Help identify my engine parts R/S Carrera stuff ?

[pjv911]

I just bought a 1975 euro 911 which appears to be a euro carrera R/S.
Unfortunely at some time someone decided to convert it to a steel widebody car. Its been sitting outside for over a year uncovered and took on some rain water which entered cyl #6 and froze. This resulted in a cracked cylinder and head.
Today I removed the engine and tore it down. Aside from the #6 cylinder and #6 cyl head everything looks great. The previous owner said the engine has less than 500 miles used since a full rebuild. I can confirm this by the new pistons and cylinders. As well as the freshly built heads and fresh cut flywheel among many other things.
Anyways he said the engine has race cams. Well aside from saying he got them from performace products thats all the info he had. Oh yea the engine was built 4 years ago.

The heads are all part # 911.104.307.1R and dated in 1974. They have the factory cut threaded mfi injector holes on the intake ports so im guessing they are euro 2.7 r/s carrera heads. The casting # appers to be the same as the 2.4s heads but those would have earlier date codes.
The ports sizes are 36mm intake and 35mm exhaust. The valves are 45mm intake and 35mm exhaust. Can anyone confirm what heads these are ? And would a 2.4 s head make a good replacement once flycut for 90mm jugs ?

The MFI injection appears to be Carrera R/S as well. The injection pump is dated 3/73 and is part # 0408-126-019 . The stacks are part # 911.110.312.1r and the bore size is huge compared to my 72t stacks. The throttle bodys have no part #s that I can see but the bore diameter is 35.8mm or 36mm without the gasket crap and after a good cleaning.

The connecting rods are part # 911.103.105.OR . I believe these are the same rods used on all 2.4/2.7 engine but not sure.

The pistons are high dome hemi shaped and are most certainly standard replacement 90mm r/s types. Also as far as the jugs go are these the same ones used on the normal CIS engines ? Im aware of different height groups. Can I replace a bad r/s cylinder with a standard cis cylinder ? I have quite a few of these in the correct (6) height group.

The cams are a mystery to me. I have only taken down the one side of the engine so I have only 1 cam part # to offer. It is 901.105.110.1R . Of course they could be regrinds so that may not help. However the nose of the cam has 9.01 on the top and 168.0 on the bottom. The nose im reffering to is the part you see when you pull the timing chain cover off and look at the cam. The back side of the cam (front when installed) has a vaguely stamped S surrounded by a triangle that shaped kinda like a wankel rotor. Also the heel of the lobes are pretty close to flush with the camshaft casting(maybe .020") and the toe is nearly as high as the bearing surface(maybe .040" shorter). In short it doesnt appear theres much room to have more lift in the profile. To the eye the lobes are much more aggressive looking compared to a 1977 911s cam I had to compare it to.


Lastly acording to the red book the engine case appears to be a standard euro 2.7 case and not the desireable 911/83 case. It is a 911/81 and has a vin # 6361543. Is this anything special ?

I know this is a long post so I really do appreiciate anyone who will take the time to offer some help.

Im currently seeking a head and piston so I can reassemble this thing. So fast advise my aid my direction with this engine.


Kurt Williams

[Wayne 962]

That case is a 1976 Euro 911 (not 911S) engine case. Nothing super special there...

The 911RS engine used S cams. Other than the 2.7 MFI injection, there's nothing terribly special about the bottom end except for the serial number on the case...

-Wayne

[pjv911]

Any help with my question on the cylinder head ? Also is the cylinder compatable with the cis type ?

[2.7RACER]

Cam is a right side '69 E-cam, if I interpret the PET correctly.