What do I need to build a 3.4 from a 3.0?

[JP911]

I'm ready to start collecting parts for a 3.0 to 3.4 engine build using CIS (similar to rdane's setup). It will be primarily for street use, with the occasional track day. I currently have the original 2.7 in my car, but have a good lead on a 3.0 longblock. So what parts do I need to build the 3.4?
New Crank?
Which P/Cs?
Distributor?
Will my SSIs and single out Dansk be sufficient?
Which cams?
Will the CIS on my 2.7 work on the 3.0?
Etc...

[Shuie]

New Crank? ->74mm crank from a 3.2 Carrera

Which P/Cs? ->98mm Max Moritz with 23mm wrist pins

Distributor? ->Flip the drive gear on the crank? I had not thought about this part of the conversion

Will my SSIs and single out Dansk be sufficient? -> you are good to go here

Which cams? ->20/21

I dont know about the CIS.

Dont forget about the rods either. You wont be able to use the 3.0 rods.

[vash]

didnt "rdane" just do this? you can start by kidnapping him

this will be a killer project! i cant wait. you are smogtest free next year! get personal plates fast, i like "snore" for the sleeper aspect.

[JP911]

Thanks for the help! I've read several of rdane's posts, but wasn't able to track down a complete list of what he used. I was thinking about a 3.2 swap, but I think this will be more fun! The other plus will be that it will look stock.

Cliff - How's the SC treating you? Is the 3.0 a big improvement or just different?

[emcon5]

You will probably save money by starting with a 3.2.

You won't have to do the ports, you will get the crank and rods you need, and (as much as I like CIS) the Motronic is probably more versatile. Twin plug would be easier as well if you decide to go thar way, all you would need it the splitter from andial and a 964 distributor.

You lose the whole "looks stock" thing though.

Tom

[Grady Clay]

JP911,

I agree with Tom, twin ignition is very worthwhile.

You can make a 3.0 (original 70.4 crank and rods) into a 3.3 with 100 mm P&Cs and into a 3.5 with the additional addition of 74.4 mm crank, rods, and appropriate wrist pins. It takes lots of careful work to do any of these conversions.

Yes, follow some of the experienced Pelicans. There are lots of subtle issues.

Best,
Grady

[89911]

Shown: 3.4 twin plugged motronic, 20/21 cams, etc.

I've got 275 miles on my engine, so I'm getting a better feel for it. Haven't pushed the redline yet. It's hard to tell comparison wise from the old 3.2. It definetly isn't going to challenge a Corvette off the line though. Still pulls very hard up till I let off the throttle, spools up faster and harder. I have to wait for a few hundred miles before I really push it hard.

[JP911]

89911 - If you don't mind, what exactly was required to do the 3.4 twin plug build and what was the bill?

[911nut]

89911, I got wood when I saw that picture of your motor.
I want one.

[89911]

Originally posted by JP911
89911 - If you don't mind, what exactly was required to do the 3.4 twin plug build and what was the bill?

Discretion prevents me from revealing I can give you the list after I check my receipts. Basically Mahle 3.4 P/C's, ARP rod bolts, Andial Valve springs, and a list of about a dozen or so other items that go into race hardening a 3.2 from stock. Twin plugging machining the lower head, Andial splitter, dual distributer, custom spark harness. Extrudehoned the intakes, port and polished the intake and exhaust ports. A good preface is reading the "Gold Plated Porsche" to understanding how this gets into a lot of money.