Jump to content
SAU Community

Rb2630 head help

Griffin

By Griffin,
in Engines & Forced Induction

 Share

Recommended Posts

Griffin Experienced

Griffin

Posted
Posted

I'm after help please, I need a head gasket to suit rb26 / rb30.

I'd prefer genuine Nissan but can't get any from Nissan parts. 

The only options are mls gaskets or durapro.

NOT using an mls gasket. Are the durapro any good or does anyone have a Nissan one for sale?

The block is a low km rb30 and the head is from r34 GT-R rb26. How do I tell how much has been machined from the face? Are there marks on the head to use as a reference.

I know it's been surfaced previously. Also the more compression I can get the better. There is a .8 mm durapro gasket available . Does that sound correct?

Link to comment
https://www.sau.com.au/forums/topic/472248-rb2630-head-help/
Share on other sites
iruvyouskyrine Grand Master

iruvyouskyrine

Posted
Posted

Don't have to go into it if you don't want but why do you not want a MLS gasket? And why is it you think you can't get parts from Nissan? They have a warehouse in Sydney and I'm very sure you would be able to get an RB30 gasket from them.

Places like repco would also have standard fibrous non-MLS gaskets in stock for RB30

GTSBoy Grand Master

GTSBoy

Posted
Posted (edited)
  1. Turn it upside down.  (make sure that there's a spark plug and the valves in one chamber but without springs)
  2. Make it level.
  3. Coat the back of the valves in one chamber with vaseline.
  4. Put a light smear of vaseline around the head face around that chamber.
  5. Place a sheet of clear perspex/acrylic with a 10mm hole in the middle of it over the chamber.
  6. Set up the burette in a retort stand over the hole in the acrylic sheet.
  7. Fill burette with water.
  8. Titrate water into the chamber until it just fills the chamber, leaving no bubbles against the acrylic sheet.  May have to wiggle the head a little to encourage the bubbles to come to the hole in the centre.  Do not fill until the hole in the centre is full.  Fill until the meniscus of the water is just into the bottom of the hole.
    1. The chamber volume will be more than the capacity of a 50cc burette.  So run 50cc in, then refill the burette and run the rest in.  Add the total volume.
    2. If you do not have a burette and can get hold of some decently accurate syringes, you can use those.  Not as precise as using a burette.
  9. When you have the total volume of water that went into the chamber, you can calculate the chamber height difference required to give you this answer instead of the well know "stock" chamber volume for the head in question.
    1. Get the diameter of the chamber at the head face and calculate the cross sectional area.  If the chamber is not round, then you will have to work out the cross sectional area via other means.  Putting ink onto the head face and making a print of the chamber could be the first step that would allow yo to use precise scales or a scanner and some software or any of a range of other techniques to get the cross sectional area.
    2. The cross sectional area, multiplied by a small vertical distance, will give you a volume equal to the missing chamber volume.  This might be as little as 0.1mm or it might be 1mm, or any other number.  Either do it via trial and error or rearrange the equations to solve for the height difference exactly.
Edited by GTSBoy
Komdotkom Rising Star

Komdotkom

Posted
Posted

http://justjap.com/manufacturers/oem/332/534/genuine-nissan-head-gasket-nissan-rb26dett.html

or $51US on Amayama for a genuine RB26 gasket.

 

I agree with no MLS gasket if you can't be certain of the RA on the block deck.

Are you worried about PTV clearance or static compression? I wouldn't worry too much about the static comp, dummy assemble and measure the crown clearance with pasticine to work out PTV and your cam timing options.

Griffin Experienced

Griffin

Posted
  • Author
Posted

Just Jap don't have them in stock and don't know when they will be. 

Nissan have zero listed in the country.

I managed to find an old stock vl vrs kit locally for $80 . Pick up tomorrow.

I was more curious how much meat has been skimmed off my head. 

Thanks guys for input on working out compression. 

It's going in this old banger I picked up. Aiming for 350rwkw with bits I have laying around

IMG_20170831_115657952.thumb.jpg.0719676e2a13831942dd27e5cb202bd2.jpg

  • 2 weeks later...
Griffin Experienced

Griffin

Posted
  • Author
Posted

I'm just assembling the timing belt and not sure about the belt tension.

It seems taught enough without any load on the tensioner. It seemed as though the belt could of been a tooth longer as it wasn't easy to get on. ( Using gates 152 tooth belt.)

The timing marks line up, belt seems tight enough. Should I tighten the tensioner as is or get more load.

Is this common? Will the belt free a little now it's under load? 

I've attached pics if anyone can assist.IMG_20171019_164903677.thumb.jpg.b0c4cc37479f453d9bc1793b2970e059.jpgIMG_20171019_164857288.thumb.jpg.727b107a8fdaa2fe4c891719776c70b5.jpgIMG_20171019_164930551.thumb.jpg.146b4ddac162d7c6b80023c772e352a4.jpgIMG_20171019_164909189.thumb.jpg.e438e4f5c35d191993e413cb87565c1d.jpg

 

iruvyouskyrine Grand Master

iruvyouskyrine

Posted
Posted

Impossible to tell from photos. It all depends on where the tensioner stud is tapped into the block as to how hard the belt it so get on. On my car its pretty tight a to get the belt on and doesn't require much tension adjustment to get it to correct. I have done heaps of timing belts and my rough gauge is you shouldn't be able to turn it more than 45 degrees with a decent amount of hand pressure line in your pic.

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
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • PranK
      My BMW E39 528i touring

      By PranK · Posted

      Thanks for that, I'll check it all out. I can always do the brakes last anyway if its a problem.  The 16's are super cool, if they do fit I'll cruise around with them for a bit.  
    • GTSBoy
      My BMW E39 528i touring

      By GTSBoy · Posted

      Well, that's kinda the point. The calipers might interfere with the inside of the barrels 16" rims are only about 14" inside the barrels, which is ~350mm, and 334mm rotors only leave about 8mm outboard for the caliper before you get to 350, And.... that;s not gunna be enough. If the rims have a larger ID than that, you might sneak it in. I'd be putting a measuring stick inside the wheel and eyeballing the extra required for the caliper outboard of the rotor before committing to bolting it all on.
    • Duncan
      Neil's R33 Gts-t Build

      By Duncan · Posted

      OK, so again it has been a bit of a break but it was around researching what had been done since I didn't have access to Neil's records and not everything is obvious without pulling stuff apart. Happily the guy who assembled the engine had kept reasonable records, so we now know the final spec is: Bottom end: Standard block and crank Ross 86.5mm forgies, 9:1 compression Spool forged rods Standard main bolts Oil pump Spool billet gears in standard housing Aeroflow extended and baffled sump Head Freshly rebuilt standard head with new 80lb valve springs Mild porting/port match Head oil feed restrictor VCT disabled Tighe 805C reground cams (255 duration, 8.93 lift)  Adjustable cam gears on inlet/exhaust Standard head bolts, gasket not confirmed but assumed MLS External 555cc Nismo injectors Z32 AFM Bosch 023 Intank fuel pump Garret 2871 (factory housings and manifold) Hypertune FFP plenum with standard throttle   Time to book in a trip to Unigroup
    • PranK
      My BMW E39 528i touring

      By PranK · Posted

      I forgot about my shiny new plates!
    • PranK
      My BMW E39 528i touring

      By PranK · Posted

      Well, apparently they do fit, however this wont be a problem if not because the car will be stationary while i do the suspension work. I was just going to use the 16's to roll the old girl around if I needed to. I just need to get the E90 back on the road first. Yes! I'm a believer! 🙌 So, I contacted them because the site kinda sucks and I was really confused about what I'd need. They put together a package for me and because I was spraying all the seat surfaces and not doing spot fixes I decided not to send them a headrest to colour match, I just used their colour on file (and it was spot on).  I got some heavy duty cleaner, 1L of colour, a small bottle of dye hardener and a small bottle of the dye top coat. I also got a spray gun as I needed a larger nozzle than the gun I had and it was only $40 extra. From memory the total was ~$450 ish. Its not cheap but the result is awesome. They did add repair bits and pieces to the quote originally and the cost came down significantly when I said I didn't need any repair products. I did it over a weekend. The only issues I had were my own; I forgot to mix the hardener into the dye two coats but I had enough dye for 2 more coats with the hardener. I also just used up all the dye because why not and i rushed the last coat which gave me some runs. Thankfully the runs are under the headrests. The gun pattern wasn't great, very round and would have been better if it was a line. It made it a little tricky to get consistent coverage and I think having done the extra coats probably helped conceal any coverage issues. I contacted them again a few months later so I could get our X5 done (who the f**k thought white leather was a good idea for a family car?!) and they said they had some training to do in Sydney and I could get a reduced rate on the leather fix in the X5 if I let them demo their product on our car. So I agreed. When I took Bec in the E39 to pick it up, I showed them the job I'd done in my car and they were all (students included) really impressed. Note that they said the runs I created could be fixed easily at the time with a brush or an air compressor gun. So, now with the two cars done I can absolutely recommend Colourlock.  I'll take pics of both interiors and create a new thread.
×
×
  • Create New...