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Subject: "Cyl. psi low, but even..." Previous topic | Next topic
justins71Jul-31-08 01:50 PM
Member since Oct 25th 2007
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#109542, "Cyl. psi low, but even..."


          

So I'm pretty sure I know the answer to this, but don't want to admit it to myself so I want someone else to say it.
My car's been running hot lately, but mainly only with a/c on in the day time (granted in ~105* temps), but it'd rise a bit above the norm halfway position on occasion. So just to be on the safe side I did a compression test, pulled all plugs, open the TB, d/c fuel pump, and got 140, 140, 145, 142. All nice and close, but low to me. Put a tablespoon or so of oil in #1, and got 210. I'm runnin stock head/valves, stock bore, 8.8:1 with Total seal rings (total seal my ass). I clocked the rings correctly, but yeah.

/>

'95 GS w/ t3/t4b
FMIC, diy piping & RFL BOV
MS2-Extra Fuel&Spark
50 lb/hr Holley injectors w/ 1:1 RRFPR
JE 8.8:1 dish w/ Hastings Rings
Eagle Rods w/ ARP bolts
ARP Head studs
Mild port/polish head
3" custom DP/cat section, 3" PIT catback
dual MBC - 12 psi / 20psi

  

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Replies to this topic
RE: Cyl. psi low, but even..., 740 turbo brick, Jul-31-08 07:55 PM, #1
RE: Cyl. psi low, but even..., AdministratorStar Turbo Talon, Aug-01-08 01:31 AM, #2
      RE: Cyl. psi low, but even..., justins71, Aug-01-08 07:56 AM, #3
           RE: Cyl. psi low, but even..., RoninEclipse2G, Aug-01-08 08:01 AM, #4
                RE: Cyl. psi low, but even..., AdministratorStar Turbo Talon, Aug-01-08 08:29 AM, #5
                     RE: Cyl. psi low, but even..., RoninEclipse2G, Aug-01-08 10:10 AM, #6

740 turbo brickJul-31-08 07:55 PM
Member since Jun 09th 2008
831 posts,
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#109547, "RE: Cyl. psi low, but even..."
In response to Reply # 0




          

Sounds like normal engine wear for a high milage engine. Thing is, I dont know how many miles are on your engine, and with your mods Im assuming it was rebuilt recently.


95 Eclipse GS: 10.5:1, Crower 2's and MSII
186 WHP - 150 WTQ
14.697 @ 93.85 MPH......Gone, but not forgotten
99 420A Avenger: Given to my sister
99 GS OZ: Sold
03 Evo 8: Family Car with balls

  

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AdministratorStar Turbo TalonAug-01-08 01:31 AM
Member since Oct 21st 2003
8331 posts,
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#109549, "RE: Cyl. psi low, but even..."
In response to Reply # 1




          

Engien hot or cold when you did the test?

  

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justins71Aug-01-08 07:56 AM
Member since Oct 25th 2007
466 posts,
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#109552, "RE: Cyl. psi low, but even..."
In response to Reply # 2


          

engine warmed up, then about 15-20 min cool off before pulling plugs. It does have maybe 30k on it. I remember doin the test shortly after I built it (maybe after 3k or so) and it was only around 150. I just thought the low numbers were my rings still seating, but after 3k they should be well set. This was my first low comp build; I'm used to ~210 psi norm, with 180 being on the lowest side. Thing is if I run it hard day-to-day, it'll go through a quart of oil a week or so. Babying it, I can go 4 months or so before i'd need to add anything. I've rebuild the turbo once already just as pm, and it wasn't leaking before or currently, so the oil's not going through there.

/>

'95 GS w/ t3/t4b
FMIC, diy piping & RFL BOV
MS2-Extra Fuel&Spark
50 lb/hr Holley injectors w/ 1:1 RRFPR
JE 8.8:1 dish w/ Hastings Rings
Eagle Rods w/ ARP bolts
ARP Head studs
Mild port/polish head
3" custom DP/cat section, 3" PIT catback
dual MBC - 12 psi / 20psi

  

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RoninEclipse2GAug-01-08 08:01 AM
Donating 2GNT member
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#109553, "RE: Cyl. psi low, but even..."
In response to Reply # 3




          

I would pull compression without a cooldown time. double glove it to prevent burns and get crackin right after warming up.

Erik P.
Official 2GNT thread Hijacker
Some say that he's driven over more Covenant than he's shot, and that his grenades aren't where you'd expect them to be...
All we know is, He's not The Stig... But he is The Stig's Spartan cousin!

  

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AdministratorStar Turbo TalonAug-01-08 08:29 AM
Member since Oct 21st 2003
8331 posts,
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#109555, "RE: Cyl. psi low, but even..."
In response to Reply # 4




          

I get 150 across cold. I am sure its not that much better warmed up. Block has 10k at the most.

  

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RoninEclipse2GAug-01-08 10:10 AM
Donating 2GNT member
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#109559, "RE: Cyl. psi low, but even..."
In response to Reply # 5




          

just noticed, you are running low compression pistons, that sounds about right

Erik P.
Official 2GNT thread Hijacker
Some say that he's driven over more Covenant than he's shot, and that his grenades aren't where you'd expect them to be...
All we know is, He's not The Stig... But he is The Stig's Spartan cousin!

  

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