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In Reply to: 3.3 or 3.5L Swap for 74 CS posted by Perry on August 24, 2001 at 17:27:36:
you'll need to also swap a newer (5-speed) tranny in or use the motronic bellhousing to make the stock one work.
the USA 3.3's (and maybe early 3.5's?) are really low compression low-power setups for smog. They won't be any better-performing (worse possibly?) than a 3.0. Not sure what motors this is true for, but the Euro 3.3's were very cool.
People seem to like the late motors from a 635csi or the like with Motronic and all, especially the ones you can use a performance chip on.
Anyway, you'd want to think about...
Are you going to use stock carburetors? different carburetors? L-jet? Motronic?
is ability to pass smog in your area still an issue?
'never heard of an M3 swap, but I bet there's a good reason for why. But I also bet with enough money thrown at it you could put any motor in there, people have done M5 motors for example. Those people spent a lot of money.
Another option to consider: you can buy a crate motor from BMW (it's like a brand new original motor, around $3-4k or so) and swap it.
I'm probably going to go that route myself when the time comes, but I'm not sure.
-Andrey
I've been convinced it's time to swap out the motor, and have heard various opinions on 3.3 versus 3.5 alternatives. I'd love to hear experienced voices. Also, a couple of topics I'd also appreciate commented on:
1) price expectations for the job (all inclusive)
2) is an M3 conversion just too complicated? (the concept is salivating :)
3) any gotchas or things to be aware of going in?
4) anyone have recommended sources for the work in Colorado?
All input greatly appreciated.
Perry
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