TR-01 Rotary Engine Compression Tester - Official Group Buy
#126
AccessPORT Tuner
Jon,
I posted the uncorrected values in my first post....
Here they are again:
TR1 test, Rotor 1
RPM: 298
Face 1, 112 PSI
Face 2, 113 PSI
Face 3, 113 PSI
Rotor 2
RPM: 305
Face 1, 109 PSI
Face 2, 113 PSI
Face 3, 110 PSI
These are uncorrected.
The Mazda tool showed:
Rotor 1
RPM: 250
Face 1, 5.70 kg/cm2
Face 2, 6.10 kg/cm2
Face 3, 6.70 kg/cm2
Rotor 2
RPM: 250
Face 1, 6.80 kg/cm2
Face 2, 7.20 kg/cm2
Face 3, 7.10 kg/cm2
I will try to retest the same engine or another one, so that we get better "statistical" data.
Regards,
George
I posted the uncorrected values in my first post....
Here they are again:
TR1 test, Rotor 1
RPM: 298
Face 1, 112 PSI
Face 2, 113 PSI
Face 3, 113 PSI
Rotor 2
RPM: 305
Face 1, 109 PSI
Face 2, 113 PSI
Face 3, 110 PSI
These are uncorrected.
The Mazda tool showed:
Rotor 1
RPM: 250
Face 1, 5.70 kg/cm2
Face 2, 6.10 kg/cm2
Face 3, 6.70 kg/cm2
Rotor 2
RPM: 250
Face 1, 6.80 kg/cm2
Face 2, 7.20 kg/cm2
Face 3, 7.10 kg/cm2
I will try to retest the same engine or another one, so that we get better "statistical" data.
Regards,
George
#127
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Oh, so you actually were cranking at exactly 250rpm for the Mazda one, that's what I missed. I thought you had corrected the mazda values to 250 as well.
Jon
Jon
#131
hey john received the tool last week thanx ![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
I did a test on my TII S4 , tested from leading plugs holes, throttle wide open with raw data readings
Front 248 RPM 86 85 85
Rear 237 RPM 72 74 73
what correction do i need to do?
spec is min 85 psi on a TII right?
hybrid
![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
I did a test on my TII S4 , tested from leading plugs holes, throttle wide open with raw data readings
Front 248 RPM 86 85 85
Rear 237 RPM 72 74 73
what correction do i need to do?
spec is min 85 psi on a TII right?
hybrid
#132
Compression Tester Guy
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hey john received the tool last week thanx ![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
I did a test on my TII S4 , tested from leading plugs holes, throttle wide open with raw data readings
Front 248 RPM 86 85 85 (corrected) 88.7 87.7 87.7
Rear 237 RPM 72 74 73 (corrected) 74.4 76.4 75.3
what correction do i need to do?
spec is min 85 psi on a TII right?
hybrid
![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
I did a test on my TII S4 , tested from leading plugs holes, throttle wide open with raw data readings
Front 248 RPM 86 85 85 (corrected) 88.7 87.7 87.7
Rear 237 RPM 72 74 73 (corrected) 74.4 76.4 75.3
what correction do i need to do?
spec is min 85 psi on a TII right?
hybrid
I'm glad you like your tester! For correcting those numbers you'd need to multiply the readings by 1.032. That's the correction factor for a S4 TII. This is what I got:
Front 248 RPM 86 85 85 (corrected 88.7 87.7 87.7)
Rear 237 RPM 72 74 73 (corrected 74.4 76.4 75.3)
Now, that doesn't take into account for the slower RPM. For that, we need to take a look at the FSM. Mazda put a graph in each FSM that shows how to compensate for low RPMs during the test. I've got the RX8 FSM downloaded, but can't find my '87 TII FSM at this moment. I'm going to look for it, or start downloading the digital copy and I'll post when I get it.
-John
#134
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Then you have to multiply by the correction factor posted here as well as correcting for RPM.
Jon
#135
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![](http://www.twistedrotors.com/images/S4_FSM_Comp_Test.jpg)
As for leading vs. trailing, I would agree and recommend to re-test from the trailing hole. Personally I don't think there will be much if any difference, but I have not tested the same engine from both leading and trailing so maybe I will learn something new.
![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
-John
#136
Compression Tester Guy
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I'd like to add to keep in mind that the minimum's are just what Mazda recommends. Now for the RX-8 guys under warranty this is a big deal because they could get a new engine installed for free. For those of us that have never owned a rotary with any kind of warranty, then this number becomes subjective. Does your car feel strong? Does it start easily? If yes, then I wouldn't let these numbers bother you that much. The readings are even across the board and that engine may have quite a bit of fun left in it. If on the other hand you've been looking for a sign to drop-in that brand new bridge-port with the giant turbo, then this may be it. ![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
-John
![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
-John
Last edited by TwistedRotors; 06-11-2009 at 11:56 AM.
#140
Compression Tester Guy
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Payments received! Thanks guys.
And if there's anyone on the fence about getting a tester now, there's only 6 days left at the GB price!! Get 'em while they're cheap!
-John
And if there's anyone on the fence about getting a tester now, there's only 6 days left at the GB price!! Get 'em while they're cheap!
-John
#142
Compression Tester Guy
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#147
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Coming right along. ![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
Boards are soldered, sensor modules are assembled....just have to finish machining the cases, mount the boards and screens in the case and close 'em up.![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
-John
![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
Boards are soldered, sensor modules are assembled....just have to finish machining the cases, mount the boards and screens in the case and close 'em up.
![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
-John