Compression Spec.

1. RustySkull Saxperience Post Whore Joined: Oct 2009 Basildon And Corringham, Essex Posts: 5179 MK1 Focus RS, Discovery TD5, Renault Trafic 2.0

   #1 21st May 2010, 20:53

   Hi friends,
   
   I've done a little search on here and Google and my Haynes Book but I can't find the spec and min Compression in Bar/psi for a MK2 1.1i
   
   I've done a test and I think it's quite low I'd of said it should be around 13-15 Bar myself but they've all came around the 7 mark un-oiled and 9 oiled.
   
   This seems very low to me, although it runs fine and I'm not worried about it.
   
   If anyone knows the specs I'd be greatful
   
   Thanks Guys
2. user_36198 Saxperience Post Whore Joined: Aug 2009 ilkeston derbyshire Posts: 9823 C2 VTR stripped, 406hdi, clio 172

   #2 22nd May 2010, 16:01

   compressions are low at that and if they go up that much when oiled i'd say the rings/bores are starting to get tired. tested a VTS the other day and its was up around 170 psi dry whereas yours are at around 103psi dry and 132 wet

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3. RustySkull Saxperience Post Whore Joined: Oct 2009 Basildon And Corringham, Essex Posts: 5179 MK1 Focus RS, Discovery TD5, Renault Trafic 2.0

   #3 22nd May 2010, 20:36

   Quote:

   Originally Posted by mandyslover70 compressions are low at that and if they go up that much when oiled i'd say the rings/bores are starting to get tired. tested a VTS the other day and its was up around 170 psi dry whereas yours are at around 103psi dry and 132 wet

   Yeh I knew the rings are the problem as they did go up with oiling, I tested my MK1 today and man, it's got none at all one the left two and 3 and 4 bar on the right two haha.
   
   So you're saying the spec is around 170psi? I know it'll never be that as it's on 60,000miles but I just wanted to know what it should be.
   
   Thanks mate.
4. user_36198 Saxperience Post Whore Joined: Aug 2009 ilkeston derbyshire Posts: 9823 C2 VTR stripped, 406hdi, clio 172

   #4 22nd May 2010, 21:34

   the 170 was on a 89k engine!!! shame we found 2 that had less then 30 where the head gasket had split lol, old Land Rover 2286 petrols used to run as low as 120psi even when new
5. user_10176 Saxperience Post Whore Joined: Jun 2006 Ramsey st marys, peterborough Posts: 8288 Saxo's, Corsa (Daily)

   #5 22nd May 2010, 22:45

   170 is about normal for a vts engine to be fair!
   
   my old vts engine, at 80k miles was only 150 psi!
   
   does sound like the rings are worn abit dude.

   1 user thanked this post: RustySkull
6. RustySkull Saxperience Post Whore Joined: Oct 2009 Basildon And Corringham, Essex Posts: 5179 MK1 Focus RS, Discovery TD5, Renault Trafic 2.0

   #6 22nd May 2010, 23:06

   Yup and I have to remember one of the valves is eroded slightly but she's got a good few more miles in her yet poor car lol, Thanks for the help guys.