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Removal Of Vvti Mechanism On An Rb25det Engine?

Chris Wilson

By Chris Wilson,
in Engines & Forced Induction

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Chris Wilson Proficient

Chris Wilson

Posted
Posted

I am rebuilding an RB25DET engine that has a pair of Apexi hydraulic cams in it. I am putting it on Motec management and would like to remove the VVTi cam mechanism and maybe fit a conventional adjustable cam pulley on the now adjustable cam side. Has anyone done this before, and if so, would they share their experiences please?

Guilt-Toy Grand Master

Guilt-Toy

Posted
Posted
^LOL

Remove VCT cam gear, fit aftermarket cam gear, simple as that.

Just leave the solenoid etc in there and it shall be fine.

You can't. The inlet cam does not have the 4 holes like the exaust cam does and other non vct rb engines.

He will need to replace his inlet cam and then chuck a adjustable cam gear on it

2rismo Grand Master

2rismo

Posted
Posted

Not necessarily. If you buy an off-the-shelf pair of Tomei Poncams cams to suit an RB25DET, the intake cam will NOT have the facility for an adjustable cam gear and will only use one large bolt to retain the factory gear. An RB20DET intake cam with the same specs will fix this issue though.

Not sure about the Apexi cams but they're still hydraulic so there's a chance it wont be as simple as throwing a new gear on.

2rismo Grand Master

2rismo

Posted
Posted

Wait, just re-read the first post. The engine is in bits or about to be, right? Just have a look at the front of the intake cam. Does it have one big bolt or four little ones?

PM-R33 Grand Master

PM-R33

Posted
Posted (edited)
Not necessarily. If you buy an off-the-shelf pair of Tomei Poncams cams to suit an RB25DET, the intake cam will NOT have the facility for an adjustable cam gear and will only use one large bolt to retain the factory gear. An RB20DET intake cam with the same specs will fix this issue though.

Not sure about the Apexi cams but they're still hydraulic so there's a chance it wont be as simple as throwing a new gear on.

Yep correct, however i thought the Apexi Rb25 cams don't retain the VCT and therefore an adjustable cam gear can be fitted. They are pretty rare cams, there's bugger all info about them.

Edited by 2rismo

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