Help me identify my cylinders (from poor pictures)

[tornik550]

I recently obtained a new engine that was reported to be a 1970 2.2l e. Unfortunately, I do not know a lot of details about the engine other than that the compression and leak down is good (I forget the exact numbers now). I was also told that the previous previous owner "had some work done". That is all that I know. The case is a 1970 2.2l e engine. The engine is obviously not completely stock because it has zenith carbs and not MFI. In an effort to properly tune the engine, I am trying to figure out what type of pistons and cam that I have without removing the cam or cylinder heads.

I tried to look at the tops of the pistons with an inspection camera through the spark plug holes. I know that the pictures are very poor however I was not able to get better pictures. I can see that there is a pocket cut out for the exhaust valve (picture 1). I cannot see if there is an intake valve pocket. I also noticed a strange bump on the center of each cylinder. It appears to be about 1 cm in diameter. It also appears that the pistons are domed to some extent.




Any ideas what kind/size of pistons these might be? I have been having a difficult time finding pictures of stock 2.2 e pistons.

[tornik550]

this is a picture that I found on this website. the bump in the center looks exactly the same as my pistons however the rest doesn't look the same.

[Steve@Rennsport]

Those look like CIS pistons to me, but I cannot be certain without better pics.

[tom1394racing]

Take a look at the external cylinder fins. If they are rusted and magnetic, then you likely have cast iron cylinders that were used on the T engines. If they are non-magnetic, you likely have Biral cylinders used on the E & S engines or possibly the later 2.7 aluminum cylinders.

What you are calling a valve pocket on the piston dome looks more like the type of mark that results from the piston hitting a valve during an over-rev. The little button-like impression in the center of the dome looks like the casting mark seen only on CIS pistons.

If you have cast iron cylinders, my bet would be that you have 2.4 CIS pistons. If you have aluminum cylinder fins, I would guess the engine has 2,7 CIS pistons and cylinders.

Photos of the cylinders fins and cylinder bases where they mate to the case will help to narrow things down.

[tornik550]

Here is a picture of the jugs and where they join the case.

[tom1394racing]

Looks like a 2.7 Cylinder to me. Here is an example of one from a bottom view like your picture



A matching 2.7 CIS piston without a valve impression would look like this:



If your engine were built with CIS pistons but not the CIS cams, your risk of piston to valve collision is much higher

[tornik550]

Your assessment makes a lot of sense. So is changing from 2.2l e p&c to 2.7 p&c common? I am still trying to figure out what kind of camshaft I have.

As far as the valve strikes go- what else to I need to look out for? I did have conpression checked and leak down and everything was reportedly ok. I forget but conpression was about 150 +/-5 per cylinder. I don't remember the leak down numbers but they were reported as normal.

[tornik550]

Another interesting thing is that I just went and checked the engine again. I vaguely saw a mark at approx the 4o'clock position that looked like a number 2.
Also, I wanted to check the crankshaft stroke length. I know that my method is not perfectly accurate however I put an old vw pushrod in the spark plug hole and measured the furthest out and I the pushrod went. I measured 2.77" (70.358mm). Considering that my measuring technique is not perfect, I feel that would be consistent with a 2.7l crankshaft so it appears that they switched the crankshaft, pistons and cylinders. I am still working on figuring out the camshaft.

[tornik550]

With a scope I was able to make out the numbers on the 1,2,3 bank camshaft. It looked like it said 901051810R. From my understanding, a 1970 2.2e would have a camshaft with the number 90110518100. It definitely looks like an R. Any insight on this?

[tom1394racing]

It sounds like the engine was made into a 2.7 by boring the case spigots to accept the 90 mm cylinders. The crank must be the 2.4/2.7 unit. It seems as though the cams were not changed in the process.

CIS pistons usually interfere with the higher lift, longer duration cams like the E cams unless the pistons are machined with valve pockets. The impression you see in the piston dome could have been machined in to allow the use of E cams with CIS pistons.

What type of intake system was on the engine?

[tornik550]

The engine came to me with zenith carbs and stock venturis.
What is the lift on the 2.7l cam?