What's the purpose of this tube?

2.7 CIS Motor
Click to view attachment

Look like air injection into the head for emission control

The dreaded 2.7 thermal motor.

probably pinched off years ago if the air pump is gone.
remove and plug at each head.

10x1 if I recall. The cap we use for the back of the 914 caliper is perfect for this.

Ugh. Ask Ferg how much fun that project can be. Buy some dental tools........

Thanks! From the comments, sounds like a motor to stay away from for a conversion?

There are definitely better - but I am using using a 2.7 for my conversion. The price was right and thankfully all of the 2.7 stuff that needed to be addressed was done by the previous owner (less a couple of exhaust studs!!). Here is pic - I am just a clutch and a set of 914-6 engine tins away from installing it in the car. Hoping for a fun summer!

Ooooo, those clear f-glass tins are cool!
You're much further along with your 2.7 than I am.

Depends. Buy it right.

those tubes that go into the head are super thin, as in hollow, anything more than a "tiny" effort to remove them will result in them snapping leaving threads in the head, I had 3 of 6 snap, 2 of those came out with a reverse bit the last one was hell, dental picks and all.

If you do decide to use that motor there are plugs for those air-injection ports. Engine Builder's Supply used to have 'em but they were available from lots of folks.

I had a really nice 2.7L (Bruce Anderson spec) motor in my 914 when I bought it. It was great fun and built to overcome the limitations of the original. But it'll never have the legs (mileage) that a later motor will. I'd never put less than a 3.2L motor in one now unless a really fun 2.7 cropped up. Any more I'm used to having more torque. Kinda makes going back a bit tough.

To build a 2.7L motor up properly will cost as much or more than a later motor, although the conversion costs differ a little. The magnesium case has to align-bored (and possibly shaved first) and after oil pump updates and other mods you will still get a motor that can't last as long as a newer one. For some years shuffle-pinning was recommended for those cases until it was discovered that there wasn't enough of a "boss" (material surrounding the pin) to keep lots of the cases from cracking at the pin.

All of this said though, the sound of a 2.7 and smaller motor through a sport exhaust or megaphones is impossible to duplicate with a larger motor. I miss it.
Good luck

The 2.7 is a fun and cheap motor. I got one, rebuilt it, did not throw the expensive upgrades into it: newer oil pump, oil fed chain tensioners. The upgrades are better, but not necessary. I got a 74, so no thermal reactor BS to deal with. The 74 is a healthy engine to start with. I rebuilt my engine for less than $3k buy educating myself and seeking out experience vs regurgitated hearsay. Another good thing about a 2.7 is that you do not need an oil cooler. It is the biggest you can go without needing one.

I think I'm going with a 2.4 at this point instead of this one that Ron's hooking me up with...

I always thought that until about 3.0 you were still safe?