Problem & Symptoms: There wasn't really a major problem. My car started fine when cold within 1 to 1.5 sec when hot it usually takes about 1.5-2.25 to fire up after cranking. The other day I took a 300 KM trip, took a short stop (10 mins); when tried to crank it fired up but took slightly longer than usual (I'd say about 2 secs) cold start. Therefore, I decided to get a compression test for my peace of mind (which backfired miserably :eek:)
The Test: Next morning, I booked an appointment at my nearest Mazda for a compression test. As usual, read a lot about compression testing and did my homework before going in. I showed up at Mazda and went straight to the service manager, asking him in what form I was gonna get the final results, 2 RPMs and 6 Numbers; 3 for each Rotor. The manager says, "I am not sure how they do it, I am not a tech but I will pass on all the information I get." I tried to reaffirm by asking if they are gonna normalise the numbers and compensate for altitude (as the city I live in is 1100 feet above sea level). He said he's not sure what I mean by that.
The Results: They took the car away for approximately 90 mins and came back with a set of numbers I was expecting.The numbers are as follows:
Rotor 1: 7,6.9,6.5 at 253 RPM
Rotor 2: 6.9,6.3,6.9 at 252 RPM
I asked him about the compression test procedure and whether he compensated for the altitude. He said that he took the numbers from the tester and plugged them into there 'internal website calculator' to get the final number. At the top of the page he printed out it 'PC calculator2_5_7_07.xls'. I believe this excel file does not take altitude into account. The page looked exactly like this one (example):
Link: http://ift.tt/1Frz8Kq
Decoding the Results: According to my understanding they probably did not normalise the results as the RPM number are 253 and 252. So I am assuming the altitude was still unaccounted for which gave me a little more confidence. Then I used Foxed.ca compression calculator to get the adjusted numbers. Foxed.ca says:
Rotor 1: 7.49,7.38,6.95 at 250 RPM approximately 1100 feet above sea level
Rotor 1: 7.40,6.75,7.40 at 250 RPM approximately 1100 feet above sea level
I know the numbers are not very encouraging. Rotor 1, face with 7 is borderline and Rotor 2, face with 6.78 is below specification. But my car is still running fine for now; as I stepped out and cranked it fired right up in under 1 sec. The only difference I noticed was that after the test the idle got slightly erratic occasionally as I was waiting at traffic lights, nothing major though.
My Questions: 1) How long before my baby dies ? I understand it can be a day or a year, don't give me that answer, I would like to know from someone who has experienced this on how long it took.
2) Do they always decarb before a compression test ? (I will call to confirm tomorrow if they did that in this case.)
3) What should I do to prolong the leftover life on my baby ?
4) Any magic solutions (that actually work) to restore some compression ?
5) Your opinion and advise on the results ?
Specs: 2005 with 60K miles, bone stock.
The Test: Next morning, I booked an appointment at my nearest Mazda for a compression test. As usual, read a lot about compression testing and did my homework before going in. I showed up at Mazda and went straight to the service manager, asking him in what form I was gonna get the final results, 2 RPMs and 6 Numbers; 3 for each Rotor. The manager says, "I am not sure how they do it, I am not a tech but I will pass on all the information I get." I tried to reaffirm by asking if they are gonna normalise the numbers and compensate for altitude (as the city I live in is 1100 feet above sea level). He said he's not sure what I mean by that.
The Results: They took the car away for approximately 90 mins and came back with a set of numbers I was expecting.The numbers are as follows:
Rotor 1: 7,6.9,6.5 at 253 RPM
Rotor 2: 6.9,6.3,6.9 at 252 RPM
I asked him about the compression test procedure and whether he compensated for the altitude. He said that he took the numbers from the tester and plugged them into there 'internal website calculator' to get the final number. At the top of the page he printed out it 'PC calculator2_5_7_07.xls'. I believe this excel file does not take altitude into account. The page looked exactly like this one (example):
Link: http://ift.tt/1Frz8Kq
Decoding the Results: According to my understanding they probably did not normalise the results as the RPM number are 253 and 252. So I am assuming the altitude was still unaccounted for which gave me a little more confidence. Then I used Foxed.ca compression calculator to get the adjusted numbers. Foxed.ca says:
Rotor 1: 7.49,7.38,6.95 at 250 RPM approximately 1100 feet above sea level
Rotor 1: 7.40,6.75,7.40 at 250 RPM approximately 1100 feet above sea level
I know the numbers are not very encouraging. Rotor 1, face with 7 is borderline and Rotor 2, face with 6.78 is below specification. But my car is still running fine for now; as I stepped out and cranked it fired right up in under 1 sec. The only difference I noticed was that after the test the idle got slightly erratic occasionally as I was waiting at traffic lights, nothing major though.
My Questions: 1) How long before my baby dies ? I understand it can be a day or a year, don't give me that answer, I would like to know from someone who has experienced this on how long it took.
2) Do they always decarb before a compression test ? (I will call to confirm tomorrow if they did that in this case.)
3) What should I do to prolong the leftover life on my baby ?
4) Any magic solutions (that actually work) to restore some compression ?
5) Your opinion and advise on the results ?
Specs: 2005 with 60K miles, bone stock.
1 commentaires:
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