911 engine type 911/51?

[dfleming88]

Hi to all!
I'm thinking of buying 69 911 , But want to know what I'm buying!

Vin # 119310201
engine #6123203
engine type 911/51
What is engine type # for anyway?
Thanks for all your help

[Shuie]

911/51 is a 2.4 MFI T engine from a '72 or '73 car

[ttweed]

The Type # identifies what was in the case when it left the factory. On a '69, there is a chance it was rebuilt by now, so things can be changed internally, but it started life as a 2.4 liter 1972 911T engine (140HP). That would not be a matching engine for the '69 chassis. Does it have carbs or MFI?

I believe the chassis number indicates it is a 1969 911S, so it should have a Type 901/10 engine.

TT

[dfleming88]

The current engine does have carbs.
What are the chances of finding a 901/10 engine?
Is the current 2.4 a good engine?

[ttweed]

Originally posted by dfleming88
The current engine does have carbs.

Then someone did a "mix-and-match" rebuild/swap on it at some point in the past. Not necessarily a bad thing, but not original equipment, which reduces the value of an early S model.

What are the chances of finding a 901/10 engine?

It can be done, but at a price, in both time and money. You need to consider what your goals are with the car in relation to the cost. Nobody can answer that question but you.

Is the current 2.4 a good engine?

Yes, if it is in good internal condition (compression/leakdown) and tuned well, it could be a great driver. The original S motor was more powerful, but a T has good low-end torque and can be very driveable. It is definitely as much as you need for normal street/highway purposes in an early, light chassis. Needing and wanting are two different things, though, and I always seem to want more power.

YMMV,
TT

[jstobo]

You can convert the T motor to S spec with 2.4 S pistons and an S spec camshaft. Parts will probabaly be between $1500-$2000 Depends if you use aftermarket pistons such as JE or original Mahle. Then you will have a 190HP DIN or 210HP SAE rated engine and one of the best power weight combinations ever built. Your 69 chassis is the same as a 72. If you go with E cams you lose about 25HP but gain city drivability. Good Luck!

[911SCfanatic]

jstobo, my understanding is that more is required to get S-spec power out of a T motor. The port sizes in S heads are quite a bit larger providing greater flow. This is what I've found so far since I'm considering the same upgrade.

What I'd like to hear is what is the power difference between 1) a T motor with S cams and pistons, and 2) a T motor with S cams and pistons *and* S heads or ported T heads. Also, what is the cost for good used S heads or the cost to port T heads to S-spec? Another question--what is the difference between the 2.4S pistons and the 2.2 pistons? I've heard some comment that you can use the 2.2 pistons and accomplish the same thing.

[ttweed]

Originally posted by 911SCfanatic
jstobo, my understanding is that more is required to get S-spec power out of a T motor. The port sizes in S heads are quite a bit larger providing greater flow.

This is correct, and beside that, you would need the MFI for an "S" to truly be in factory spec, although the carbs would work if reconfigured w/ larger venturis and jetting.

BTW, jstobo, 190 DIN = 193 SAE HP, not 210. The '73 RS had 210 DIN, but it was 2.7 liters.

TT