Browncbr1 Posted July 13, 2015 Report Posted July 13, 2015 Last winter, I was getting a little PPM through the heater, so I closed off the heat and just watched my CO monitor to make sure none was coming in since then. However, I want to replace the muffler before Fall. So, I'm trying to decide if I should go with ribbed or posts... Does anyone have experience with ribbed vs posts versions? Honestly, not sure which one is on there now... will the ribbed version provide plenty of heat?? Quote
N601RX Posted July 13, 2015 Report Posted July 13, 2015 One of the exhaust websites has some information about both options. I don't remember which it said provided the most heat. Quote
Browncbr1 Posted July 13, 2015 Author Report Posted July 13, 2015 i know the post version provides the most heat, but just wondering if it is really needed in the SE climate.. ?? Quote
orionflt Posted July 13, 2015 Report Posted July 13, 2015 here is the simple question, will it only be used in the south east and no where else where you may want the best amount of heat? and as you have already proven you can shut the heat off if you do not need that much. so what's your question, Just sayin. Brian Quote
Browncbr1 Posted July 13, 2015 Author Report Posted July 13, 2015 I guess my question is,... has anyone ever been too cold with a ribbed muffler? Quote
jamesm Posted July 13, 2015 Report Posted July 13, 2015 I have a '67 M20C, If I remember correctly.... the post style was on the earlier model Mooney up until til say '65 or '66 ish years the 67's I believe have ribbed with ball joints at the exhaust ports to the engine. Which latter model they gone to slip joint type of the exhaust stacks. It is my understanding that post type exhaust could have a potential of partially plugging up the exhaust causing engine performance issues should several of the posts let go. Not to mention the post in a more concentration points for corrosion to cause a potential failure. I would suspect you have a ribbed style with ball joints going to your engine exhaust stacks. Over the years I could not find anyone that carried the ball joint type and was willing to weld them on my exhaust stack so had to convert to slip joint type which can siege up and cause a lot problems with cracking they pipes and leaks and so on.. I have had good luck with Dawley ,when other popular aircraft welding out fits didn't want to or could not do the job Dawley came through . Dawley did a great job and I think it has been about 8 years with no troubles. http://www.dawleyaviation.com/index.php/about-us I haven't booth style exhaust side by side to compare the heat output but I believe the ribbed is more common in latter model Mooney's and easier to get parts. I am in the pacific northwest it doesn't get that cold here compare to northeast or say Boston this year. The heater works haven't really flown in weather below 0 degrees F only about 20 dof. so how much is heat coming out of the heat muff is relative unit of measure. Hope this helps. James '67C Quote
Browncbr1 Posted July 13, 2015 Author Report Posted July 13, 2015 Hi James, Thank you for the feedback. Now, I figured it all out.. i have the ball joints with ribbed muffler and AWI won't support the ball joints as you said.. Neither will the other guys... looks like I will have to buy new risers, which I don't need and have them drilled again.. booo I knew i couldn't get out of this issue for a reasonable cost. Quote
Shadrach Posted July 13, 2015 Report Posted July 13, 2015 Interesting. I have a 67F and I have slip joints at all of the exhaust stacks. The only ball joint goes from exchanger/muffler to the exhaust pipe. Mine is ribbed and Dawley rebuilt it about 10 years ago at a cost of around $500 IIRC. Why not call Dawley? There may be no need to replace the ball joints. Quote
jamesm Posted July 13, 2015 Report Posted July 13, 2015 Depending on the condition ... They might be able salvage the existing parts. Give a Dawley a try. I can't do anything about the cost... if it is maintain correctly hopefully this last for many years to come and help take out the initial cost sting. I wasn't fan of the slip joint exhaust but had no choice . Quote
Browncbr1 Posted July 13, 2015 Author Report Posted July 13, 2015 I just called Dawley.. they said to repair the ribbed is $600... or if it has studs, then its $1200...... and two weeks lead time... After talking to AWI and also Aircraft exhaust, it seems I can get an entirely brand new PMA system with risers and all for $1400-1500.. I may do that just to avoid down time.. Quote
jetdriven Posted July 13, 2015 Report Posted July 13, 2015 What can AWI rebuild th muffler for? They sctually replace everything it's really a new one. Quote
Browncbr1 Posted July 13, 2015 Author Report Posted July 13, 2015 they don't do the ball joint style anymore... they will only do slip on style, which requires purchasing new risers.. Quote
Alan Fox Posted July 13, 2015 Report Posted July 13, 2015 Ribbed verses Studded........Hmmmmmm..... 1 Quote
Guest Posted July 14, 2015 Report Posted July 14, 2015 Ribbed verses Studded........Hmmmmmm..... I just knew it wouldn't take too long!! Clarence Quote
47U Posted July 19, 2015 Report Posted July 19, 2015 You might give Knisley a call. They rebuilt my tailpipe with a new ball a few years ago. A few years before that my #3 flange cracked and they rebuilt that stack with a new ball, too. My muffler was tweaked and it didn't fit so they had me bring over the whole exhaust and they got it lined up on their fixture. It helps (a lot) that I'm local... knisleyexhaust.com Quote
Browncbr1 Posted July 20, 2015 Author Report Posted July 20, 2015 Thanks. I'll give them a call. Quote
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