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Thread: Does your C180 cylinder baffle look like this?

  1. #1
    SJ's Avatar
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    Does your C180 cylinder baffle look like this?

    #5 is my hottest cylinder - not by a lot, but enough that that is the one I focus on. The oil cooler is of course in front of it, and the extra little baffle on top. Does everybody else have that extra little baffle? It's a PPonk if that matters..

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  2. #2

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    Yes. I believe it's a 185 part. I never had it with 470s.Click image for larger version. 

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  3. #3
    SJ's Avatar
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    Thanks. Man I need to clean my plane!

    sj

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  4. #4

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    My typical cruise temps.

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  5. #5
    SJ's Avatar
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    Mine are very Oat sensitive. I usually keep the cylinders under 350, but at the expense of higher fuel burn in the summer.

    sj

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  6. #6
    mvivion's Avatar
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    Quote Originally Posted by stewartb View Post
    Yes. I believe it's a 185 part. I never had it with 470s.Click image for larger version. 

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    I don't think that's a standard 185 part, but I've not flown every model year either.....

    MTV

  7. #7

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    Airplanes IO520 conversion, on 180K, baffles installed by them.

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    Unless I’m up high running peak #4 is hottest then it’s no. 5.

    Yesterday, coming back from Colorado at 11.5 / -1 OAT and running peak I had 1435 peak EGT and 345 CHT with 185 oil temp (Gill vent covers on) with all cylinders within 30 degrees EGT and 50 CHT

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    Last edited by OLDCROWE; 10-13-2019 at 08:37 AM.
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  8. #8

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    #5 cylinder baffle is part #1250134-1 or -2 for serial numbers 18502311 thru 18502392 and 18502825 and up respectively. I don't see such a part for the 180 but I didn't look very hard.

    I put mine on after Steve Knopp told me it would be a good idea since 185s use it. I didn't have a monitor back then. Now that I do I see no reason to change anything.

  9. #9
    180Marty's Avatar
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    I have a nose bowl like yours and my 470 cylinder looks like Kirby's. Looks like your engine is sagging a bit judging from the spinner and cowl position.

  10. #10
    supercub's Avatar
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    Might want to check your motor mounts, appears your engine is sagging some. Could be somewhat disrupting the air flow for proper cooling.
    Last edited by supercub; 10-13-2019 at 12:50 AM.
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  11. #11
    skywagon8a's Avatar
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    sj, There is supposed to be a narrow baffle which goes between the oil cooler and the cylinder. Do you have one installed?
    N1PA

  12. #12
    SJ's Avatar
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    Yes, I have one installed, I was wondering if I was supposed. BTW, I have the anti-thrustline mod. That is why it looks like the engine is sagging... I'll have Pierce check his photo archive of when the engine was put in for comparison.

    sj
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  13. #13
    skywagon8a's Avatar
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    sj,
    I seem to recall there should be a large thick washer between the engine mount and the firewall at the lower bolts. I'd have to check the manual.
    N1PA

  14. #14
    SJ's Avatar
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    These are shots from the 2010 WAD, soon after the engine install (with rebuilt or new motor mount). Looks like the cowling has never lined up quite right with the spinner.

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    Tim let me land at his house...
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  15. #15
    hotrod180's Avatar
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    Curious if youre running the orginal 470A/J mount (with the vertical rubber isolators)?
    Cessna Skywagon-- accept no substitute!

  16. #16
    SJ's Avatar
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    It's a 520 case, not sure if it matters, I do think we used the original mount but would need to check the logs.

    sj
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  17. #17

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    My #2 and #5 run the hottest. I also have that baffle on top of the #5 cylinder - I installed it when I did the IO470 upgrade.

  18. #18
    Steve Pierce's Avatar
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    It is the original engine mount with the orginal engine mount legs off the O-470 installed on the O-520 crancase used in the P-Ponk conversion. Baffles were new from Airforms with some tweaks recommended by Steve Knopp. I don't think the engine ever fit exactly in the center of the opening. This is when installed in 2008.
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    Steve Pierce

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  19. #19
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    Click image for larger version. 

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    Pete is referring to these washers I think.
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    Steve Pierce

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  20. #20
    SJ's Avatar
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    I remember the fun you had replacing that gascolator...

    Thanks!

    sj
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  21. #21
    Steve Pierce's Avatar
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    Quote Originally Posted by SJ View Post
    I remember the fun you had replacing that gascolator...

    Thanks!

    sj
    Wasn't that long after the engine change or am I thinking of the Super Cub?
    Steve Pierce

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  22. #22
    supilot's Avatar
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    I think I have a pretty similar setup SJ, but I don’t have that extra little baffle. Did airforms as well, with no modifications required minus blocking off a couple port holes not used on our early model configurations. Not sure why uploading from my iPhone rotated the pictures. 1955 180.



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  23. #23
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    Quote Originally Posted by SJ View Post
    I remember the fun you had replacing that gascolator...

    Thanks!

    sj

    Oh that one is easy to get to. The one in the 206 is way up under the nose strut.

    520 in my 206 has that baffle in place. 550 in other 206 that I know of is missing that baffle. 550N in columbia does not have it. 470 in 1976 182 does not have it.

    Tim

  24. #24
    SJ's Avatar
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    Quote Originally Posted by Steve Pierce View Post
    Wasn't that long after the engine change or am I thinking of the Super Cub?
    No, it was on this plane - and it was a while after. would not want to make it easy with the engine off an all...
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  25. #25
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    Quote Originally Posted by Steve Pierce View Post

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    Mine is similar, except with a stock 470K.
    I had to repair a crack in the engine mount a couple years ago,
    the Lord rubbers were sagging in the extreme so I replaced them.
    I'm expecting to need to do an engine overhaul before too many more years go by,
    at which time I'm planning on installing a later model mount which uses the horizontal-ish rubbers.
    I think they hold up a lot better, plus based on an old service letter (SL180-1) I hope that arrangement will be a lot smoother.

    FWIW from the photos, SJ, it kinda looks like your engine might be sagging down a bit lower now,
    compared to Steve Pierce's photo from 2008 in post #8.
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  26. #26
    Steve Pierce's Avatar
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    Quote Originally Posted by SJ View Post
    No, it was on this plane - and it was a while after. would not want to make it easy with the engine off an all...
    This is how I can tell how long ago things were now. He is bigger and taller than me. I miss that kid running around the hanger getting into stuff.
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    Steve Pierce

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  27. #27

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    Log book time and Lee Pierce growth rings, do not always appear to coincide.
    Last edited by OLDCROWE; 10-14-2019 at 01:05 PM.
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  28. #28

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    This is a very common problem, and best fix is to use the Martin Aviation replacement baffle, ~$500. This cools #5 and #3. Call them for details 318-574-5855

  29. #29

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    1975 180J with Texas Skyways O-520

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  30. #30
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    Quote Originally Posted by hotrod180 View Post
    ….I'm planning on installing a later model mount which uses the horizontal-ish rubbers.
    I think they hold up a lot better, plus based on an old service letter (SL180-1) I hope that arrangement will be a lot smoother.....
    To elaborate a bit on my thread drift:

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  31. #31
    SJ's Avatar
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    So I went down to look for saggy mounts... they don't look too saggy to me... click to enlarge.

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  32. #32
    behindpropellers's Avatar
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    Mount looks great but is the saftey wire missing from that bolt

  33. #33
    Gordon Misch's Avatar
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    And type "A" screw in tinnerman nut.
    Gordon

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  34. #34
    SJ's Avatar
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    Quote Originally Posted by Gordon Misch View Post
    And type "A" screw in tinnerman nut.
    They fall right out! I have a pile of tinnermans, just need to replace it I suppose...
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  35. #35

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    From the looks inside the cowling your 180 is channeling its inner radial self.
    Remember, These are the Good old Days!
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  36. #36
    Gordon Misch's Avatar
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    SJ, I was just giving you a rash, because I know I read somewhere that Tinnerman nuts require type B screws, due to difference in thread pitch and very slight difference in root diameter between type A and type B. In my experience the type B screws seem to hold better.

    The Specification Chart part of this page https://www.aircraftspruce.com/catal...?clickkey=5485 indicates type B.

    However, page 68 in this pdf seems to permit either. https://spaenaur.com/wp-content/uplo...s-C67-C101.pdf

    So now I'm confused. Can you pros out there set me straight (with certainty, rather than just opinion)?
    Gordon

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  37. #37
    Alex Clark's Avatar
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    I do not have it on my P-Ponked 180
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  38. #38

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    I do have the baffle on my 1976 Pponk 180. And my #5 runs hot.


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  39. #39

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    The three variables. Balance tube, induction, and fuel flow. But that said, I wonder if that baffle increases heat at #5 or reduces it.

  40. #40

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    There is a very old Cessna SB that calls for the addition of that #5 baffle for the IO470 to even out cooling.

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