bluez Posted December 27, 2008 Share Posted December 27, 2008 hey guys i have been looking for infor on the rb20/25/26 block height can't find it. Any one knows the height of these blocks thanks. Quote Link to comment Share on other sites More sharing options...
blue72 Posted December 27, 2008 Share Posted December 27, 2008 I haven't found the crank center to top of block height yet either. Let me know if you do. Quote Link to comment Share on other sites More sharing options...
RB26powered74zcar Posted December 27, 2008 Share Posted December 27, 2008 RB20/25/26 188.35mm from what I've found http://www.tomei-p.co.jp/inf/pdf/53_en.pdf Quote Link to comment Share on other sites More sharing options...
bluez Posted December 27, 2008 Author Share Posted December 27, 2008 hey guys thanks, the reason i ask rb24 or rb23- they keep on mention 4agze piston with 20mm pin height. so if i add it rods 121.5+stroke 36.85 or 73.7/2+20mm pin height =178.35 so it would be 188.35-178.35=-10 does this make sense or i am doing it wrong. Quote Link to comment Share on other sites More sharing options...
NZeder Posted December 27, 2008 Share Posted December 27, 2008 hey guys thanks, the reason i ask rb24 or rb23- they keep on mention 4agze piston with 20mm pin height. so if i add it rods 121.5+stroke 36.85 or 73.7/2+20mm pin height =178.35 so it would be 188.35-178.35=-10 does this make sense or i am doing it wrong.Are you sure the 4agze have a 20mm pin height - that seems too low - you could not fit 3 rings into a piston at that pin height without having one of them going around were the pin is ie the oil ring around or below the pin location. I believe a stock 4age has a 20mm pin but the pin height is 30.5mm I believe the 4agze has a lower pin height by 1mm to lower the CR for the supercharger so that makes a 20mm pin with a height of 29.5mm. So the piston needs to have the pin hole increased to 21mm this does seem to tie up with other threads on Skyline websites when googling RB24's So if the pin height is 29.5mm then you get 121.5 + 36.85 + 29.5 = 187.85mm so the piston is below the deck by 0.5mm Quote Link to comment Share on other sites More sharing options...
bluez Posted December 27, 2008 Author Share Posted December 27, 2008 hey thanks i did it wrong, you are right the pin height is 30.5 and i check out other piston to see if it would work and the closes was a b16a turbo piston, the pin diameter 21mm and the height 30.99 or 1.185 and size is 81mm what you think thanks. Quote Link to comment Share on other sites More sharing options...
NZeder Posted December 27, 2008 Share Posted December 27, 2008 hey thanks i did it wrong, you are right the pin height is 30.5 and i check out other piston to see if it would work and the closes was a b16a turbo piston, the pin diameter 21mm and the height 30.99 or 1.185 and size is 81mm what you think thanks. That would put you at postive deck height by my calcs so you will need a thicker head gasket. I would PM Greenmoster80 on this forum as I believe he starting building a RB24DET some time ago - see http://forums.hybridz.org/showthread.php?t=112825&highlight=rb24 If you want to replicate the L24 specs 83mm and 73.7mm (ie RB26 crank) then I think you best look at sleeving a block either a RB20 up or RB25 down as taking a RB20 out from 79 to 83 would leave the wall too thin. Quote Link to comment Share on other sites More sharing options...
Stealth-Z Posted December 27, 2008 Share Posted December 27, 2008 There is a Nissan production RB24 motor in the Philippine export Cefiro. It is supposed to be a RB25 block with an RB20 crank and a RB30SOHC head with a carburator. http://forums.hybridz.org/showthread.php?t=99905&highlight=philippines Might be a better way to go than messing around with the RB20 block. Quote Link to comment Share on other sites More sharing options...
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