Noob Move, broke my reground S52 intake cam

[broach328]

I was referring to the nice torque wrenches that do torque angles as well... The reason I dont have that socket is mainly because when I did the head job I didnt want to wait on it in the mail so I pulled the head with the cams out. Wasn't really about the money especially considering 25 dollars is minuscule in comparison to rebuilding a cylinder head.

[bmwguy325is]

Have you tried JB weld yet?

[DesertBMW]

Because I don't want to weld them. They are already hard and brittle, welding we weaken them even more and make them more prone to breaking. Most reputable shops won't weld them because of this.

I could regrind a set of m52 cams ground to s52 specs.

Makes no sense what you are saying. They have to weld on material to the S52 cams also, so if you do it to M52 cams it is the same cost. They weld more material to the lobes of the cams then grind them to more aggressive profile.

[broach328]

Have you tried JB weld yet?

cant believe nobody thought of that yet.

[BenM]

Makes no sense what you are saying. They have to weld on material to the S52 cams also, so if you do it to M52 cams it is the same cost. They weld more material to the lobes of the cams then grind them to more aggressive profile.

Makes plenty of sense to me, I don't want to have the cams welded. Most places reduce the base circle and don't have to weld any material onto them to make a more aggressive profile. By doing that, the "heel" of the cam lobe becomes the baseline for the closed valve. In M5X/S5X, the hydraulic lifters take up the extra slack.

Who do you use for your "cam welding and regrinding"?

[DesertBMW]

Makes plenty of sense to me, I don't want to have the cams welded. Most places reduce the base circle and don't have to weld any material onto them to make a more aggressive profile. By doing that, the "heel" of the cam lobe becomes the baseline for the closed valve. In M5X/S5X, the hydraulic lifters take up the extra slack.

Who do you use for your "cam welding and regrinding"?

Your reground specs have more lift and duration than stock S52 cams, so they have to weld them to get that. By simply grinding stock S52 cams they are making them milder, less lift, less duration

You can't reduce base on these

I just used stock S52 cams on my car they are aggressive enough.

[BenM]

Your reground specs have more lift and duration than stock S52 cams, so they have to weld them to get that. By simply grinding stock S52 cams they are making them milder, less lift, less duration

You can't reduce base on these

I just used stock S52 cams on my car they are aggressive enough.

How are you not getting this? Do you even understand how a cam works?



See the base circle? They reduce that (well the heel). When the base circle is reduced, it effectively changes the baseline of where the valve is closed (slack is taken up by the hydraulic lifter) and that allows them to create a different profile of the lobe with more lift/duration (obviously you can only gain so much).

[Deadskittles]

Holy shit... Do you still need this?

[BenM]

Holy shit... Do you still need this?

Yup, still looking. Sent you a PM too.

[DesertBMW]

(slack is taken up by the hydraulic lifter)

Not on M50/S52 variant engines, tray has a stop for a lifter