But is this the same technology that Chris is referencing???

 

furthermore, the failed gasket was immediately replaced with the factory stock gasket and nothing else was changed. it's been running great ever since.

the initial install for the cometic phuzion was performed by a porsche factory trained and certified specialist, so the install was not the problem. the problem was the gasket.

 

Nize, you are talking about two different things (I think?)

You mentioned chris had used that technology that had the results in your pictures, however chris white's "new" technology he specifically states he has not tried yet, and is getting his first one later this week.

Not *positive* though.

 

yes. chris and i have had numerous email conversations regarding this, as i was among the first to test this new gasket out and initially ordered it from him. chris is a great guy.

if you ask chris, i'm pretty sure he won't recommend this gasket either.

 

if you read chris' first post, you'll notice it's over one year old. it's been tried and tested since. it failed. it's crap. don't buy it.

 

Oh ok. So the technology is fine, Cometic just did not develop it properly.

 

It didn’t work for Nize, it work for me and a couple of others.
Nize gasket may have had an ‘issue’ since there were problems with the Cometic production machine when it was made. I (and nize) never got a good answer why it didn’t work.
My only issue with the gasket is that it is a one time use and a new set of the gas filled Orings is about the same as the whole gasket. I tend to take things apart (sometimes even just for fun!) and coughing up over $250 for a new head gasket each time doesn’t float my boat.
I would consider using one for very high output race engines where budget isn’t a serious issue.
One other issue – they only come in .060” thickness – this will drop your CR by .25 unless you machine the block or order pistons to match the gasket.

 

Chris,
Doesn't the extra thickness effect quench? What do you recommend for a quench distance?


Rogue

 

So it did work for you and a few others? What was the real price of the gasket? Any water/outside leaking issues? The normal MLSs have had some issues because of an embossment issue last year.

All in all, it looks like these guys have some good ideas, but the material application at an early stage is usually crap.

So 250 for a 4cylinder? 500 bucks for a V-8. Hmm. Maybe not such a great buy.

BUT,

"Phuzion Requirements: Head and Deck surfaces should be within .002” of flatness and have a surface finish of 50RA or finer. The compressed operating thickness of Phuzion is .051”."

Some links for people that made them work ( i know, not conclusive)

http://www.cardomain.com/ride/369587
......

Never mind, can't find anybody else using them, other then another guy on some site saying they are crap, which means as much as the above no-comment parts list - nothing.

If MLS works normally, then I guess I see little reason

 

And if the MLS dosne't work this won't either (the main reason MLS gaskets don't work is lack of flatness/finish on the mounting surfaces).
I still think it is a good concept but it is only (in my opinion) for all out race engines.

 

This concept is not new. This has been around for years, maybe just never offered to the general public as an "off the shelf part". The old DFV had Cooper Seals fitted which are very similar. Many Turbo engines in the 80's had Compression rings fitted around the Cylinder Bores, held in place by the head gasket.

I agree that for the 944 type engines, the MLS is a very good solution and that most applications of this engine are covered by the ability of the MLS gasket.

 

Chris - what surface prep are you using for your MLS installations? What does 50RA look like?

 

Usually I use these on the sleeved blocks so the top of the block has been skimmed and trued. I go for a smooth a finish as possible – the theory used to be that a certain amount a texture was good so that it would ‘bite’ into a head gasket. Most progressive shops now go for a smooth finish – this is especially true with the MLS gaskets. 50ra is not mirror smooth.

An earlier post addressed change the quench clearance – its best to keep this fairly tight. The actual dimension depends on a lot of issues – rod stretch, thermal expansion, piston side clearance (more clearance = more piston rock)

 

Can you explain what quench clearance is?

 

it's how far back the fire rings sit from the edge of the cylinder walls.