911 T 1969, need more power.

[Micke]

Hi,
Some ides please,I bout a very original T 69 planing to lock over the engine
and like to have more power! in a good economic way? great full for advises.
Thanks
Micke
mail berg@narva.hu

[304065]

Micke,

There are literally dozens of threads here with questions about how to get more power from the 2,0 911T engine. The short answer is, the best thing to do is to buy an used 3,0 liter engine and adapt it to the car. The longer answer can be found by searching, but basically a 2,0 T has a non-counterweighted crankshaft, cast-iron cylinders, low duration and lift camshafts and a fairly weak crankcase compared to later years. As such, it is not a good platform from which to build performance.


Search here for more information.

[Grady Clay]

Micke,
First, welcome to the Forum
You will find a lot of help here.

Congratulations on your buying a ‘69T.
Coupe or Targa?
Pictures please.

Where are you located? Budapest?

Tell us more about your 911 and your intended use.
When considering ‘more power’ check your budget.
It will be a fun and satisfying project if it is budget-constrained.
It gets uncomfortable if you get half-way and at the budget limit.

That said, John is giving you good advice above.
Start with another engine.

This has several advantages: you can continuing driving while you build an exchange engine at your leisure.
This also allows you to source all the ‘right’ parts at the best cost. Being in a hurry costs more.

The 3.0SC is the easiest solution. You can even use your exhaust, carburetors, clutch (sorta), fan shroud, wiring, etc. on a stock 911 SC engine. This makes installation easy and the engine will appear (close) original.

A 3.0 is at the limit (perhaps above) for your type 901 transmission. Many doing this conversion install a type 915 transmission.

A 2.7 is more suitable for your transmission and is a lighter weight engine. The difficulty is finding a good, properly rebuilt engine. Of course the ‘ideal’ is the type 911/83 from the ’73 Carrera RS 2.7
Big bucks but great fun.


You also need to consider the rest of the car.
More power can need improved brakes, suspension, tires, etc.

You will find all the answers (and more) here.

Best,
Grady

PS: You can have the Moderator move this to the 911 Technical Forum. You will get more responses there.
G.

[Henry Schmidt]

Originally Posted by Micke

Hi,
Some ides please,I bout a very original T 69 planing to lock over the engine
and like to have more power! in a good economic way? great full for advises.
Thanks
Micke
mail berg@narva.hu

I recently did the exact same thing.
I had a 69 911 T with matching numbers and wanted the most drivable engine but still wanted to retain the original engine.
I elected to build a 2.45 (70.4X 86). This is done by changing from the short stroke 66mm (2.0-2.2) non counter weighted crank to a 70.4 (2.4/2.7) counter weighted crank. Of course the rods are changed to match the crank.
The 86mm Ps & Cs are a biral cylinder (AA Performance) with a JE forged piston.
I chose a 9.5:1 compression ratio and a DC 40 (Mod "S") cam.
We ported the heads to 36mm and used Weber 40 mm carbs.
We added twin plug for the wow appeal but at 9.5:1 twin plugging is not necessary.
The engine produced good low end and 180 RWHP @6500 with more on tap as the engine breaks in.
The best thing about this configuration is that the cylinders slip in and the over all project is more or less a straight forward rebuild.

[JmuRiz]

Really a twin plug isn't needed on a 9.5:1 ratio? I'm sure it helps though, right?
Sweet 2.45!

Pardon the question, I'm new to 911 engines.