Lower compression numbers after lean Dyno ugly plugs

[BryanL]

Initially ran a compression test and had numbers between 185-210 with most around 200-205 so good enough for me. Went to the Dyno and above 4700 or so the air fuel would go up above 14 and buck or pop at times. Blew out the maf messed withe the restrictor and a pull without it but pretty much the same thing. Fuel pressure looked to stay around 58 which is correct for ls1.
Pulled the plugs and a few of them have some weird deposits on them that I now think is oil-will post pics later.

Proceeded another compression test and the numbers are down to 160-190 several cylinders down 20-30 or even 40. Tried a different gauge but same thing. Both tests all the plugs were pulled, efi fuses pulled and ignition coils unplugged. Didn't do anything like find top dead center.

So now the question is do I have an issue with the health of the motor? There are plenty of reasons why it was going lean which I am basically hoping all the stuff I throw at it from what was a good running motor will fix it along with plugs fuel filter clean the maf with cleaner and q tips etc.

I also pulled the intake and there is evidence of oil soaked into the ports on the heads so pretty certain it has been injecting oil which is common. Surprised that I didn't find any bent pushrods either.

Let me know if anyone has thoughts on the compression numbers or run it till it blows up in front of the 55?

[BryanL]

Checked the service manual and the numbers are okay. Also I didnt open the throttle blade on the second test and pretty sure we did on the first. That may explain it. Either way I'm less worried now but will still post pics of a plug. The deposits on the plug weren't there before the first test and only appeared after lean demo runs.

[BryanL]

Here is the worst plug-about one on each side of the motor looked like this.

[MikeP99Z]

I think you need to flush the coolant system. The gunk from your radiator isn't burning correctly in the combustion chamber...

[Trublu]

BL eureka you've discovered penicillin

[Suck fumes]

Running your car above 14:1 for any given time especially above 4k rpm can heat up and warp your valves if you keep running it like that. That's pretty crispy. If you try something else to fix it don't run it all the way through the rpm band if it starts getting lean again.

[Pranav]

RE: the oil getting sucked into the intake, are you running that updated fixed orifice PCV valve that's supposed to fix the issue?

It also fits LT1s, stopped the "reversing of vent flow into the side of the TB" issue, but not sure how that translates to the LS1...

[BryanL]

I have only run it on the dyno and not much as we were trying a few things due to the a/f. But it only started it at first above 5,000. Pumped out the old gas and put in fresh. Same thing. Put in more gas to make sure it wasn't starving and same thing. Took the lid off and cleaned out the grass on the maf but same thing. Pulled the plate out and quit when it still did it.
Now I'm swapping all my old stuff over as far as sensors intake injectors and a new fuel filter. Borrowing an a/f gauge to monitor.
The PVC system was all stock. I'm swapping my vented catch can and closing off the vaccum ports on the intake to keep oil out of the intake. Then see if I can get the tune checked along with monitoring all th sensors. Then a stealth trip around the neighborhood a block from a police station. Or see if I can find a dyno to check it
Obviously want to know it's fixed before tws.
I will also be flushing the radiator for Patterson.

[Hood]

Not sure if you caught what Mike was saying... it looks like you have a coolant leak into the combustion chamber, at least on that cylinder.

[BryanL]

Not sure if you caught what Mike was saying... it looks like you have a coolant leak into the combustion chamber, at least on that cylinder.

Yeah just don't want to acknowledge that it might be a head gasket-if it is then I'm likely out for this weekend. Found a hole in the bellows that may have sucked in some unmetered air after the MAF-just wierd because the A/F wouldn't climb above 13 until upper rpms. A/F gauge is on it now and should be ready for a test drive tonight/tomorrow. I'll just run it around the neighborhood and do a short blast to see if the a/f stays in line. If it does then do it a few more times and pull the plugs.

[Pranav]

1426

[BryanL]

Anyone have experience with the block test fluid kits to see if exhaust gases are in the cooling system showing a bad head gasket? If autozone has it in stock then I'm going to give it a try.

[BryanL]

I think the 55 needs to head to the pharmacy to get some pepto. Block test didn't show a bad head gasket.

[ShadowBolt]

I think the 55 needs to head to the pharmacy to get some pepto. Block test didn't show a bad head gasket.

Do you really start believing all this shit you spout? I will do my talking on the track. Bring it!

JJ

[BryanL]

Do you really start believing all this shit you spout? I will do my talking on the track. Bring it!

JJ

Oh-I'm trying to bring it-I know your bringing your protests forms, too. Question is if I have issues like Ricky Bobby "I'm on Fire!"

[ShadowBolt]

Oh-I'm trying to bring it-I know your bringing your protests forms, too. Question is if I have issues like Ricky Bobby "I'm on Fire!"

I never watched that stupid movie.

JJ

[kbrewmr2]

I never watched that stupid movie.

JJ

you should - even my curmudgeon parents laughed at it

[ShadowBolt]

you should - even my curmudgeon parents laughed at it

The previews I saw were so dumb I could not watch it.

JJ

[kbrewmr2]

The previews I saw were so dumb I could not watch it.

JJ

It uses a little "dumb" to be satirical, yeah, but not overboard imho. Can't judge a book by its cover yadda yadda. No Oscar winner, but...

[AllZWay]

you should - even my curmudgeon parents laughed at it

Absolutely he should.... That move is so full of great one liners. :D

"I am a semi-professional race car driver and amateur tattoo artist."

[ShadowBolt]

Absolutely he should.... That move is so full of great one liners. :D

"I am a semi-professional race car driver and amateur tattoo artist."

I trust James to not put me on some silly BS. I'll watch it.

JJ

[AllZWay]

I trust James to not put me on some silly BS. I'll watch it.

JJ

It is very silly....but so full of great lines to use around the race tracks.

[kbrewmr2]

I'm all hopped up on mountain dew!!!

[michaelmosty]

If you don't chew Big Red then F#$! You!!

[AllZWay]

I am going to scissor kick you in the back of the head.

[marshall_mosty]

Lmao

[Fbody383]

I'll be on you like a spider monkey, Chip!

[AllZWay]

Greatest generation... Only thing you ever done with your life is make a hot daughter.

[BryanL]

It's completely stupid but if you like Will Farrell type of movies it is hilarious. Agreed it is one of the best written movies as far as one liners go-we could go on forever with some many awesome quotes.
"Please be 18"

[Fbody383]

So who has a copy to show on the side of the trailer?

[Tilton]

I have a copy (DVD) and will be up Saturday.

[Fbody383]

I have a copy (DVD) and will be up Saturday. Are you a new guy?

[Tilton]

If I say yes am I eligible for Rookie of the Year again? :)