Pulled the engine today 914-6 what now?, 2.5 L 20k Miles Aluminum case? Options

[burton73]

I decided that as my car was not running when I bought it that I was willing to rebuild it if the compression looked bad. This is what I came up with after putting oil in the plugholes and turned it over by hand. It turned very freely very easy. This car has been sitting for 16 years, as it did not pass smog for the PO. He said it ran great when last run. I pulled the Webbers that are in need of rebuild and you can see some carbon in the intake of the head a little so I am thinking vales.

The compression numbers where something like 120,60,80,60,40,70-I read that S cams give lower compression, but something is wrong as the numbers are all over the place. The one 120 may be OK

This is what the engine has according to the PO.
2.5 L 20k Miles Aluminum case 2.2. Rods EMPI, 88 mm pistons and cylinders, Ported heads and manifolds
40 IDS Weber Carbs, CD ignition, 911S Distributor 67 911S Cams

This would be my 3rd 911-engine build so I am not worried I just get help with the cam timing. I have bought a oil fed tensioner set I just do not know if I will need a full rebuild. Do you guys like this engine set up as far as the 2.5 and S cams?Ported, Perer Dawes of Dawes Motorsports built this engine in the late 70s.

Bob

[burton73]

The Webbers were off. This is the carbon in a head I am going to break it down to do a valve job at least. The question is to split the cases? I guess I will take it one thing at a time. Fun is good as a short drive is all it will get from me jamming in the city. . I had a 2.7 S with CIS in an 911 that was FAST. I just do not drive like I did when I was young. At 54 I am an old fart but I like to go fast from a stoplight or up the freeway for one ramp from my house to work.

Bob

[RSWannabe]

I love short stroke motors built on the 66mm cranks. They are SO much fun. 2.5 short stroke is a great configuration, especially done on an aluminum case. With some simple valve gear upgrades you can spin these motors past 8,000rpm safely and make great power. That being said, the motor you describe sounds like it might have been built as a race motor. You might want to check your port size. Its possible they have been opened up to a really large diameter, which would hurt your low RPM driveability and might make it not too much fun around town. Please post the numbers for the port size when you measure them.

I'm putting a 2.2S MFI motor into my six, but would love to have and aluminum case 2.5SS. Definitely worth the effort to get runnign right IMHO.

Brooke