Compression test

1. user_29044 Established Member Joined: Dec 2008 Croydon bruvaaaaaa Posts: 1448 Alfa Romeo Mito Cloverleaf & Saxo VT?

   #1 8th November 2010, 20:34

   Hi all,
   
   I am currently writing a report for uni on a compression test i carried out on a 1.1 106 (black top engine).
   
   I was just wondering if someone could explain to me in detail the result i got.
   
   Basicly cylinders one, two and four are around the same compression rate but cylinder three is compressing 3 bar higher than the others.
   
   Any help would be much appreciated
   
   Thanks in advance
   
   Ollie
2. stevyj Regular Poster Joined: May 2010 skipton Posts: 401 metro rio grande pug 306 dt corsa 8v sri tuned

   #2 8th November 2010, 21:00

   maybe piston rings fooked on 3 cylinders?
3. user_29044 Established Member Joined: Dec 2008 Croydon bruvaaaaaa Posts: 1448 Alfa Romeo Mito Cloverleaf & Saxo VT?

   #3 8th November 2010, 21:05

   Quote:

   Originally Posted by stevyj maybe piston rings fooked on 3 cylinders?

   cheers for the imput
   
   But if the piston ring where fooked then there would be a lower compression wouldn't there?
   
   I was thinking if there was a build up of carbon around the exhaust valve which might make it harder to push the excess gases through?
   
   Ollie
4. user_29044 Established Member Joined: Dec 2008 Croydon bruvaaaaaa Posts: 1448 Alfa Romeo Mito Cloverleaf & Saxo VT?

   #4 8th November 2010, 22:04

   anyone else got any helpful imput?
5. Bedford126 Saxperience Post Whore Joined: Jul 2010 Morley, Leeds Posts: 8469 Civic ep3 type r powered by TDI NORTH

   #5 8th November 2010, 22:14

   compression testing test's the cylinder on a squeeze stroke so it will be a build up of shit or carbon in the cylinder or oil in that cylinder causing the pressure to be raised in number 3.

   1 user thanked this post: user_29044
6. user_29044 Established Member Joined: Dec 2008 Croydon bruvaaaaaa Posts: 1448 Alfa Romeo Mito Cloverleaf & Saxo VT?

   #6 8th November 2010, 22:25

   Quote:

   Originally Posted by bedford126 compression testing test's the cylinder on a squeeze stroke so it will be a build up of shit or carbon on the cylinder or oil in that cylinder causing the pressure to be raised in number 3.

   Thanks mate