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Old 08-10-2009, 10:18 AM   #26
col5555
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Originally Posted by ellissti6 View Post
is it dangerous to use lighter adjustable cam gears? what would be the benefits other than faster acceleration would it be easier on the belt system ?
Less inertia on the valve train. I believe that Subaru went to plastics cam gears for this reason and saved some money in the process.
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Old 08-10-2009, 10:30 AM   #27
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I have a thread (Homemade WRX account) on the issues you'll find with fitting OBX gears.
Forgot to mention that I'm looking to pick up some of the new BC cam gears for testing and fitment. I've been promised that timing is correct this time.
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Old 08-10-2009, 11:50 AM   #28
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are all the adjustable cam gears mentioned in this thread for non AVCS cams only or is there a set for AVCS, at least on the intake cams?
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Old 08-10-2009, 01:32 PM   #29
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^^^AVCS makes the cam adjustable as it is. If you simply want to run an adjustable cam gear (no AVCS usage) on an AVCS cam; simply use a 10-32 tap, 8 x 10-32 set screws and lock-tite and plug the oil holes. Then use a standard adjustable cam gear.
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Old 08-11-2009, 03:05 AM   #30
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as said above

avcs for the inlets(and yes exh avcs for new sti motors..well the 1's there were getting now/soon)

You just buy adj cams wheels for the exhaust side if need be and run the std avcs intake gears.

As for anodizing wearing off and causing belts to jump..that's a big call(and funny),most aftermarket cam gears are made from billet alloy and it anodizing is just a process of coloring(bling)..it is a very very thin layer off coloring and if the wearing down off it was to acure..it would be that slow and that small that it would never cause your belt to jump a tooth...belt tentioner failing will cause that to happen.or damaged belt guides...not anodizing "braking off" or wearing down.

Kris
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Old 08-11-2009, 06:11 AM   #31
col5555
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as said above

avcs for the inlets(and yes exh avcs for new sti motors..well the 1's there were getting now/soon)

You just buy adj cams wheels for the exhaust side if need be and run the std avcs intake gears.

As for anodizing wearing off and causing belts to jump..that's a big call(and funny),most aftermarket cam gears are made from billet alloy and it anodizing is just a process of coloring(bling)..it is a very very thin layer off coloring and if the wearing down off it was to acure..it would be that slow and that small that it would never cause your belt to jump a tooth...belt tentioner failing will cause that to happen.or damaged belt guides...not anodizing "braking off" or wearing down.

Kris
Sorry must have heard wrong. I thought anodizing also actually increase wear resistance. Whenever I have TIG welded anodized parts that coloured oxide layer is a beyuch to scrape off and have to resort to sanding it off with a grinder. There is also different grades of billet and then there is china spec billet.
What I dont like seeing with budget billet type ali pulleys are the indents and compression marks where the bolts clamp.What could cause this.??
In cases where people have installed stronger valve springs could this not accelerate wear?? on the gears above stock pressures.
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Old 08-11-2009, 07:22 AM   #32
sku81
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Quote:
Originally Posted by col5555 View Post
Sorry must have heard wrong. I thought anodizing also actually increase wear resistance. Whenever I have TIG welded anodized parts that coloured oxide layer is a beyuch to scrape off and have to resort to sanding it off with a grinder. There is also different grades of billet and then there is china spec billet.
What I dont like seeing with budget billet type ali pulleys are the indents and compression marks where the bolts clamp.What could cause this.??
In cases where people have installed stronger valve springs could this not accelerate wear?? on the gears above stock pressures.
like welding most metals..remove all foreign mertrials b4 you start to weld.(ie paints and other chemicals)I also agree with half ass grade's off steel and alloy(from most country's..inc china:lol)..you should see the rust on my home air con system out side and its just 3yr old..good old china melted down car bodies. :

as for the wear on the stock gears..Ive striped down EJ20T's with over 300 000 km on the clock and the bore's are fine as well as the valve gear..mostly worn rings,but cam gears are like new,I don't think there is ****e loads of friction between the cam gears and timing belt(not much slip unless belt tentioner is loose or stuffed,Then belt will jump around(have seen this when testing motors)...

As for wear on aftermaket valve train..that come's down to what its been made out off..what steel(or metals) are used(inc springs and cams and what retainers..i dont think it has much to do with cam wheels..the only wear they should get over long period of time is the timing belt running over it..stand cam gears work and run fine for thousands of k's(or mile's for you guys)..and mostly get damaged when ppl hit them.

Kris

Last edited by sku81; 08-11-2009 at 07:30 AM.
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Old 08-19-2009, 05:49 PM   #33
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Originally Posted by ellissti6 View Post
ok i see where you all are coming from i guess no sense in risking an important part like that on an obx brand
I made a mistake of using OBX radiator hoses. Never again.
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