http://www.perrypumps.com/Pump%20and...s%20System.pdf
http://www.perrypumps.com/VP-30%20and%20VP-40.pdf

That sounds to me like a bandaid fix to a more serious problem. The engine should be able to run inverted without the help of a pump. Is it the 120FS or 120AX?

What's your tank height relative to the needle valve?

They work great. Have one fitted to my Saito 1.80...flown >32 hours without a dead-stick.

hey: my fuel tank is higher then my engine,and I think that is what is stalling my engine.
Fred

witch one are you using on that saito 1.80.my engine is a 1.20 4 stroke surpass
thanks Fred

A Cline demand regulator will keep the fuel always the same at the carb

Had to go out and take a peep, in order to find out which Perry is on my Saito 1.80. Still don't know, 'cos the label has worn off, but I can tell you that it is the type which uses crankcase pressure as its motive power.

I have the engine mounted in a 1/4 scale Stampe. The fuel tank is way back in the fus, over the CG...that's about 12"-15" from the carby. HTH. For most of its life, this model has had a petrol engine. In fact, it flew >200 hours whilst fitted with a Zenoah 23. Believe it, or not, the Saito (with pump and on-board glow) is far more reliable, much more powerful and a heap more expensive to feed!

Perry regulators will not stop flow from the tank to the carb due to gravity feed. I think the Cline regulators will. I use Perry Pumps so that I can move my tank to the plane's CG, but still try to keep the center of the tank even with the carb. They do that job very, very well.

Gee Joe, you woun't have to bother with that little problem with your new plane and engine!![8D]

I had to work REALLY hard to talk myself out of buying a YS 63 for my little Venus. I'm sure you can imagine how close I was to that and a regulated lipo Rx battery!

I have a Perry pump on a seaplane. The engine is mounted on a pod above main body of the plane and tank is located at least 6" beloew engine in main body. The pump works great at getting fuel to the engine.

This is a good application of the Perry pump

hey guys, sounds like I need a cline,not a perry pump,
where can I get one of these.
thanks Fred

Get the Cline regulator here [link=http://www.billsroom.com/pcfs/index.htm]Cline Regulator[/link]
http://www.billsroom.com/pcfs/produc...fs_install.htm

thanks for the help and info.I think I will go with the cline reg.
thanks Fred

cline regulator works perfectly on my inverted 120 4 stroke, so it should work for you.

Hi Guys Can I use a perry pump carb without a using a pump when the tank is right behind the engine???

It should work if the carb is not bad.

At least try it.

This appears to be another case of layering on uneccessary complexity in the search for reliability resulting in even more problems, cost and complexity.

That engine will run all day upside down with no problems at all 'If' you maintain the proper tank height to spraybar relationship which is carefully spelled out in the OS 120 manual.

I just bought a new one to install in this GP Stearman arf that someone wreaked on its maiden and I rebuilt for myself. Been flying it for about two weeks now(almost every Day) and there are Zero issues with fuel delivery with the tank properly installed and I can and do fly it around upside down a lot even low just because everyone gives me a hard time about flying an old Fordson tractor upside down. They claim it sounds like one too

Properly install the tank and you do not need any pump, regulator and likely even on board glow. I certainly don,t use one of those either.

I have not assembled or flown the CMP Hellcat but have looked one over carefully for someone and there is no reason in that airplane not to put the fuel tank where it should be. The front end is caniverous. CMP cannot be counted on to suggest any fuel tank location at least none that are practical locations In that respect their batting record is even worse than their CG suggestions

Lower your fuel tank down to the recommended height relationship to the needle valve in your manual and it will be as reliable as an old Fordson tractor too and you won,t even need that glow thing.

John

Update on the Cline Regulator. It appears the business is for sale due to the fact that Jim Cline passed away on November 9th. Check the company link for more information.

http://www.billsroom.com/pcfs/forsale.htm

The company was for sale before Mr. Cline's departure.