Compression Test - TDI Engine -General Info - VWDiesel.net The IDI, TDI, and mTDI source.

• Compression Test by Justin on 20 Oct, 2008 19:38
• I know its probably been asked before so I apoligize in advance. I want to do a compression test on my MTDI and I dont know what to expect or what is required as a recomended min.
  
  Thanks in advance (its the early TDI and has around 30k on the engine)
  
  later
  Justin
• #1 by Justin on 23 Oct, 2008 04:22
• No One?? what are the compression test numbers for an IDI then?? what is the 1.9 IDI compression ratio? if they are close then I would expect the compression test numbers to be close.
  
  later
  jkeiffer
• #2 by jimfoo on 23 Oct, 2008 09:23
• On mine, I got 400 not too long after the rebuild. I think I had put a 3 notch gasket in to be on the safe side although a 2 was what was on it before. I had slight kiss marks on the pistons, but they were probably from when my IP bracket was loose.
• #3 by the caveman on 23 Oct, 2008 10:57
• In  the Bentley they say 360-450 new , 276 is the bottom limit and no more than 75 lbs between high & low. But i do remember testing TDI's that had almost 500 lbs.
• #4 by jtanguay on 23 Oct, 2008 12:54
• even with bad compression you can still get them to fire up... just need some brake parts cleaner  :lol: the high compression is mainly for cold starting.  you'll get some smoke if the compression is bad enough though.
• #5 by zukgod1 on 23 Oct, 2008 13:55
• My idi was @ 110 110 170 120 and it ran fine if you could get it started  :shock: