1970 1.1 Engine #s Question

[JackJ]

The 1.1 engine I removed from the 1970 parts sedan has the serial # starting as 11RUS. I know this is not an "SR" engine but is it just a run of the mill 1.1 engine. It has the dual carbs which is stock also.Thanks for any info.

[greensmurf20]

if the dual carbs were origional to that engine, it would suggest it is in fact a SR engine. what kind of car did you pull this out of? from my understandings, the standard 1.1 liter engines only had a single carb, and only the SR engines received dual carbs.

[JackJ]

The car was a 1970 Kadett model 31 sedan.Everything is OEM including an a single oval air filter assembily which covers both carbs.The car was purchased off a 90 year old man who claims to be the original owner.The linkage,carbs,ect are factory(Nothing jury rigged).Also the filter is a mesh screen attached to the top cover and must be washed out(not replaceable).This year actually calls for dual carbs as standard from what I can tell.

[69grngt]

I had the same type of situation with my 69 gt. Broke a piston ring and scored the wall so bad I ordered a short block from the local Buick dealer. When the block came in it was a 'US' and not an 'SR'. Tried to exchange it for the proper sb but was told the "US' version was the only one available.
Something simular may have happened to your car.
Roger

[GTJIM]

Emissions .....
The engines for US of A were carefully specified to meet the new emission standards being introduced there. That is why the replacement shortblocks from Buick dealers had "US" in the engine number.
Elsewhere there was the base 1.1 motor with a single carb the 1.1S motor with higher compression and the 1.1SR motor withmore compresion and twin SBD Solex carbs. It seems that the 1.1S and the 1.1RUS motors could be fitted with the twin carbs also - the motors in the 1100 GTs were certainly fitted with twin carbs as standard.
S = Sports SR = Sports Rallye

[apassens]

I found something in the 69 handbook.

They list three different engine versions:
1.1 US (A.I.R) 8.2:1 comp.ratio - requires regular fuel
1.1 R (O.E.C.S) 8.2:1 comp. ratio - requires premium fuel
1.1 SR (O.E.C.S) 9.2:1 comp.ratio - requires premium fuel

O.E.C.S stands for Opel Emission Control System = a more accurate metering and better distribution through two carburetors, a unit mounted in the center of the intake manifold and a computer between the ignition coil and solenoid valve.
This is put in place to achieve a richer fuel mixture over 1800 rpm for less misfiring and reduction of consequent hydrocarbon emissions.
(see handbook 64-4).

So its the standard engine with different fuel supply and the smallest "computerized" Kadett - I think.

[JackJ]

The engine did not have the air pump nor does it have a double groove pulley on the water pump(just a single groove) or on the crank for such a pump. When the motor comes apart I will let you know what pistons were inside(hopefully).I plan on putting slightly oversized nos new"Mahle" SR pistons in if the bores are wrecked(donated by my dad to me).Anyway I will post full serial # of engine later and part #s on the pieces..Thanks!

[tekenaar]

Originally Posted by JackJ The 1.1 engine I removed from the 1970 parts sedan has the serial # starting as 11RUS. I know this is not an "SR" engine but is it just a run of the mill 1.1 engine. It has the dual carbs which is stock also.Thanks for any info.

Originally Posted by apassens I found something in the 69 handbook. They list three different engine versions: 1.1 US (A.I.R) 8.2:1 comp.ratio - requires regular fuel 1.1 R (O.E.C.S) 8.2:1 comp. ratio - requires premium fuel 1.1 SR (O.E.C.S) 9.2:1 comp.ratio - requires premium fuel O.E.C.S stands for Opel Emission Control System = a more accurate metering and better distribution through two carburetors, a unit mounted in the center of the intake manifold and a computer between the ignition coil and solenoid valve. This is put in place to achieve a richer fuel mixture over 1800 rpm for less misfiring and reduction of consequent hydrocarbon emissions. (see handbook 64-4). So its the standard engine with different fuel supply and the smallest "computerized" Kadett - I think.

That would be it . . . carbs and manifold look like this, right?

This 1.1R OECS (carb mixture control computer) engine was offered for three years, '69-'72, in the Kadetts and for just the first two of those years in the GT. The compression ratio was lowered from 8.2:1 to 7.6:1 in 1971 for emission control which resulted in lower HP and Lb/ft output. Other than this, the engines are identical.