|
Edhamp -> RE: Evolution 7 cylinder 260cc radial engine - Operation and maintenance (7/5/2012 9:11 PM)
|
EVO 160 ENGINE TEST & SOUND:
This thread has gone a bit quiet, so here is a short vid of my EVO 160 on its test stand, for the CARF Corsair as previous post.
http://youtu.be/aFrovdQmYW4
From my experience so far, the EVO160 is a very impressive engine, despite a couple of minor niggles already gone into on my Corsair thread. This engine starts really easily from cold after choking and hot, hand flipping only required, the manual choke worked fine . I deliberately set the tank lower than the carb by approx 6 inches with a longer than will be used fuel feed pipe (large diameter tygon, not the narrow stuff) to see if there would be any problems in drawing fuel into the carb without a fuel pump. There was none and, the inaccessible primer bulb fitted to the walbro was not required.
I do not think you will need an auxiliary fuel pump with this engine. The conventional pulsed fuel diaphragm set up works well. The engine seems to sip fuel, a 32oz tank is more than enough.
Throttle response was fantastic straight out the box (the engine seems to have been properly set up at the factory).
Full throttle (only a few brief seconds at this stage of running in!!) FRIGHTENING, enought to lift the two sandbags and a large bag of heavy compost weighing down the test stand. The 260 must be awesome! This motor will have plenty of power for 50lb scale model. I ran it with a 26x12N 3 blade Menzlik. Without any tuning at this stage and using running in oil mix, 5500rpm was seen and will idle fine as slow as 1000. The exhaust ring is pretty effective and quiet at lower trottle settings and with this prop No problems with any miss-firing cylinders or cold spots at any time and glad to say nothing came loose like exhaust mounting nuts.
The engine sound to me is more V12 than big block V8, in this respect, I think a large 5 cylinder MOKI260 has the edge with a more throaty deeper scale sound, whereas the EVO 160 sounds better than the Moki150 which, in my view, can sometimes sound a bit tame in an enclosed cowl. On the other hand there is a fair bit of mechanical "clatter" with the Evo160 which may reduce with the cowl on and only noticeable close up to the engine. The sound gets better further away as the lower frequencies come through.
Overall the easy starting, good pick -up, slow idle, smooth vibration free running, and sheer power are all good so far. Very impressed. I already have another dream project lined up for this engine - it fits perfectly in the cowl of a 1/4 scale Curtiss Goshawk from some old Dick Barron plans that I have .......................................................
|
|
|
|
