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Old 09-05-2010, 03:45 PM   #1
nac91
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Join Date: Jul 2010
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2004 STI
brickyard 350z

Default Low Compression in 2nd Cylinder

so i just discovered my sti has about a compression of 90 in the 2nd cylinder but the other 3 cylinders are fine...i am running the dom 3.0r made 440whp with meth ...how long could i drive the car until it blows but i check the oil constantly and etc...i was planning to do cp pistons and stock rods or should i do rods ex eagle rods?...need some advice here on what pistons and rods i should go with and how much power are people making with the dom 3.0r???...help thanks
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Old 09-08-2010, 12:49 AM   #2
nac91
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brickyard 350z

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anyone????
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Old 09-08-2010, 11:04 AM   #3
rodknock02
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SRP

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I vote cracked piston common problem if its a ej257
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Old 09-08-2010, 11:17 AM   #4
sidewayz
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2nd on the vote if its any 2.5L motor :P
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Old 09-08-2010, 02:12 PM   #5
Bamofo
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TurboMike Tuned 2.35

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The answer we are supposed to give you is fix it right away. But it really depends on what you damaged. if you cracked the sleeve then your going to need a new sleeve anyways so if you dont mind spending a ton of money on oil have at it. But like the other 2 votes if it is a piston issue you are going to scuff up the cylinder even more then it already is and thin down the change that slap in pistons will seal on that cylinder. That and the blowby might eventually make a depression in the cylinder wall.. Its your motor though I run wiseco/Eagle for my setups. Unless someone specifically says i want CP or JE.
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Old 09-08-2010, 07:58 PM   #6
project_skyline
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2011 STI

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What were the other cylinders compression?

I'd pull it and fix it before you have something blow a hole in your block and require more money to fix.

I'm guessing rings, if you blew the ring lands it would damage the cylinder walls and if it was cylinder wall you'd push coolant really bad and it wouldn't run worth a ****. Cracked piston is a possibility. Either way fix it now and save yourself the headache of it being worse.
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Old 09-08-2010, 08:37 PM   #7
nac91
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its a ring...

i have been babying the car rarely hitting boost..my oil level is staying pretty steady and normal...

other 3 cylinders read 130

gunna build as soon as i get the funds just cant decide on a brand of pistons
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