How can I verify the piston size and cam?, 2.2l 6cyl Options

[tornik550]

I recently purchased and received a 1970 2.2l 911e engine that I purchased from someone on this website. The engine looks very very nice. The engine is in working condition and has good compression and leakdown. It has zenith carbs which are obviously not stock. Although the previous owner believes that it has stock pistons and cams, we are not certain. Is there an easy way to verify this? I have the engine out of the car. I am soon going to be removing the valve covers and cam tower covers so if there is an easy way to figure things out- I probably should now.

[r_towle]

Cams are simple enough to measure.
Pistons, remove a head, sorry to say

[tornik550]

Cams are simple enough to measure.
Pistons, remove a head, sorry to say

I will measure the lift when I take off the valve covers. Can anyone point me to a reference that has the cam lift numbers and such for early 911 engines.

How difficult is it to remove a head and reinstall the head on this engine? The engine is out of the car.

[Mark Henry]

Sounds like DWD is kicking in.... (IMG:style_emoticons/default/blink.gif)

Going to cost money to remove a head, I'd get a inspection camera from HF and look at the piston top. CR could be volume measured if on a stand.
Most aftermarket cams are stamped behind the back journal, so you would need to remove a cam. IIRC you can read the part number on the cam, but if it's been reworked the number is useless.
Wayne's book has many of the numbers listed.

[tornik550]

Sounds like DWD is kicking in.... (IMG:style_emoticons/default/blink.gif)

Going to cost money to remove a head, I'd get a inspection camera from HF and look at the piston top. CR could be volume measured if on a stand.
Most aftermarket cams are stamped behind the back journal, so you would need to remove a cam. IIRC you can read the part number on the cam, but if it's been reworked the number is useless.
Wayne's book has many of the numbers listed.

What does DWD mean?

Also, I do have an inspection camera. What would I be looking for? I cant really measure the diameter with the inspection camera.

I really don't mind spending the money to remove the head. I just don't want to put a huge amount of time into it. Is removing the head and reinstalling it easy? What would I have to buy and replace if I remove a head.

[mskala]

Wayne's book lists things a bit differently. This is a list I had
lying around of popular early stuff:

CODE

       duration 1mm   duration 0.050"    lift     lobe sep angle   lift@overlap
911E      238/226        230/222      .405/.393        102         3.0 - 3.3 mm
solex     248/236        242/230      .455/.414         97         4.2 - 4.6
911S      268/240        263/235      .455/.399         98         5.0 - 5.4
906       290/262        283/255      .463/.460         96         6.8
DC-30     248/236        242/230      .455/.414        102         3.6 - 3.8 (written on box)

[Mark Henry]

Sounds like DWD is kicking in.... (IMG:style_emoticons/default/blink.gif)

Going to cost money to remove a head, I'd get a inspection camera from HF and look at the piston top. CR could be volume measured if on a stand.
Most aftermarket cams are stamped behind the back journal, so you would need to remove a cam. IIRC you can read the part number on the cam, but if it's been reworked the number is useless.
Wayne's book has many of the numbers listed.

What does DWD mean?

Also, I do have an inspection camera. What would I be looking for? I cant really measure the diameter with the inspection camera.

I really don't mind spending the money to remove the head. I just don't want to put a huge amount of time into it. Is removing the head and reinstalling it easy? What would I have to buy and replace if I remove a head.

DWD is a old 914 in-joke, Dirk Wright Disease, Dirk was a member from the Rennlist days. He was just suppose to take a couple things off and do some minor repairs, the further he got in the further the car came apart, till it was all apart. He got obsessed with having the perfect 914.
It was never known if he got it back together and most who know the story assume it didn't.

[SLITS]

The disassembly and reassembly of the 911 engine is not just bolt together. In lieu of a shop doing it, get Wayne Dempsey's book on the 911 engine and read it before attempting removal of any of the parts except for valve covers.

[Cap'n Krusty]

Uhhhh. You could just read the camshaft numbers off the cams. That might be too easy, though, for those of you who have a need to do things the most complicated way possible.

The Cap'n

[tornik550]

Uhhhh. You could just read the camshaft numbers off the cams. That might be too easy, though, for those of you who have a need to do things the most complicated way possible.

The Cap'n

Where do I find the numbers on the cam? Can I read the numbers without removing the cam?

[johnhora]

here are the piston numbers

[Mark Henry]

Uhhhh. You could just read the camshaft numbers off the cams. That might be too easy, though, for those of you who have a need to do things the most complicated way possible.

The Cap'n

I already said that (IMG:style_emoticons/default/rolleyes.gif)

The number is along the side of the shaft, you should be able to see it if you take the covers off.

But like I said if the cam profile has been reground the number could be wrong.
My cams are stock core so they would have a stock number, but they have been hard-welded and reground to a performance grind by Webcam. The new number is stamped on the backend.

[BK911]

Good luck reading them off the cam.
I have never been able to.
In fact, I am looking at a 2.2s engine now and can only read 901 105 on the left cam.
Nothing on the right.

[tornik550]

I just looked at the Pistons with a scope. It looks like there are pockets for both cylinders. The only identifying fester that I saw was some strange bump in the center of the piston. It looks like it is about 1cm large. Does that help identify the Pistons?

[tornik550]

Not sure if this helps but this is a picture of the exhaust valve pocket and the bump in the center of the piston.

[tornik550]

I will try and get more and better pictures tonight.

[tornik550]

Does anybody have a reference which shows what the different Pistons look like for the different 1970 911's?

[SirAndy]

Not sure if this helps but this is a picture of the exhaust valve pocket and the bump in the center of the piston.

Like this? (IMG:style_emoticons/default/idea.gif)

(IMG:http://www.914world.com/bbs2/uploads_offsite/www.pelicanparts.com-179-1417828295.1.jpg)


Got the pic from here:
http://www.pelicanparts.com/cgi-bin/wizard..._engine_rebuild

[bigkensteele]

Not sure if this helps but this is a picture of the exhaust valve pocket and the bump in the center of the piston.

Like this? (IMG:style_emoticons/default/idea.gif)

(IMG:http://www.914world.com/bbs2/uploads_offsite/www.pelicanparts.com-179-1417828295.1.jpg)


Got the pic from here:
http://www.pelicanparts.com/cgi-bin/wizard..._engine_rebuild

That looks like a CIS piston. I don't think that any of those had valve reliefs, just the swirl like bump.

[jcd914]

That looks like a CIS piston and his 2.2 pistons would look different.

If the engine was a 2.0 and was upgraded to 2.2 then there may be an external visual indication.
The 2.0 engines had a head gasket that can be seen from below (not easy if I recall correctly) and if stock Porsche 2.2 P&C were used there would be no more head gasket to be seen.

Jim


2.0 911 head gasket: