Jump to content
SAU Community

Recommended Posts

Hi guys,

i'm going to get off my stock turbo an put on a Garrett GTX3076.

Other mods like FMIC, 600 cc injectors, link g4+, DW fuelpump etc. will be or were already added.

So I took the head off and got it machined to have an even surface. I've cleaned the block with a razorblade to get off the rest of the oem headgasket. The machine shop took off 0.16 mm from the head to get an even surface. The oem gasket thickness is 1.2 mm as I've read, so if I add the 0.16 mm the replacement has to be at least 1.36 mm. Correct?

As I am from Germany, i've searched for a metal headgasket in the local online shops but just found 1.2 or 1.5 mm but no 1.4 or 1.3.

 

So which thickness would you recommend? Or would the oem Nissan gasket be good enough for my setup, keeping in mind that the block was only cleaned by hand?

Ok, thnks for the info. Is this the correct one? https://www.tj-partshop.com/products/13009-Tomei_Headgasket_Zylinderkopfdichtung_Nissan_RB25DET

It is available with 1.2 or 1.5 mm. Which thickness would be the right choice?

The Tomei compression rate calculator says that the oem gasket thckness is 1.1 mm and the compression is 8.97.

With the 1.2 mm gasket the compression rate would be 9.03 and with the 1.5 mm it would be 8.76. 

1 hour ago, GTSBoy said:

How can a thicker gasket increase compression ratio?

I've clculated the compression ratio value for the 1.2 mm including the 0.16 mm of material that the machine shop removed from the head.

When I use the 1.2 mm gasket it will be the same as 1.04 mm gasket with the cylinder head before machining it.

11 hours ago, Finn_GT-T said:

Ok, thnks for the info. Is this the correct one? https://www.tj-partshop.com/products/13009-Tomei_Headgasket_Zylinderkopfdichtung_Nissan_RB25DET

It is available with 1.2 or 1.5 mm. Which thickness would be the right choice?

get 1.2mm

It's 2019 not 1979 where we have shitty ECUs :) 

2 hours ago, AngryRB said:

Just get a stock RB25 head gasket and ARP studs.. 

 

You know a Tomei or Nitto head gasket is much more? Not to mention it's better than the stock composite head gasket.

 

1 hour ago, Dose Pipe Sutututu said:

You know a Tomei or Nitto head gasket is much more? Not to mention it's better than the stock composite head gasket.

 

I know my RB3025 has no issues at 350kw, is a simple oem RB26 gasket that was very reasonable cost from Kudos with ARP studs.. 

If the block surface isnt perfect then it could leak and after pulling engines out a few times recently im over that bullshit so id advice OP to keep it simple.

 

1 minute ago, AngryRB said:

I know my RB3025 has no issues at 350kw, is a simple oem RB26 gasket that was very reasonable cost from Kudos with ARP studs.. 

If the block surface isnt perfect then it could leak and after pulling engines out a few times recently im over that bullshit so id advice OP to keep it simple.

 

You clearly missed what I said earlier about Tomei or Nitto head gaskets ?

How I see it is you've spent that money/time to take off the head and skim it, purchased a larger turbo and going to run ARP studs (over the factory head bolts), then what's an extra $200 to the equation? not much.

Not to mention the Nitto OR Tomei headgasket will seal better and also will withstand the punishment as it's o-ringed. Every car workshop does the same thing. I also got told this advice from both MRC and Billtech (both reputable RB workshops).

I would only advise going with a Cometic or similar style headgasket if your block is prepped.

12 minutes ago, GTSBoy said:

Or perhaps the correct grammar version where you advise against it?

FUUARK - this is proof Asian Males cannot multitask, was typing out an e-mail to a vendor at the same time about "advising" shit too LOLOLOL

(have edited the previous failed post)

Thanks @GTSBoy

 

Thank you all for the replies. This forum is much better than the german equivalent.

ARP studs are already in my garage waiting for me to screw them into the block. I think I'll go for the tomei gasket because of the small extra cost but higher (presumed) reliability compared to the oem gasket.

Will the higher compression ratio be an issue when mapping the link ecu because of the risk of knocking? Keeping in mind that the stock knocksensors will stay in the block.

By the way, what do you think about applying permatex spay gasket to the tomei gasket before assembly? Does it help to get a better sealing, or is it just wasted money?

Edited by Finn_GT-T

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

    • Ha ha ha, that's fair mate! We have the crackhead dogs now. Mainly because the missus wants the crazy dogs while she still has the energy and capacity to be able to keep up with them! Ha ha our current two are both Working GSD, there brothers and sisters (from the same litters) are in Police, Corrective Services, and I believe one did end up in defence force too. They're wild and fun, yet right now, both curled up asleep on the lounge room floor while we watch some TV. Mal is very likely the next dog (unless I get my couch potato guardian dog 😛 )   What are your Kitties names? Are you planning some house work, like those high kitty shelves, built in scratching post, and some cat passages from one room to another room?
    • Maine Coone, did look at but to big and fluffy As for performance dogs, we had Mals at work, performance dogs are fun to watch, but, way to much work for this old rooster
    • Yep, it was only an option on the Q50 Hybrid.  Same in Japan as far as I know. And doesn't use a centre diff like the Suby's do, so not the same as the WRX.  But it also isn't a reactive AWD like other Nissan AWD vehicles are, eg. Murano/Xtrail/etc.
    • You should have got a Maine Coone then. Only thing is they're big. But so cool, and just like a dog. Or, just get yourself a high performance dog. That'll teach you for wanting Parkour indoors 😛
    • Are you thinking of Bens R32? I don't remember if his went through the bonnet itself, but it went through the chassis rail. Brad (RISKIN) bought it, and turned it into a track car. It's funny how anti people are of Jim Berry now. I remember when I pulled mine out (during an engine change) and inspected it and found it cracking badly. At that point in time so many people were even on SAU, were so pro Jim Berry, and that was after Bens GTR exploded his quite publically.
×
×
  • Create New...