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Engine Specific Info and Questions => TDI Engine -General Info => Topic started by: Justin on October 20, 2008, 07:38:28 pm

Title: Compression Test
Post by: Justin on October 20, 2008, 07:38:28 pm

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

Title: Compression Test
Post by: Justin on October 23, 2008, 04:22:29 am

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

Title: Compression Test
Post by: jimfoo on October 23, 2008, 09:23:27 am

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.

Title: Compression Test
Post by: the caveman on October 23, 2008, 10:57:28 am

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.

Title: Compression Test
Post by: jtanguay on October 23, 2008, 12:54:59 pm

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.

Title: Compression Test
Post by: zukgod1 on October 23, 2008, 01:55:37 pm

My idi was @ 110 110 170 120 and it ran fine if you could get it started  :shock: