collapsed lifter?

Torspd · Sep 15, 2013

burnboy said:
Detonation is pre ignition

Actually, it is relative to where your starting point for "detonation" is. So "pre" still applies, when in reference to a planned time of detonation (otherwise known as combustion). :eviltongue:

MplsX · Sep 15, 2013

Detonation should not be confused with pre-ignition. They are two separate events, however, pre-ignition is usually followed by detonation.

Gadget · Sep 15, 2013

Best if terms are kept simple.

1. Spark Knock This is when the fuel/air charge is ignited by the spark of the spark plug, but at a time that leads to unstable combustion. Normally can be corrected by adjusting the spark timing or fuel air mixture.

2. Detonation When the fuel/air charge is ignited by something other than the spark of the spark plug. Can be caused by excessive compression or something else, just not the spark of the spark plug.

3. Ghost Knock Some made up term on the Internet and somehow ended up on a T-Shirt.

4. Bromance I have no idea what that is.

Torspd · Sep 15, 2013

Glad you all understand. Haha. Dont know how you all were confused?

sdxrunner619 · Sep 15, 2013

burnboy said:
Don't buy an Audi! I'm an Audi master and I'm tellin ya if you want engine problems buy an Audi. Buy a ford homie

Here's 2 piston jobs at once

Oil consumption all day long replacing pistons and rings because the oil control ring hunks up from carbon from blow by because the oil separator can't properly control ring flutter

At any given time, there are 4-6 Is250/gs300's receiving the same treatment at my work...:laugh: Its funny cause all our cars with oil consumption problems are direct injected... 2/3/4grfse all fo them seem to enjoy burning oil.

Are these Audi's direct injected only? (as in no port injectors too) Just curious...

And too OP...just put a LS in there and be done with it. :top:

Torspd · Sep 15, 2013

Kevin, do you tear them down to be able to see the cylinders? Just curious if they have obvious signs of egg-shaped cylinders, from the factory bore process?

I know the M3's come like that because they don't use torque plates during the boring process, at the factory. Thus they have a oil consumption problem as well.

sdxrunner619 · Sep 16, 2013

Torspd said:
Kevin, do you tear them down to be able to see the cylinders? Just curious if they have obvious signs of egg-shaped cylinders, from the factory bore process?

I know the M3's come like that because they don't use torque plates during the boring process, at the factory. Thus they have a oil consumption problem as well.

Yah we are replacing the pistons....so yes. We look for signs of scoring and thats it...I have nave seen anyone actually measure for barreling of the cylinder....

Next time I'm do a piston job, I wanna measure it out of curiosity.

The oil consumption is caused by a faulty piston design. This causes blowby which means loads of oil get sucked through the system. Instead of the oil just being burned off, it gathers on the intake valve (think shell commercials but 5xs worse) then breaks off and causess the misfire. A normal engine this generally wont happe due to it having port inectors. On the 2grfse vs the 3\4 it has port injectors too that "clean" the intake valves and not allow oil to build up there for no allowing the misfire to happen. Though oil consumption is nothing new on those. There is no "recall" on em.

For reference toyota considers up too 1.5 quarts in 1, 200 miles normal.....

Torspd · Sep 16, 2013

Yeah, check it out.

Also, I will see if I can find a video I posted a while ago. Shows how to determine the visible to the naked eye "barreling", as you call it.

burnboy · Sep 16, 2013

In our cars they are direct injection only. No secondary injectors. The reason were told this occurs is that the oil separator or crankcase valve which on our cars it's called an oil separator, is also used to control ring flutter. Too much blow by and the oil control ring gets carbines up and starts consuming oil.

sdxrunner619 · Sep 16, 2013

burnboy said:
In our cars they are direct injection only. No secondary injectors. The reason were told this occurs is that the oil separator or crankcase valve which on our cars it's called an oil separator, is also used to control ring flutter. Too much blow by and the oil control ring gets carbines up and starts consuming oil.

Interesting. I'm gonna look into that some more.

burnboy · Sep 16, 2013

It's all EPA stuff gotta go fifty miles a gallon by 15' I think.

Gadget · Sep 17, 2013

sdxrunner619 said:
Interesting. I'm gonna look into that some more.

Word up on that.

G

dpartinvr4 · Oct 1, 2013

After the last abnormal compression test, i redid it with a different tester, numbers are
155 160
155 160
160 155

So ill say the last tester had a small leak.

Gadget · Oct 1, 2013

Normally it should be in the 180 PSI range, but it could be gauge error.

The important thing is that they are very closely balanced so I would say you are all good there.

G

dpartinvr4 · Oct 1, 2013

Yes, but the knocking connundrum continues lol

Torspd · Oct 1, 2013

Leak-down test, and borescope.

Gadget · Oct 1, 2013

Now start thinking wrist pin and so on.

G

dpartinvr4 · Oct 2, 2013

It almost sounds like its coming from dead center in the rear of the block

You can feel it of you touch the top of the supercharger between the intercooler cover and rotors, but ive unhooked the charger and it still does it, so it's not in the charger.

dpartinvr4 · Oct 2, 2013

Is it possible the vvti is messed up on the drivers side causing the valves to hit each other? I say this because it only makes the noise under certain loads and rpms. ill look at what it's doing on the scanner tomorrow and see if i can find any abnormalities

dpartinvr4 · Oct 2, 2013

Vvt shows 0 accross the board on the scanner, on WOT, ocv opr duty bank 2 goes to 1% that's the only thing i can get it to do.

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collapsed lifter?

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