more power from my 2.2t when rebuilding!

[70_911t]

I want some more power from my engine. I know the 70 2.2t puts out around 120 or so, which is not much at all. Any Ideas? I would really like something around 160 or so..

[Steve@Rennsport]

Whats your budget?

[304065]

As Steve says, it's very difficult to improve the performance of the 911T motors inexpensively. You have the following issues:

Small ports in heads
Zenith Carburetors with small venturis
Low compression pistons
Non-counterweighted crankshaft (not a huge bottleneck but can be an issue with bearing life)
Cast-iron cylinders
911T camshafts
Marelli distributor

Along with the performance increase you may want to consider upgraded oil cooling, although 160 hp is about the limit that the factory used for the engine cooler only.

If I were you, I would search this forum extensively, there are probably a hundred threads where people with 911T motors sought the advice of the community on how to increase performance. In short:

Port heads
New pistons and cylinders with higher compression, say 9,5 to 1
Modify Zeniths, which is harder to do, or use PMO carburetors (great solution)
Mod-Solex cams
Bosch distributor

Couple that will all the standard engine rebuilding stuff, e.g.:
piston squirters
oil bypass modification
align bore and case-savers for your magnesium 2R case
intermediate shaft bearings and updated intermediate shaft
updated chain tensioners, timing chains, sprockets if necessary, modern idler arms
regrind and rebush rockers to go with the new cams
recondition connecting rods with new small end bushings and resize big end
new connecting rod bolts
recondition crankshaft if necessary or replace with 66mm counterweighted crank (optional)

I would say that all of the above, accomplished by competent professionals, would leave you with little change from a $20,000 bill.

[BK911]

2.4 crank and rods will put you around 150-ish.
E cams will bump it up a little more.

[70_911t]

I dont know the exact budget yet. How about higher comp pistons and cylinders. They sell kits from JE.

Also what is this i hear about a short stroke 2.8?
So bottom line, if i put a 2.4 or 2.7 crank, 2.4 rods, E cams I would have a decent gain?

I am also currently in the process of removing my sportomatic and installing a 5 speed 901. And helpful hints on all parts needed? I have trans,shift rod and pedals.
Still need pedal bracket (i think), clutch, flywheel, shifter assmbly.. Any other things needed.

[Walt Fricke]

I hate to say this, but if you want a car with significantly more power, the least expensive approach is to sell what you have and buy an SC.

Lacking that, buy a used 3.0. You will pick up 80 HP (if you put your headers on the SC) right there. You'd need to purchase a flywheel to adapt the SC's 9 bolt crank to something which will work with a 901.

Or a used 2.7 - even less expensive. Just get one whose head studs hold torque. You can bolt your flywheel right onto that.

Or take BK911s route.

You really should start out by purchasing the book on 911 Engine Rebuilding Wayne (our host here at Pelican) wrote. Not only will you need it when you get to building or rebuilding, but he also has a good discussion of the pros and cons of this versus that versus the other thing when hot rodding 911s. For instance, you would learn you can't make a short stroke 2.8 with the case you have.

Then you could ask more focused questions.

[jpnovak]

I think John, Brian and Walt all have good ideas. Your choice will depend on what you use the car for.

For a street car, the engine swap (2.7 or 3.0) represents good value. Use your early exhaust and carbs and you will have good fun. Both of these (originally) CIS type engines will produce much low-end torque and loose that acceleration feeling as the revs climb.

For a canyon carver, backroad bomber or AX/DE car I would build an early engine with a modern cam grind to give you the high-rpm character. The options here are nearly endless.

As far as adding more performance to your existing engine, This may become cost prohibitive when you look at all the things that need to be updated. John provided an excellent summary.