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R33, Rb25det None Neo To Neo Head Conversion?

r33canada
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r33canada Community Regular

r33canada

Posted
Posted

so i dont know if this has been brought up before and i tried to briefly search to no avail.

i have a 93 r33 s1,

im wondering if its possible or if theres any point to converting to a neo head and whatnot. not a complete engine swap just the head.

is there any point to it?, if so any increase of anything or is it totally stupid and pointless.

im wondering because the neo is suppose to be emission efficient or something like that and here in canada they are anal out the ass about emissions and skylines in general. so if theres a way that its worth it to make them happy and gain any performance then im willing to do it.

thankyou so much for any help

Kranker Collaborator

Kranker

Posted
Posted

dont think they have significantly different blocks, people run both neo heads and hydraulic rb25 heads on RB30 blocks, so i cant see why you couldnt fit one to a non-neo rb25

but dont take my word as gospel, im just taking an guess from i know

if it is possible, then the advantages would be changing from hydraulic lifters to solid lifters (like on a 26), and more modern cyl head design.

but for the cost involved it would probably be just as easy to put an rb26 head on your block

the neo also has smaller combustion chambers than both the rb25 and 26 so you will be raising your compression ratio. so you will probably need to fit some lower comp pistons to get ur comp ratio where you want it.

in my opinion its a bit pointless. yes the neo is a slightly better head but i cant see you gaining a great deal of power or reducing emissions

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