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rb26/rb20 (2.4l) Head hybrid questions.

Nismo_Boy

By Nismo_Boy,
in Engines & Forced Induction

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Angry Proficient

Angry

Posted
Posted

In theory they COULD Flow more ... people would of heard they flow less.. due to the inlet tract butterfly system they have on teh sandwich plate between the inlet runners and cylinder head. match porting them and removing the butterflies and either putting the plate back in place or using the silvertop plenum and inlet runners.. it been seen already a very dramatic increase in torque and response to more boost

EG. FATGTSR .. did this mod recently and went from making 185rwkw - 15psi and 140rwkw - 8psi on nearer max out fuel system to with GTR injectors to 225rwkw - 14psi ( under 12:1 a/f ratio) and 170rwkw - 6psi

thats a shit load of difference. although the fuel system limited it as well as the inlet design as well.

but before u think about dropping redtop on to silvertop etc etc.... the heads are NOT interchangable from redtop to silver and vise versa.. some stud postioning points are different.. they wont line up.. so if i had a silvertop to begin with i wouldnt even think about a swap, would just a pain in the arse. just so that clears that up.

anyways.

Roy? u want my silvertop long motor? :cheers::D

Roy Grand Master

Roy

Posted
Posted

Thanks Angry but i alreday have enough RB20 parts laying around:(

Well the way i look at it, is Nissan went racing with the R31 GTSR, and when they went racing they effectively built the engine that was later used in the R32 GTST, ie what ppl are referring to as the silvertop engine.

So as you said, there is more then just the inlet system that is different between the two RB20 engines, and the fact that when Nissan went racing they used the 6 port silvertop head...well i would have thought it would be a better starting point for an RB20?!?!?!?!?!?!?!?!?

Angry Proficient

Angry

Posted
Posted

fair call .. but i dont think anyone really pushed the redtop motor extensively enough to see how the 12port goes

example ..12port holden blue motor ..... flows better when done right compared to a red motor head. but thats exhaust.. so its probably a bad example.. anyways.

Roy Grand Master

Roy

Posted
Posted

If you need the top part of the plenum then let me know, as i think i have a spare plenum at home in Sydney as well as one in Melbourne. The Sydney one is actually 80% polished:)

Also got the std RB20 ECU and one re-written for the TD06 with GTR injectors

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