Jump to content
SAU Community

Recommended Posts

Hi All,
Have a VL NA converted to Turbo, after a thicker head gasket, looking into MLS cometic. 
They come in 1.29mm. 1.89mm and above 2.0mm thickness.

Planning to run hi boost (20psi) any advice would be great.


2.5mm thickness would drop it to nearly 8:4:1 or something like that?

Seems like 1.29mm is default choice for rebuilds?

Leaning towards 1.89mm thickness. What thickness do people mostly use?

Will keep it on 98 octane for now but will eventually go on E85

 

TIA.

25 minutes ago, VL_Turbo said:

Anyone?

Really, after just half an hour?

There is no way that I would want an engine with only 8.4:1. What management are you using? Anything with good management for knock control should have no fear of running at least mid 9s.

Update, changing paths and now going with Nitto 1.1mm with (fire rings) head gasket as opposed to mls cometic 1.29mm gasket.

apparently nitto seals better and have stronger fire rings. 
cometic is good but would require copper spray and wet stone/knife sharpening the block as cometic are very sensitive and my leak compression if not done properly. 

👍

  • Like 1

Good luck telling the difference between the two.

 

Also I seriously doubt the nitto gasket is any more forgiving than another mls gasket. They all need to have the sealing surfaces prepped  properly.

Cometic also recommend installing dry. Not sure why you think they need copper spray, or why the nitto can handle a bad deck surface.

 

 

Cometic make great gaskets. Nitto make great gaskets. That's what I mean.

For a slap together build no way is the head gasket going to be the actual root cause of any failure.

 

  • Like 1

*next post- my engine is making a knocking sound

 

Any decent metal head gasket will do the job. Do Arp head studs and valve springs while the head is off.

Pending turbo sizing, fuel system and condition of engine, bottom end will be the biggest weak point.

On 11/3/2023 at 5:45 PM, robbo_rb180 said:

*next post- my engine is making a knocking sound

 

Any decent metal head gasket will do the job. Do Arp head studs and valve springs while the head is off.

Pending turbo sizing, fuel system and condition of engine, bottom end will be the biggest weak point.

Bought some copper spray today. I also believe it's good to add copper spray for extra safety.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • Oh, also, forgot to add these photos I believe.
    • Thought i'd update on this. I was able to get in contact with Craig Lieberman and later on Darryl Alison (owner of Kaizo Industries). Darryl was able to help me verify that my car was in fact one of theirs and is helping me find more info on mine !
    • There's restrictor pills in the stock boost control hoses. That's how they set the amount that was bled off and hence the "high" boost setting. The usual mod in the day was to remove it and send the "high" boost setting up to about 14 psi.
    • Thanks Duncan, that's the best info I've read. Furthermore after learning about the PCM programming side controlling the factory boost solenoid, the purpose of the solenoid is to "bleed" boost when pin 25 is earthed, thus allowing spring pressure in the wastegate actuator to overcome diaphragm boost pressure, thus closing or reducing the position of the wastegate flap creating more boost as the turbo is able to spin faster. It's pretty cool to see a designated Pill to do exactly this, would have liked to have seen it with a tiny filter over the end for those moments in vacuum.  The constant bleed pill has now been removed completely from the system and solenoid boost control has been restored once again.   Case closed 😂
    • The wideband reading is meaningless if it's not running. Why are you using shitty old sidefeeds on any engine, let alone a Neo? What manifold and fuel rail are you using to achieve that? Beyond that, can't help you with AEM stuff as I've never been their ECU/CAS combo.
×
×
  • Create New...