DIY: RENESIS Compression adjustment & Rating, Excel Application
Thread Starter
IOANNIS
Joined: May 2008
Posts: 19
Likes: 1
From: Athens, Greece
DIY: RENESIS Compression adjustment & Rating, Excel Application
RENESIS Compression adjustment & Rating, Excel Application
I make an Excel Application to make the compression adjustment easy.
The program adjust measuring compression values according to the graph below from RX8 Service Manual.
Compression graph from Service Manual => http://www.imageshack.gr/files/v5e4rp2itz1r1d23cepq.jpg
With the program
you can enter values in kpa, kgf or psi (all values are converted to kpa)
you can save measurements for future reference
you can compare saved measurements
you can sea a similar measurement chart
etc
The Rating uses the limits below
Compression Rating
Standard Difference in Chambers (150 kpa) rating
Standard Difference in Rotors (100 kpa) rating
Download the Application Here => Attachment 192204
You must Enable the Macro in order to allow macros in program to run
Suggestions, Comments etc are welcome, necessary or essential in order to make the App Better
I make an Excel Application to make the compression adjustment easy.
The program adjust measuring compression values according to the graph below from RX8 Service Manual.
Compression graph from Service Manual => http://www.imageshack.gr/files/v5e4rp2itz1r1d23cepq.jpg
With the program
you can enter values in kpa, kgf or psi (all values are converted to kpa)
you can save measurements for future reference
you can compare saved measurements
you can sea a similar measurement chart
etc
The Rating uses the limits below
Compression Rating
PHP Code:
Select Case Val(c_value)
Case Is > 845: Valuate_C150 = "High Compression"
Case 835 To 845: Valuate_C150 = "Standard to High Compression"
Case 822.5 To 835: Valuate_C150 = "Standard"
Case 807.5 To 822.5: Valuate_C150 = "Very Good to Standard"
Case 792.5 To 807.5: Valuate_C150 = "Very Good"
Case 777.5 To 792.5: Valuate_C150 = "Good to Very Good"
Case 762.5 To 777.5: Valuate_C150 = "Good"
Case 747.5 To 762.5: Valuate_C150 = "Fair to Good"
Case 732.5 To 747.5: Valuate_C150 = "Fair"
Case 717.5 To 732.5: Valuate_C150 = "Bad to Fair"
Case 702.5 To 717.5: Valuate_C150 = "Bad"
Case 687.5 To 702.5: Valuate_C150 = "Very Bad to Bad"
Case Is <= 687.5: Valuate_C150 = "Very Bad/Change Motor/Rebuild"
Case Else
End Select
PHP Code:
Select Case c_value
Case Is < 1: Valuate_D150 = "Zero, Ideal"
Case Is = 1, 1 To 15: Valuate_D150 = "Best to Ideal"
Case 15 To 30: Valuate_D150 = "Best"
Case 30 To 45: Valuate_D150 = "Very Good to Best"
Case 45 To 60: Valuate_D150 = "Very Good"
Case 60 To 75: Valuate_D150 = "Good to Very Good"
Case 76 To 90: Valuate_D150 = "Good"
Case 90 To 105: Valuate_D150 = "Fair to Good"
Case 105 To 120: Valuate_D150 = "Fair"
Case 120 To 135: Valuate_D150 = "Bad to Fair"
Case 135 To 150: Valuate_D150 = "Bad"
Case Is > 150: Valuate_D150 = "Very Bad/Change Motor/Rebuild"
Case Else
End Select
PHP Code:
Select Case c_value
Case Is < 1: Valuate_D100 = "Zero, ideal"
Case Is = 1, 1 To 10: Valuate_D100 = "Best to ideal"
Case 10 To 20: Valuate_D100 = "Best"
Case 20 To 30: Valuate_D100 = "Very Good to Best"
Case 30 To 40: Valuate_D100 = "Very Good"
Case 40 To 50: Valuate_D100 = "Good to Very Good"
Case 50 To 60: Valuate_D100 = "Good"
Case 60 To 70: Valuate_D100 = "Fair to Good"
Case 70 To 80: Valuate_D100 = "Fair"
Case 80 To 90: Valuate_D100 = "Bad to Fair"
Case 90 To 100: Valuate_D100 = "Bad"
Case Is > 100: Valuate_D100 = "Very Bad/Change Motor/Rebuild"
Case Else
End Select
You must Enable the Macro in order to allow macros in program to run
Suggestions, Comments etc are welcome, necessary or essential in order to make the App Better
Last edited by IOANNIStsa; May 8, 2013 at 11:42 AM. Reason: ADD EXCEL APPLICATION ATTACH FILE TO POST
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Joined: Apr 2009
Posts: 918
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Hmmmmz... kind of what i needed... waiting for the attachment...
(hopefully can help me on this stupid readings...)
https://www.rx8club.com/series-i-trouble-shooting-95/new-reman-engine-failed-compression-211529/#post3886227
(hopefully can help me on this stupid readings...)
https://www.rx8club.com/series-i-trouble-shooting-95/new-reman-engine-failed-compression-211529/#post3886227
Thread Starter
IOANNIS
Joined: May 2008
Posts: 19
Likes: 1
From: Athens, Greece
Registered
Joined: Apr 2009
Posts: 918
Likes: 0
OMG! IOANNIStsa this is one of the best Excel Application !
MOD... Please sticky this !!!!
on side note...
this is wat resulted using this excellent, easy to understand and convert application... (Since only the 2nd workshop was able to get some reading using the PSI measurement and reading the compression at 187 rpm...)
Rotor 01 (i assume front): Rotor 02 (i assume rear):
First Chamber: 100 First Chamber: 116
Second Chamber: 98 Second Chamber: 115
Third Chamber: 100 Third Chamber: 114
* Comments showing standard to high compression for Rotor 01.
* Comments showing high compression for Rotor 02.
But comments for differnce in Rotors: recommended a rebuild.
IOANNIStsa... can i send over my word file of my compression and have u look at it and see what is going on? did i input the right figures in etc...
Thread Starter
IOANNIS
Joined: May 2008
Posts: 19
Likes: 1
From: Athens, Greece
OMG! IOANNIStsa this is one of the best Excel Application !
MOD... Please sticky this !!!!
on side note...
this is wat resulted using this excellent, easy to understand and convert application... (Since only the 2nd workshop was able to get some reading using the PSI measurement and reading the compression at 187 rpm...)
Rotor 01 (i assume front): Rotor 02 (i assume rear):
First Chamber: 100 First Chamber: 116
Second Chamber: 98 Second Chamber: 115
Third Chamber: 100 Third Chamber: 114
* Comments showing standard to high compression for Rotor 01.
* Comments showing high compression for Rotor 02.
But comments for differnce in Rotors: recommended a rebuild.
IOANNIStsa... can i send over my word file of my compression and have u look at it and see what is going on? did i input the right figures in etc...
MOD... Please sticky this !!!!
on side note...
this is wat resulted using this excellent, easy to understand and convert application... (Since only the 2nd workshop was able to get some reading using the PSI measurement and reading the compression at 187 rpm...)
Rotor 01 (i assume front): Rotor 02 (i assume rear):
First Chamber: 100 First Chamber: 116
Second Chamber: 98 Second Chamber: 115
Third Chamber: 100 Third Chamber: 114
* Comments showing standard to high compression for Rotor 01.
* Comments showing high compression for Rotor 02.
But comments for differnce in Rotors: recommended a rebuild.
IOANNIStsa... can i send over my word file of my compression and have u look at it and see what is going on? did i input the right figures in etc...
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Joined: Apr 2009
Posts: 918
Likes: 0
Short story, shorter.....
Have overhauled an engine, with the workshop claiming to replace all parts... housing, rotors, apex seals, sidewalls, and reused the corner springs (as they said this needs no replacing) with mild porting...
So far, engine does not suffer any loss of power. Pickup is fantastic!
However after running in, i decided to do a compression test...
1st workshop = failed
( just for info... front rotor at 182rpm ------> 0.55 / 0.55 / 0.51 rear rotors cant read)
--> Front rotor @ 250rpm 0.65 / 0.65 / 0.61
--> Rear rotor @ 250rpm 999 (means, no reading)
2nd workshop = passed (but remarkably? let me know)
*first he said that 04' (pre-fl rx-8) has a weak starter... The FL rx-8 (think here it is called s2 units) has a better starter.... (anyone knows where to get them?)
Thus he say he needs to use this conversion to get the results... It wont differ much, he said...
http://virusakos.freevar.com/web/RX_...alculator.html
Choose measurement unit: PSI
Choose results unit: PSI
Front Rotor:
RPM = 187
First Chamber = 100
Second Chamber = 98
Third Chamber = 100
Rear Rotor:
RPM = 187
First Chamber = 116
Second Chamber = 115
Third Chamber = 114
After conversion........................................ ....................
Front Rotor:
First Chamber [ 98.6, 120 ] : 122.11
Second Chamber [ 98.6, 120 ] : 120.11
Third Chamber [ 98.6, 120 ] : 122.11
Chambers Difference [ <21.8 ] : 2
Rear Rotor:
First Chamber [ 98.6, 120 ] : 138.11
Second Chamber [ 98.6, 120 ] : 137.11
Third Chamber [ 98.6, 120 ] : 136.11
Chambers Difference [ <21.8 ] : 2
Rotors difference [ ,14.5 ] : 16
- So is my engine reading like it is brand new or just fairing well?
- Is it true that the 04-08 models starter are weak? I have read abt these and it seems to be true... Is this starter one of the possible cause why i have a slight delay when cranking up the rx-8? (i use to think that my delay in cranking was because of my relocation to the rear boot) the delay is like 1 or 1.5 sec delay compared to other friend's stock rx-8...
- why the difference is the two workshops? any truth?
- anyone knows how to convert the readings in the 2nd workshop to readings of MPa instead of PSI?
Any help or shedding more light on this matter is greatly appreciated..
Thank you.
These were copied and pasted from another thread... IONNIStsa... the ones in Bold... Do i take the first two readings or the last two reading (the one after pressing the conversion button, its a website the workshop goes to[http://virusakos.freevar.com/web/RX_...lculator.html], to do the conversion readings) that is derived after the conversion?
Million thanks in advance!
Last edited by Blacknightz; Mar 14, 2011 at 06:09 AM.
Registered User
Joined: May 2005
Posts: 213
Likes: 0
From: Madrid, Spain
Replacing ALL the housings, rotors, seals and sidewalls would be almost as expensive (if not more) as a new engine...
Thread Starter
IOANNIS
Joined: May 2008
Posts: 19
Likes: 1
From: Athens, Greece
For the Adjustments see the Attached photo or link below.
http://img197.imageshack.us/img197/5851/blacknightz.jpg
Measurement unit: kPa
Front Rotor:
RPM = 250
First Chamber = 838.02
Second Chamber = 825.02
Third Chamber = 838.02
Rear Rotor:
RPM = 250
First Chamber = 949.02
Second Chamber = 942.02
Third Chamber = 935.02
Standard Difference in Rotors 111 (Limit <=100)
The Standard Difference in Rotors Value that is over limit is a minor problem or not problem at all since the Compression over miles drops and the Motor is after a rebuild.
Make a new Compression test after a couple of thousand miles (3000-4000) to see if the difference Increased or not or …
I suppose that the compression test done correctly according to WorkShop Manual.
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Joined: May 2005
Posts: 213
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From: Madrid, Spain
Awesome work on this excel, thanks. Just a feature request: allow to input the altitude and adjust the result to sea level, since for example here in Madrid at 700 meters unadjusted values would be somewhat lower.
Thread Starter
IOANNIS
Joined: May 2008
Posts: 19
Likes: 1
From: Athens, Greece
For the altitude Adjustments see the Attached photo or link below.
http://img13.imageshack.us/img13/1919/67896935.jpg
According to the WorkShop Manual of RX7 altitude Adjustments is about 8,172 kPa per 100 meters or 0,08172 kPa per meter for the first 1200 meters.
There is no Mention in the WorkShop Manual of RX8 as I know so far.
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Thanks a million IOANNIStsa !!!!
but it does seem that my first rotor is lower than the second right? - Meaning to say that they may have did a poorer job on the front rotor compared to the rear?
So ure saying that the difference in rotors is acceptable even though ur excel application state otherwise?
but it does seem that my first rotor is lower than the second right? - Meaning to say that they may have did a poorer job on the front rotor compared to the rear?
So ure saying that the difference in rotors is acceptable even though ur excel application state otherwise?
Thread Starter
IOANNIS
Joined: May 2008
Posts: 19
Likes: 1
From: Athens, Greece
Thanks a million IOANNIStsa !!!!
but it does seem that my first rotor is lower than the second right? - Meaning to say that they may have did a poorer job on the front rotor compared to the rear?
So ure saying that the difference in rotors is acceptable even though ur excel application state otherwise?
but it does seem that my first rotor is lower than the second right? - Meaning to say that they may have did a poorer job on the front rotor compared to the rear?
So ure saying that the difference in rotors is acceptable even though ur excel application state otherwise?
Think that in normal conditions the Back Rotor Compression drops faster than the Front one as a result in a future Compression Test i predict that the Standard Difference in Rotors value would be lower than 111 kPa if the rebuilt was successful
Unsuccessful rebuilt means Compression test Values far below 800 kPa .
Another thought is that the unchanged parts between Front and Back Rotor was not in the same condition and have more wear.
