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Anyone Had Problems With Alloy Adjustable Cam-gears?

wlspn

By wlspn,
in Engines & Forced Induction

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wlspn Proficient

wlspn

Posted
Posted

Just purchased an adjustable exhaust cam-gear for my RB25 from Access Autoworks.

It looked like it used an alloy adjustable centre with steel outer gear but when I received it (a family member picked it up for me) I realised the outer gear is also alloy. I have heard some stories about alloy gears wearing & allowing the belt to slip but am wondering if this is a common thing or something that happened once & got spread all over the net? If anyone has had this happen (firsthand or to a mate, etc) how long did the alloy gear last?

Access Auto give a 12-month guarantee so I assume it will last at least a year...

It looked like the inner adjustable part of the new gear would fit in the original steel gear so I have gone ahead today & removed the timing belt & cam-gear, however it missed out on fitting by .7 of a mm (Damn close!) so some machining is needed.

I can take the original gear to work & machine it on the lathe to fit the adjustable centre but wont be able to do that until at least Monday (if I'm lucky) & need car running by Tuesday night as its booked in for tuning Wednesday.

Thinking of running the alloy gear for now, modifying the original ready & periodically (during service, etc) checking the alloy gear for wear.

Then if I need to replace it or if I can just be arsed one day will swap everything back over. It is a bit of a bugger of a job to do twice but!

Basically just after opinions of people who have used them how bad the alloy gears really are...

scotty nm35 Grand Master

scotty nm35

Posted
Posted

The anodising is stronger than steel, that's why alloy motorbike rear sprockets last so long. Once the ano wears off they will quickly chew out but i'm guessing that wont happen while you own the car. They could be damaged easier than steel if the belt isnt in good nick.

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