Depends. On Pasha's regrinds which were Riot Racing, his lifters were maxing out so you are right there. However I have regrinds from BimmerHeads and the lifters are not even close to maxing out. It seems Riot Racing just takes way too much off the base circle. I was dumb and didn't measure before sending my cams out so I don't know how much BimmerHeads took off.
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-Alex -
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when I asked bimmerheads about M5x regrinds, I received no response, so I assumed they didn't do them.Originally posted by priapismOriginally posted by shamesonComment
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Pulling this up from the dead. I rarely see anyone talk about Riot Racing reground cams these days, but found a set for sale locally. Since my s52 cams are currently out I figured it would be an easy upgrade. Seeing a prolific tuner claim that the HLAs can adjust for the material removed from the base circle is obviously concerning!
Thoughts?2003 Z4 3.0 6-speed- Silver, 19's, daily driver
1990 Silver 325i- Lowered on H&R OE Sports, e90 drop hats, KYB shocks, color matched rocker panels, 16" Emortal RS wheels on 205/50/16 tires... Currently getting a full refresh including an S52 swap!
1997 Black Ford Probe GT- Stripped to 2220lbs, MS3X, Forged motor in midst of assembly... Dyno results and 1/4 mile times pendingComment
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If the regrind has been done correctly, the lifters can compensate base circle change easily. But the amount of base circle that can be removed is not much. About 1mm. So if the reground cams are advertised to have something like 11mm or more, lift, it's too much and you need to grind the oil feed holes in lifter trays at least.Comment
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I've been told by a couple reputable cam dudes that these cams don't take well to regrinds because they can't get a decent weld on account of being hollow. Maybe some Eddy current/Faraday nonsense?
Despite that, (years ago) I installed a set of regrinds that were based on then unavailable sunbelt race cams on an S52. The vanos had to be shimmed and I think the springs and retainers were swapped out. With a custom tune and turned up to 7200(iirc) it made 292 rwhp on a dynojet.
Once race later upon inspection, the cam lobes were starting to wipe. womp womp.
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Welding the cam lobes is no go. It messes up the hardening of the cam. Regular regrind is fine if not too much material is taken off the base circle.Comment
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ah my bad. I had/have welding and regrinding linked in my mind for whatever reason. Probably in part due to that project; those cams were quite aggressive.Comment
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