Hobbsy

My Feedback: (102)

It wasn't the actual cam bearings, it was the center cam drive bearing, the one just behind the crankshaft. Yes sir, jewels they are.

1QwkSport2.5r

Okay... That makes sense, though it still surprises me. Nonetheless its good to hear she runs good now.

Someday I'll pick up one of the little .36 (or whatever the little Enya 4C is) and an R120. They have an appeal that the other 4-strokes just don't have. A VT-240 is a dream. Rumor has it they might do another small production run of them in the future...

steve111

I think the standard of their engines is proof enough that the people at Enya know what they're doing and aren't idiots. Do you really think that they'd design and produce something as good as an SS30 or 40XZ, only to sell it with a .10-sized muffler?!


Unfortunately you didn't notice that he isn't even talking about the same muffler. The SM251 is the 'special quiet muffler'. I've never used one, but if it's got cones or baffles in it, I'd happily believe that it would knock a bit off the performance (in any case, he was only down 7-800 compared with the OS muffler, not 2000+). Anyway, it's a completely different item and hardly relevant to this discussion.


None taken. Sure I can re-check them, but the result is just going to be the same. When I get a chance, I'll repeat the exercise and video it so you can see for yourself. I should've mentioned that as well as taching it, we timed the model with and without the muffler. There was little appreciable difference; I think 2000+ rpm would've been noticeable.

The only theory I can think of for your results is that if the engine wasn't properly run-in at the time, the smaller muffler might've caused excessive heat buildup and prevented the engine revving properly. That's just a wild stab though. Otherwise your numbers don't make a lot of sense to me. I will agree that they're great little engines, though.

amc72

My Feedback: (2)

Do you think anyone would be interested in a rebuild kit for a 90? The guy who was rebuilding my 120 had me buy the wrong one.

1QwkSport2.5r

The figure for the muffled run on the 9x6 at 12,570rpm was after 1 hour on the test stand for break-in +/- a few minutes. The engine was briefly peaked and richened back up. The later run open faced was after a couple gallons of fuel were through it total. Break-in was 2-3 quarts. 1 hour is not totally broke in, and I realize that it may turn faster now, but that muffler is tiny and I think it may turn 13,000 now.... It is not going to run within 200-300rpm muffled vs. unmuffled. I can tell you that for sure. Are the folks at Enya idiots? No, and I never said they were. I will, when I have time, re-test the engine on the small stock muffler and open faced on a 9x6 APC prop and I will take a video of it just for you.

GallopingGhostler

I'm curious, 1QwkSport2.5r how your SS30 would perform with another muffler. Do you have another that would fit, have decent chamber size? Some time back, one had recommended that I use a larger muffler than the stock Enya .19 one for my Enya .19-VI TV. I currently have a Tatone Peacepipe muffler for .29-.45 that I am using with it. I don't have a tach, but with the larger chamber and exhaust exit it runs cool and doesn't seem to rob power.

1QwkSport2.5r

Read my Tach thread that I linked to a few posts back. I tested this engine with a TT Pro .46 stock muffler and a Jettstream muffler for a .46. I had stellar results with both, gaining some 1600+rpm.

You need a tach in order to compare one situation to another. Any rpm figure over the open exhaust figure is considered "tuned".

I hope to have a couple videos up later of my SS running on the stock muffler vs. open exhaust.

GallopingGhostler

1QwkSport2.5r , yes now that I think of it, I believe it was you that made such a recommendation. Without a tach, yes there is some subjectivity, a qualitative rather than a quantitative observation is that with a less restrictive muffler, my Enya .19 runs cooler and puts out a healthy amount of thrust.

Thusly, as you observed by using larger chambered mufflers indicates the true solution versus "status quo". I think the gain in using a larger chambered muffler makes it worthwhile to go with a larger muffler. I followed your advice on the Testor Series 21 McCoy .40 Black Head, using a large chambered YS muffler. It runs cool also.

1QwkSport2.5r

2-strokes thrive on larger exhaust systems. Volume is certainly partly responsible for the power gains, but I think the length to be most important. Longer pipe length translates to the pressure wave having to travel farther, which then translates to better exhaust scavenging. The return wave then pushes the fresh intake charge back into the exhaust port. The downside to using larger mufflers is adding extra weight to the plane, but if the power gains are significant enough, the added thrust will pull the model that much better. Of course adding extra tail weight isn't something you want to have to do, but there's no free lunch.

I remember the late Pé Reviers saying something about mousse can pipes. Something to the tune of having the can/header to have a volume 20 times displacement for the most benefit. I haven't put this idea to the test yet, but I plan to soon. Videos will follow of course.

martin_solo

I find the stock muffler that comes with the Enya SS30 Excellent. It is light and robs very little power from my engine.


Martin

1QwkSport2.5r

Are you guys running the ringed BB versions? Mine is iron/steel.

My ss30 has 4-5 gallons through it by now, this is the best I could do on a 85 degree F day, a 70 degree dew point.
9x6 APC, 5% nitro 25% castor, McCoy MC59 glow plug.

Enya muffler, peaked needle:

no muffler, peaked needle:


Maybe the engine has more running in to do. The engine gets a huge power boost by using a bigger muffler. When I get around to it, I'll retest the big mufflers on the engine since its pretty well broke in now.

GallopingGhostler

Thanks for the results, 1QwkSport2.5r. The truth is what it is. Opinions abound, there could be other variables that affect that others obtain differing results, as valid as they may be. As for me, I'm doing what pleases me, and enjoy the engines I have with the solutions I have come up with, which includes larger chamber mufflers.

Hobbsy

My Feedback: (102)

I did some digging and it appears that Enya uses the same muffler housing for the .30, .35, .25, and .25 Diesel. If that happens to be a muffler for the .25 Diesel, the insert in the end of the muffler would too restrictive. I may be completely off base but the Diesels usually have a restriction in the end.

1QwkSport2.5r

No restriction in the muffler stinger. The rear section of the muffler unscrews so I would assume the various engine varieties the muffler fits may use a different rear section.

My engine tests from the beginning of my tach thread were taken at 32-52*F air temp and dew points in the 40's so it is quite natural to lose power when the air is warmer and significantly more humid. The ringed versions' piston and rod assembly is almost a 1/4oz lighter than the iron piston so that alone could contribute to a few hundred more rpm simply because the rotating mass is less.

Regardless, my SS30 is one of my favorite engines as it is absolutely dead reliable and throttles better than anything else I have. A true sweetheart, and a bargain for me at $45 shipped NIB from a guy in NY. Also, in correction to one of my previous posts, I spent 2 hours on the test stand breaking this engine in. The piston fit was still a little snug even at that point, only after running a few more gallons of fuel did it really loosen up and start turning up more. So.. I was quick to judge the muffler vs. no muffler rpm readings. Either way you slice it, climate has a huge effect on how an engine performs.

1QwkSport2.5r

Alright Enya officianados, I'm eyeing an R120-4C.... It's used but appears to be in good shape. For those who have one, how do you like it as compared to other 4-strokes of that size? I love my 60-4C, I'd love to have the big 120... Typical prop sizes for it...?

1QwkSport2.5r

So I found another R120-4C Enya that is basically new, barely run. Not quite sure what I'll put it on just yet... I'm excited to have another Enya 4-stroke... Very beautiful engine!

tiffitech

..I'm not sure if that Enya on the pic is an R120, since it has the milled out "90" on the crankcase, It seems to be the first 120-4c that
used the same crankcase and was basically a bored out 90-4c.
On The R120-4C the "120" is casted in. The R120 has a bigger housing at all. Just look for the dimensions in your R120 Manual.


(I do own all three of the engines)

Kind Regards,

Holm

Warjet

My Feedback: (327)

I'm the person who has this engine and offered to sell to 1QwkSport2.5r

tiffitech

Mr. Warjet I think 1QwkSport2.5r should simply dismount the head from the engine, If he finds 2 different sized Valves, it is an R120, if not, it is the first rev 120 w/o the R.


..what the heck is an ounce? So far as I know is an ounce different every time you want the wight of an other thing.
An ounce of oil 1 ounce of Enya or Gold, so please provide a real unit.


from left to the right: 46-4c, 60-4c,90-4c,120-4c,R120-4c (in need of a rebuild)


Enya 120 in the 90-4c Crankcase


R120-4c with new designed Crankcase


old 120 from behind


R120 from behind.

Regards,
tiffitech

1QwkSport2.5r

The box says R120-4C as seen in the original pic I posted (of which came from Warjet's ad). Here are two other of his pictures that show the carburetor bolting onto the cambox. The standard 120 has the carburetor bolting to the side of the cambox like the 60-4C does. That and I thought the R120 had the black rocker cover and the older 120 has the plain cast aluminum cover ?

tiffitech

Maybe you have a bushed down 1.55 Version so they needed to mill the "155" of the crankcase to grave in the 120.
The mounting of the carburator can be differ, enya shipped some engines with different carburators, but the Housing
of the cam gear is looking like a R120-4C. (just look to my 2 pictures at bottom of the post).
What the box and the paper says ... yes, they could say everything, couldn't they?
Do you want to run the box?

The rocker cover was for three months in a glas with acetone to get the black paint off, it had scratches.
I wrote that the engine is in need of a rebuild, therefore some screws, the prop driver and the carburator is
missing at my pictures.

I don't thought that no one here can read my poor english "I'm not sure.."

Kind Regards,

Holm

1QwkSport2.5r

In our litigious society, misrepresenting an item (example: box saying one thing and item being another) can lead to among other things, the seller looking like a jerk. The seller in this case is a long time member of the forum and I doubt he would want to look like a jerk selling an item that isn't what it really is. If it were being sold through the big auction site, I'd be a bit more careful.

All of my aircraft engines that I own I purchased from RCU members with a long membership, reasonable post counts, and good feedback. Without that I'd likely not buy from them. I wish the feedback from previous sales on the old RCU carried over to the new RCU. I know some people may not want to deal with me because of my now lack of feedback.

Warjet

My Feedback: (327)

The weight in ounces was for

Hobbsy

My Feedback: (102)

You should be able to see your Ratings by clicking Buy and Sell at the top of this page and then click, My Market Home. When you run and ad in the MarketPlace your ratings are on the right side of the ad.

1QwkSport2.5r

Yeah, there's a few there but many are missing. Oh well.