Leakdown Test/acceptable ranges?
04-22-2008, 01:05 PM
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Leakdown Test/acceptable ranges?
First of all, I have done a search for the subject of a Leakdown Test...and I find a lot about the need to get one along with a PPI when buying a car...but I'm looking for the figures or range of what's considered as acceptable for a range for a given engine.
I have an 87 930 with 54K miles on it, and they've pulled the engine to put in new gaskets and some seals that were leaking. I'm trying to determine what the leakdown figures should be on an engine with that sort of mileage on it. In the event the %'s are high....what's a decent $$$ amount to pay for a top end rebuild...I would guess valve job and guides?
I have an 87 930 with 54K miles on it, and they've pulled the engine to put in new gaskets and some seals that were leaking. I'm trying to determine what the leakdown figures should be on an engine with that sort of mileage on it. In the event the %'s are high....what's a decent $$$ amount to pay for a top end rebuild...I would guess valve job and guides?
04-22-2008, 09:28 PM
#2
Three Wheelin'
Chuck
Good evening.
I just had a leakdown on my motor. I own an 87-930 and it came back around 2-3% for each cylinder. Now, that is a very low number for having 96k on my car and if your engine has been taken care of (valve adjustments on schedule, etc.) for the 54k that are on the car, I would imagine yours would be similar.
Your car could really be anywhere, but I've heard that at 5% your OK, and at 10% they would recommend some work. Anything in the middle is up to the owner and where they are in the process to justify this work. I do not know about cost but I'm sure someone will reply soon with that info.
Not sure how much this will help, but thought I would chime in anyways.
Have a great night. Let me know when you want to come to see the ride.
Bryan
I just had a leakdown on my motor. I own an 87-930 and it came back around 2-3% for each cylinder. Now, that is a very low number for having 96k on my car and if your engine has been taken care of (valve adjustments on schedule, etc.) for the 54k that are on the car, I would imagine yours would be similar.
Your car could really be anywhere, but I've heard that at 5% your OK, and at 10% they would recommend some work. Anything in the middle is up to the owner and where they are in the process to justify this work. I do not know about cost but I'm sure someone will reply soon with that info.
Not sure how much this will help, but thought I would chime in anyways.
Have a great night. Let me know when you want to come to see the ride.
Bryan
04-23-2008, 10:56 AM
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I agree with Bryan's response.
Yasin
Yasin
04-23-2008, 02:02 PM
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Thank you Bryan and Yasin: That helps me put things into perspective a bit. I do have to say that your engine with 96K miles on it still pulling down 3% on a leakdown is a testament to either the engine or your diligent maintenance....or both.....
04-24-2008, 10:00 PM
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04-24-2008, 10:39 PM
#8
Three Wheelin'
Here we go
Temperature means that the leak down should be done on a warm motor, not a cold one. The car should be running, then shut down and then the leak down performed.
As to NathanUK's comments, I think 13-19% is a pretty shot motor. I would say that if you have 10% you may want to look deeper into how long you want to drive the car before you do some major work.
I'm sure that Chucks car will not be in the double digits (I hope) an he can determine how much life it has left. With 54k miles, I'm sure he has a lot of life left unless the thing has been abused which it does not sound like.
Chuck, yes I was suprised with the 3% myself as my car does not have a well documented history, so it was nice to hear. Let us know when you find out the numbers on the leak-down.
Best of luck!
Bryan
As to NathanUK's comments, I think 13-19% is a pretty shot motor. I would say that if you have 10% you may want to look deeper into how long you want to drive the car before you do some major work.
I'm sure that Chucks car will not be in the double digits (I hope) an he can determine how much life it has left. With 54k miles, I'm sure he has a lot of life left unless the thing has been abused which it does not sound like.
Chuck, yes I was suprised with the 3% myself as my car does not have a well documented history, so it was nice to hear. Let us know when you find out the numbers on the leak-down.
Best of luck!
Bryan
04-26-2008, 11:53 AM
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Remember that any debris when you remove your spark plugs may sit on a valve and give you some false readings (higher numbers) and I'm not sure I would pull apart my engine for 10% when it could just be some debris.
05-01-2008, 01:34 AM
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I got the word today that the leakdown figures all the way across all cylinders was 3 and 4%....needless to say, I'm very pleased with those figures. The car should be back this weekend. They reinstalled the engine with all new Blown Six intercooler, SSI system in it, new turbo,Tial,clutch, valve adjustment, powder coated and hoses color coded to match the red and black motif. I'll take some pictures and post.
05-01-2008, 02:27 PM
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I got the word today that the leakdown figures all the way across all cylinders was 3 and 4%....needless to say, I'm very pleased with those figures. The car should be back this weekend. They reinstalled the engine with all new Blown Six intercooler, SSI system in it, new turbo,Tial,clutch, valve adjustment, powder coated and hoses color coded to match the red and black motif. I'll take some pictures and post.
Hope it goes well for you, you'll love the extra power, it's how the 930 should have always been! What turbo did you go with?
05-02-2008, 01:06 AM
#14
Three Wheelin'
Great!
Chuck, glad to see the results were on spot, just as I suspected. Once you get it back, you will need to put 100 miles or so (recommended by Imagine Auto) before you get into boost.
I'm guessing that a trip to Fresno is in order. This may be too soon, but we have a Euro day this Sunday and all the good ones come out to play... Ferarri's, Lambo's, Ford Gt's, Pantera's, Porsche's etc. If not, give me a call and we can arrange a good time to make the trip.
Good News!!
Bryan
I'm guessing that a trip to Fresno is in order. This may be too soon, but we have a Euro day this Sunday and all the good ones come out to play... Ferarri's, Lambo's, Ford Gt's, Pantera's, Porsche's etc. If not, give me a call and we can arrange a good time to make the trip.
Good News!!
Bryan
05-02-2008, 02:19 AM
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Yes Bryan...it's due here Saturday and I dont' know if I'd make a Fresno trip that soon. I'd want to stick around closer to home for a couple hundred miles or so....not that I'm thinking about flatbedding it back home on a CSAA truck or anything .....
Nathan: You're right...I think by the the last count I had killed three black widows, one wolf spider, and a found a brown recluse web....it's been a Loooonnng time coming and now it's time has come. The builder told me to expect another 150HP...but we'll see. I ended up just using the K27 7200 turbo since I'm not after big numbers...more into longevity and reliability (not suggesting the HFS isn't reliable)...but also the overall driveability and with another 150 HP...I'll be happy with the numbers. The builder has taken pictures of the whole build process before, during, and after.... and promises that the results will be "extremely pleasing to the eye" as well as super performance. I had him go thru everything from stem to stern...repack wheel bearings, new ignition wiring, fuses, relays, oil lines, all fluids etc etc etc. The acid test will be my first wild ride....then I'll plan a trip to Fresno Bryan...and we can get together. Fresno was my old stomping ground...graduated from CSUF when it was called Fresno State. I sure wish Chet was around to see the final results. He was giving me pointers and helping me put things together before his tragic passing.
Best regards to you all......Chuck
.....Nathan: You're right...I think by the the last count I had killed three black widows, one wolf spider, and a found a brown recluse web....it's been a Loooonnng time coming and now it's time has come. The builder told me to expect another 150HP...but we'll see. I ended up just using the K27 7200 turbo since I'm not after big numbers...more into longevity and reliability (not suggesting the HFS isn't reliable)...but also the overall driveability and with another 150 HP...I'll be happy with the numbers. The builder has taken pictures of the whole build process before, during, and after.... and promises that the results will be "extremely pleasing to the eye" as well as super performance. I had him go thru everything from stem to stern...repack wheel bearings, new ignition wiring, fuses, relays, oil lines, all fluids etc etc etc. The acid test will be my first wild ride....then I'll plan a trip to Fresno Bryan...and we can get together. Fresno was my old stomping ground...graduated from CSUF when it was called Fresno State. I sure wish Chet was around to see the final results. He was giving me pointers and helping me put things together before his tragic passing.
Best regards to you all......Chuck