how do you make a 1293 engine
Posted 18 February 2005 - 08:40 AM
i reckon it has +20 dished pistons to add 18cc am i correct on this one
Posted 18 February 2005 - 09:29 AM
Posted 18 February 2005 - 09:34 AM
1293 is the smallest re-bore you can easily get pistons for in a 1275, being a plus 20. A plus 60 rebore would be a 1330.
And offset bored, linered cylinders and stuff? Hmmmn, a little knowledge is a dangerous thing sound familiar?
Posted 18 February 2005 - 02:07 PM
the +20 pistons do come in to size tho as in the dished part
they do one that gives you 6cc and ones that give you 18cc
so it could be a 1281 or it could even be a 1275 or it could be a 1330
who knows but then who cares
Posted 18 February 2005 - 03:16 PM
The +20 means they are 20 thou larger in diameter which gives greater swept volume. The dish is not part of the swept volume of the engine, it's part of the combustion chamber volume. The dish is still there at the top of the stroke just as it is at the bottom, so any volume of gasses which are filling the dish at the bottom of the stroke were already present at the top and so have not been drawn into the engine. It's a 1293. Bore and stroke are all you use to calculate volume of an engine, dish volume is part of compression calculations.
Posted 18 February 2005 - 03:44 PM
Posted 19 February 2005 - 09:54 AM
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