04-08-2010
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#1
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flips McGee
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Carbon Build-up causing leaky valve seats on local evos?
So, I now know of four local evo owners that had problems with valve seats/seals. First was chukee, but we're pretty sure that was an ever-so-slightly bent valve. Next was Shawn (DoughtCom), then MattD, and now Trevor. Anyone else want to come forward that's down on power and found a cylinder or three to fail a leakdown test?
When we pulled MattD's head off, I was shocked to find about 1-2mm of carbon build-up on top of his pistons, and a nice good thick frosting of it on all of his valves. His motor had 100k miles on it, but look at this:
So my question is this: is it possible that carbon build-up is causing these leaky valve seats/seals to occur? Imagine a chunk of carbon built up and not letting the valve seat all the way. The only thing that's weird about that, is that you'd think it would get mashed/swept away over time.
Next question: is it worth (or even possible) to use some sort of cleaning product to get rid of all of this build-up?
Options include:
-seafoam
-Mopar CCC
-AMSOil QuickShot SE (Fuel injector cleaner)
-Wynn's Injector Cleaner
People have been swearing by this stuff on evoM:
http://forums.evolutionm.net/vendor-...-services.html
but, since its the exhaust valves in trevor's case, is it even going to hit them?
__________________
Quote:
Originally Posted by Murlo26
I need to listen to Scheides more often i think :)
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Quote:
Originally Posted by turbotalon1g
...I realized that I can't keep up my shit talking without anything to back it up.
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Quote:
Originally Posted by JV
S2000: For those of us that know the Miata is the best car on the planet, but also want extra power and to not have to turn in our man cards.
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04-08-2010
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#2
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R U DTF bro?
Join Date: Aug 2003
Location: Oak Point, TX
Drives: C8 Stingray Z51
Posts: 20,620
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Re: Carbon Build-up causing leaky valve seats on local evos?
MCCC is the shit.
__________________
Quote:
Originally Posted by Murlo26
I agree with Kracka.
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04-08-2010
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#3
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Built it from scratch!
Join Date: Mar 2006
Location: St. Paul
Drives: Currently Mitsu-less
Posts: 851
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Re: Carbon Build-up causing leaky valve seats on local evos?
Wow!
I did the sea foam trick on my DSM a ways back. I don't know if it did any good but it left a huge smoke screen and I don't recommend it if you are still running your cat.
E85?... O wait that causes gummy injectors...
__________________
"A turbo, exhaust gasses go into the turbocharger and spin it, witchcraft happens and you go faster."
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04-08-2010
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#4
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Transmission destroyer
Join Date: Feb 2007
Location: Cambridge
Drives: G37, 91 TSi
Posts: 7,150
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Re: Carbon Build-up causing leaky valve seats on local evos?
E85 has been known to give engines a good cleaning though.
__________________
Quote:
Originally Posted by scheides
I swing from the nuts of cold hard data. Anything less is a guess.
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04-08-2010
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#5
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flips McGee
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Re: Carbon Build-up causing leaky valve seats on local evos?
Trevor has been running E85 for several thousand miles...10k? Idk, i'll let him chime in.
Where would you put the seafoam in this case? In the gas?
What about MCCC, spray it down the spark plug hole, possibly while compressing the valve so it is open, to get the cleaner on the back side of it?
__________________
Quote:
Originally Posted by Murlo26
I need to listen to Scheides more often i think :)
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Quote:
Originally Posted by turbotalon1g
...I realized that I can't keep up my shit talking without anything to back it up.
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Quote:
Originally Posted by JV
S2000: For those of us that know the Miata is the best car on the planet, but also want extra power and to not have to turn in our man cards.
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04-08-2010
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#6
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Shit Rocket Pilot
Join Date: Oct 2003
Location: Shoreview, MN
Drives: 2003 Evolution VIII
Posts: 7,752
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Re: Carbon Build-up causing leaky valve seats on local evos?
The carbon on my pistons came right off with the use of brake cleaner and my fingers. Worked the brake cleaner in with my fingers and then scraped it off with my fingernails. I have no reason to believe that this stuff wouldn't just fall off when the time was right and get stuck on a valve seat. In a couple of the valve recesses on the pistons they were filled in pretty well with carbon, and in that picture you can actually see that the valve hit that carbon.
__________________
"If everything seems under control, you're just not going fast enough." -Mario Andretti
03 Mitsubishi Lancer Evolution VIII
Quote:
Originally Posted by Tachyon
Every minute you spend in your Evo, not in boost, is a minute of your life you'll never get back.
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04-08-2010
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#7
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R U DTF bro?
Join Date: Aug 2003
Location: Oak Point, TX
Drives: C8 Stingray Z51
Posts: 20,620
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Re: Carbon Build-up causing leaky valve seats on local evos?
The only way I've used MCCC is to spray it in the spark plug hole to let it soak on the piston (could do the same with SeaFoam, always change the oil right after this method) or to spray the MCCC into a vacuum line while the engine is running (you'll need to hold the idle around 3k RPM to keep it from dying).
__________________
Quote:
Originally Posted by Murlo26
I agree with Kracka.
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04-08-2010
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#8
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FLOSSEN
Join Date: Apr 2009
Location: Plymouth
Drives: 2011 corolla turbo S
Posts: 764
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Re: Carbon Build-up causing leaky valve seats on local evos?
Got about 13,000 miles with E85.. I think Shane looked at the top of the pistons really quick not sure what he told me about them tho...
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04-08-2010
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#9
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Pewp Champion
Join Date: Nov 2003
Location: Blaine
Drives: Teh Bean
Posts: 12,309
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Re: Carbon Build-up causing leaky valve seats on local evos?
If they look like that, and you're running E85, I wonder if you don't have some kind of oil leak or something else getting in your combustion chamber. I run E85, my cylinders aren't shiney new clean, but pretty clean overall. Nothing like that!
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04-08-2010
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#10
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Join Date: Mar 2005
Location: Blaine, MN
Drives: '91 Automagic
Posts: 13,908
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Re: Carbon Build-up causing leaky valve seats on local evos?
They used to make these one cars, I think collectively they were called DSMs there is even a site with VFAQs on them I am sure one included how to use seafoam and MCCC to clean your engine.
Strange.
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04-08-2010
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#11
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Join Date: Apr 2010
Location: Shakopee
Drives: White on White 98 GSX
Posts: 223
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Re: Carbon Build-up causing leaky valve seats on local evos?
Where is he filling up on E85?
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04-08-2010
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#12
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Shit Rocket Pilot
Join Date: Oct 2003
Location: Shoreview, MN
Drives: 2003 Evolution VIII
Posts: 7,752
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Re: Carbon Build-up causing leaky valve seats on local evos?
Quote:
Originally Posted by Halon
If they look like that, and you're running E85, I wonder if you don't have some kind of oil leak or something else getting in your combustion chamber. I run E85, my cylinders aren't shiney new clean, but pretty clean overall. Nothing like that!
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Guys, the picture above is my car. 100,000 miles on 93 octane. Never a sign of oil leaking, the head gasket looked perfect.
__________________
"If everything seems under control, you're just not going fast enough." -Mario Andretti
03 Mitsubishi Lancer Evolution VIII
Quote:
Originally Posted by Tachyon
Every minute you spend in your Evo, not in boost, is a minute of your life you'll never get back.
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04-08-2010
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#13
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Join Date: Apr 2010
Location: Shakopee
Drives: White on White 98 GSX
Posts: 223
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Re: Carbon Build-up causing leaky valve seats on local evos?
Ok still where do you get your gas from?
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04-08-2010
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#14
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flips McGee
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Re: Carbon Build-up causing leaky valve seats on local evos?
Quote:
Originally Posted by turbotalon1g
They used to make these one cars, I think collectively they were called DSMs there is even a site with VFAQs on them I am sure one included how to use seafoam and MCCC to clean your engine.
Strange.
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Nice :P
http://vfaq.com/mods/MCCC.html
Trev, what do you think, wanna try this?
__________________
Quote:
Originally Posted by Murlo26
I need to listen to Scheides more often i think :)
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Quote:
Originally Posted by turbotalon1g
...I realized that I can't keep up my shit talking without anything to back it up.
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Quote:
Originally Posted by JV
S2000: For those of us that know the Miata is the best car on the planet, but also want extra power and to not have to turn in our man cards.
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04-08-2010
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#15
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Pewp Champion
Join Date: Nov 2003
Location: Blaine
Drives: Teh Bean
Posts: 12,309
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Re: Carbon Build-up causing leaky valve seats on local evos?
Quote:
Originally Posted by Matt D.
Guys, the picture above is my car. 100,000 miles on 93 octane. Never a sign of oil leaking, the head gasket looked perfect.
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Yeah but it sounded like he was saying Trevor's was the same, and he was running e85. Did I interpret wrong?
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04-08-2010
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#16
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FLOSSEN
Join Date: Apr 2009
Location: Plymouth
Drives: 2011 corolla turbo S
Posts: 764
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Re: Carbon Build-up causing leaky valve seats on local evos?
Quote:
Originally Posted by scheides
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Im down! Im going to call Ron tomorrow and see if he will let me borrow his scope you were talking about. Then we could really see in there since its a camera!
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04-08-2010
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#17
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Shit Rocket Pilot
Join Date: Oct 2003
Location: Shoreview, MN
Drives: 2003 Evolution VIII
Posts: 7,752
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Re: Carbon Build-up causing leaky valve seats on local evos?
Quote:
Originally Posted by Halon
Yeah but it sounded like he was saying Trevor's was the same, and he was running e85. Did I interpret wrong?
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Yes because we haven't seen inside Trevor's cylinders yet. Regardless he has an exhaust valve leaking and so far no one has had a burnt or bent valve so that really only leaves us with the carbon buildup option.
Quote:
Originally Posted by RS98GSX
Ok still where do you get your gas from?
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BP mostly unless I don't feel like driving to one and won't be beating on the car then it's whatever 92 octane is nearby.
__________________
"If everything seems under control, you're just not going fast enough." -Mario Andretti
03 Mitsubishi Lancer Evolution VIII
Quote:
Originally Posted by Tachyon
Every minute you spend in your Evo, not in boost, is a minute of your life you'll never get back.
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04-09-2010
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#18
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formerly ecoli
Join Date: Oct 2003
Location: On the dyno
Posts: 4,892
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Re: Carbon Build-up causing leaky valve seats on local evos?
Quote:
Originally Posted by turbotalon1g
They used to make these one cars, I think collectively they were called DSMs there is even a site with VFAQs on them I am sure one included how to use seafoam and MCCC to clean your engine.
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How dare you compare an Evo to a DSM. They share nothing in common! One has 2 doors the other has 4 doors. It's just a coincidence that they pretty much have the same motor, ecu, drivetrain, mas, owners, pistons, rods, cranks, lifters, and rusting problems.
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04-09-2010
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#19
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FLOSSEN
Join Date: Apr 2009
Location: Plymouth
Drives: 2011 corolla turbo S
Posts: 764
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Re: Carbon Build-up causing leaky valve seats on local evos?
I hope this stuff works!
Scheides, Matt D and I will be tryin this out on my car Sunday..
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04-09-2010
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#20
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Join Date: Apr 2010
Location: Shakopee
Drives: White on White 98 GSX
Posts: 223
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Re: Carbon Build-up causing leaky valve seats on local evos?
BP and shell are the best places to fill up. holiday or SA would do that
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