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Kennomini
 Post subject: piston diameter?
PostPosted: Tue Jan 03, 2012 2:32 pm 
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1275cc
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Location: Yandina,Sunshine Coast,QLD
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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drmini in aust
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PostPosted: Tue Jan 03, 2012 2:41 pm 
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Location: near Baulkham Hills, NSW
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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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
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Kennomini
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PostPosted: Tue Jan 03, 2012 2:48 pm 
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1275cc
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Location: Yandina,Sunshine Coast,QLD
so 72.16mm is good enough so long as the block gets bored to suit?
Is that still 1360cc?

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drmini in aust
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PostPosted: 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... 8)
Next size up from that is 72.5mm (GR pistons) = 1343cc.

Why overbore it heaps if no need, it's only worth pub points... :P

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
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Kennomini
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PostPosted: Tue Jan 03, 2012 3:16 pm 
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1275cc
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Location: Yandina,Sunshine Coast,QLD
drmini in aust wrote:
Why overbore it heaps if no need, it's only worth pub points... :P

Coming from the guy with 1380's and 1412's :lol:

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drmini in aust
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PostPosted: 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... :P

Coming from the guy with 1380's and 1412's :lol:

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. :P

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
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