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Join Date: Jul 2002
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)
Old 02-02-2006, 04:57 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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72 Carrera RS replica, Spec 911 racer
Old 02-02-2006, 07:34 PM
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thanks andy - quite a few places sell 85mm pistons EBS etc
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1969 911E (historic racer)
911ST replica (tarmac rally)
Old 02-02-2006, 07:41 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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72 Carrera RS replica, Spec 911 racer
Old 02-02-2006, 09:11 PM
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