Compression test results!
Compression test results! Been trying to figure out why I've been burning oil and was trying to figure out if it was rings or vavle seals. Finally had some time to do a compression test, and at the same time put new plugs and wires in. The results are as follows (I don't know the firing order off the top of my head, so I just did them as each side from front to back):
Car has 128,xxx on the clock.
Driver side, front to back:
185
200
200-203
200-203
Passenger side, front to back:
195-200
200
198-200
195
Everything was pretty much even except for the front cylinder on the driver side. Additionally, we noticed something very strange with that plug. It doesn't want to thread in all the way, it sticks out a little farther than the other plugs. It was like that on the old plug we pulled out, on the compression tester tool that we screwed in, and on the new plug we put in afterwards. It just doesn't go in as far. I figure there might be some gunk or something blocking the threads? It doesn't seem to be affecting anything either so I'm not sure what to do about that.
Also, a new thing we noticed was that when I go WOT, there is a big blue puff of smoke that comes out. Tried it twice, did it both times. Hopefully this can help me narrow it down. What do you guys think? Thanks in advance.
Car has 128,xxx on the clock.
Driver side, front to back:
185
200
200-203
200-203
Passenger side, front to back:
195-200
200
198-200
195
Everything was pretty much even except for the front cylinder on the driver side. Additionally, we noticed something very strange with that plug. It doesn't want to thread in all the way, it sticks out a little farther than the other plugs. It was like that on the old plug we pulled out, on the compression tester tool that we screwed in, and on the new plug we put in afterwards. It just doesn't go in as far. I figure there might be some gunk or something blocking the threads? It doesn't seem to be affecting anything either so I'm not sure what to do about that.
Also, a new thing we noticed was that when I go WOT, there is a big blue puff of smoke that comes out. Tried it twice, did it both times. Hopefully this can help me narrow it down. What do you guys think? Thanks in advance.
I can tell by the readings you got lots of carbon build up and the oil usage maybe because the oil rings are pasted. Run a tank of gas with a large bottle of Chevron Techron in it.Will clean uop the carbon and free up the oil rings.
Compression readings should be in the 160 range stock.
Compression readings should be in the 160 range stock.
I can tell by the readings you got lots of carbon build up and the oil usage maybe because the oil rings are pasted. Run a tank of gas with a large bottle of Chevron Techron in it.Will clean uop the carbon and free up the oil rings.
Compression readings should be in the 160 range stock.
Compression readings should be in the 160 range stock.
Numbers are good. they are less than 10% difference so that's not a problem
Yeah, I thought the readings were pretty good. I'm not listening to what that guy is talking about because hes way off lol. Thanks everyone else, and what do you think it is, rings or valve seals?
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Verdad Gallardo So you say his bumbers are good no problem??? then why is he here??? LMAO
Compression is a relative thing. Two similar engine won't necessarily read the same after a lot of miles down the highway. Carbon build up? Where? On the piston crowns? It would take a heck of a lot of carbon build up to increase compression from 25 to 40 lbs. per cylinder. You can do a leakdown to narrow down the area of leakage. If the leakdown doesn't show evidence of a problem it's not that big of a deal to swap the seals especially using the Vinci/Crane tool. I wouldn't do a spring swap on an LS series without it. Plus this give you a chance to upgrade your springs while changing the seal.
Let's see? If you combine a thin head gasket with cylinder heads that are milled 0.030" along with an 1/8" of carbon on the piston crowns you might increase compression by 40psi.
Sorry maybe you guys can convince yourselfs but go check the compression in a new engine........that cam didn't increase the compression. unless that engine was modded with heads or pistons the compression should be in 160 range.
If you think anything else you don't have alot of experience working on engines and you wouldn't be posting for help. If you know what to look for FIX IT!
Do you have any idea how fast carbon builds up in todays engines with the garbage fuel thet sell. PLUS add the LS1 usually puss oil into the intake you have HUGE carbon build ups FAST>
I'll bet that engine is so full of carbon its INSANE like me!
If you think anything else you don't have alot of experience working on engines and you wouldn't be posting for help. If you know what to look for FIX IT!
Do you have any idea how fast carbon builds up in todays engines with the garbage fuel thet sell. PLUS add the LS1 usually puss oil into the intake you have HUGE carbon build ups FAST>
I'll bet that engine is so full of carbon its INSANE like me!
Sorry maybe you guys can convince yourselfs but go check the compression in a new engine........that cam didn't increase the compression. unless that engine was modded with heads or pistons the compression should be in 160 range.
If you think anything else you don't have alot of experience working on engines and you wouldn't be posting for help. If you know what to look for FIX IT!
Do you have any idea how fast carbon builds up in todays engines with the garbage fuel thet sell. PLUS add the LS1 usually puss oil into the intake you have HUGE carbon build ups FAST>
I'll bet that engine is so full of carbon its INSANE like me!
If you think anything else you don't have alot of experience working on engines and you wouldn't be posting for help. If you know what to look for FIX IT!
Do you have any idea how fast carbon builds up in todays engines with the garbage fuel thet sell. PLUS add the LS1 usually puss oil into the intake you have HUGE carbon build ups FAST>
I'll bet that engine is so full of carbon its INSANE like me!
either agree with me or be WRONG! LMAO
I've been building and working on high perfm engines all my life, you can't BS me about this crap. Yer trying to tell me a engine with over 100k isn't full of carbon BULL PUCKY!
over 128k to be exact!
I've been building and working on high perfm engines all my life, you can't BS me about this crap. Yer trying to tell me a engine with over 100k isn't full of carbon BULL PUCKY!
over 128k to be exact!
I've checked MANY MANY engines that had 190+ compression readings that read 160 after decarboning the cylinders. Go to GM any dealership and ask for their decarbon service and ask why they would bother to do it if it wasn't a HUGE PROBLEM.
I'll betcha stock LS1 in excellent shape will measurse in the 160 range same with the LS6, the ZO6 maybe in the 175 range.
I'll betcha stock LS1 in excellent shape will measurse in the 160 range same with the LS6, the ZO6 maybe in the 175 range.
I gotta add something else......engines with INSANE compression ratios that would give you stock readings of 200+ compression DON"T EXIST on the street because the gasoline available would destroy them! GEEZ where do you guys dream up this stuff?