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Engine Specific Info and Questions => IDI Engine => Topic started by: erice1984 on October 31, 2010, 10:01:24 am

Title: Compression Test Specifications for AAZ engine
Post by: erice1984 on October 31, 2010, 10:01:24 am

Was curious what Bentley says the compression tests should show for a normal engine and the wear limit.

Title: Re: Compression Test Specifications for AAZ engine
Post by: erice1984 on October 31, 2010, 11:22:01 am

Okay, I found a haynes manual and it states

Minimum: 279psi
Deviation: <20% from the highest reading

These are numbers from a US TDI motor.  I figured the compresion ratio is the same in both 1.9L TD and TDI so the sompression test specs would be the same.

Let me know if this is incorrect.

Title: Re: Compression Test Specifications for AAZ engine
Post by: Vincent Waldon on October 31, 2010, 11:56:50 am

The TDI is a very different engine design, so the specs are not transferable.

The AAZ specs (Bentley pg 15a-2) are:

new:  493 psi minimum
wear limit: 377 psi minimum
max difference between cylinders: 73 psi

Title: Re: Compression Test Specifications for AAZ engine
Post by: erice1984 on October 31, 2010, 04:51:22 pm

Thanks for clarifying Vincent