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Top 2GNT Technical Turbo/Nitrous Tech topic #98806
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Subject: "Compression test, next step!" Previous topic | Next topic
RfOeCnKdOeNrJan-08-07 03:20 AM
Member since Jul 18th 2006
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#98806, "Compression test, next step!"


          

Did my compression test yesterday, 200's across the board!!! I am pumped, starting to piece together my turbo kit as we speak! Should I run a test again in a few months when I plan to install the turbo??

  
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Replies to this topic
RE: Compression test, next step!, Moderatorcs82685, Jan-08-07 04:51 AM, #1
RE: Compression test, next step!, thedawg, Jan-08-07 02:28 PM, #2
      RE: Compression test, next step!, WickedESi, Jan-08-07 03:56 PM, #3
           RE: Compression test, next step!, Blizare, Jan-09-07 03:34 AM, #4
                RE: Compression test, next step!, Moderatorcs82685, Jan-09-07 07:05 AM, #5
                     RE: Compression test, next step!, RfOeCnKdOeNr, Jan-09-07 02:44 PM, #6
                     RE: Compression test, next step!, thedawg, Jan-10-07 07:07 AM, #7
                     RE: Compression test, next step!, Moderatorcs82685, Jan-11-07 06:59 AM, #8
                     RE: Compression test, next step!, boosted60trimrst, Jan-10-07 12:06 PM, #9
                     RE: Compression test, next step!, RyaN95i4, Jan-11-07 10:43 AM, #10

Moderatorcs82685Jan-08-07 04:51 AM
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#98807, "RE: Compression test, next step!"
In response to Reply # 0



          

Originally posted by RfOeCnKdOeNr
Should I run a test again in a few months when I plan to install the turbo??


It couldn't hurt and it will be good to see if it's in the same shape when you go to put the turbo on


I contributed to the Wiki!
EVO IX - just a really expensive boost gauge and a K&N air filter
96 Eclipse RS -awaiting registration and inspection
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thedawgJan-08-07 02:28 PM
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#98809, "RE: Compression test, next step!"
In response to Reply # 1

          

Why does a compression test matter *before* a turbo goes on?

Like say my engine has 243,000 miles and 190-185-170-180 compression... does that mean I can't put a turbo on it safely?

Cause last time I checked, people were blowing ring lands, not rings, *after* they put on the turbo with an insufficient fuel system...

  
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WickedESiJan-08-07 03:56 PM
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#98810, "RE: Compression test, next step!"
In response to Reply # 2



          

It's just standard procedure to see if a engine is up to par for a turbo to be slapped on it, so you don't waste time and money if you don't plan on rebuilding it.


Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician

  
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BlizareJan-09-07 03:34 AM
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#98812, "RE: Compression test, next step!"
In response to Reply # 3



          

Originally posted by WickedESi
It's just standard procedure to see if a engine is up to par for a turbo to be slapped on it, so you don't waste time and money if you don't plan on rebuilding it.


Although your going to have to rebuild it emoji soon enough


I eat emo kids for breakfast

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Moderatorcs82685Jan-09-07 07:05 AM
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#98813, "RE: Compression test, next step!"
In response to Reply # 4



          

Originally posted by Blizare
Originally posted by WickedESi It's just standard procedure to see if a engine is up to par for a turbo to be slapped on it, so you don't waste time and money if you don't plan on rebuilding it.
Although your going to have to rebuild it emoji soon enough


touche. There have been several people who have run for 1.5-2+ years on the stock bottom end though and bee nperfectly happy with it.


I contributed to the Wiki!
EVO IX - just a really expensive boost gauge and a K&N air filter
96 Eclipse RS -awaiting registration and inspection
95 Eclipse GS - parts car
Mods/Profile - http://www.2gnt.com/index.php?d=cs82685

  
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RfOeCnKdOeNrJan-09-07 02:44 PM
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#98814, "RE: Compression test, next step!"
In response to Reply # 5

          

I know it does not make a huge difference, and I am planning a rebuild. It's just nice to know the stock internals are in good shape, for now... lol

  
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thedawgJan-10-07 07:07 AM
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#98817, "RE: Compression test, next step!"
In response to Reply # 5

          

Originally posted by cs82685
There have been several people who have run for 1.5-2+ years on the stock bottom end though

They are the rare exceptions to the rule that says "you're going to blow your shit up and you better have the money for a rebuild before putting on a turbo."

No amount of compression testing will tell you how strong your piston's ringlands are. The test will only show you when you're done breaking in new rings after a rebuild, and on the day your engine starts loping and puffing smoke from the dipstick- that you blew a piston.

If you want to spend time or money testing something before going turbo, get your injectors flow tested.

  
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Moderatorcs82685Jan-11-07 06:59 AM
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#98836, "RE: Compression test, next step!"
In response to Reply # 7
 Jan-11-07 06:59 AM by cs82685



          

Originally posted by thedawg
Originally posted by cs82685 There have been several people who have run for 1.5-2+ years on the stock bottom end though
They are the rare exceptions to the rule that says "you're going to blow your shit up and you better have the money for a rebuild before putting on a turbo." No amount of compression testing will tell you how strong your piston's ringlands are.


I totally agree with that. Fortunately for me, I am one of those lucky few (1.5 years so far) although my hg is leaking like it's its job, but that's due to the moron that rebuilt my head. I got the car back like that but won't bring it back to him cause he's a moron and I didn't pay any money for the job he did, thank god. I think it will just be an excuse to rebuild sooner than later.


I contributed to the Wiki!
EVO IX - just a really expensive boost gauge and a K&N air filter
96 Eclipse RS -awaiting registration and inspection
95 Eclipse GS - parts car
Mods/Profile - http://www.2gnt.com/index.php?d=cs82685

  
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boosted60trimrstJan-10-07 12:06 PM
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#98818, "RE: Compression test, next step!"
In response to Reply # 5



          

Originally posted by cs82685
Originally posted by Blizare
Originally posted by WickedESi It's just standard procedure to see if a engine is up to par for a turbo to be slapped on it, so you don't waste time and money if you don't plan on rebuilding it.
Although your going to have to rebuild it emoji soon enough
touche. There have been several people who have run for 1.5-2+ years on the stock bottom end though and bee nperfectly happy with it.


2+ for me . i do a compression test about once a year . i always get about 205 205 210 210 .

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RyaN95i4Jan-11-07 10:43 AM
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#98841, "RE: Compression test, next step!"
In response to Reply # 5
 Jan-11-07 10:43 AM by RyaN95i4



          

Originally posted by cs82685
Originally posted by Blizare
Originally posted by WickedESi It's just standard procedure to see if a engine is up to par for a turbo to be slapped on it, so you don't waste time and money if you don't plan on rebuilding it.
Although your going to have to rebuild it emoji soon enough
touche. There have been several people who have run for 1.5-2+ years on the stock bottom end though and bee nperfectly happy with it.



I went over 2 years at 12-15psi on a stock bottom end before one piston finally gave in. And even then it was due to heat fatigue, not detonation.

Car was even still driveable, just had 160 compression on #3

95 Avenger
ATX->MTX Swap
Holset HX40 @ 26 psi

  
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