??"Neo" straight 6 rb25det?? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

S14Driftn4life · 09-30-2010, 01:38 AM

Doing a RB25 swap in a S14 this winter and in my research ive found the series 1 and 2 RB25's just today i came across a Neo RB25? Does anyone have any info on this motor? The only difference i could see was the valve cover, but it came out of a R32 so is it a series 1 or 2? or is it something else? anything will help.

mrphams · 09-30-2010, 02:35 AM

I thought the NEO RB25s came out of the R34 (non GTR).

They're not a bad motor, but a lot of parts are not compatible with the regular RB25s.

keegans13 · 09-30-2010, 03:11 AM

Solid lifters rather than hydraulic, revised camshafts and a revised inlet manifold. The combustion chamber of the head is smaller, so GT-R spec connecting rods are used to compensate. The turbo received the larger OP6 turbine. Nissan RB engine - Wikipedia, the free encyclopedia

nippon240 · 09-30-2010, 03:13 AM

The RB25det NEO 6 came from the HR34(coupe) and the ER34(sedan). It has like 280 hp rather than the 250 with the S1 and S2 RB25dets. The only Rb25 that came from a R32 was the RB25DE(N/A)

MADE · 09-30-2010, 06:12 AM

Quote:

Originally Posted by keegans13

Solid lifters rather than hydraulic, revised camshafts and a revised inlet manifold. The combustion chamber of the head is smaller, so GT-R spec connecting rods are used to compensate. The turbo received the larger OP6 turbine. Nissan RB engine - Wikipedia, the free encyclopedia

^^ This. On the dyno your going to see at least a 25HP difference between the S1 and the Neo. The NEO is going to be between 240-250 @ the wheels. Only semi down side of the NEO is the parts are not interchangable, finding things like a PFC, Intake mani start to get time consuming and expensive. Depending on what your plans and bank are the S1 or S2 might be your best bet.

09-30-2010, 01:38 AM	#1
S14Driftn4life Join Date: Dec 2009 Location: Chicago S. Subs Age: 35 Posts: 47 Trader Rating: (0) Feedback Score: 0 reviews	??"Neo" straight 6 rb25det?? Doing a RB25 swap in a S14 this winter and in my research ive found the series 1 and 2 RB25's just today i came across a Neo RB25? Does anyone have any info on this motor? The only difference i could see was the valve cover, but it came out of a R32 so is it a series 1 or 2? or is it something else? anything will help.

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09-30-2010, 02:35 AM	#2
mrphams Join Date: Jun 2010 Location: Australia Posts: 27 Trader Rating: (0) Feedback Score: 0 reviews	I thought the NEO RB25s came out of the R34 (non GTR). They're not a bad motor, but a lot of parts are not compatible with the regular RB25s.

09-30-2010, 03:11 AM	#3
keegans13 Join Date: Sep 2010 Location: AZ Posts: 36 Trader Rating: (1) Feedback Score: 1 reviews	Solid lifters rather than hydraulic, revised camshafts and a revised inlet manifold. The combustion chamber of the head is smaller, so GT-R spec connecting rods are used to compensate. The turbo received the larger OP6 turbine. Nissan RB engine - Wikipedia, the free encyclopedia

09-30-2010, 03:13 AM	#4
nippon240 Zilvia Member Join Date: Jun 2009 Location: OZ Posts: 150 Trader Rating: (4) Feedback Score: 4 reviews	The RB25det NEO 6 came from the HR34(coupe) and the ER34(sedan). It has like 280 hp rather than the 250 with the S1 and S2 RB25dets. The only Rb25 that came from a R32 was the RB25DE(N/A)