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Numbers on pistons

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xbellx

Post subject: Numbers on pistons

Posted: Sat Nov 28, 2009 3:29 pm

848cc

Joined: Tue Jul 28, 2009 2:53 pm
Posts: 11
Location: Heidelberg

Pulled the head off my 1275 & the pistons have stamped on them

1253 + 1.524 Inderstand that the 1.524 is 60thou over but what does the 1253 stand for. They are dished pistons.[/b]

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drmini in aust

Post subject:

Posted: Sat Nov 28, 2009 4:01 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39764
Location: near Baulkham Hills, NSW

Pistons are Hepolite 21253 probably.
These are 9.75:1 C/R (actually a bit more in early blocks).
They are more expensive than the 21251 (8.8:1), but are a stronger piston.

Ring widths in these pistons are metric, which is a pity- the original rings are expensive and there are no or few alternative suppliers.

_________________
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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xbellx

Post subject:

Posted: Sat Nov 28, 2009 4:05 pm

848cc

Joined: Tue Jul 28, 2009 2:53 pm
Posts: 11
Location: Heidelberg

Thanks Doc

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