Low Power; Replace, rebuild, or sell?
Thread Starter
Teching In
Joined: May 2012
Posts: 3
Likes: 0
Low Power; Replace, rebuild, or sell? Hey guys, The car is an 01 z06 w/ 90k miles.
I feel like its lacking power and should be quicker. Problem is that I don't know the history of the car or whats in it. It could be the tune, aftermarket parts, or just a worn out motor.
I did a COLD compression test and it confirmed bad numbers.
90-100 psi - first pump
120 psi - cranking
160 psi - with me squirting oil in the spark plug hole
I have the tools to pull out the engine and disassemble it. But I would like to see what other people would do in my position.
Most likely I was thinking to send the block to a machine shop and have them see if they can rework it. Then I would get new pistons with a rebuild kit and have my motor running good as new. I never dealt with a machine shop.
For guys that have dealt with machine shops can I give them all the big parts so they could check them before I assemble it. Since besides the block I was thinking of also checking the valves for leakage and getting a valve job if they are bad, and also the condition of the crank. (The crank seems fine, no knocking)
Do you guys know how much the machining would cost and also the rebuild kit? Because I've seen these motors go for $2500 - 3000 on the forums.
What do you guys think is the cheapest way to escape my problem.
I feel like its lacking power and should be quicker. Problem is that I don't know the history of the car or whats in it. It could be the tune, aftermarket parts, or just a worn out motor.
I did a COLD compression test and it confirmed bad numbers.
90-100 psi - first pump
120 psi - cranking
160 psi - with me squirting oil in the spark plug hole
I have the tools to pull out the engine and disassemble it. But I would like to see what other people would do in my position.
Most likely I was thinking to send the block to a machine shop and have them see if they can rework it. Then I would get new pistons with a rebuild kit and have my motor running good as new. I never dealt with a machine shop.
For guys that have dealt with machine shops can I give them all the big parts so they could check them before I assemble it. Since besides the block I was thinking of also checking the valves for leakage and getting a valve job if they are bad, and also the condition of the crank. (The crank seems fine, no knocking)
Do you guys know how much the machining would cost and also the rebuild kit? Because I've seen these motors go for $2500 - 3000 on the forums.
What do you guys think is the cheapest way to escape my problem.
Last edited by tripplewhiskeysip; May 30, 2012 at 02:45 PM.
TECH Enthusiast
Joined: Nov 2004
Posts: 714
Likes: 0
From: Tampa FL
Find a 6.0 truck block, and throw some forged pistons in it reusing the stock crank and rods and put your heads and cam back in it. Or do a 402-408 stroker the same way if money isn't an impediment.
Well first i have an old lt1 that broke down here's what happened i think
The cylinder heads became deformed because the air filter was so dirty they couldnt handle all the build up of air and oil coming through the air filter and the throttle body
so i tried replacing the air tube with a cold air intake and i think the extra power blew out the cylinder heads and they crashed through valley pan into the crank.
then the crank spun hard and threw the pistons up to hard to cause a misfire
well what im gonna try to see is i think the camshaft that needs to adjusted it's going through the intake valves right? so im gonna try to wiggle it around and fit it through the valves i guess this is what me and my dad came up with the mechanic told us this is the problem with the heads.
The cylinder heads became deformed because the air filter was so dirty they couldnt handle all the build up of air and oil coming through the air filter and the throttle body
so i tried replacing the air tube with a cold air intake and i think the extra power blew out the cylinder heads and they crashed through valley pan into the crank.
then the crank spun hard and threw the pistons up to hard to cause a misfire
well what im gonna try to see is i think the camshaft that needs to adjusted it's going through the intake valves right? so im gonna try to wiggle it around and fit it through the valves i guess this is what me and my dad came up with the mechanic told us this is the problem with the heads.
Thread Starter
Teching In
Joined: May 2012
Posts: 3
Likes: 0
Thanks
With numbers like that, your rings need replacing or the valves aren't sealing. You are getting about 8:1 static comp. Check your oil to see if there is a bit of fuel in it.
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