2.2 T engine mild upgrade
 

Hello,

We bought in january a 2.2 T in very nice condition.

http://motors.aquiweb.com/albums/911t/adt.jpg

The engine runs beautifully without any problem but is in "used condition". We bought an other 2.2 T engine (code 911-07) that is also in "used condition" and we are planning to rebuild it to new.

http://motors.aquiweb.com/albums/911t/ade.sized.jpg

So, as the cost to rebuild a 911 engine is pretty similar to rebuild a S or a T engine, we are looking about a mild upgrade of the 2.2 T. The first step we think about is about pistons (may be E or S type) to increase Compr. Ratio but may be other things can be done (I think about carbs and/or flow-bench heads...)

We will be happy to have other suggestions or may be a complete upgrade configuration... We have Zenith carbs and 40 IDA carbs both.

any suggestion welcome

E cams probably make the most sense for street use. Valves are same size and I believe ports are same for Ts and Es with Ss a little larger. IMO bigger ports wont help on the street. Ts have slightly less compression ratio so E cams will probably net 140/145 hp or so. That’s assuming recurving the distributor to e-specs, some jetting for the carbs, and a good valve job. Use the Webers, Zeniths are OK for stock but hard to hotrod. If you don’t have one get a bosh distributor, use E advance springs and E rotor. Parts for Marellis are stupid expensive or unattainable. Not much else can be done without new Ps&Cs and lots of $$$$.
E cam profiles on your T cams about $900, vale job $1,200 to $1,600, Bosh distributor (w/parts and recurve) $400+, engine rebuild kit $400-$500, endless odds and ends $2K+, labor $3K-$4K. No mater what else you do get some books on 911s i.e. 101 Projects, 911 Rebuild.
Ts make nice around town and road cars. Also, lots of fun for Auto-X and some DEs. Why not spend the money on suspension renewal/upgrades, “good tyres”, period correct wheels and some “driving events”(keep the cookie cutters, introduced in ‘74 for track tyres).

Oh yeah, real nice car!

I'd double check that there is enough clearance between the T pistons and the valves with E cams. If it were me I'd keep the same cylinders and get some E or S pistons style too. Using E cams with T pistons will actually net you a lower functional compression ratio.

BTW -- What happened to your face??? It's melted!

Hi all,

The person on the picture is my wife :D

David, I think your prices are a little bit expensive. For the E cams, Dougherty Racing Cams offers them around $300 and if rebuilding 6 heads costs $1200-$1500 I will probably a machine shop next !

BTW, our engine needs to be rebuilt, it does not have its entire power. It is the reason why we are thinking about an upgrade.

jluetjen, sure I will look for E or S pistons.

I'd install a 2.4 crank and rods, replace the marelli, and call it a day. Of course replace/rebuild anything else out of spec.

The next step would be E cams, then maybe 2.2E or S pistons. But a bone stock 2.2T with a 2.4 crank/rods makes a pretty sweet street engine.

Interesting point of view... getting HP simply with the displacement.

Are all 2.4 cranks similar ? counterweighted or not ?

The 2.4T, E and S cranks are all counter weighted.

You'll have a 2.4T with 2.4S compression. Very nice street engine Definitely the most bang for the buck.

$300 for both is a very good price; each would be what some others charge like Web Cams. $900 was for planning as most locals charge more. Porsche started using fully counter balanced, steel cranks in all 2.4s in late ‘72. New P&Cs and 2.4 crank = lots of $$$$, why not sell one of the 2.2s and just buy a 2.4. Complete engines are often much less than their separate parts? I got an early ‘73 MFI 2.4 (not running) last year, wrapped in a 911 sunroof coupe, S brakes, S bumper, horn grill mounted fogs, original sport seats for $2k.
2.4Ts had 130hp with 7.5cr, 140hp with MFI. Ss came with 8.5, same as 2.2 Ts! 2.2 T pistons in a 2.4 with E-cams = some where in the 175hp range. As previously observed this would make a real nice streetcar, running regular gas. Add a set of 2.2 S pistons and you are in the S hp range only 300 rpm sooner. Better low end torque too.
If you rebuild your own motor you should read a lot of how-to-books, most of which will tell you to check valve to piston clearance, upgrade to pressure tensioners and turbo valve covers, use different studs etc. etc.

You have a real problem. Its cheeper to ditch the T than to upgrade it significantly in my humble opinion. To many significant differences between a T and the E or S engine. The differences are as follows:
Pistons, cylinders, rods, crank, cams, oil squirters, minor porting, oil cooler just off the top of my head. It would be cheeper to find something nicer and sell the T engine as is.

If you do upgrade the T, you will put in more money than its worth and in the end it will still be a T engine.

If the car is for street use only then I think the T cam is the best choice given the 2.2L displacement.

Don't even think about porting. 32mm ports are plenty large for a 2.2 street motor. You could use them all the way up to 2.7L if you wanted.

I think Brians' idea is the best improvement for your particular motor. You can find these 2.4 cranks every now and then on ebay for around $250. The increased stroke will increase your compression ratio by about .5 points as well as increase displacement.

But really, a 2.2 is not the best starting point if you want more performance. It's cheaper to just buy a bigger motor.

By the way. That's a very nice car. Hang on to your original motor. The market on these cars is really heating up and the original cars bring the most money.

Thank you for all your responses.
The 2.4 crank and rods are an interesting suggestion. And it is counterweighted.

The idea is not to build a race engine. Just to optimize a rebuild job.

I sort of did what BK911 said. I started with a 2.4L T, and put in 2.2L T p/c's. That yielded me a little higher compression. I have a slight advantage over a pre-'72 since I have MFI.