Are these compression numbers scary?

We go through this every couple of days.

What did your mechanic say?

Was the test done with a hot motor?

There are so many variables that really only the guy that did the test can put it in context and comment on it. If the person doing the test was not very experienced with Ferrari and does not feel comfortable or is incapable of making a judgement or if you do not have confidence in it and needed to come here you picked the wrong guy.

If that was a cold motor, those are good numbers. If it was hot and the tests were done the way they really should be they are not.

 

Exactly...gotta done with hot engine. Now, how do you get those percentages , cuz, man, (scratching scalp), 140 on 100 is not 15% difference. Is it more like 40% off from the "non oil" test?Help.

 

Be careful with Ferrari of NEw England. That is all I will say.

 

You know, the longer I am on this board, the more I am starting to believe the advice LFSC gave me...

"If you are buying a 355, or pre 70's car, get a leakdown. Anything else probably doesn't need one..."

Seems like most of the leakdowns folks post on here end up meaning little, and rarely impact the purchase...

One mans "crappy" leakdown is anothers "good" leakdown.

Don't mean to be a heritic, but it seems to be the trend...

 

That was lousy advice, it just needs to be done by someone that knows how and can interpret the findings. Then he needs to communicate the information in a meaningful way to the client. If you did a bunch of medical tests on me and dumped raw information on me it would be meaningless. Likewise if there was no context or testing standards used or recorded they would be almost a worthless to another Physician to explain.

If you are paying for a PPI you should get the whole job and not have to come here to get the other half as so many seem to need to do.

 

Unless you are holding back you recieved incomplete information. The written report should have much more.

 

Unless you are holding back you recieved incomplete information. The written report should have much more.

In my opinion it should be a stand alone document.

 

Leakdowns are like cholesterol readings...depends what you want to believe. All other things being equal, a lower number is better .

10 years ago, an LDL (bad chol) of <160 was pretty good. Then, they recommeded <130. Then <100. Now, if you are diabetic or have heart disease, <70 is great. There are many variations on this. An ldl of 200 is almost irrelevant if you are 95 years old...if you have lived that long, who am I to throw you on meds now? Would probably cause more harm than good.

Actually, this almost sounds like ferrari's belt change intervals . Pretty soon, folks will need chol levels of zero.

 

what I riot! though I am not a physician, the trends outlined above sounda about right

 

You are talking about a science that is constantly evolving because of research constantly updating our understanding.

Our understanding of compression and the importance of cylindersealing has not changed in 75 years.

 

I am not being critical of you. Quite the contrary. I am being critical of the fact that you paid for answers and still needed to come here to get them.

 

On the assumption that the test was performed correctly, those numbers are rather poor. I have an 83 QV and compression is above 180 across the board. 2 years ago, when I saw compression drop to under 140 on one bank, I pulled the engine apart and found more problems than I had anticipated. The fact that all your compression # are very close, I personally would have the gauge verified. Leak down above 10%, to me, means teardown time. But again, this is based on the test being performed correctly. If you have any doubt at this point, have another test performed by another shop. There are several qualified shops in the northern NJ area.