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582 W/ chopped muffler Very interesting

 
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Aerobatics(at)aol.com
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PostPosted: Mon Oct 16, 2006 5:33 pm    Post subject: 582 W/ chopped muffler Very interesting Reply with quote

I am so conservative .... if Rotax says "X" its "X" to me.

Personally, I have to believe they know a lot more about their engine than any of us, simply by virtue of the number of engines they sell and support compared to an individual or even a group.

Now, nothing is perfect, and engines have moving parts and it can fail. We all have heard of it happening. Lets try to manage these risks wisely

That being said, I was at a fly-in and saw a very nice Rans with a big chromed tuned pipe proudly sticking out the side the fuse. It was pretty awesome so I asked the owner about it. I forgot the details, but he was claiming really big horse power ( I think 80 or 90) and how he changed this and that and how fast it could climb and so on. It was Cool! I wanted one of those...

I asked, doesn't that stress the engine? Nah, he responded, it is designed for much more than that and in fact he just returned from 1,000 mile cross country problem free. I was impressed!!

There was one dead stick during that fly in. We can guess which one, in fact, I think it "grenaded". He had to trailer it home.

Maybe it might have failed anyway, but, I doubt it.

I go by the book, I know its boring......


Dave








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Malcolmbru(at)aol.com
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PostPosted: Mon Oct 16, 2006 6:20 pm    Post subject: 582 W/ chopped muffler Very interesting Reply with quote

Bravo Dave the muffler mod came from Kit fox and I would prefer to have it original my self on the up side producing less power provides moor reliability. And I still get 68mph out of 5400rpm. lower rpm equates to even longer duty cycle malcolm
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PostPosted: Mon Oct 16, 2006 6:35 pm    Post subject: 582 W/ chopped muffler Very interesting Reply with quote

In a message dated 10/16/2006 9:24:25 P.M. Central Daylight Time, Malcolmbru(at)aol.com writes:
Quote:
Bravo Dave the muffler mod came from Kit fox and I would prefer to have it original my self on the up side producing less power provides moor reliability. And I still get 68mph out of 5400rpm. lower rpm equates to even longer duty cycle malcolm


Gee you make me wonder what muffler I have??

I think its from KF ....... MY KF2 came with a 532� , I then replaced it with a 582 BH and E box, but used the original muffler.

I turn about 6,400 to 6,500 at full power 55 mpg climb. IVO 3 blade I cruise around 5,600 to 5,800 75 to 80. I do have lift strut fairings and even gas cap fairings. I think it helps...

Seems to be a good combo, however I have been looking at that new prop from Lockwood.

Dave Patrick

KF2
582 BH
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dave



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PostPosted: Tue Oct 17, 2006 4:35 am    Post subject: 582 W/ chopped muffler Very interesting Reply with quote

That just about sum up my feelings as well. Rotax is smarter than allot give them credit for and they do make good engines with good reliability. Unfortunately allot try to compare the 2 stroke parts to the similar snowmobile parts and claim robbery. Well I think for example that allot of 582 parts are exclusively made for the 582 and are made for continuous running like crank bearings. Also the pistons are not same either. Most of the bad mouthing that Rotax gets is from folks that are basically ignorant to how you are supposed to run them "properly"

I just raised my needles yesterday(lowered the clip) and re-pitched a bit finer and got in near 2 hours of flying yesterday and stubborn me pulled one plug from each cylinder to see them still looking good with a little carbon on them but I left them in for a bit longer, they have close to 60 hours on them and still running well.

We want reliability and by changing to a performance muffler will give you better performance but you will shorten the life of your engine.


Dave
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dave



Joined: 22 Sep 2006
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PostPosted: Tue Oct 17, 2006 4:38 am    Post subject: 582 W/ chopped muffler Very interesting Reply with quote

Mal, I would like to add that fuel flow at rpm is important as well. For example if you are too course of pitch and you run WOT 5500 rpm then your 5400 rpm at 68 mph now turns in to a gas guzzler that is straining it's self. I think my 582 at 5400 rpm is about 13 or 14 litres per hour. But if ou were too coarse a pitch that could be 25 litres per hour ansd really lugging hte engine.


Dave


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