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Thread: Borer 80" for O-320-B2B

  1. #1

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    Borer 80" for O-320-B2B

    Hey all,

    I'm looking to see if anyone has an 80 inch Borer for my PA-18 with a 160hp O-320 for sale.

    I'm located in California with cash in hand.

    Thank you and Happy Landings,

    Matt
    KIYK, CA

  2. #2
    RaisedByWolves's Avatar
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    I have one on my wall as a spare, I might be able to be convinced to sell it


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  3. #3
    Steve Pierce's Avatar
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    Why 80"? The STC allows 82" and more is better.
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers
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  4. #4

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    Steve,
    Thanks I don't know why I said 80 vice 82. For a 160, I'm hearing 43 pitch is best. Thoughts?

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  5. #5

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    82/43 is what all the cool pilots run.
    DENNY

  6. #6

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    What is the difference in performance with the 82/43 compared with the 82/44? Why do some go with the 82/44?

  7. #7

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    Speed wise it is about 2 1/2 - 3 mph per inch of pitch. So a 44 is going to be faster than a 43 at 2400 RPM. It does not sound like a lot but if you have 2-3 hours one way to the hunting spot it all adds up A 43 will will get you off the ground a bit sooner, however a lot of that is pilot dependent. If you mission is not short and heavy go with the 44.
    DENNY

  8. #8

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    Denny is right however sometimes the difference between hitting the middle of the tree or the top of the tree is a couple inches of pitch. I’ll take a 41 all day. Maybe a 40 if the tree is really big!
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  9. #9

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    Thanks. I have a 44 but I am still slow! Maybe 90 mph with the RPM at 2500, 160 horse. Goodyear 26, so not overly a speed drag and nothing else too draggy out there. Maybe I am a bit forward CG, seems to like to get off the ground better with 170 pounds in the back seat, go figure? A work in progress for me, thanks again for the ideas and inputs.

    Oh yeah, a big pod, I guess that takes a bit off the speed too of course.
    Last edited by Skysurfer; 11-13-2020 at 04:54 PM. Reason: Forgot about that

  10. #10

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    Check the engine mount rubbers. Mine had a lot of sag at 1,000 hours. I gained 3 mph when I put in new ones. It is a thrust line issue.
    DENNY

  11. #11
    mike mcs repair's Avatar
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    Quote Originally Posted by Skysurfer View Post
    Thanks. I have a 44 but I am still slow! Maybe 90 mph with the RPM at 2500, 160 horse. Goodyear 26, so not overly a speed drag and nothing else too draggy out there. Maybe I am a bit forward CG, seems to like to get off the ground better with 170 pounds in the back seat, go figure? A work in progress for me, thanks again for the ideas and inputs.

    Oh yeah, a big pod, I guess that takes a bit off the speed too of course.
    Bucket of state runway gravel in back when empty. Dump it at your remote strip. Then put in your load. That what my stepfather windy said Denny Thompson always did with his maule. Eventually he had a nice gravel runway...


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  12. #12
    Steve Pierce's Avatar
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    I have a 160 hp and a 4182, it pulls good but will redline when I quit pulling on the stick. For my mission the lower pitch works best. Sure I'd like to go faster but have flown the same airplane with a 41 and a 43 I really never noticed a difference in cruise.
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers
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  13. #13

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    Denny,
    I will look into that, thanks. It has Thrustline.
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  14. #14
    skywagon8a's Avatar
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    Quote Originally Posted by Skysurfer View Post
    Thanks. I have a 44 but I am still slow! Maybe 90 mph with the RPM at 2500, 160 horse. Goodyear 26, so not overly a speed drag and nothing else too draggy out there. Maybe I am a bit forward CG, (YES) seems to like to get off the ground better with 170 pounds in the back seat, go figure?
    As mike says: "Bucket of state runway gravel in back when empty." Or alternatively a smaller amount of permanent ballast at the tail.
    Airplanes with trimming stabilizers cruise faster, climb faster and fly slower when operating at or near their aft CG limit. This is because the stabilizer is unloaded, thereby reducing it's drag and reducing the added perceived load which the wings must carry.

    If you are a heavy person, it is very likely your plane is loaded at or forward of the forward CG limit when flying solo.
    N1PA

  15. #15

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    200 lbs. The difference withweight in back is an eye opener. I like the gravel idea. Thanks.

  16. #16
    skywagon8a's Avatar
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    Quote Originally Posted by Skysurfer View Post
    200 lbs. The difference with weight in back is an eye opener. I like the gravel idea. Thanks.
    Of course it's your option, you should be aware that it is not unusual for an airplane to have some permanent lead ballast as far aft as possible for just the reason you describe.
    N1PA

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