Rotax exhaust manufacture

[mulderpm]

Hi all, the inlet cone assembly of my 180 deg side mount 582 exhaust cracked on both sides. Apparently, this happens with age. The 90 deg inlet cone's do not do this. I am having it welded but want to replace it. The agents say that this component is no longer available separately and I must buy the whole exhaust, eina! Does anyone know who can manufacture this tapered, tuned, pipe? NB : this is not the small ball joint elbow.

Paul.

[Bundy]

Have you phoned a few AP's and asked if they have a 2nd hand one?
How much does the Taliban's Extortion Programme want for a new one?

Call Alex Rudd....tell him what you seek my son.....

[mulderpm]

Have you phoned a few AP's and asked if they have a 2nd hand one?
How much does the Taliban's Extortion Programme want for a new one?

Call Alex Rudd....tell him what you seek my son.....

Thanks Alan.

New one, hold on.......R 4015.

After some searching I found the following:

De Graaf Silencers make exhausts and silencers to order. mThey have made some for aircraft, even out of stainless steel if you want. They welded mine and showed me a stock replacement, which they will fit if the weld does not hold. I fitted the exhaust this morning and took AMH for a flight. No leak . I think that is why the Taliban does not stock the cone separately. No one will buy it if De Graaf has it in stock at a fraction of the cost. I did not ask them about a 90 deg bend cone, but I am sure they can make it.

So there you go....need an exhaust, who do you call...De Graaf.

Paul.

[nickjaxe]

Read a scary tale on another forum the other day of a guy who mig welded his 2 stroke silencer...I think it was a 447....long story short....the engine somehow sucked in a piece of mig wire and destroyed the bore and piston.

Nick.

[falconp1]

You need to gusset the exhaust as shown. This is the only thing that ever worked for me.

[Boet]

Have a nice one for you. Check your PM.

[mulderpm]

Thanks Boet for your offer. Except for the crack the exhaust is still in good condition. My AP inspected the wall thickneses and gave it the thumbs up.

The gusseting method realy makes sense. Wonder why Rotax does not do this standard....oh I suppose then they wont sell any spare parts.

[mulderpm]

Just come back from Van De Graaf who welded the Gusset on for me. I am sure she won't crack again with the gusset in place. Thanks for the great advice. I will report if there is a problem.

[falconp1]

Mine still going strong. I'm told the gusset dampens the harmonics which causes the cracking.

If you need to know more about the exhaust coating I can forward you the number.

[mulderpm]

Thanks Falcon She is coated with Aluminum....which I had to remove in the places where she had to be welded. The flat bar gusset is obviously also not coated...so yes please, can I have the number. Looking a bid shoddy with the cracks welded and now the gusset added to the ugliness.

P.S. what I find so strange is she has done in excess of 600 hrs, without cracking. She must be getting thin.

Enjoy your weekend

[falconp1]

Had mine done by these guys. Cost me R1200-00 for all the bits (exhaust and manifolds)

http://www.google.co.za/url?sa=t&rct=j& ... JMyCyvYQ-Q

Usually if it wears to thin it blows a hole but doesn't crack. It would be a pity if you spend all this tom only to find that you have a recurring problem. If the people that welded the gusset on didn't have a problem blowing holes in your silencer then it can't be to thin. Just a thought.

Have a good one Paul

[mulderpm]

Thanks Falcon. Those are the guys I heard about. Ididn't realise it was so expensive. I agree, before I spend the lute lets see if the gusset solves the problem on my exhaust. The guys that welded it did not have blow holes ! So maybe it is still ok.

[mulderpm]

25 hours later and no problems.

[bobthebuilder]

My whole exhaust was repainted with a spray can. I think it was a Sprayon product. Not the crappy black gloss stuff, but rather a brownish colour ..... Yes a bit like crap I suppose.

Once sprayed, it is baked in an oven for some time. I did this three years ago, and it still looks like the day I painted it.

Your prep must be good though. The can was fairly expensive, around three hundred bucks if I remember.

I'll see if I still have some, and will post details if I come right.

[Poens Jacobs]

Hi, Painted my exhaust with aerosol stove paint. Withstands temps of 700 degrees. Bought it at our local Mica Store. Price R90.00 Really works well.
Tends to burn away a bit at the manifold, but is fine on the exhaust!