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Tuesday, September 20, 2011

ENYA 46 4C







ENYA 46 4 C :- This is a second generation 4 stroke engine produced in Japan by ENYA Metal Products in early 80's to mid 80's. 


The Design:- 

Enya  40 Size - 4 Stroke R/C Engine

The basic design was so good Enya also produced it as a  diesel engine. They converted the slightly smaller version the 41 – 4 C engine into a 6.7 cc four stroke diesel. Outwardly the engine appears to be a diesl’ized’ version on the 41 Glow Four |Stroke, the engine in reality differs much internally.


The diesel version has a cast iron piston and a steel liner, which is more traditional for a diesel engine arrangement. The 41-4 C Glow features a ringed aluminium piston.


The diesel conrod is made to take the strain, it is double bushed and forged – much stronger and much heavier than the glow version. The crank shaft is heavier to. A diesel relies on compression to work and so the stresses on an engine are far great than a glow.
Specifications of the ENYA 46:-
Type - 4 Stroke Nitro Glow Ignition;


- Single cylinder;
- Displacement: 0.46 cubic inches (7.49 cc);
- Bore: 0.878 
In. (22.3 mm);
- Stroke 0.756 In. (19.2 mm);
- Shaft: 1/4X28;
- Weight (with muffler): 13.93 
oz (395 g);
- Max RPM 14,000;
- Propeller size 10 X6 to 13 X 5;
- Power .75 hp at 12,500 (55 W)


Design Features:- 
 2 Bearing crankshaft;
Rear mounted valve train (front glow plug);
Removable front bearing housing;
Ringed aluminium piston with steel cylinder liner;
Single needle carburator with built in choke


Personal Observations:-
I acquired my 46 used with a Goldberg J-3 Cub on floats. This engine adequatly powered the Cub for a time but take-off runs became longer over time until eventually, there just wasn't enough power to become air borne. Tear down revealed serious rusting of the main bearings so serious that bearing replacement alone would not be enough to affect a permanent repair so, the complete front housing assembly was replaced.
The serious corrosion probably resulted from my lack of experience with four stroke engines. The engine was stored with out getting rid of all of the water ingested due to float flying. I should have used some sort of after run procedure, such as running the engine dry of fuel and applying after run oil to the internal engine components before putting it into winter storage.
A word of warning, never use a clip-on type glow driver while operating this type of engine because of the of the close proximity of glow plug to the propeller arc, instead use a remote glow driver set-up.      

View a short video clip featuring the ENYA 46 running after a major overhaul and long term storage:-





ENYA 41-4C diesel engine R/C 6.64 cc


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