Clancy Arnold

Ihave a friend Joey Mathison that flies CLSpeed. He holds the model with one hand while doing over 200 MPH. You want to see Mass in Motion! Joey weighs about 320 Lbs and the model Class B, D or Jet are doing 1.4 second laps. I asked Joey several years ago how he gets in shape to hold the Speed Models and he said he does one arm curls at 95 LBS.
Clancy

Rudolph Hart

Hey welcome clancy,when i read your first post and saw the size of the model and it being control line well,i thought you must be pretty brave thanks for the interesting explanation.

Rudolph Hart

Hi dave do you think this subject needs a bit of clarification for the not so expert members of the forum such as me "this veeger requires the information"

There seems to be much confusion here and elsewhere,your comments on the little 30 bulging a sullivan tank lead me to believe that you ran a pressure line back to the fuel tank which i did'nt think was necessary if you use the cline.If i've just got that back to front it still makes a point..this subject could do with an airing do you think? perhaps a couple of diagrams too as there are people who don't like to run pressure lines back into good fuel.

rcdude7

My Feedback: (264)

The cline reg works much like a YS fuel system, however on a fourcycle it uses muffler pressure instead of crankcase press. Yes, it does send exhaust gasses to the fuel tank.

Clancy Arnold

Basically you have 4 choices to get fuel to the engine:
a. Venturi Vacuum
b. Exhaust pressure
c. Crank case pressure
d. Pump

Clancy

Hobbsy

My Feedback: (102)

http://www.billsroom.com/pcfs/fuelsystemdesc.html

The Cline regulator is the equivalent of the regulator side of a Walbro carburetor, the thing I like most is that your engine will run the same from full tank to empty and it doesn't matter where you put the tank. The check valve goes in the pressure line right at the pressure tap on the muffler.

NM2K

My Feedback: (14)

How does one go about buying new Cline Regulators these days, Hobbsy? TIA


Ed Cregger

KenD

My Feedback: (65)

Ed look at the previous post!

Nikolas K

So, Cline regulator is in reality a fuel injection system...???

NM2K

My Feedback: (14)

.

w8ye

My Feedback: (16)

No!

It is just a demand regulator.

It keeps fuel available to the carb at a constant pressure.

This fuel is supplied (on demand) by the vacuum signal supplied to it by the carb venturi.

On the tank side of the Cline regulator, fuel is presented under pressure typically by running bleed pressure from the engine through a check valve.

triumphman49

My Feedback: (149)

Hi all,

Believe I read where someone was using a perry pump and cline regulator with a Saito gas conversion and stock carburetor. Does anyone know if the Cline or IronBay regulators are compatible with gas?

Thanx much
T-man49
Club Saito #723

w8ye

My Feedback: (16)

I don't know about the Iron Bay but the diaphragm in the Cline is a standard Walbro D10-WAT

triumphman49

My Feedback: (149)

Hey THANX ,

T-man49

Nikolas K

So, the fuel metering is not provided immediately by suction, but by the regulator. Suction only helps to adjust the amount of fuel needed and the fuel is provided under positive pressure. Then, its principle is like the pressure carburetor invented by Bendix ( http://en.wikipedia.org/wiki/Pressure_carburetor) for the large piston aero engines. I copy a sentence from the article here:"The fact that a pressure carburetor operates on the principle of fuel under positive pressure makes it a form of fuel injection." In fact, even using only exhaust pressure to pressurise the tank, makes our model glow engines carbs act like pressure carburettors.

Hobbsy

My Feedback: (102)

The carb in this case sees no pressure, the pressure is between the regulator valve and the tank. The carb still operates in response to low pressure pulses caused by the venturi action. The regulator responds to the same low pressure pulses, the demand.

Nikolas K

Ok, now I understood it! Thank you Hobbsy!

gkamysz

My Feedback: (19)

Cline, or Iron bay, or OS carb regulators supply fuel to the carb at slightly below atmospheric pressure. Study the design. I was also under the impression that YS four stroke fuel injection systems are simply demand regulators. This is NOT the case. Carefully study the design. YS uses mechanical fuel injection systems. Rather simple, but effective for glow fuel.

w8ye

My Feedback: (16)

Some people bias the regulator atmospheric pressure reference with exhaust pressure which gives a positive pressure related to engine speed and power output. Pe Reivers did some of this.

He made his own pump/regulators by converting old Walbro carbs.

http://prme.nl/home/regulated_fuelsu...el_supply.html

Rudolph Hart

Thanks for the link i'm reading it now,cheers

hsukaria

Ok, so there are good options regarding pumps and regulators. But when do you need them? What symptoms or problems with the engine operation cause someone to need more than just exhaust pressure to the tank?

w8ye

My Feedback: (16)

I think the discussion came up as a result of someone wanting to run gas in a glow Saito carb?

I have not biased a regulator with muffler pressure. I've always found regulation to be adequate when just using atmospheric static pressure.

Gasoline runs twice the air/fuel ratio as glow fuel. Therefore the flow of gasoline is more sensitive because you are using less of it. Therefore the need for a constant pressure.

A pump and regulator would be indicated on a glow engine when you are running a tank not directly behind and centered on the needle valve or when you are not running muffler pressure to the tank.

NM2K

My Feedback: (14)

To me, the only true fuel injection is direct injection. Yes, what some folks call fuel injection is not carburetion, but it isn't true fuel injection either. We need another name. Any suggestions?


Ed Cregger

w8ye

My Feedback: (16)

I remember some years ago about references to a "Pressure Carb"

spaceworm

In the auto sector, fuel injected into the manifold by a single injector was/is called manifold injection. Fuel injection by multiple timed injectors just outside of the intake valve was/is called port injection. Fuel injected by separate injectors directly into the combustion chamber is called direct injection. I think VW calls the latter TDI, and is what Diesel engines employ.

At least that has been my understanding. Comments anyone?