Jump to content
SAU Community

Recommended Posts

Does an rb30 bottom end with rb30 crank bolt straight onto an rb25 head?

Im thinkink of strengthening my bootom end as i am about to put a larger turbo in my car.

Does anyone have some feedback on doing this and also is a ihi apexi rx6 turbo a good upgrade for a gts. I can get a brand new one pretty cheap!!

Link to comment
https://www.sau.com.au/forums/topic/7267-rb30-bottom-end/
Share on other sites

confak,

I'm pretty sure that it does bolt straight on, but that the oil and water galleries need to be moved. I'm sure someone out there knows for sure. The RB30 won't strenthen the bottom end just by putting it on, you'll have to look at doing things to the crank, pistons and conrods to make it tough. The extra 1/2 litre will make a larger turbo more responsive though.

Remember the RB30 was only put into shit cars, VL Turbo etc, so I can't believe that the bottom end will be too stronger, but I haven't tried it.

See'ya

:burnout:

Link to comment
https://www.sau.com.au/forums/topic/7267-rb30-bottom-end/#findComment-107052
Share on other sites

Originally posted by GTS-t VSPEC

Remember the RB30 was only put into shit cars, VL Turbo etc, so I can't believe that the bottom end will be too stronger, but I haven't tried it.

[cough] say what ?!? - the RB30 is used in Oz spec R31 Skylines and Nissan MQ Patrol's. Holden bought the RB30 to put in the VL when they realised the 202 (read: boat anchor) couldn't cut it with unleaded fuel. The bottom end of the RB30 is as strong as any of the RB series.

As for the RB25 head, the non-VCT head bolts straight to the RB30 block without mods, but the VCT head requires oil gallery mods.

Link to comment
https://www.sau.com.au/forums/topic/7267-rb30-bottom-end/#findComment-107174
Share on other sites

only put into shit cars eh. do i detect someone thats been chopped by VL turbos?

R31 = shit car apparently.

SteveL is correct about the non VCT head. This head is found on R32 RB25DE engines (possibly other engines but I dont know)

RB30 bottom end strength: from what i've read the standard bottom end is used regularly in larger hp applications.

Link to comment
https://www.sau.com.au/forums/topic/7267-rb30-bottom-end/#findComment-107207
Share on other sites

As well as bolting the head on, you need to modify the cambelt idler / tensioner, and you need to modify the ignition system (RB25 runs coil packs). And you need a R33 ECU to run the coil packs.

email the boys at Zoom! (zoom@expresspublications.com.au) and ask them which issue covered this conversion.

Link to comment
https://www.sau.com.au/forums/topic/7267-rb30-bottom-end/#findComment-107328
Share on other sites

Now we've started a stupid argument...

Anybody done 400,000km in their RB25 yet ? Hmmmm...when u do let me know, but there are still plenty of R31's driving around that have done that many km using an RB30 engine.

There is a guy on the www.r31skylineclub.com who has a 323kw/rw RB30 turbo (its actually being sold now for 13k - see http://nissanking.cjb.net/).

You might want to check out the r31forums there for some advice, as there are plenty of people who've put Turbo top ends on their RB30's

Link to comment
https://www.sau.com.au/forums/topic/7267-rb30-bottom-end/#findComment-108715
Share on other sites

ok from the research Ihave done.

unless your going for mega power forget the rb 25/30 unless you can do all the work your self.

the rb26 crank and rods fit in the rb25 and get some forged pistons if you want to run serious boost or just use forgies on the stock bottom end.

con b4 you do any thing fit the rx6 turbo but make sure its suitable for the rb25 and yes they are very good turbos.

get a power fc z32 afm and bigger injectors merli is making 280 rwkw on a stock bottom end rb25 so you can and when it blows then fix it strong but it could last for ages. If tuned welkl and looked after

meggala

Link to comment
https://www.sau.com.au/forums/topic/7267-rb30-bottom-end/#findComment-108745
Share on other sites

  • 1 month later...

ricknismo,

http://www.r31skylineclub.com/content/articles

Has a artical on a twincam conversion!

http://home.iprimus.com.au/cobra30/twincam.htm

Is another site detailing the conversion! Costs is also included in this one and it goes into much better explanation on using the non VCT head!

MEGA

Link to comment
https://www.sau.com.au/forums/topic/7267-rb30-bottom-end/#findComment-147590
Share on other sites

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

    • To expand on this to help understanding... The bigger/longer the block is, the more it's going to work to sit on your far away high areas, and not touch the low stuff in the middle. When you throw the guide coat, and give it a quick go with a big block, guide coat will disappear in the high spots. If those high spots are in the correct position where the panel should be, stop sanding, and fill the low spots. However, using a small block, you "fall off" one of the high spots, and now your sanding the "side of the hill". Your little block would have been great for the stone chips, where you only use a very small amount of filler, so you're sanding and area let's say the size of a 5/10cent piece, with something that is 75*150. For the big panel, go bigger!   And now I'll go back to my "body work sucks, it takes too much patience, and I don't have it" PS, I thought your picture with coloured circles was an ultra sound... That's after my brain thought you were trying to make a dick and balls drawing...
    • Oh I probably didn't speak enough about the small sanding block for blocking large areas.  In the video about 3 minutes in, he talks about creating valleys in the panel. This is the issue with using a small sanding block for a large area, it's way too easy to create the valleys he is talking about. With a large block its much easier to create a nice flat surface.  Hard to explain but in practice you'll notice the difference straight away using the large block. 
    • Yep I guessed as much. You'll find life much easier with a large block something like this -  https://wholesalepaint.com.au/products/dura-block-long-hook-loop-sanding-block-100-eva-rubber-af4437 This is a good demo video of something like this in use -    You have turned your small rock chip holes into large low spots. You'll need to fill and block these low spots.  It's always a little hard not seeing it in person, but yes I would go ahead and lay filler over the whole area. Have a good look at the video I linked, it's a very good example of all the things you're doing. They went to bare metal, they are using guide coat, they are doing a skim coat with the filler and blocking it back. If what you're doing doesn't look like what they are doing, that's a big hint for you  
    • The odometer does go up when driving.  Does this tell it is an issue with the speedometer itself?    Where can I look for replacement cluster? Or speedo? I can likely do the repair.. Will ER34 cluster work on HR34? Or do I need a HR34 20GT S2 specifically lol   
    • Mine's a bit bigger at 70x150mm roughly. The spots are flat, just can feel the edges if I dig my nail into it. I did fix some other other ones by both using my finger to sand that small spot (I'm a bit wary of doing this and creating hot spots and a bigger mess) and I also did sand over it flat and others, but this also worried me a bit because if I create an overall low spot on the panel on paint that is good.  Correct me if I'm wrong but as long as it's flat even if I can feel the edges, I can put filler because it will all be level once I sand it? I can see myself going in a circle after sanding guidecoat with 320 grit if for example the panel is flat with my hand but because I sanded the guidecoat I could have created a low spot again somewhere. Unless where I'm going wrong is what I mentioned previously where I didn't go low enough on the grits. It's 1 step forward and 2 step backwards here haha. I'll probably need to experiment with it more. Last time I go back to bare metal lol.
×
×
  • Create New...