PPI leak down test results
07-26-2011, 09:08 AM
#1
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PPI leak down test results
Hello to all of you,
I am looking at a 1990 c2 and the PPI result came in:
#1- 15%
#6-15%
#2- 25% (rings)-not major.
#4- 15%
#3- 15%
#5- 10%
I am just concern by the #2 at 25%.
Also there is a small leak from the chain case, they recommend a reseal.
The car is in really good shape and very well taken care of.
I would like some feed back.
Thank you in advance
I am looking at a 1990 c2 and the PPI result came in:
#1- 15%
#6-15%
#2- 25% (rings)-not major.
#4- 15%
#3- 15%
#5- 10%
I am just concern by the #2 at 25%.
Also there is a small leak from the chain case, they recommend a reseal.
The car is in really good shape and very well taken care of.
I would like some feed back.
Thank you in advance
07-26-2011, 09:31 AM
#2
Rennlist Member
I would only consider this car if you are willing to drop some big money into it. This is an old post from Steve Weiner @ Rennsport Systems that I dug up on the Pelican Parts engine rebuilding forum:
If I might add,......
The real value of leakdown testing is the ability to pinpoint WHERE any noted cylinder leakage comes from. If a technician doesn't investigate and write down the source of the results on the guage, he isn't doing you any favors.
Air leaks heard from the airbox-air cleaner assembly shows leaking intake valves.
Air leaks heard from the exhaust pipe(s) shows leaking exhaust valves.
Air leaks heard from the oil tank filler tube shows leaky rings.
This is how the numbers on the leakdown guage are quantified: 0-5% is about perfect, 6-10%is great, 11-20% requires some investigation, 20%+ shows a problem.
Compression tests do NOT tell you WHERE the source of any compression loss is.
The real value of leakdown testing is the ability to pinpoint WHERE any noted cylinder leakage comes from. If a technician doesn't investigate and write down the source of the results on the guage, he isn't doing you any favors.
Air leaks heard from the airbox-air cleaner assembly shows leaking intake valves.
Air leaks heard from the exhaust pipe(s) shows leaking exhaust valves.
Air leaks heard from the oil tank filler tube shows leaky rings.
This is how the numbers on the leakdown guage are quantified: 0-5% is about perfect, 6-10%is great, 11-20% requires some investigation, 20%+ shows a problem.
Compression tests do NOT tell you WHERE the source of any compression loss is.
07-26-2011, 09:58 AM
#3
Drifting
Jim, you beat me to it...I was searching for the same thread. I need to print out Steve's post and hang it on the, huh, what was I saying?, your damn avatar with the H4s got me distracted again.
07-26-2011, 12:29 PM
#6
RL Technical Advisor
Hello to all of you,
I am looking at a 1990 c2 and the PPI result came in:
#1- 15%
#6-15%
#2- 25% (rings)-not major.
#4- 15%
#3- 15%
#5- 10%
I am just concern by the #2 at 25%.
Also there is a small leak from the chain case, they recommend a reseal.
The car is in really good shape and very well taken care of.
I would like some feed back.
Thank you in advance
I am looking at a 1990 c2 and the PPI result came in:
#1- 15%
#6-15%
#2- 25% (rings)-not major.
#4- 15%
#3- 15%
#5- 10%
I am just concern by the #2 at 25%.
Also there is a small leak from the chain case, they recommend a reseal.
The car is in really good shape and very well taken care of.
I would like some feed back.
Thank you in advance
25% is a problem if its coming from the rings as that requires some major expense to resolve.
Overall, those leakdown numbers are not great and some further investigation is needed before you make an offer on the car.
07-26-2011, 07:48 PM
#7
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Thank you for all your honest inputs, again I am a true believer in PPI, the $450 I spent were well worth it.
Because of it I will pass on the car.
I think that looking for a 964 will be a full time job for me ;-)
Cheers,
Sonauto
Because of it I will pass on the car.
I think that looking for a 964 will be a full time job for me ;-)
Cheers,
Sonauto
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07-27-2011, 07:30 AM
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07-27-2011, 09:05 AM
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07-27-2011, 10:09 AM
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I am looking for a coupe with a manual trans, no white no red.
I am looking for a dry engine.
The mileage doesn't scars me as I experienced on my previous search ( she had less than 60K).
Thank you for all your help.
Sincerely,
I am looking for a dry engine.
The mileage doesn't scars me as I experienced on my previous search ( she had less than 60K).
Thank you for all your help.
Sincerely,
07-27-2011, 10:42 AM
#13
Rennlist Member
Do you have any restrictions on what part of the country or world you're willing to consider looking in? In my case, I was willing to look anywhere in the continental US, and ended up buying a 964 that was located in Chicago, IL.
07-27-2011, 11:01 AM
#14
Rennlist Member
