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Quote:

Originally Posted by Nick Merrone (Post 1545222)

idk if i use it or what..lmao

Its kind of like a condom...it is up to you if you want to use it or not. Sometimes it helps and other times it doesn't. HAHA

But you are never going to get a straight yes or no answer. Everyone has their own ideas. I know a bunch of people that use it and others that don't. I have never used it because I never had an issue with an mls gasket.

Just like some people would tell me don't use autozone head gaskets on the b series motors, when asked why they would say they are junk b/c they are from autozone. I used them b/c it was cheap and they lasted longer then my motor and heads would. SO......

yeap...i guess im gonna run it..

I dotn use condoms but I use copper spray

Quote:

Originally Posted by 92sileighty (Post 1544887)

really? cometic sucks? every boosted s2k runs that 3mm head gasket. not trying to be a dick, just getting your reason why because i planned on running that gasket.

I'v had them fail on me multiple times on different platforms. DSM's, SR20's, Honda's. They just suck. I built an SR with one and the POS started leaking coolant in the combustion cylinder within 1000miles. The deck surface was perfect, head was perfect. I machined it myself and it was damn near as close as I could get it. They are the only brand I ever had problems with.

I used them only if the customer insisted on being a cheap ass. I would much rather use a HKS, Tomei, APEXI mls gasket.

The two people that clearly stated that cometic HG's are trash (Turbotagteam & evomike) probably have had more wrench time then anybody in this thread so I'd listen to them.

Myself, lurking on dsmtuners, have found cometic to get bad reviews.

but like someone else said in this thread. a lot of this is info is not from personal experience. so if he uses it and something goes wrong with the head gasket he knows it was either his mistake or the head gasket itself... im not taking sides im just being truthful. forums suck for questions sometimes because you get so many opposite answers/opinions.

I don't like cometic, but it will be fine with the spray..... It's a fresh machined head, straight deck engine pussing a whopping 150-160 HP at the crank with a low compression ratio.

This gasket will be mush better then the 30 dollar no name made is Israel POS gasket he got from ebay and wanted to use.

no it came with my other gaskets. lol

I was always under the impression that the both cylinder head and block have to be surfaced to used a MLS gasket or else it can leak.. Not just machined, but surfaced to a VERY smooth finish..

Why not just use an stock headgasket on a bone stock motor?

Quote:

Originally Posted by russiankid (Post 1546984)

Why not just use an stock headgasket on a bone stock motor?

its not bone stock. if you don't have anything positive to say, shut the **** up.

What do you have done to the motor?

Its tuned to run on the blood of Russians. Stalin tuned it.

Quote:

Originally Posted by OutToWinPAHC (Post 1547241)

Its tuned to run on the blood of Russians. Stalin tuned it.

i love you kevin. no homo.

ill repost what i posted before.

Quote:

My contention has always been: You want to have a MHG seal correctly? The RA spec (or smoother) for the specific MHG must be met for both the block and head, the machine work must be precisely flat for both the block and head, and the proper torque spec for the fastener used must be applied in the TRSM sequence. Attention to detail on these is what ensures a proper seal.

I have also said (several times) that the use of a spray sealer (such as Permatex Copper, Brake Quiet, etc.) can damage the fluoroelastomer coating the MHG manufacturers use on their product. However, I've never really backed it up other than a single line in the first article. I decided to research this...first a little background:

Viton (by DuPont) is the most common fluoroelastomer coating; it is used to initiate the initial cold seal on a MHG. It is applied in a very thin layer and is an inert, tough, heat resistant coating. It is one of the more expensive fluoroelastomers out there, and actually is manufactured in four families…the one we are interested in is for automotive applications. It is highly resistant to oil, gasoline, nitro methane, and alcohol. However there are certain chemicals that will affect it. From a tech article on Viton:

“In general, low molecular weight ketones and esters will swell a vulcanizate of Viton and, in fact, ketones such as methyl ethyl ketones are used as solvents for uncured Viton®. Esters such as ethyl acetate are also used as solvents for Viton. The more polar a material the more likely it will swell Viton. Much work is being done in the area of solubility parameters to characterize the swelling behavior of various fluids by comparison of dispersion, hydrogen bonding and dipole parameters to the corresponding parameters of the elastomer.

Amines affect Viton® differently from the ketones and esters. Generally, amines will react with the polymer backbone and result in embrittlement of the vulcanizate. The elongation will drop off significantly and hardness will increase. Amines are just one kind of base. In general, strong bases such as sodium hydroxide at relatively high concentrations will degrade Viton®. In summary, a basic understanding of chemistry is helpful in judging an elastomer's resistance to swelling or degradation.”

Now...the question is are any of these chemicals in a spray sealer? If you read the back of a can of Permatex Copper Spray-a-Gasket, it contains methylene chloride (a simple chlorohydrocarbon), acetone (a ketone), and ethyl acetate (an ester). Take another look at the tech article quote above…since acetone is a ketone, it will attack Viton. I have personally used acetone to clean the old Viton off in order to re-use a MHG. Ethyl acetate is specifically mentioned above as a solvent for Viton...I do believe we have the culprit Dr. Watson! Acetone and ethyl acetate can cause Viton to swell, making its ability to seal very questionable.

The most common counter I hear for using a spray sealer is “I’ve always used it and never had a problem”. That’s fine…use it if you want, but realize that you are applying chemicals that can dissolve the fluoroelastomer coating designed and engineered for the MHG you are using.

I also hear “Cometic says it’s not required, not that it’s not recommended”. Well, I called Cometic and spoke to one of their engineers…his response was “our gaskets do not need additional sealer…we do not recommend using it.” Using a little common sense and knowing how the chemicals in a spray sealer affect Viton, it’s no wonder they do not recommend it. BTW…I couldn’t get HKS to talk to me

Everyone here is free to make their choice. After reading up on the chemistry, I’m not going to use a spray sealer regardless who says it’s ok. Chemistry does not lie...this is not based on hearsay. I’m pretty positive the engineers know what they are doing on this one

Ok so you are going to tell me to shut the **** up because its not a bone stock motor, yet you cannot say what is done to it. From what I read in your journal, you got cams and exhaust.

What you should really be questioning is if you should be using the Cometic gasket. In the DSM world, it's hit or miss with these things. If you haven't decked both the head and block, I'd be extremely weary of using it. I had the OEM MLS gasket which is supposed to seal much better than the cometic and I backed out and bought a composite cause I didn't deck anything. I also hear that the surfaces need to have a smoothness of like 6 microns or something like that. If something needs to be measured for smoothness, that just gives you an idea of how perfect everything needs to be. What benefit is there for using the cometic? I'm boosting 25+psi and approaching 400hp and am doing perfectly fine on the OEM composite gasket.

btw, i use copper spray

Quote:

Originally Posted by russiankid (Post 1547633)

Ok so you are going to tell me to shut the **** up because its not a bone stock motor, yet you cannot say what is done to it. From what I read in your journal, you got cams and exhaust.

hardware too... :P port and polished head.

Quote:

Originally Posted by OutToWinPAHC (Post 1547241)

Its tuned to run on the blood of Russians. Stalin tuned it.

LMFAO :mrgreen::lol: