Welcome! Becoming a registered user of ShortWingPipers.Org is free and easy! Click the "Register" link found in the upper right hand corner of this screen. It's easy and you can then join the fun posting and learning about Short Wing Pipers!

Page 27 of 27 FirstFirst ... 17252627
Results 261 to 269 of 269

Thread: Leading Edge Exhaust

  1. #261
    Yellow Baron's Avatar
    Join Date
    Jul 2010
    Location
    Johannesburg, S Africa
    Posts
    184
    Post Thanks / Like

    Default Re: Leading Edge Exhaust

    Here I am back again at it. Muffler ends and pipes lengthened to get a minimum of 2" overlap on the slip-joints. Wrapped the muffler in a blanket for good measure too.

    IMG_1830.jpg

    IMG_1826.jpg

    IMG_1827.jpg

    IMG_1833.jpg

  2. #262
    Yellow Baron's Avatar
    Join Date
    Jul 2010
    Location
    Johannesburg, S Africa
    Posts
    184
    Post Thanks / Like

    Default Re: Leading Edge Exhaust

    New clamps with alignment dowel. Lots of Holts gum-gum, - no more leaking here!.

    IMG_1847.jpg IMG_1849.jpg

    added a little cage/bale too

    IMG_1836.jpg
    Last edited by Yellow Baron; 04-06-2018 at 02:09 PM.

  3. #263
    Yellow Baron's Avatar
    Join Date
    Jul 2010
    Location
    Johannesburg, S Africa
    Posts
    184
    Post Thanks / Like

    Default Re: Leading Edge Exhaust

    Finally, to get the cockpit entirely CO2 free (my Draeger CO2 alarm kept on going off during descent/touch down and landing) we lengthened the tailpipe:

    IMG_1939.jpg IMG_1941.jpg IMG_1942.jpg IMG_1943.jpg

    Before it was a tad on the short side:

    IMG_8891.jpg

    and you can see I had previously lengthened the lip to improve cooling airflow before I took the time replacing the old leaky 0-320 baffling with a proper fitting 0-360 kit from VANS recently.

    I now took that extra lip off again, since my new baffling now gives me up to 6.5" water pressure differential between top and bottom of engine and all CHT's and OT are well within limits.

    I flew several tests with pressure probes top and bottom, before and after oil-cooler, at the exit lip (with and without the extension) and temperature probes top and bottom of cowl, behind oil cooler, etc.

    The only temperature that I am still a bit worried about is at the exit lip / bottom of the firewall - regardless of OAT (55-70 F)and engine temps it reaches 178 F on that spot. - Above the muffler and magnetos (on the low pressure side) my under-cowl temp is 122 F. Below the cylinders and exhaust risers in the middle/bottom part of the cowl it is 154 F.
    Its just at the exit where the pressure differential is at its greatest (7.5") that the heat seems to be concentrating and rising to 178 F.

    It must have been that way for a while and it also 'cooked' my EI fuel pressure sensor (I now blanked it off untill I find a way to drop the temp there). Anybody ever measured the temp there under similar OATs (55-70 F)?
    Last edited by Yellow Baron; 04-06-2018 at 03:11 PM.

  4. #264
    Pacerfgoe's Avatar
    Join Date
    Nov 2009
    Location
    Close to Edmonton, Alberta
    Posts
    660
    Post Thanks / Like

    Default Re: Leading Edge Exhaust

    Nice to see you have found/made a solution to your exhaust problems, I like that new tailpipe....CO2 is bad news, I got a dose of it once.
    I wonder if you got an O-320 exhaust system instead of a O-360 system, the 360 is a touch wider, so the pipes should be longer, and if so, that would explain your minimum overlap on the muffler tubes.

    Why not duct a 1" scat hose to your pressure sensor to keep it cool?
    Forrest Miller

  5. #265
    Yellow Baron's Avatar
    Join Date
    Jul 2010
    Location
    Johannesburg, S Africa
    Posts
    184
    Post Thanks / Like

    Default Re: Leading Edge Exhaust

    Quote Originally Posted by Pacerfgoe View Post
    Nice to see you have found/made a solution to your exhaust problems, I like that new tailpipe....CO2 is bad news, I got a dose of it once.
    I wonder if you got an O-320 exhaust system instead of a O-360 system, the 360 is a touch wider, so the pipes should be longer, and if so, that would explain your minimum overlap on the muffler tubes.

    Why not duct a 1" scat hose to your pressure sensor to keep it cool?
    That is exactly what I was planning as my next move ...

  6. #266
    Yellow Baron's Avatar
    Join Date
    Jul 2010
    Location
    Johannesburg, S Africa
    Posts
    184
    Post Thanks / Like

    Default Re: Leading Edge Exhaust

    Here is the hot spot

    IMG_8665.jpg

    IMG_8666.jpg

    The pressure sensor goes vertical just next to the pump ....


    Sent from my iPad using ShortWingPipers.Org mobile app

  7. #267
    Yellow Baron's Avatar
    Join Date
    Jul 2010
    Location
    Johannesburg, S Africa
    Posts
    184
    Post Thanks / Like

    Default Re: Leading Edge Exhaust

    Here is the progress to wrapping up the fuel system similar to the PA28-180 front end with a 2" tube delivering cold air the box

    IMG_8937.jpg IMG_8936.jpg

  8. #268
    Yellow Baron's Avatar
    Join Date
    Jul 2010
    Location
    Johannesburg, S Africa
    Posts
    184
    Post Thanks / Like

    Default Re: Leading Edge Exhaust

    Quote Originally Posted by Yellow Baron View Post
    Here is the progress to wrapping up the fuel system similar to the PA28-180 front end with a 2" tube delivering cold air the box

    IMG_8937.jpg IMG_8936.jpg
    IMG_8716.jpg

    IMG_8715.jpg

    Itís done ó blowing 60 degrees F ambient air from the front baffle onto my fuel pump, flow meter and pressure meter. Temperature outside the box 212 degrees F, inside 140 F significant improvement to almost boiling that AvGas.




    Sent from my iPad using ShortWingPipers.Org mobile app

  9. #269
    Pacerfgoe's Avatar
    Join Date
    Nov 2009
    Location
    Close to Edmonton, Alberta
    Posts
    660
    Post Thanks / Like

    Default Re: Leading Edge Exhaust

    Glad to see you got that fixed...
    Forrest Miller

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •