Using Pressure on a Cox .051 R/C
#1
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Using Pressure on a Cox .051 R/C
I would like to use fuel pressure on my Cox .051 R/C engine but, I have a nipple for tapping it in on the backplate and there is the unopened nipple on the front of the plastic. Which method is the best? Thanks.
#6
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RE: Using Pressure on a Cox .051 R/C
It won't cost you anything to try it. The pressure is higher than what you might think and tiny model engine carbs don't have compensating fuel circuits that can handle a wide range of fuel demand and system pressures, like fullsize automotive carburetors have.
Crankcase pressure is to allow you to feed an oversized venturi with adequate pressure for wide open throttle flow that a smaller bore carburetor can not support and that the engine is unable to suck on it's own without providing some "push" also.
It's a pretty ingenious way to allow these tiny engines to process as much air as possible without going the next step up to a tuned pipe.
Crankcase pressure is to allow you to feed an oversized venturi with adequate pressure for wide open throttle flow that a smaller bore carburetor can not support and that the engine is unable to suck on it's own without providing some "push" also.
It's a pretty ingenious way to allow these tiny engines to process as much air as possible without going the next step up to a tuned pipe.
#7
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Thread Starter
RE: Using Pressure on a Cox .051 R/C
CBP......I am going to leave it alone as it already screams. I haven't done a lot of inverted flying where I thought it would need it but now will abandon the idea. Thanks!!
#8
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RE: Using Pressure on a Cox .051 R/C
If memory serves, the .051 R/C has a little muffler and a carburetor? If so the muffler pressure should help a bit.
On my exhaust throttled TeeDees I usually hook up the tank vent to a 3/16" brass tube mounted so that it's facing into the prop blast as close to the prop tips as possible. It fattens up the top end and after resetting the needle to compensate, the midrange transition's better. That's my story and ah'm stickin' to it.
On my exhaust throttled TeeDees I usually hook up the tank vent to a 3/16" brass tube mounted so that it's facing into the prop blast as close to the prop tips as possible. It fattens up the top end and after resetting the needle to compensate, the midrange transition's better. That's my story and ah'm stickin' to it.
#9
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RE: Using Pressure on a Cox .051 R/C
DB.....Good idea...I might even trumpet bell the end so as to catch a bit more air....I guess it might handle that don't you think? I guess I am worried for nothing as this engine literally screams. I just thought it might help while inverted or mounted upside down. I have never owned a tach but might pick one up to see if this engine is really going as fast as it sounds. Thanks
#10
RE: Using Pressure on a Cox .051 R/C
What .051 RC is this engine?.... I have TeeDee with a carburator and Medalilion with sliding exhaust and NVA linkage
No matter in either case (sounds like you want to MOUNT the engine inverted) the tank pickup must be level with venturi NVA
I prefer Texas Timers fine thread NVA and bladder on my non RC Medallion .051s
No matter in either case (sounds like you want to MOUNT the engine inverted) the tank pickup must be level with venturi NVA
I prefer Texas Timers fine thread NVA and bladder on my non RC Medallion .051s
#11
Join Date: Jul 2005
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RE: Using Pressure on a Cox .051 R/C
ORIGINAL: fredvon4
What .051 RC is this engine?.... I have TeeDee with a carburator and Medalilion with sliding exhaust and NVA linkage
What .051 RC is this engine?.... I have TeeDee with a carburator and Medalilion with sliding exhaust and NVA linkage
ChrisM
'ffkiwi'