Best Head gasket - Renault vs Competition MLS

[EVOgone]

Whats the best to use on a competition engine ? mine blown between 1-2 cylinders.......Looks like it had a std one fitted and lasted 2.5years of competition ??????

 

[Dan519]

what engine? F4R headgaskets only go if there's a serious issue elsewhere

 

[EVOgone]

Sorry its a F7R Megane head and Williams bottom end.

12.5cr competition engine, looks like its was a std gasket previously fitted and lasted 2.5year of competition. No sure if to get a Megane or Williams gasket, are they different ?

It blew between 1-2 cylinders and was going between 2-3 aswell.

 

[Chip-mk1]

If both surfaces are skimmed flat, then go for an MLS (cometic or atena etc) but if you are planning on just whacking a gasket in with only a skim of the head not the block (ie leaving engine in car) then you are better off sticking with the standard fibrous one as its more forgiving if there are any imperfections in the clamping distribution from a slightly warped block, but dont expect it to last as long next time if you do that.

 

[EVOgone]

Wasnt planning on taking the engine out and stripping to skim the block. Block looks fine and no distortion (car didnt overheat etc so dont see any reason why it would warp). Was going to skim the head and refit.

Is the Williams and the Megane gasket the same ?

 

[Chip-mk1]

Wasnt planning on taking the engine out and stripping to skim the block. Block looks fine and no distortion (car didnt overheat etc so dont see any reason why it would warp). Was going to skim the head and refit.

Is the Williams and the Megane gasket the same ?

Ah fair enough mate if you are sure its flat, its highly unusual for anyone to blow a headgasket and it not involve some form of overheating (normally a localised hot spot from it blowing between one cylinder and another for example)

If its definately flat, then for a cometic.

As far as I am aware the williams and megane gaskets are the same head gasket, but they might be a different part number due to the inlets being slightly different, TBH its so long since I bought one now that I cant really remember.

 

[EVOgone]

Was looking at the Athena MLS one but 140 quid.!!!

 

[Chip-mk1]

Was looking at the Athena MLS one but 140 quid.!!!

The cometic one is a lot less, only around 90 quid.

 

[EVOgone]

What HG would you use on an F7R engine, Megane head willy bottom end ? are the Meg and Willy Gaskets the same ?

 

[Chip-mk1]

I'd use the cometic for serious use, they are more than upto the job IME on other engines (ive used them at 500bhp+), and I dont believe there is a difference between the two F7R's in terms of head gasket at all, but I have never had anything to do with the megane engines so I am making assumptions there.

 

[EVOgone]

Ordered a WRC spec Athena MLS Gasket, aparently best you can get. Expensive, but a faction vs the cost of the engine.!

 

[Chip-mk1]

Sensible move.