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| piston diameter? https://www.ausmini.com/forums/viewtopic.php?f=2&t=74838 |
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| Author: | Kennomini [ Tue Jan 03, 2012 2:32 pm ] |
| Post subject: | piston diameter? |
What is the STD diameter of a 1275cc piston? and what is the diameter of a 0.080 thou over bore piston (1360)? |
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| Author: | drmini in aust [ Tue Jan 03, 2012 2:41 pm ] |
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70.6mm is std 1275 bore size. 73.0mm is +.094" (1360cc) bore size. Piston to bore clearance is around .0015"-.0035", depending whether they are cast or forged. |
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| Author: | Kennomini [ Tue Jan 03, 2012 2:48 pm ] |
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so 72.16mm is good enough so long as the block gets bored to suit? Is that still 1360cc? |
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| Author: | drmini in aust [ Tue Jan 03, 2012 2:54 pm ] |
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Kennomini wrote: so 72.16mm is good enough so long as the block gets bored to suit?
Is that still 1360cc? Nope that is +.060", = 1330cc. Still pretty good... 
Next size up from that is 72.5mm (GR pistons) = 1343cc. Why overbore it heaps if no need, it's only worth pub points... 
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| Author: | Kennomini [ Tue Jan 03, 2012 3:16 pm ] |
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drmini in aust wrote: Why overbore it heaps if no need, it's only worth pub points...
Coming from the guy with 1380's and 1412's 
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| Author: | drmini in aust [ Tue Jan 03, 2012 3:32 pm ] |
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Kennomini wrote: drmini in aust wrote: Why overbore it heaps if no need, it's only worth pub points... Coming from the guy with 1380's and 1412's Hello... both mine are 1360 bore (73mm), so there is another 1 or 2 rebores left in both. And I have a pile of std bore blocks too, so meh.
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