Brillo's 2004 45,000mi Compression Test
07-29-2007, 06:16 PM
#1
Go Texas Longhorns!
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Brillo's 2004 45,000mi Compression Test
Just thought people would like to know that i recently had my 2004 RX8 (12/2003 build) engine compression tested as I'm close to running off the bumper to bumper warranty. My compression test came back 110-120psi in both chambers, which is optimum compression as I understand. Most of the engine replacements appear to come from my vintage, so it was refreshing to see my engine test well.
I've never really had any "engine" Issues other than a rough idle which was likely more the mounts than the engine. I have run royal purple 5W-30 in the car since about 3,000 mi. I also have premixed when on the track but not usually when daily driving. The car is my daily driver so it sees alot of stop and go traffic, although I do punch the engine a fair amount as well for fun. Houston is also not exactly a cool environment (summers in the high 90's low 100's), but we do have humidity, unlike Las Vegas.
given the oiling system issues that have contributed to the problem, I can say if it was my getting on the engine, the Royal Purple, or the likely combination that have helped protect my engine.
Anyways just thought I'd post a "my engine is running great thread" to counter some of the negative press of late.
I've never really had any "engine" Issues other than a rough idle which was likely more the mounts than the engine. I have run royal purple 5W-30 in the car since about 3,000 mi. I also have premixed when on the track but not usually when daily driving. The car is my daily driver so it sees alot of stop and go traffic, although I do punch the engine a fair amount as well for fun. Houston is also not exactly a cool environment (summers in the high 90's low 100's), but we do have humidity, unlike Las Vegas.
given the oiling system issues that have contributed to the problem, I can say if it was my getting on the engine, the Royal Purple, or the likely combination that have helped protect my engine.
Anyways just thought I'd post a "my engine is running great thread" to counter some of the negative press of late.
07-29-2007, 06:31 PM
#3
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Even though I'm a 2005, it's nice to hear some good news with that kinda mileage. Your humidity in Houston is similiar to mine in Florida(East Coast), so that's good news!
Still running 5w20, but will probably go to 5w30 here on next oil change. Think I'll stay Dino though. Don't turn this into another oil thread guys, just commenting on his use of syn.
Still running 5w20, but will probably go to 5w30 here on next oil change. Think I'll stay Dino though. Don't turn this into another oil thread guys, just commenting on his use of syn.
07-29-2007, 06:41 PM
#5
Just to add a counter to this - A proper compression check will be for each chamber of each rotor, yielding 6 numbers.
Since this check is in PSI and without a relevant RPM number, we don't know how the check was run and using what equipment.
A motor with a single blown apex seal could actually return numbers this high (with a lot of ifs, but it is possible) if an accumulative compression test was done with a mechanical gauge.
Since this check is in PSI and without a relevant RPM number, we don't know how the check was run and using what equipment.
A motor with a single blown apex seal could actually return numbers this high (with a lot of ifs, but it is possible) if an accumulative compression test was done with a mechanical gauge.
07-29-2007, 06:41 PM
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Good to see. Without exception all of the Atlanta/Southeast bunch that I am familiar with (more than a dozen) that regularly excercise their 8's have not had a single serious occurance of engine trouble. The ones maintained by my shop are on Valvoline 5/20. Seems that good maintanence and plenty of hard excercise pays off.
07-29-2007, 06:44 PM
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Just to add a counter to this - A proper compression check will be for each chamber of each rotor, yielding 6 numbers.
Since this check is in PSI and without a relevant RPM number, we don't know how the check was run and using what equipment.
A motor with a single blown apex seal could actually return numbers this high (with a lot of ifs, but it is possible) if an accumulative compression test was done with a mechanical gauge.
Since this check is in PSI and without a relevant RPM number, we don't know how the check was run and using what equipment.
A motor with a single blown apex seal could actually return numbers this high (with a lot of ifs, but it is possible) if an accumulative compression test was done with a mechanical gauge.
07-29-2007, 06:49 PM
#8
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Just to add a counter to this - A proper compression check will be for each chamber of each rotor, yielding 6 numbers.
Since this check is in PSI and without a relevant RPM number, we don't know how the check was run and using what equipment.
A motor with a single blown apex seal could actually return numbers this high (with a lot of ifs, but it is possible) if an accumulative compression test was done with a mechanical gauge.
Since this check is in PSI and without a relevant RPM number, we don't know how the check was run and using what equipment.
A motor with a single blown apex seal could actually return numbers this high (with a lot of ifs, but it is possible) if an accumulative compression test was done with a mechanical gauge.
07-29-2007, 07:00 PM
#10
He's as bad as Can
I had a compression test done this past Thurs. Brillo can you post yours in a simillar format? I have 98,000 miles in my motor and the lower RPM I think was do to having a original starter. While on the low end of ok it does show things are not that bad with my nearly 100,000 mile motor (5/2003 build).
Rotor #1 93.125 / 92.275 / 92.085 @ 205 RPM
Rotor #2 92.075 / 94.105 / 95.120 @ 204 RPM
Rotor #1 93.125 / 92.275 / 92.085 @ 205 RPM
Rotor #2 92.075 / 94.105 / 95.120 @ 204 RPM
07-29-2007, 07:24 PM
#11
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I had my dealer do my test. I don't have a print out, the device they had at the dealer couldn't produce a print out so all I got were certified #'s from the service manager.
In hindsight, MM is correct, its best to have reading for both chambers. Next time I feel the need to test, I may try another shop that I think has an old school compression tester. I had my car at the dealer getting my steering issue resolved so it was more convenient to do it while they had it.
I also should point out i get pretty good mileage as well compared to most, about 16/17 city and 23/24 hwy on average.
It wouldn't be a thread with out MM picking on me
In hindsight, MM is correct, its best to have reading for both chambers. Next time I feel the need to test, I may try another shop that I think has an old school compression tester. I had my car at the dealer getting my steering issue resolved so it was more convenient to do it while they had it.
I also should point out i get pretty good mileage as well compared to most, about 16/17 city and 23/24 hwy on average.
It wouldn't be a thread with out MM picking on me
07-29-2007, 10:57 PM
#12
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what what what? my turn to pick a nit-
the dealer has the proper tool to give you the proper nubers- he cant report them any otehr way? wtf is he smoking?
his wds(whatever the correct letters are for the new one they are using) reports the numbers for each chamber and the largest difference between chambers for each rotor and the largest difference between rotor 1 and 2. thats what the test reports. how did he test it?
-the dealer has the proper tool to give you the proper nubers- he cant report them any otehr way? wtf is he smoking?
his wds(whatever the correct letters are for the new one they are using) reports the numbers for each chamber and the largest difference between chambers for each rotor and the largest difference between rotor 1 and 2. thats what the test reports. how did he test it?
07-29-2007, 11:15 PM
#13
Good to see. Without exception all of the Atlanta/Southeast bunch that I am familiar with (more than a dozen) that regularly excercise their 8's have not had a single serious occurance of engine trouble. The ones maintained by my shop are on Valvoline 5/20. Seems that good maintanence and plenty of hard excercise pays off.
07-30-2007, 06:33 AM
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what what what? my turn to pick a nit-
the dealer has the proper tool to give you the proper nubers- he cant report them any otehr way? wtf is he smoking?
his wds(whatever the correct letters are for the new one they are using) reports the numbers for each chamber and the largest difference between chambers for each rotor and the largest difference between rotor 1 and 2. thats what the test reports. how did he test it?
-the dealer has the proper tool to give you the proper nubers- he cant report them any otehr way? wtf is he smoking?
his wds(whatever the correct letters are for the new one they are using) reports the numbers for each chamber and the largest difference between chambers for each rotor and the largest difference between rotor 1 and 2. thats what the test reports. how did he test it?
07-30-2007, 07:34 AM
#17
Go Texas Longhorns!
Thread Starter
what what what? my turn to pick a nit-
the dealer has the proper tool to give you the proper nubers- he cant report them any otehr way? wtf is he smoking?
his wds(whatever the correct letters are for the new one they are using) reports the numbers for each chamber and the largest difference between chambers for each rotor and the largest difference between rotor 1 and 2. thats what the test reports. how did he test it?
-the dealer has the proper tool to give you the proper nubers- he cant report them any otehr way? wtf is he smoking?
his wds(whatever the correct letters are for the new one they are using) reports the numbers for each chamber and the largest difference between chambers for each rotor and the largest difference between rotor 1 and 2. thats what the test reports. how did he test it?
07-30-2007, 12:20 PM
#19
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I'm at 33K on mine, maybe I'll do this next time mine's in the shop.
07-30-2007, 03:56 PM
#20
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Wife's 2004 AT with 84,000 miles
8.1, 8.2, 8.1 @ 267rpm
8.2, 8.4, 8.2 @ 266rpm
But the dealer says she needs a new engine.
The car has been running flawless for the past 11 days with 4 tanks of fuel through it.
8.1, 8.2, 8.1 @ 267rpm
8.2, 8.4, 8.2 @ 266rpm
But the dealer says she needs a new engine.
The car has been running flawless for the past 11 days with 4 tanks of fuel through it.
07-31-2007, 11:16 AM
#23
The process for the recall doesn't even list a compression check as part of the test.
All they are supposed to do (besides all of the usual crap about the WDS/eMDCS, checking for stickers, etc) is drive the car twice for 20 minutes - once after running the OMP on full for 5 minutes - and look for a serious drop in idle (or stalling) or a serious loss of power. Then they run a vacuum test with a special rig comprised of a MAP sensor and an interface to the BARO sensor that they just check for output voltage. They don't even tell the techs what a "normal" voltage should be for that test. They make them call the tech line.
What I found interesting about that test is the complete lack of smoke from the car while the OMP is on full at idle! That should tell you something about how little oil the seals are getting by design!
All they are supposed to do (besides all of the usual crap about the WDS/eMDCS, checking for stickers, etc) is drive the car twice for 20 minutes - once after running the OMP on full for 5 minutes - and look for a serious drop in idle (or stalling) or a serious loss of power. Then they run a vacuum test with a special rig comprised of a MAP sensor and an interface to the BARO sensor that they just check for output voltage. They don't even tell the techs what a "normal" voltage should be for that test. They make them call the tech line.
What I found interesting about that test is the complete lack of smoke from the car while the OMP is on full at idle! That should tell you something about how little oil the seals are getting by design!
08-02-2007, 07:21 AM
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I don't know if the question has been asked before...but, damn Maniac, how the hell are you always getting these great shots for your avitars? Do you produce adult videos or something?