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Location: Sydney, Australia
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Converting 2.4 to 2.3
Is it possible/advisable to bore stock 84mm 2.4 cylinders out to 85mm in order to use them in a 2.3 short stroke motor?
(66 x 85 is required by rules of historic race series) Also, could the 2.4 heads be used with the 85mm cylinders? My starting point is a 2.4E (possibly 2.4S - haven't looked inside) spec motor.
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Cheers, Ryan 1969 911E (historic racer) 911ST replica (tarmac rally) |
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02-02-2006, 03:57 PM
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you would be basically doing a .020 inch overbore (.5mm off the walls). That should be ok. The problem will be finding pistons to match.
-Andy
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02-02-2006, 06:34 PM
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thanks andy - quite a few places sell 85mm pistons EBS etc
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02-02-2006, 06:41 PM
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My Haynes manual shows a second oversize bore is up to 84.53mm. You'd be going bigger than that but not by much. I assume these are Biral cylinders? Just take a look at them and see how much iron will be left after the overbore.
-Andy
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02-02-2006, 08:11 PM
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