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Rb25det Manifolds Onto Neo Engine

ptharris

By ptharris,
in Engines & Forced Induction

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ptharris Rookie

ptharris

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Hi guys

After running a big end bearing on my R33 Series 2 25det I have sourced a rebuilt Neo 25det, will my manifolds fit the NEO head? As i have a front facing plenuim and a top mount GT30, LINK G3 so want to use my manifolds and loom on the neo head

Cheers Phil

Please any info would be helpful, as i have to travel 4 hrs to get this engine, Thanks Phil

BH_SLO32 Proficient

BH_SLO32

Posted
Posted
Hi guys

After running a big end bearing on my R33 Series 2 25det I have sourced a rebuilt Neo 25det, will my manifolds fit the NEO head? As i have a front facing plenuim and a top mount GT30, LINK G3 so want to use my manifolds and loom on the neo head

Cheers Phil

I only recently went through this exercise with my fathers R33 series 1 engine which was replaced with a Neo engine. I bolted the intake manifold from the r33 onto the Neo but to do so I had to reuse the 2 studs a either end of the manifold as they are longer on the R33. I also used the thermostat housing from the R33 (larger diameter) but retained the R34 thermostat as it opens at about 82deg as opposed to 76degs on the R33.

You will also need to use the coilpacks, VCT and CAS from the R34 as these are not interchangeable. I had to repin the CAS plug to suit the R34 CAS and wire in a mating plug for the R34 VCT. I used an R33 intake manifold gasket.

I found the motor to be very smooth and great to drive.

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BH_SLO32 Proficient

BH_SLO32

Posted
Posted
I only recently went through this exercise with my fathers R33 series 1 engine which was replaced with a Neo engine. I bolted the intake manifold from the r33 onto the Neo but to do so I had to reuse the 2 studs a either end of the manifold as they are longer on the R33. I also used the thermostat housing from the R33 (larger diameter) but retained the R34 thermostat as it opens at about 82deg as opposed to 76degs on the R33.

You will also need to use the coilpacks, VCT and CAS from the R34 as these are not interchangeable. I had to repin the CAS plug to suit the R34 CAS and wire in a mating plug for the R34 VCT. I used an R33 intake manifold gasket.

I found the motor to be very smooth and great to drive.

A photo of the R33 intake gasket sitting in place on the Neo motor

post-16836-1264046768_thumb.jpg

ptharris Rookie

ptharris

Posted
  • Author
Posted
A photo of the R33 intake gasket sitting in place on the Neo motor

thanks mate!! Whats the difference between the CAS, the Neo engine has the CAS are the plugs different to my loom? Do you have a wiring diagram that you used for the CAS conversion!

I am running wasted spark and using my inlet manifold and loom

Cheers Phil

BH_SLO32 Proficient

BH_SLO32

Posted
Posted
The pins on the CAS sensors will be completely reversed. 1 to 4, 2 to 3, 3 to 2, 4 to 1.

Thank you winstonusmc.

The CAS on the R34 has a different locating piece to the R33 CAS so you cant just swap them over. Same goes for the VCT solenoid (refer photo in my first msg).

The R34 CAS does however share the same connecting plug to the R33.

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