joker81 Posted January 2, 2016 Share Posted January 2, 2016 Happy New Year everybody I've been thinking about swapping an RB25DE into my 72 Z for quite a while now. There isn't all that much info out there, the reason I want to go NA with the RB is so I can have some ITB's at some point. Has anyone on here done this? Quote Link to comment Share on other sites More sharing options...
Ereschkigal Posted January 2, 2016 Share Posted January 2, 2016 (edited) I believe the RB26 has ITBs stock and there are swap kits for the RBs like mckinneymotorsports Edited January 2, 2016 by Ereschkigal Quote Link to comment Share on other sites More sharing options...
winstonusmc Posted January 2, 2016 Share Posted January 2, 2016 I have run an RB25DE with ITBs. It was the R32 version due to its lack of variable cam timing. This made the RB26 head bolt on. I ran the same Megasquirt that's on my L28ET in ITB fueling mode. Look up my YouTube channel under the same name and watch the vids. This engine is about to go into my 240z after I return from Christmas Vacation. Fun Fact: it was the second engine ever to be run on the RB setting in Megasquirt, first was my Skyline. I worked with James Murray to get the settings correct back in 2012. Quote Link to comment Share on other sites More sharing options...
joker81 Posted January 2, 2016 Author Share Posted January 2, 2016 Sounds amazing! So basically to make this work, I need an RB26 head with RB25 block? How is the power? I mostly want to do this to be fuel injected but still have it sound like it's carberated. Anybody have the parts I need for sale hehe. Quote Link to comment Share on other sites More sharing options...
~KnuckleDuster~ Posted January 3, 2016 Share Posted January 3, 2016 This engine is about to go into my 240z after I return from Christmas Vacation. Quote Link to comment Share on other sites More sharing options...
winstonusmc Posted January 3, 2016 Share Posted January 3, 2016 (edited) The RB26 head doesn't bolt too well to the more popular R33 version RB25DE due to the front oil passage for the variable cam. It changes the shape of the front coolant passage. It kinda has to be RTV'd to get it to seal properly. I used the early version because the top of the block is identical to the RB26. Good luck finding one of those here in the US though. I bought mine while station in Japan. Using the RB26 head does make some minor concerns with the header due to its different flange pattern. There are examples of modifying the stock RB25 intake for ITB if you know a good aluminum welder. Edited January 3, 2016 by winstonusmc Quote Link to comment Share on other sites More sharing options...
~KnuckleDuster~ Posted January 3, 2016 Share Posted January 3, 2016 (edited) Finding any n/a rb motor for sale in general seems like a hard task lately. Matt, what made you decide to go away from the turbo L series? Are you still keeping that motor around? Edited January 3, 2016 by ~KnuckleDuster~ Quote Link to comment Share on other sites More sharing options...
winstonusmc Posted January 3, 2016 Share Posted January 3, 2016 Someone wants to buy it, and I ultimately want to sell the NA and get a turbo RB. Can't sell the NA until I break it in. It's a fresh assembly. Quote Link to comment Share on other sites More sharing options...
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