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Curious cam timing.

LWO

By LWO,
in Engines & Forced Induction

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LWO Collaborator

LWO

Posted
Posted

Long time reader.... first time pulling one apart.  

 

I am giving the GTR a birthday with new timing belt (and braces).  I was told car had HKS 264 cams and under the covers there are cams stamped with "HKS" but no other markings ("RB2" is cast into the blanks).  Curiously, the inlet cam (greddy cam sprockets) is set to 10deg advanced and exhaust is set straight up.  As I dont have a long nose dial indicator to hand and I am lazy, is it conceivable that someone (who knows what they are doing) would end up with these settings on a dyno?  I was thinking of returning them to typical +4/-2.  Car has R34 N1 turbos that I want to run about 20psi.

 

Thanks Lincoln. 

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Dale FZ1 Veteran

Dale FZ1

Posted
Posted

Quite possibly someone did know what they were doing.

If you're feeling lazy, find the cash to pay someone with the dial indicator gear to investigate.  Determine what the cams actually are, and decide whether you want/need to adjust from where they are.

Dan_J Veteran

Dan_J

Posted
Posted

well generally adjustable cam gear settings play with the powerband of an engine.

when i played around with my rb20 i advanced intake and retarded exhaust, done in incremental adjustments with full boost test runs to find the sweet spot, i found i would hit full boost earlier in the rpm range, however i figure i was robbing top end power

Note: make sure you at least have a wideband sensor or is run on a dyno for such adjustments so u don't lean out and blow your engine 

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