joeystanker

Hey guys,

I got a little evidence of the fruits of my labor today.
I've been meaning to compression test my 944 after all of the work, and today was the big day.

Compression Test: Today
- #1: 180
- #2: 180
- #3: 187
- #4: 185

Last Compression Test: 2014-08-23
- #1: 119
- #2: 117
- #3: 120
- #4: 116

:-)

squid42

That's impressive work!

bonus12

Great numbers

Tiger03447

Lookin' great there Joey ! Great #'s ! I bet that it runns better than it looks..if that's at all possible..Hope that you had a great T-day!

bonus12

Joey, will you now do a leakdown test?

joeystanker

Bonus, what is a leakdown test?
It sounds like something my doctor might do to me.

And, hi Rich :-)

Tiger03447

Dear Joey: It's another test to check the leakdown rate of the rings and valves. You need a special rig and an air compressor. It goes in the spark plug hole. Did you run a wet and dry compression check? I forget..did you do a ring and valve job on the engine? I think you did the valves, but unsure about the ring part..Thanks

joeystanker

Rich,
The cylinder head was cleaned up, planed, and the valves and guided were replaced.
The rings we left alone.

Tiger03447

Joey the #'s look normal to me and they're within the 10% rule . Just wondered if the #s were wet or dry readings

joeystanker

Wet or Dry?
It was totally not raining.

thomasmryan

lol...he is asking if you put a little oil in the cylinders.

Tiger03447

Dear Joey: When one runs a compression test, they run it dry; just like you did in the first test. Then, while the plugs are still out, add about 5 squirts of an oil can of motor oil into the cylinder. Have your buddy turn the engine over about 5 times. Then take another reading. Then go to the next cylinder and do the same thing. This is a wet reading. The oil seals the rings. You can expect the #'s to come up some. If the numbers don't come up an appreciable amount (I forget what it is) you may have ring blowby. The 10% rule between cylinder rule #'s still applies. Thanks, Rich

joeystanker

Thanks Rich.
That is very interesting.
I will give that a try another time.

Dougs951S

I always thought there was no need to run a wet test if the dry numbers were good (and ~180 are great dry numbers). In other words, if the compression was just so-so dry but good wet, then that showed the rings were not sealing well. Since Joey got some really good dry numbers, can it not be assumed that his rings are sealing just fine?

Tiger03447

I would think so...Great #'s, Joey...Sounds as if all is well...:>) !!