My rx8 experience :)
10-12-2017, 05:21 AM
#105
What's up guys!
I'm planning to make a Rx8 buying checklist for beginners along with a selling checklist, and i would really like to hear your input on this, so that i can cover all the aspects of it
I'm planning to make at least 10 steps for each of these 2 categories.
Thanks for your help in advance!
I'm planning to make a Rx8 buying checklist for beginners along with a selling checklist, and i would really like to hear your input on this, so that i can cover all the aspects of it
I'm planning to make at least 10 steps for each of these 2 categories.
Thanks for your help in advance!
10-15-2017, 08:14 PM
#108
Something strange is up with those 'after' results . Looks to me like the conversion from psi to Bar is wrong ...............
The after results actually looked a little better than the before ........ I couldn't understand why you said they were worse .
The after results actually looked a little better than the before ........ I couldn't understand why you said they were worse .
10-18-2017, 05:20 AM
#109
You can check out my compression test video to see what i mean.
10-18-2017, 02:32 PM
#110
Well ..........it's very confusing because you start by showing a normal compression tester and even say that it isn't the right thing for a rotary . Then in your results you show 3 numbers per chamber that don't even line up with what is seen on the gauge.
If you hadn't posted the results and were just looking at the gauge in the video you would swear there is a slight improvement after the seafoam treatment.
Maybe you need to explain that the results are normalised for rpm and how you got the numbers for 3 chambers on the video because the first time I saw it I was like WTF !
If you hadn't posted the results and were just looking at the gauge in the video you would swear there is a slight improvement after the seafoam treatment.
Maybe you need to explain that the results are normalised for rpm and how you got the numbers for 3 chambers on the video because the first time I saw it I was like WTF !
Last edited by Brettus; 10-18-2017 at 02:47 PM.
10-18-2017, 02:39 PM
#111
Well ..........it's very confusing because you start by showing a normal compression tester and even say that it isn't the right thing for a rotary . Then in your results you show 3 numbers per chamber so this begs the question............. how the f**k did you get those results from that gauge ?
If you hadn't posted the results and were just looking at the gauge in the video you would swear there is a slight improvement after the seafoam treatment.
Or do you just assume all your viewers are stupid and wont notice these inconsistencies ?
Don't get me wrong , I actually like your style and presentation etc.
If you hadn't posted the results and were just looking at the gauge in the video you would swear there is a slight improvement after the seafoam treatment.
Or do you just assume all your viewers are stupid and wont notice these inconsistencies ?
Don't get me wrong , I actually like your style and presentation etc.
The piston one is not as accurate as a rotary, but still does the measurement required to test the compression.
All of the people that follow me know how i got the results, so i'm not playing anyone here...
see the video on the testing procedure i used here:
10-18-2017, 03:17 PM
#112
The piston one is not as accurate as a rotary, but still does the measurement required to test the compression.
All of the people that follow me know how i got the results, so i'm not playing anyone here...
see the video on the testing procedure i used here: https://www.youtube.com/watch?v=wY_0Giygw1E
All of the people that follow me know how i got the results, so i'm not playing anyone here...
see the video on the testing procedure i used here: https://www.youtube.com/watch?v=wY_0Giygw1E
I just think it's mistake to assume that anyone that watched that video had also watched your 'how to test' video and would know that you had manipulated the numbers in the results . You should at least mention it.
10-18-2017, 03:34 PM
#113
Ok ... I just watched your how to test video . Good job man !
There is however one major issue you have overlooked . With the one way valve removed , your readings will always be 10-15 psi LOWER than the actual readings for the engine .
That is because the engine has to also compress the air inside the tube with each pulse . I do the same thing to give me the variation between rotors but add another step . Do another test with the one way valve in place (i have another tube to do that with) . This will tell you the peak compression . Now use this number in conjunction with the pulse test to find your numbers for each chamber .
There is however one major issue you have overlooked . With the one way valve removed , your readings will always be 10-15 psi LOWER than the actual readings for the engine .
That is because the engine has to also compress the air inside the tube with each pulse . I do the same thing to give me the variation between rotors but add another step . Do another test with the one way valve in place (i have another tube to do that with) . This will tell you the peak compression . Now use this number in conjunction with the pulse test to find your numbers for each chamber .
The following users liked this post:
drivenbymaness (11-07-2017)
10-18-2017, 05:19 PM
#114
∆∆ +100
That's a neat trick Brettus.
In the DIY rotary tester I built based on someone's blueprints in the DIY subforum, I think I posted an excel sheet for adjustinf for, among other things, the extra volume adapters and such add to the combustion chamber size. You can measure the real internal volume of your compression gauge and tube by filling it with known amounts of oil until it's full. Ideally, disassemble it so you can clean it properly after. Then use that excel sheet or PM me to send it to you, if you can't find it.
Your goals are noble, but be careful that people who watch your video don't go making expensive decisions based on procedures and results you provide. You did say you want to rebuild your engine, but it might not actually be as low on compression as you've measured.
That's a neat trick Brettus.
In the DIY rotary tester I built based on someone's blueprints in the DIY subforum, I think I posted an excel sheet for adjustinf for, among other things, the extra volume adapters and such add to the combustion chamber size. You can measure the real internal volume of your compression gauge and tube by filling it with known amounts of oil until it's full. Ideally, disassemble it so you can clean it properly after. Then use that excel sheet or PM me to send it to you, if you can't find it.
Your goals are noble, but be careful that people who watch your video don't go making expensive decisions based on procedures and results you provide. You did say you want to rebuild your engine, but it might not actually be as low on compression as you've measured.
10-21-2017, 05:43 AM
#115
Ok ... I just watched your how to test video . Good job man !
There is however one major issue you have overlooked . With the one way valve removed , your readings will always be 10-15 psi LOWER than the actual readings for the engine .
That is because the engine has to also compress the air inside the tube with each pulse . I do the same thing to give me the variation between rotors but add another step . Do another test with the one way valve in place (i have another tube to do that with) . This will tell you the peak compression . Now use this number in conjunction with the pulse test to find your numbers for each chamber .
There is however one major issue you have overlooked . With the one way valve removed , your readings will always be 10-15 psi LOWER than the actual readings for the engine .
That is because the engine has to also compress the air inside the tube with each pulse . I do the same thing to give me the variation between rotors but add another step . Do another test with the one way valve in place (i have another tube to do that with) . This will tell you the peak compression . Now use this number in conjunction with the pulse test to find your numbers for each chamber .
10-21-2017, 05:47 AM
#116
∆∆ +100
That's a neat trick Brettus.
In the DIY rotary tester I built based on someone's blueprints in the DIY subforum, I think I posted an excel sheet for adjustinf for, among other things, the extra volume adapters and such add to the combustion chamber size. You can measure the real internal volume of your compression gauge and tube by filling it with known amounts of oil until it's full. Ideally, disassemble it so you can clean it properly after. Then use that excel sheet or PM me to send it to you, if you can't find it.
Your goals are noble, but be careful that people who watch your video don't go making expensive decisions based on procedures and results you provide. You did say you want to rebuild your engine, but it might not actually be as low on compression as you've measured.
That's a neat trick Brettus.
In the DIY rotary tester I built based on someone's blueprints in the DIY subforum, I think I posted an excel sheet for adjustinf for, among other things, the extra volume adapters and such add to the combustion chamber size. You can measure the real internal volume of your compression gauge and tube by filling it with known amounts of oil until it's full. Ideally, disassemble it so you can clean it properly after. Then use that excel sheet or PM me to send it to you, if you can't find it.
Your goals are noble, but be careful that people who watch your video don't go making expensive decisions based on procedures and results you provide. You did say you want to rebuild your engine, but it might not actually be as low on compression as you've measured.
Come to think of it your're right, with all the newly aquired info here and on the youtube comments, i'm not satisfied with the compression test video, and i'm thinking of remaking it, so it's done properly. ( along with other videos i'm not satisfied with).
Thanks for all your feedback guys! That's the only way i can improove
10-25-2017, 11:54 PM
#117
Thanks for the feedback, i wish i could get it before i post videos such as this, so i have time to fix things.
Come to think of it your're right, with all the newly aquired info here and on the youtube comments, i'm not satisfied with the compression test video, and i'm thinking of remaking it, so it's done properly. ( along with other videos i'm not satisfied with).
Thanks for all your feedback guys! That's the only way i can improove
Come to think of it your're right, with all the newly aquired info here and on the youtube comments, i'm not satisfied with the compression test video, and i'm thinking of remaking it, so it's done properly. ( along with other videos i'm not satisfied with).
Thanks for all your feedback guys! That's the only way i can improove
The other thing in your video you could change if you are going to redo it : pretty sure the test should be done at operating temp after a 10 minute minimum cool down period . Testing a luke warm engine (per your video)will give you a higher reading . Add that to testing without the one way valve (giving a low reading) and maybe your results weren't that inaccurate after all
10-26-2017, 05:23 PM
#118
The other thing in your video you could change if you are going to redo it : pretty sure the test should be done at operating temp after a 10 minute minimum cool down period . Testing a luke warm engine (per your video)will give you a higher reading . Add that to testing without the one way valve (giving a low reading) and maybe your results weren't that inaccurate after all
11-25-2017, 07:16 AM
#122
Since i was already making a list of tools that i still need to buy, i figured i'd make one for all the new owners who want to start servicing or modding their rx8 at home
The following users liked this post:
gwilliams6 (11-26-2017)