|
Rudeboy -> RE: RE: RE: mvvs 1.60 gasser (2/28/2004 1:54:54 PM)
|
Ok, I received my engine this week, and tried it today... here are the results:
I bought mine second hand off ebay. I don't know why the guy sold it, but it came with all the accesories you need (fuel tank, pump, fuel line, filters, 16x12 prop...). I opend it up, and I think this engine hasn't been run for more than a tank of fuel or so... it is nearly new.
The engine has a graphite coated piston, a 9.5mm carb and a Vlach EZM 1 TI ignition with twin magnet pickup, so I guess it is the latest version.
Fuel used in the test was 98RON unleaded fuel mixed with Mobil 1 synthetic two stroke racing oil in a proportion of 25:1.
Prop was a 17x8 APC.
Ignition battery was a 800 mAh 4-cell NiCd.
At first I got frustrated... I could not get this thing to fire... It did absolutely nothing!
So after a while I took out the plug to check the ignition. The ignition was fine but the plug was wet... Me being a stricktly glow kinda guy I apparently flooded it big time.
It was freezing outside so I broke out the hot air gun and heated the engine up to clear out the excess fuel faster.
With the engine heated up I could get it to fire a couple of times, but that was it... just a few burps...
I had been flipping that prop for about an hour and my shoulder started to get sore...
I figured something must have been wrong, so I took off the carb and opened it up. Everything looked pretty much OK... but then I noticed the little tab on the regulator membrane wasn't touching the needle lever (or whatever you call those things)... Now I don't know a lot about this stuff, but to me that didn't look right... The needle should be lifted off its seat and close further again when fuel is pushing against the membrane... right?
I adjusted the"needle lever" so it was level with the carb body, and bolted everything together again.
Second try:
Same thing basically... but there were slight signs of life this time, so I don't give up just yet. I still felt it had way too much fuel in the case, but I'm new to this stuff so I'm not really sure about anything.
After flipping the prop for about 30 more minutes I decided it was time to get drastic with this thing! I closed both needles completely so no more fuel could get into the engine. I flipped the prop until it finally burst into life, albeit shortly... woooohoooo :D
So now the case was cleared of all excess fuel it was time to dial the needles in.
I slowly opened them both up until the engine finally kept on running. Apparently my modification of the lever height resulted in too much fuel pressure, because I have to close the low speed needle pretty far, and keep the high speed needle futher open (in comparison to Pé Reivers recommendation of opening both needles 1.5 turns for starters)
After tinkering with the needles for about 15 minutes, all I can say is that this thing starts, idles and runs like a charm! All that elbow grease payed off somehow... perhaps I broke the engine in by hand or something like that ;)
I have 500 ml (15 or 16 oz) of fuel through the engine now and I can get it to idle for long periods (10 minutes plus) at 1750-1800 rpm... it is pretty cold outside and the engine is still set rich so it sputters a little when I open the throttle after it's been idling for so long, but it doesn't quit.
At full throttle it stays just shy of 8000 rpm with the APC 17x8. I hope this will get better when the engine gets broken in and I lower the oil content a little. For now I consider these readings satisfactory.
I really get the impression this engine will turn into a fine running piece of machinery over time. And I can't wait to get a pipe bolted to this thing.
About the pics: somehow my camera doesn't seem to like fast moving objects (like props)... the engine was idling steadily at 1800 when I shot the pics.
|
|
|
|
