Fitting a 3.0 24v engine to a 3.0 12v Spider - Alfa Romeo Forum
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Fitting a 3.0 24v engine to a 3.0 12v Spider

My Son has a 1996 LHD 3.0 12v (Euro 1) Spider, that has serious knocking, local indie thinks its big ends, but we haven't taken apart yet to investigate. To get the car going quickly we are thinking of replacing the engine, so we can rebuild/ refurbish his engine without rushing


1) I have a 24v engine from a 2001 Spider, with a cracked cylinder head - can we use the bottom end from that engine and swap on the 12v heads?

2) Buy a complete 24v engine from a 1998 166 (not sure if its euro 1 or 2) - will this fit straight in and work with the original ECU etc?

For both options:

Will either 24v engine fit the 12v 5 speed gearbox?
Are there any components/fittings on the 24v engines that are incompatible with the 12v Spider?
What ancillary parts do we need to also fit from the donor/ refit from the 12v engine?

Thanks in advance


PS does Euro 1,2,3 equate to CF1,2,3?
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1) First reaction is nope....but, having said that, the later turbo engines are an odd mix of 24V bottom end & 12V top end parts so nothing is impossible I suppose.
2) Qualified yes, but assorted issues will need sorting - not a 5 minute job. Not one I've done myself but I believe it has been done successfully.

All the Busso V6 engines fit all the V6 gearboxes but again, some caveats. Type of clutch could be an issue (push or pull) as well as sizing. You can swap flywheels around to suit. Ideally in the perfect world, it would want rebalancing as an engine but in practice, for a quick job, not a problem.

PS Yes. For the sake of sanity, stick with a similar standard of donor engine I'd think.
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Would it not make sense to get another 12V head (or even whole/short engine?) from a breaker - they will be used in different Alfa's I suppose?

I do think you would spend asmuch time finding and working out how top make the 24V work (I think personally its a hard one) than actually taking out the 12V and simply refurbing it.
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12v , 24v , engine , fitting , spider

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