Author Topic: Compression Test (Read 3550 times)

Justin · « **on:** October 20, 2008, 10:38:28 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

Justin · « **Reply #1 on:** October 23, 2008, 07:22:29 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

jimfoo · « **Reply #2 on:** October 23, 2008, 12:23:27 pm »

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.

the caveman · « **Reply #3 on:** October 23, 2008, 01:57:28 pm »

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.

jtanguay · « **Reply #4 on:** October 23, 2008, 03:54:59 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.

zukgod1 · « **Reply #5 on:** October 23, 2008, 04:55:37 pm »

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