RYAN91S2

Could someone tell me what the cylinder pressure (compression tester) and the fuel pressure should be on my 91 S2. Thanks

Michael Stephenson

Here are the cryptic answers to your questions:

Fuel Pressure:
From the 944S2 1989 Information Technik (WKD 496 021) p. 0-05:
Fuel System Pressure without Vacuum: 3.6 – 4.0 bar

Cylinder Compression:
From the Manual Vol. 1A 10-0103:
Compression New: 8 bar and above
Compression Wear Limit: 6.5 bar

(I am not real sure how this info. translates to good ol’ American standards.)

Michael Stephenson

According to my handy-dandy book of conversion tables I was able to find out the following:

1 Bar = 14.5038 psi

Fuel Pressure:
3.6 bar = 52.21 psi
4 bar = 58.0 psi

Cylinder Preassure:
8 bar = 116.03 psi
6.5 bar = 94.28 psi

RYAN91S2

Thanks for the info Michael, and I appreciate you going through the trouble of converting it for me.

Hans

Michael
To add to the confusion: my manual copy says: compression ratio: 10.9 to 1 (section 1A, general info, page 0.10)
This means that the compression end pressure when new should be 10.9 x 14.5 = 158 PSI
The figures on page 0103 might fit the turbo version very well, but seem too low for the NA.
Manual faulty?
TakeCare