convert 911 3.2L to 4.2L?

[Chineras]

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I have a 2004 911 4S (996) with a cracked cylinder. I am having the engine rebuilt by an outfit in LA called Vision Motors. They have asked if I would like to bore it out, put in chromoly sleeves and up the displacement to 4.0L or 4.2L.

Question: Is this a good idea? Will the rest of the car be able to handle the extra HP? Should I upgrade the oil cooler or add a performance clutch? How about the deep oil sump?

Any thoughts or advice would be appreciated

[Rodsrsr]

A 2004 would have a 3.8 not a 3.2 and the extra hp would probably be modest. I'm sure others will chime in but I always thought the correct way to gain displacement was to change the cylinders and pistons. Boring out and sleeving seems like something you would do to a SBC, but I may be wrong.

[Flieger]

"changing the cylinders" doesn't happen on the water heaters. They have half blocks with liners from the factory.

[Flieger]

"Nickies™" for the Porsche Boxster, Cayman, and 911 Models

[Rodsrsr]

Ouch....Does that mean he has a cracked block?

[safe]

Originally Posted by Chineras

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I have a 2004 911 4S (996) with a cracked cylinder. I am having the engine rebuilt by an outfit in LA called Vision Motors. They have asked if I would like to bore it out, put in chromoly sleeves and up the displacement to 4.0L or 4.2L.

Question: Is this a good idea? Will the rest of the car be able to handle the extra HP? Should I upgrade the oil cooler or add a performance clutch? How about the deep oil sump?

Any thoughts or advice would be appreciated

If it's cracked and your gonna repair the engine, sure, why not!
It won't cost you much more than a set of pistons, you might need new pistons anyway.
Maybe stay away from the extreme 4.2, haven't seen more than 4.1 before, might be stretching it too much.

The rest of the car will handle it, no problems, but you will need to reprogram the chip or put in a piggyback.

[911SauCy]

I'd jump all over it!

When is the next time you'll have these guys pulling your engine apart?

As far as supporting add-ons, I'm sure they won't leave you high and dry...just be prepared to pay