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How Do I Install Tomei Poncams Into Rb25?

christo76

By christo76,
in Engines & Forced Induction

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christo76 Apprentice

christo76

Posted
Posted

Hi,

Looking for some help with cams... I've just bolted up a GT3076 A/R 0.6 with internal gate to my RB25 series 1 and I have a pair of Tomei Poncams 256 degree 8.5mm lift I would like to drop in. I'm not looking to get any real power gains from them, but just to move the powerband round, for more response and and earlier spool up, would these cams be adequate for the job? The cams came with the option VCT retained, what is this about and is there any tutorials or DIY's on instalment of these cams?

christo76 Apprentice

christo76

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Posted

The job itself is fairly straight forward if you have good mechanical skills. Download the RB25 engine manual and there is a section that covers cam swaps. Just follow that.

I see your located in Townsville.. Any good tuners you could recommend?

NSNPWR Rising Star

NSNPWR

Posted
Posted (edited)

I fit Tomei Type-B's to my 26 a little while ago.

Some things you might like to know...despite what others might say, I got the motor to TDC and zip tied the cam gears to the belt, the gears are a little tricky to get back on doing it this way when reassembling but its def do-able. Removing and reinstalling the cams is easy enough, just unbolt the caps in the factory sequence and do the same when refitting, be very careful when retorqueing the cam cap bolts and use a small 1/4 Drive inch/lb torque wrench or similar, they are piddly little 6mm bolts and are very easy to over torque and snap!...You will likely need to replace the cam seals, its worth doing if they havent been done even if you get them off without damaging them at all. Use sufficient assembly lube on the cam lobes, lifters etc.

If youre not at all mechanically minded, I wouldnt take this on yourself, you'll need a timing light etc once youre done to check timing. Good luck.

Edited by NSNPWR
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boostn0199 Grand Master

boostn0199

Posted
Posted

Yeah I would recomend winding it back abit from top dead centre that way theres no chance of the valves hitting cylinder 1 or 6 as they can be abit tricky to keep straight when putting the first few cam brackets on. Doing the springs would be a good idea to save you from having to open it up again.

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