3.2 upgrade

Norm Faustino · Norm Faustino's Garage

I was wondering if anyone can tell me about a 3.2 liter upgrade from a 3.0 liter ? is there any machiing on the cases involved or is this a fairly simple straight forward conversion to do. I have SSI exhausts and CIS injection. are there any drawbacks in combining these systems?

thanks!

Norm :

Jim Smolka · 12-10-2001, 04:36 PM

Though I cannot give the specifics for an upgrade, it may be cheaper to sell your 3.0 and buy a 3.2. Also you get the DME FI system.

Just my $0.03 worth.

MRM · 12-10-2001, 07:16 PM

Bruce Anderson talks about this modification in The Porsche 911 Performance Handbook. He calls it "A really nice conversion". He says: "The only changes made in these conversions were a new set of pistons and cylinders and resetting the fuel mixture, yet 220 hp was claimed as the output." Unfortunately you have to use very expensive Mahle pistons to make the conversion.

Anderson says that Max Moritz, a well known tuner, had Mahle make pistons with wedge shaped cones that improved fuel efficiency. He goes on to say that this conversion can be combined with Weber carbs, the SSI exhaust conversion, and a milder cam, like the "S" cam, for something very good. This requires additional valve clearance for the new cams, but apparently is otherwise "bolt on".

As stated above, the only real problem with this is the cost. The pistons and rings alone will cost a few thousand dollars. Opening the engine to make even the "bolt on" modifications will cost you more. I would take the 220 hp claim with a grain of salt. Notice Bruce Anderson doesn't make the claim, he merely reports that someone else makes the claim. Money-wise you may do better to buy a Carrera in the dollar per horsepower race. But still you will get a considerable hp increase.

If you want a high horsepower SC, or just plain want to keep your car, this is not a bad way to go. Get a copy of Bruce Anderson's book and start dreaming. It's what keeps me awake at nights. BTW, you can get it from Pelican.

RLJ · RLJ's Garage

Here is another way to skin the kitty.

Bore and sleave your cylinders to 98m&m's, buy a set of JE slugs to fill the holes. Working great for me!

Randy Jones
1971 911

dbanazek · 12-11-2001, 06:40 PM

RLJ who did your bore and sleeve? Iron? What about boring and re-nikasiling? There is a company that does it for about $100 a pop. How high did you go on compression? I am considering a 3.3 race motor. Back to the original topic Norm I think you should go for a stock 3.2L. You can get the better fuel injection. At our junkyard we charge about $1500 more for a 3.2 than a similar 3.0. You should be able to sell your 3.0 and buy a 3.2 for the same difference, which would be much less than punching your 3.0 out.

hank911 · hank911's Garage

I've been thinking more displacment this winter too.Who does the cylinders for $100/each?I've already got the web20/21 cams and some intake work done to flow more gas along with ssi's.Using 3.2 Carrera cyl's do you have to stop @ 98mm or can you over-bore to 100mm without any other machining?J&E's would probably be my piston choice.Just got our first 8" of snow so the old "winter project" bug is keeping me up at nights!!What kind of projects,to keep SC's dominant do the rest of you have on the shelf????? hank911

emcon5 · emcon5's Garage

Factory 3.0 and 3.2 use the same size pistons. The 3.2 has a longer stroke for the greater displacemnt.

Yes, you can use the 98P&C with a 3.2 crank and get a 3.4l. I think going to 100mm P&C requires machining the case.

Search the archives, there are a few good posts about what you can do to tweak a 3.0 engine.

Tom

emcon5 · emcon5's Garage

Look here:

http://www.pelicanparts.com/cgi-bin/vb/showthread.php?s=&threadid=4620

http://www.pelicanparts.com/cgi-bin/vb/showthread.php?s=&threadid=33755

http://www.pelicanparts.com/cgi-bin/vb/showthread.php?s=&threadid=7061

Tom

JohnC · 12-12-2001, 05:11 AM

These folks replate cylinders for $100 ea. last time I checked www.usnicom.com

I think they also bore cylinders for an additional
$10-$20.

Don Wohlfarth · 12-12-2001, 06:37 AM

Last year my 82SC with 115K had 3 broken head studs. Never one to miss an opportunity to spend money I had my tech rebuild my motor with the Mahle 3.2 Moritz conversion. I already had SSI's and a 74 sport muffler.
The p&c's came from Andial ($3700), Raceware studs, reground cams (stock SC), rings, rod bearings, couple rockers, gaskets, yada, yada, turnkey $8200. Kept original CIS, stock ignition.
I remember when I added exhaust I could feel the difference. This motor gives more of a seat of the pants increase at all rpm's, mid range and top end is big improvement. Only downside is to my wallet.
Would I do it again? Only on Tuesdays and Thursdays. Mondays, Wednesdays, and Fridays, I would have put a 3.6 in it for something close to the same money.

Glasgow 911SC · Glasgow 911SC's Garage

Don,
What sort of performance (approx) do you get now? Hp, 1/4 mile, 0-60 etc.

Don Wohlfarth · 12-12-2001, 01:15 PM

Sorry, don't have those figures. Car is street only. This rebuild was because of 3 broken and studs and became one of those deals that while you're in there... Rebuild was completed Sep 00. At the time of the rebuild I thought I would have the car forever (had car 16 yrs). Bought a 93 RS America in Nov 00 that gets most of the street miles now (5K +/- yr). Just recently had the heads retorqued at 2k on the 3.2 rebuild.
Car is faster than a stock Carrera, maybe close to the RS. Don't know, can't drive them both at the same time. NO, don't need any volunteers.

I have a semi tube, all glass 914-6, with a 2.8 track car that takes most of my free time and satisfies my need for speed.
Very, very fortunate that I have a non car person wife that allows me all these toys.