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Thread: Prop pitch..

  1. #1
    quadzilla's Avatar
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    Lightbulb Prop pitch..

    Hey there Old School Guys...

    Need a bit of information from you..!!

    I'm looking for the pitch for a solas XO prop..!!!

    I've got my XO and one of Tommy Jordan's lovely NEW pitch gauges..!!

    Now the gauge I've got shows leading edge from 13-17.. and trailing edge from 20-28..

    I think i remember the XO being something like 14.5/17.5..????? is this correct..???

    I've discovered my prop is showing about 14 leading edge and 17 trailing edge..??

    It appears by turning my nice new pitch gauge upside down....
    I can use the leading edge numbers for trailing edge measurement..

    So its a real pity leading didn't go to 18 and trailing start from 19..?? oh well..??

    I've a copy of the printable pitch gauge...
    So I'll either print it on acetate or paper then transfer the missing pitches on..???

    OK next possibly dumb ass question.. what is the difference's between an XO, an XI and a J prop..??

    Are all the hubs the same so can one be pitched into the other..
    Or does this work like the concord prop scenario...
    Where it's better to pitch a 14/20 to a 13/19 than actually buying a 13/19

    The reason i ask is my GP1200 with the Group-k motor is getting ready to be broke in..

    So my thinking is do the break-in with the XO pitched correctly then if its doable pitch it up a bit..??

    Now all this break-in malarkey is dependant on the stinking weather i'm receiving just now..
    Looks like this will be a late February thing..

    Getting back to the break-in...
    Any thoughts or opinions on....
    Run it on the hose for 15-20 minutes.!!(check for leaks..)
    Then take it to the water warm her up for 15-20minutes till the pissers are pissing good and hot..??

    Then spank the holy fuck out of it.. till that tank of gas is gone..!!
    Fill it up do the same..... Job done..!!!

    The way i see it if she's gonna break she'll break the first time you nail it anyway..??

    I'm using Pro-X first size over pistons, new rings, wrist pin bearings, etc,etc,
    This is on a fresh re-bore with a 0.005 clearance..!!!
    The workshop manual calls for a clearance of 0.0039-0.0041..
    So i figure i'm running loose enough to go straight to spank that ass..!!
    I think Pro-x asks for a clearance of 0.005..
    That's why i ask about opinions on hard or easy break-in..??

    Your thoughts on this please gentlemen and quite possibly ladies..!!

    As a final note i'm going to go with Group-K's carb setting's..!! but wind the Hi's and lows out a turn or so initially..

    Thank you for taking the time to read this short novel I've written... Sorry....!!!

    Gerry


  2. #2
    old school big raider's Avatar
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    xo-14.5/17.5 xi-15.5/18.5 j-14/20 on break in i vary the throttle for about 30 minutes with one or two cool downs then its on- i premix @32:1 with full synthetic- on carb settings group k usually sets them up fat so i wouldnt mess with settings also did they do pump or race gas porting?
    Last edited by big raider; 01-13-2008 at 11:15 PM.

  3. #3
    quadzilla's Avatar
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    Question ?

    Its the sleeper kit..

    So I'd imagine its pump gas safe..???

    Do you Know if the XO can be pitched up for more top end after the break-in..??

    So you recon Group-k's carb setting's are safe..??
    The reason i ask is the motor came to me after it lost #3

    I've went through the carbs and all seems as it should..??
    I'd like to figure out what killed it last time round..!!

    Gerry

  4. #4
    old school big raider's Avatar
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    sleeper should be 93 pump gas safe and yes you can repitch xo up but its best to go with j prop also you really need to find out cause of failure first- did you do rebuild? if so what did you find? we need more info for diagnosis- what jetting and settings are you at? stock 44's? list all mods

  5. #5
    Flying Scotsman's Avatar
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    XO 14.5 17.5
    X prop hub is diferent than a J concorde

    I use 1 2 3 blocks and a machinist protractor and eyeball the blade
    sit everything on a surface plate or a pc of flat glass.
    Pics are in the breaking in the 97 thread.

  6. #6
    old school big raider's Avatar
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    Quote Originally Posted by Flying Scotsman View Post
    XO 14.5 17.5
    X prop hub is diferent than a J concorde

    I use 1 2 3 blocks and a machinist protractor and eyeball the blade
    sit everything on a surface plate or a pc of flat glass.
    Pics are in the breaking in the 97 thread.
    think he is talking about a super camber j prop scottie- yd-sc-j 14/20 right?

  7. #7
    Flying Scotsman's Avatar
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    YD-CD 13/19 Concorde
    YD-SC-XI 15.5/18/5 X prop
    YD-SC-XO 14.5/17.5 X prop
    YD-SC-X 13/16 Concorde
    YD-SC-S 12/18.5 Concorde
    YD-SC-J 14/20 Concorde
    YD-SC-I 13/19 Concorde

  8. #8
    Flying Scotsman's Avatar
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    What compression and are you 3 piped

  9. #9
    quadzilla's Avatar
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    Lightbulb ???

    Unfortunately the motor came to me in bits..

    #3 cylinder was scared up pretty bad..!! no piston for diagnosis..??

    Motor mods are:. Riva rev b box, Pro-X 1st size over, And a Group-k sleeper kit, ported set of cylinders.,

    Matching Group-K modded head, (some damage in #3 dome.. not major..?)

    Carbs are 117.5 Lows and 135 Hi's.. (damn i can't remember for 100% sure.. i think it's these #'s through. )
    Chokes are gone.. primer installed, R & D plenum F/A, Pre-mix,

    New Stock reeds, inlet manifold tided up somewhat..

    Mild clean up of top case half..

    I think that covers the motor..??

    Gerry..

    Scott i'll check out the thread you mentioned.. Big R.. you got a name..??

  10. #10
    quadzilla's Avatar
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    Lightbulb ?

    Not three piped Scott..

    Been there done that on my GP'r..

    Can't wave-jump with the damn pipes.. SO whats the point..???

    When i wanna go flat out fast.. it'll be the 05 that's in the works for that..!!

    Compression is in the 150 range..

    I'm wondering if Group-K get this by decking the cylinders rather than skimming the head..??
    Anyone know for sure..?? the reason i ask is i have access to a stock pro-tec head..??
    I'm wondering if this would be a better option than sticking with the one i have with #3 dome damage..??
    I have in hand one other stock head.. alas with some #2 dome damage.. albeit less than the Group-k one..??

    Thanks for the input so far Guys..

    Gerry

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