^^^^ that means yes
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| 1275 crank https://www.ausmini.com/forums/viewtopic.php?f=2&t=68769 |
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| Author: | 76van [ Wed Feb 09, 2011 2:45 pm ] |
| Post subject: | 1275 crank |
striped my blown 1275 down, it has a 12g1505a crank. is this a large journal ? cheers jayson |
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| Author: | Hanra [ Wed Feb 09, 2011 2:52 pm ] |
| Post subject: | |
12G1505, 1275cc, Non-S, EN16T with 1.75" dia. big ends. http://www.calverst.com/articles/Eng-Cr ... tionID.htm |
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| Author: | TheMiniMan [ Wed Feb 09, 2011 3:06 pm ] |
| Post subject: | |
^^^^ that means yes
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| Author: | 76van [ Wed Feb 09, 2011 3:43 pm ] |
| Post subject: | |
thanks guys |
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| Author: | drmini in aust [ Wed Feb 09, 2011 6:22 pm ] |
| Post subject: | |
Crack test before you grind it, cracking is common in these. Of 6 big J cranks that St George Cranks got in to grind a while ago, 4 were cracked already. 
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| Author: | Convertible Mini [ Wed Feb 09, 2011 7:31 pm ] |
| Post subject: | Large journal crank. |
Make sure that it has not been offset ground to make a stroker. Check which rods it was used with !!! Might be a stroker !!! |
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| Author: | 76van [ Thu Feb 10, 2011 5:36 am ] |
| Post subject: | |
thanks doc,what do they do to crack test them ? convertible mini,how do i now if it`s been strocked ? is standard bore if that helps. cheers jayson |
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| Author: | graham in aus [ Thu Feb 10, 2011 9:25 am ] |
| Post subject: | |
76van wrote: thanks doc,what do they do to crack test them ?
Dye penetrant crack testing, either a two stage (red dye then white powdery paint) Dye penetrates the crack, then bleeds back to show through white second coat. http://www.twi.co.uk/content/ksijm001.html http://en.wikipedia.org/wiki/Dye_penetrant_inspection Or fluorscent dye penetrant, spray the crank, then look at it under fluorscent light to see where dye has penetrated crack. http://www.marinediesels.info/repairs/c ... ection.htm Both these techniques (I think) can be aided by magnetising the test piece to concentrate the dye into the crack. 
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| Author: | slinkey inc [ Thu Feb 10, 2011 10:39 am ] |
| Post subject: | |
76van wrote: thanks doc,what do they do to crack test them ?
convertible mini,how do i now if it`s been strocked ? is standard bore if that helps. cheers jayson Measure the diameter of the bigends. I'm not sure of the numbers off the top of my head but you can grind these down to accept the 'S' conrods, and if you offset grind these you can either increase or decrease the stroke of the engine. I think it's covered in Vizard's Tuning The A-Series Engine (the yellow book). |
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| Author: | 76van [ Thu Feb 10, 2011 3:45 pm ] |
| Post subject: | |
ahh ok,thanks guys. i have vizards book will look into it. cheers jayson |
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