Jump to content
SAU Community

Blown Gasket On Rb26 - What Parts To Get To Strengthened While Im At It?


Recommended Posts

Hey guys, i just blew the head gasket in my rb26 engine (r33 gtr), im going to get it all rebuilt and was wondering the best parts to get while it's all out?, thinking of strengthening everything i can...im after a strong street car able to handle close to 650hp.....

what size/type gasket to get, and also other things to buy at the same time while its all out?, maybe rod bolts etc.....whats the good stuff to buy for these engines to make them way more reliable for the street(daily driven)

cheers.

HKS Metal head gasket, or if you're going for a full build for 650hp, try this (all prices from greenline):

TOMEI Forged Piston Kit 86.5mm - $1420

Argo Forged Conrods - $1100

TOMEI Poncam Camshaft and Pulley Kit Type B - $900

TRUST Timing Belt Cover - $75

TOMEI Gasket Kit 87mm 8.6 comp - $380

TRUST Oil Pan Upgrade Kit - $370

TOMEI Conrod bearings - $210

Valve guides - $400

Head service - $450

Pressure test - $55

Remove and resit vavle guides - $240

Will be more if you need oil/water pumps and more extensive headwork.

Edited by Brockaz

Cheers mate, im pricing up everything right now, im thinking of doing it all right the first time.....what headgaskets are good for street rb26dett, that are strong for up to 600hp max....i think that would be my goal - 500-600hp max and for street, responsive car. Theres so many different sizes for the headgaskets, and i guess the forged pistons will have to match this size too? or not??? Wanting to order everything asap as i need the kit fast.

Yes if you go for oversized pistons, say 86.5mm, you will need an 87mm bore head gasket.

Head gasket choice will be affected by piston choice.

If you go for tomei 86.5mm pistons, go for a tomei 87mm head gasket.

if you go for HKS 87mm pistons, go for a HKS 87.5mm head gasket.

I'd chose both 1.2mm thick.

Thanks:), manage to do half of it today - will be finishing the second half tommorow, and get it taken to specialists to check the head for cracks, warped head etc....

Can i check the bore size using like a vernadial? - so basically .5mm difference in gasket size is alright to do(so long as it's .5mm increase?), and do i need to seal the gasket with anything, ive been searching the forums, alot of people say metal head gaskets don't need to be sealed with any sort of sealant, others reccomend it be done....

P.S: I have wiseco pistons already (as per the rebuild notes - i will confirm this tommorow when head is apart though)...

Question ive been dying to ask, and one that i had removed not so long ago when posting a thread(even though io searched alot of times)....

What is the stock rb26 compression ratio and gasket thickness?....

And why would i go say 1.2mm over say 1mm? - for a car aiming not for high hp, but street response and around the 300awkw-320awkw maybe down the line max...what compression ratio would suit?.

Either way im really thinking of going the 1.2mm route now anyways, after searching miliions of threads on this topic:)

Thanks for all the help!

Edited by nsta

Hey - the tomei head gasket kit comes with a oil restrictor gallery orifice.....is this something that the specialists needs to do when dissembling the head - or something that i could do myself when putting the mototr back together once the heads been tested/repaired?

Head nearly off - intake side all done, just oding the last bits of the exh side tommorow - do the turbos need to come off to remove the head?, or could we get away with removing the exh manifolds from the turbos and leave the turbos intact?

Also, i had a very hard time with the Oil/water feed lines on the exh side, as whoever tightened the nuts last, done them extremely tight!!!, we ended up having to pull the whole feed out from around the back of the head....in the process the lines had bent abit, but i assume we can bend them back into shape and all is ok? other than that no real dramas.

Thanks.

You will need to completely strip it anyway to get it cleaned, checked and bored. My advice is get a couple of cardboard boxes and put the head stuff in 1, exhaust in 1, intake in 1 and front stuff in another box.

It took me approx 5hrs to do the top and sides and half the front. Considering I have no idea what most of the parts are and I had to go and buy some tools to get afew bolts undone I was happy with the effort (and saved money at the same time).

Hahah im in the same boat, just going bit by bit trying to figure it all out one by one - not that hard so long as i make sure i do i go by manual - and do it all by the book i guess.....timing belt may be something ill take my time to do.

thanks.

hi mate, my old 26 was 620bhp @ the fly. homebuilt here is the spec.

block bored to suit cp forged pistons, std rods,

std crank acl bearings, n1 oil/wtaer pumps.

hks 25/30,s @ 1.5 bar tomei turbo elbows, decat 3.5" full system

720ccinj, tomei in tank pump, hks fuel adj reg.

1.2mm tomei headgasket and restrictor fitted

jun stage one cams 264/272 9.7mm lift.

apexi power fc d-jetro

made 612bhp and 450lbs @ the fly

hope that helps.

p.s std rods are good for 650bhp tops.

Edited by rockabilly

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

    • So, I started this repair and got as far as "fixing" the holes with some fibreglass. God all those years working on boats came back quickly. I decided I'd reach out to some rust guys just to see what they would say about it. I came across a guy about 40 mins away and went to see him. He said the windscreen needs to come out, that there might be some more bits around the windscreen and he'd quote them at the time. But his quote was $300 to remove and replace windscreen and $3k for the damage he can see. He said he could respray the roof for $1200 and the bonnet for another $800 (somebody has previously rattle canned it, its horrendous). This is $5300 + any small additional bits. It's a lot, I get that and the name of one of my fave youtube channels 'Not Economically Viable' comes to mind.  I'm not being financially rational, but I've taken him up on the quote. He's opening a new shop in November with more room, so we're waiting for that. I'll leave the currently missing headliner out until then. I'm looking forward to it being fixed and having the paint looking nice again (lots of clear coat issues on the roof too). / flame suit on.
    • Oh and some up-and-comings; New rear drivers wheel bearing. I'll do that this weekend while the diff is out. The car is already up and the d/c axles and missing exhaust will help with space. This is the last bearing for me to do and I've been dragging my feet on it. I also have some new EBC blue stuff pads for the car and some new brake fluid. I haven't ever flushed the fluid in this car and looking forward to it. I have 600 degree fluid to put in. Not exactly "race fluid" but better than the typical stuff I have been using.
    • A proper clutch/plate type mechanical diff with quite a lot of pre-load and high locking % is better for drifting. Much more consistent in its behaviour. A helical can be annoyingly vague and inconsistent in how it responds under the sorts of abuse found in drifting.
    • Some updates here. I pulled the entire interior out, minus some trim to respray the seats with Colourlock dye. It turned out really nice though I accidentally let the dog in the car after and she scratched up the front seat.  This is what it looked like before, the colour was just washing out everywhere but thankfully the leather was in good nic. Then after the respray   And after the bloody dog jumped in The headliner is out waiting to be retrimmed, but it will stay out now until Nov - see why below. I replaced the stereo/headunit with a period-styled Android headunit. I have no after pics, but I'll get some. This is because of the missing pixels. I tried to fix this twice with replacement ribbon cables but couldn't. Also the bluetooth interface I'd bought for this was crap. Then there's the rusty roof. Pics and info in this other thread. I have decided to get this repaired professionally, but I'll update that thread. This is why the headliner will stay out for now. I'll be getting the roof and bonnet resprayed at the same time the rust is fixed. I also had an interesting issue with my drivers door lock.  For a small period I was having issues getting any 12v power to the car - I mean *any*. It would have no dash lights, nothing. It happened while I was at the shops and I couldn't get in the car. So, we had 2 problems. The most pressing here is that I was locked out. I have only a single physical key hole on the car, the drivers door and no amount of turning would unlock the car. Surely it doesn't need power for this? The second issue is why am I losing all power periodically, The battery isn't dead, its almost like the battery isn't even there. Two issues that were surprisingly easy to fix. You fellow BMW over-engineering lovers will appreciate this. The lock in the door has 5 states; mechanical lock, electric lock, neutral, electric unlock, mechanical unlock achieved at -90 degrees, -45 degrees, 0 degrees, 45 degrees and 90 degrees. Although, the unlock is towards the front of the car, so opposite for LHD countries. Sticking the key in and turning 45 left or right is what is used 99% of the time. It activates the central locking etc. 90 degrees is for dead battery access and, obvs, only un/locks the one door. But because the mechanical lock is never used and is 27 years old, it seizes up. I was totally unable to turn the key far enough to get to the mechanical unlock (At the time of locking myself out, I didn't even know this was a thing). I eventually did it with some vicegrips and teflon spray.  I made a quick vid for other E39 peeps.   The battery issue is totally new to me also - It wasn't making sufficient contact between the post and the terminal. The terminal was bolted on tight, but the car wouldn't have power. After checking the battery with my multimeter I accidentally contacted the terminal and the battery post and the car got power. The battery was only a few years old and in good condition. I cleaned the post and the terminal with a wire brush, bolted it back on tight and never had the issue again. I'm still surprised that despite having solid contact it didn't work. Also, the car was getting Warragamba sized pools of water in the back when it rained. My initial concern was another rust problem. But when I went out on Weds while it was raining and while I had no headliner in I could see a steady stream of water coming through the roof mounted aerial. As this aerial is for the (now removed) car phone I pulled it out and whacked a blanking grommet in the hole. It seems fine now. I'm thinking I might get the hole permanently filled when the rust is fixed. Moving forward and things in progress; The tailgate needs some attention. I have taken all the trim off to clean it all and address some small rust spots. I have partially done all of this but I'll finish it up hopefully this weekend. As all the trim are now entirely devoid of trim clips I have bought a heap of strong velcro and I'm hoping it does a good enough job as any of this trim in good condition is super expensive and usually in Europe as we dont have many of the wagons here. Suspension and brakes!!! This is exciting. In the front; New control arms New sway bar links New lower Eibach springs (the only modification I'm planning on this car) M Sport shocks (these came with the car and will replace the longer shocks in the car) New top mounts Used 540i calipers (stock brakes suck!) New 540i disks and pads (22x296 mm for 528 and 30x334 mm for 540i) New front wheel bearings (thank all that is holy for bolt on bearings!) Annnnd in the back; New control arms New sway bar links Adjustable air suspension arms (fool the car into what the current height is so the self levelling suspension can match the new front ride height) New ball joints I'll also be doing a brake fluid flush while I'm in there. I'm planning on switching the car over to the 16's that came with it so I can clean up and respray the M Sport 17's. They've lost a lot of colour over the years and have some gutter rash. None of this will start until the E90 is back.
    • You mean you will regret it for drifting duties? I don't quite follow.
×
×
  • Create New...