288/280 vs 280/272 cams.

[duracellttu]

This was my thoughts as well. 280/272 seems to have the wide usable powerband of stock cams but with more power over 6k so it's the best of all worlds. I honestly would hate it if the S54 became any weaker down low. As much as I've tried to combat that (gears, lightweight mods, lightweight tires and wheels), this engine's weakest point is the anemic low end.

What is the consensus on needing bigger fuel injectors for 280/272? I still have my 550cc injectors installed and planned to keep them.

[EthanolTurbo]

During my original build I want to make big numbers on the dyno and squeeze all the power I could out of the engine. Since this is a street car and not a track car I'm not going to driving at red line very often. I've decided to change cam sizes to shift the power lower in the rpm band, which is more suitable for street driving.

Honestly from all the dyno chart I've seen, the peak power at redline different between the two cam sizes isn't drastically different.

Interested to hear others opinions.

This was my thoughts as well. 280/272 seems to have the wide usable powerband of stock cams but with more power over 6k so it's the best of all worlds. I honestly would hate it if the S54 became any weaker down low. As much as I've tried to combat that (gears, lightweight mods, lightweight tires and wheels), this engine's weakest point is the anemic low end.

[duracellttu]

Reason / thoughts re: switch from 288/280 to 280/272? Thx


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During my original build I want to make big numbers on the dyno and squeeze all the power I could out of the engine. Since this is a street car and not a track car I'm not going to driving at red line very often. I've decided to change cam sizes to shift the power lower in the rpm band, which is more suitable for street driving.

Honestly from all the dyno chart I've seen, the peak power at redline different between the two cam sizes isn't drastically different.

Interested to hear others opinions.

[empty]

Just wanted to follow up with these comments from a few years ago. Are these BMW DLC coated rockers still recommended with new Schrick cams? Looks like I'm going to need a full head rebuild and will likely replace the 288/280 with 280/272.

Reason / thoughts re: switch from 288/280 to 280/272? Thx


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[duracellttu]

This should be big news...

Can anyone confirm the part number in question?

I've looked up the part numbers using RealOEM and then priced them. The E90 320is looks to be 11337549034 and is 48 Euros on the Leebmann site (@ $57 USD). The S54 rockers are part number 11337833259 and are around $55 USD in the US. Would hate to order them from Leebmann in Germany and find that they aren't the correct part...

Yeah they are known. Also used on the P54 engine. Basically identical to the stock S54 fingers, except have a DLC coating. No reason to spend big money on the Schricks while those are available.

Just wanted to follow up with these comments from a few years ago. Are these BMW DLC coated rockers still recommended with new Schrick cams? Looks like I'm going to need a full head rebuild and will likely replace the 288/280 with 280/272.

[maupineda]

I would assume the same tolerance, +/- 0.025mm or +/- 0.001in

[duracellttu]

I did look before posting and it says 0.25mm or 0.0098''.

I stand corrected. I remember the numbers were different but didn't recall the units. Apologies for the confusion!

[Gt4]

If you go to the Schrick website and download the data sheet for the cams it will be listed there. The lash spec is different than stock cams.

I did look before posting and it says 0.25mm or 0.0098’’.

[terra]

What’s the intake & exhaust valve clearence with Schricks 280/272 camshafts? I read 0.0098’’ but is there a +- tolerance??

Stock it’s between 0.007-0.009’’ for intake and 0.011-0.013’’ for exhaust side? So I was wondering what is the tolerance with Schricks cause no way it will be bang on!!

I just assumed same tolerances as stock. So 0.009 - 0.011

[duracellttu]

What's the intake & exhaust valve clearence with Schricks 280/272 camshafts? I read 0.0098'' but is there a +- tolerance??

Stock it's between 0.007-0.009'' for intake and 0.011-0.013'' for exhaust side? So I was wondering what is the tolerance with Schricks cause no way it will be bang on!!

If you go to the Schrick website and download the data sheet for the cams it will be listed there. The lash spec is different than stock cams.

[Gt4]

What’s the intake & exhaust valve clearence with Schricks 280/272 camshafts? I read 0.0098’’ but is there a +- tolerance??

Stock it’s between 0.007-0.009’’ for intake and 0.011-0.013’’ for exhaust side? So I was wondering what is the tolerance with Schricks cause no way it will be bang on!!

[bmw m3 s50]

Only rockers are necessary with cams. The intake cam sensor is a pain to change so you can do that.

I did a full head refresh, all new valve parts along with a machining to clean it all up. I did all knock sensors, cam sensors, crank sensor, oil drain back to the pan with the check valve, ICV hoses, new injectors, new fuel regulator with a new vacuum line, new fuel filter, just did a waer pump and thermostat, the heater hose to the head(whoch was actually starting to leak), new chain tensioner, new tensioner guide with the reinforced one, and new spark plugs.

Check your metal coolant pipe for pitting. Coolant rarely gets replaced every 4 years and electrolysis eats at it. It's like a $200 pipe. I'm going to be ordering that as well one of these days. I haven't driven the car in 6 months sadly from just not having time to assemble it.

Did you by any chance post a thread on your install? I am probably going to replace as much as I can while in there so I am worry free. Grant it, the car has low mileage but the car is going thru a restoration and I am in the planning stage at this point with sourcing parts. I do plan on doing the VANOS lockout while I am doing cams so I would address the timing chain issues while doing the VANOS Lockdown.

[Arith2]

What is recommended to be changed when swapping cams?

I plan on doing Beisan Vanos Lockdown while I am in there, but would love to get as much as possible while I am in there to cut down on labor costs in the future.

Only rockers are necessary with cams. The intake cam sensor is a pain to change so you can do that.

I did a full head refresh, all new valve parts along with a machining to clean it all up. I did all knock sensors, cam sensors, crank sensor, oil drain back to the pan with the check valve, ICV hoses, new injectors, new fuel regulator with a new vacuum line, new fuel filter, just did a waer pump and thermostat, the heater hose to the head(whoch was actually starting to leak), new chain tensioner, new tensioner guide with the reinforced one, and new spark plugs.

Check your metal coolant pipe for pitting. Coolant rarely gets replaced every 4 years and electrolysis eats at it. It's like a $200 pipe. I'm going to be ordering that as well one of these days. I haven't driven the car in 6 months sadly from just not having time to assemble it.

[Epoustouflant]

What is recommended to be changed when swapping cams?

I plan on doing Beisan Vanos Lockdown while I am in there, but would love to get as much as possible while I am in there to cut down on labor costs in the future.

Well, what's recommended will vary on your current engine's condition, and planned use.

On the S54, I did full VANOS rebuild, a few tough to reach sensors while the engine was out, along with new cams, rockers and valve adjustments, along with every mandatory replacement bolts, gaskets and o-rings.

On the S85, going a bit further on the 296/284 cams install and doing new valve seats, stems, uprated springs, titanium retainers and collets as there's no VANOS to overhaul, along with every mandatory replacement bolts, gaskets and o-rings.

Rod bearings were serviced on both engines as well.

When it comes to this engine work, it's always best to discuss face to face with whoever will work on your engine to get a feel for their experience, and distinguishing from what you'll read on the Internet, and what happens in real life.

[bmw m3 s50]

Not every single product will be perfect every time. It's just how it is. Follow torque sequences and replace the bolts that need to be replaced. There is so much you can replace while doing cams. I opted to doing literally every sensor, hose, and refresh my SMG fluid which has a 5 year service life. Have you removed a head before?

What is recommended to be changed when swapping cams?

I plan on doing Beisan Vanos Lockdown while I am in there, but would love to get as much as possible while I am in there to cut down on labor costs in the future.