Valve Timing - 2.2 E?

bobswei · bobswei's Garage

I'm about to do the Valve timing on my 2.2E project car and want to make sure the specs before tightening down the 19mm nut. I have a book that says overlap for a 2.4E is 2.9 mm (2.7-3.1) but nothing about a 2.2. I'm guessing, same cams, same timing??
Anyone know for sure?
Thanks. Bob

2.7RACER · 07:30 PM

Hi Bob,
The 2.2L motor uses a different cam. The intake opens to 1mm at 29 degrees before top dead center, BTDC.
The 2.4L motor intake opens to 1mm at 18 degrees BTDC.

I haven't found the set up spec's in my references for your motor.

Since the 2.2L valves open 9 degrees sooner than the 2.4 the set up will be more than 2.9mm.

Perhaps someone has the setup info. If I run across it I'll repost.

SP2 · 05-11-2007, 08:43 PM

Doug, do you know if this is true of an 2.0L engine that was bumped out with 2.2 P/C's? Thanks.

2.7RACER · 09:55 PM

Hi James,
I get most of this info from Bruce Andersons "Porsche 911 Performance Handbook"
For instance a 2.0L '69E with MFI runs the same cam as the '70/'71 911E, 2.2L.
That is the intake opens at 29* BTDC, closes at 39* ABDC, for a total duration of 248 degrees. This as measured from 1mm open to 1mm closed.
A 2.0L '69S motor is hotter. the intake opens at 38* BTDC and closes at 50* ATDC, for 268 degree duration.
I would recommend Bruce Anderson's book, as well as Paul Frere's "Porsche 911 Story". In addition to Wayne's "101 Projects", each offers something just a little different.
Most of the early engines were timed with a degree wheel before using a dial indicator and going with the 1mm open spec.
If I don't have the timing spec's in mm's, I just use a degree wheel.
Since both cams perform well, I'd suspect the motor kept the cam that came with it. But, you really don't know without looking.

SP2 · 05-11-2007, 10:15 PM

Thanks Doug!

bobswei · bobswei's Garage

Doug, Thanks for the info and a wealth of info it is. I have one book that shows:

Type 2000 (901/01 901/05) up to engine no. 909927 = ideal 4.3

Type 2000 (901/06 901/07, 901/14 901/17) = ideal 3.15

Type 2000S (901/02 901/08) = ideal 5.2

Type 2000T (901/03 901/13) = ideal 2.5

This is all it shows but does say it is four "typical readings" so I narrowed down to what an E would be. Nothing about the difference between a 2.0, 2.2 to 2.4 liter.
I might know someone with a BA book so will try him.
Thanks, Doug for the info. Glad I didn't torque it down and slap the rest of the stuff on.

Bob
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2.7RACER · 05-12-2007, 10:33 PM

Hi Bob,
With the engine numbers we've got it.
901/01 and 901/05 use the E cams. This is the cam that opens to 1mm at 29* BTDC and closes at 39* ABDC for a 248 degree duration.
So that setup is 4.3mm.
901/06, 07, 14, and 17 use a milder lower hp cam. Opens at 20* BTDC and closes at 34* BDC, for a 234 degree duration.
This setup is 3.15mm.
901/02 and 08 is the hot S cam, opens at 38*BTDC, closes 50*ABDC, for a 268 degree duration. The setup is 5.2mm.
901/03 and 13 are the lowest hp of the bunch. The "T" engine. Opens at 15* BTDC, closes at 29* ABDC, for a 224 degree duration. Setup is the lowest at 2.5mm.
All this from matching the motor numbers with Bruce Anderson's published spec's in the "Porsche 911 Performnce Handbook"
It's the old story, some of the info is in all of the books. So you must have several books to get all the info.
Nice work, we got em all.

bobswei · bobswei's Garage

Wow! Doug.
Are you a math teacher. Nice calculations. I was lucky to figure out which one was the E.
Since my dial indicator is in inches, it's child's play to convert the MM's (at least this part is).
Thanks for your research and help. If your ever in the Sacramento area, I owe ya one.

Bob