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AFDanHef · 07-26-2018, 07:17 PM

Who all is running S52 cams in their M52 motor?? What valve springs are you using??

I recently read that the S52 uses different (stronger) valve springs because it revs higher and the cam has more lift/duration. That made since to me so I researched a little and according to Realoem.com, the S52 valve spring part number is not used in any m52s except for the E39 528i, which I could assume has a more aggressive cam because it's a 5 series that needs more power. The S52 valve springs are also used in just about every M42/44 engine made. I could assume that the 4 cylinder motors use the stronger springs because they rev higher.

All this said ... Will the stock M52 valve springs hold up under S52 camshafts??

I'm rebuilding my M52 right now, using S52 cams and I would HATE to swallow a valve because I broke a spring!!

Also, valve springs are $15 each!!!!!

$15x24=$360!!!!!

I did NOT expect them to be so expensive!!!!

.... Sooooo let me know if this is the worst idea in the world ... buuuttt I was thinking since the S52 springs are the same as the M44s ... I could go pull 24 of them from the junkyard??

Is that a horrible idea??

07-26-2018, 07:17 PM	#1
AFDanHef Junior Member Join Date: Mar 2017 Location: Riverside, CA Posts: 24 iTrader: (0) Photo Gallery	S52 Cams w/ M52 Valve Springs?? Who all is running S52 cams in their M52 motor?? What valve springs are you using?? I recently read that the S52 uses different (stronger) valve springs because it revs higher and the cam has more lift/duration. That made since to me so I researched a little and according to Realoem.com, the S52 valve spring part number is not used in any m52s except for the E39 528i, which I could assume has a more aggressive cam because it's a 5 series that needs more power. The S52 valve springs are also used in just about every M42/44 engine made. I could assume that the 4 cylinder motors use the stronger springs because they rev higher. All this said ... Will the stock M52 valve springs hold up under S52 camshafts?? I'm rebuilding my M52 right now, using S52 cams and I would HATE to swallow a valve because I broke a spring!! Also, valve springs are $15 each!!!!! $15x24=$360!!!!! I did NOT expect them to be so expensive!!!! .... Sooooo let me know if this is the worst idea in the world ... buuuttt I was thinking since the S52 springs are the same as the M44s ... I could go pull 24 of them from the junkyard?? Is that a horrible idea??