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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 10-31-2011, 08:59 PM   #1
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S52 cams and lifters in M54?

The thought came to me just a few minutes ago. I mean, the vanos system between the single vanos and double vanos engines is nearly identical, the only question would be 1. Who would do this and 2. would it be worth it?
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Old 11-01-2011, 03:34 AM   #2
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I'm thinking like it would be too much work for the small gains.
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Old 11-01-2011, 06:15 AM   #3
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Cam tray fits

Lifters fit

Cams do not fit
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Old 11-01-2011, 06:18 AM   #4
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I asked about this in a M52tu and was told it would work, but that the trouble wasn't worth the minimal gain.
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Old 11-01-2011, 09:49 AM   #5
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I'm thinking like it would be too much work for the small gains.
Ehh, they would be the most 'aggressive" factory cam swap.
252 / 10.2 Intake
240 / 9.7 Exhaust


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Cam tray fits

Lifters fit

Cams do not fit
I figured the first two would, but why don't the cams? Have you personally attempted this?

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Originally Posted by snikwad View Post
I asked about this in a M52tu and was told it would work, but that the trouble wasn't worth the minimal gain.
See first response.

Honestly, I was just curious. I'm keeping my fingers crossed for a 264/256 swap eventually.
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Old 11-01-2011, 01:40 PM   #6
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With 252 duration on the intake its def. Better than the stock m54b30 cam but the exhaust at 240 seems to be a bit less duration than an m54b30 cam. Don't they have about 244 stock?

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Old 11-01-2011, 02:11 PM   #7
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The s52 cams fit, I'd get them reground, if you are going F/I. Stick with just the intake. Leave the exhaust alone. You can only get around 6% increase flow from head work. I was going to do head work but cams > head work. GL OP.

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Old 11-02-2011, 12:45 AM   #8
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The duration on the M54's exhaust cam is higher, but the overall lift is lower. The intake cam is clearly superior than stock, but Shricks 264/10.5 intake cam is hotter still. I'm not planning any headwork (though there are great gains to be had) but cams are on my list...eventually.
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Old 11-02-2011, 12:46 AM   #9
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The s52 cams fit, I'd get them reground, if you are going F/I. Stick with just the intake. Leave the exhaust alone. You can only get around 6% increase flow from head work. I was going to do head work but cams > head work. GL OP.
More information please.
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Old 11-02-2011, 01:16 AM   #10
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Ehh, they would be the most 'aggressive" factory cam swap.
252 / 10.2 Intake
240 / 9.7 Exhaust

........ I'm keeping my fingers crossed for a 264/256 swap eventually.

You remember I can get you the 264 intake cam with 10.5 lift / 252 exhaust cam with 10.00 lift........Cheap. (cheap is a relative term) These cams will make more WHP than the Schrick 264/248, and work in ALL M54 motors.
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Old 11-02-2011, 01:50 AM   #11
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You remember I can get you the 264 intake cam with 10.5 lift / 252 exhaust cam with 10.00 lift........Cheap. (cheap is a relative term) These cams will make more WHP than the Schrick 264/248, and work in ALL M54 motors.
^You're exactly who I'm referring to in these post...
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Old 11-02-2011, 01:59 AM   #12
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^You're exactly who I'm referring to in these post...

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Old 11-02-2011, 02:47 PM   #13
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More information please.
IF your going F/I get them reground. If you are staying N/A leave the cams be. They will fit.

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Old 12-07-2011, 10:20 PM   #14
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S52 Cams in M54/M52tu

I have done a lot of research on this. The exhaust cams are different, big duh. So you cant use the s52 exhaust camshaft. Now the intake camshaft you can use as best as i can tell from comparing a s52 intake cam and a m54 intake cam i have at my shop. you would want to take the helix gear off the s52 camshaft so you have a bare s52 intake camshaft as the vanos design between the s52 and m54/m52tu are different. To install you will want to take your m54/m52tu helix gear and vanos and install it on your s52 intake camshaft when reinstalling the cams. DO NOT attempt to do this job unless you have camshaft lock plate, tdc lock pin, and vanos alignment tools. If your going to do it have the tools. if you try to ball park this it will never be right and may cause engine damage. After the mod you should get about a 30 to 40 hp gain. This is also a great mod to do with headers and a m54b30 intake (if you have the m52tu engine). the headers and intake manifold made a big difference on my m52tu engine. Any questions just ask.
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Old 12-07-2011, 11:20 PM   #15
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I have a question. Where is any evidence of a 30 to 40hp gain? Schrick cams don't make those sort of gains....

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I have done a lot of research on this. The exhaust cams are different, big duh. So you cant use the s52 exhaust camshaft. Now the intake camshaft you can use as best as i can tell from comparing a s52 intake cam and a m54 intake cam i have at my shop. you would want to take the helix gear off the s52 camshaft so you have a bare s52 intake camshaft as the vanos design between the s52 and m54/m52tu are different. To install you will want to take your m54/m52tu helix gear and vanos and install it on your s52 intake camshaft when reinstalling the cams. DO NOT attempt to do this job unless you have camshaft lock plate, tdc lock pin, and vanos alignment tools. If your going to do it have the tools. if you try to ball park this it will never be right and may cause engine damage. After the mod you should get about a 30 to 40 hp gain. This is also a great mod to do with headers and a m54b30 intake (if you have the m52tu engine). the headers and intake manifold made a big difference on my m52tu engine. Any questions just ask.
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Old 12-09-2011, 03:17 AM   #16
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I have a question. Where is any evidence of a 30 to 40hp gain? Schrick cams don't make those sort of gains....
This, i wish i got those gans to justify the price i paid. Thats why i sold them.

Quick question. Will ZHP cams work in my M52tuB25? I can get them cheap and im pulling the head to fix a lifter so i figured ill try something different...but i dont want to buy them if they arent going to work.
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Old 12-12-2011, 05:24 AM   #17
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I wouldn't bother and have just gone with Shrick
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Old 12-14-2011, 06:08 PM   #18
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This, i wish i got those gans to justify the price i paid. Thats why i sold them.

Quick question. Will ZHP cams work in my M52tuB25? I can get them cheap and im pulling the head to fix a lifter so i figured ill try something different...but i dont want to buy them if they arent going to work.
Yes zhp cams do fit, my butt dyno doesnt feel the value however.
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Old 12-14-2011, 06:14 PM   #19
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Cam tray fits

Lifters fit

Cams do not fit
Not entirely true, but your still my idol.
Intake cam will fit with a minor tweak, exhaust doesnt. Most people would say who cares because the m54/m52tu has more duration anyway, however you can tell by eye the profile of the s52 exhaust is a lot more aggressive. My bet is just looking at just duration and lift doesnt tell the full story.
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Old 12-14-2011, 06:33 PM   #20
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Originally Posted by gvillelube View Post
I have done a lot of research on this. The exhaust cams are different, big duh. So you cant use the s52 exhaust camshaft. Now the intake camshaft you can use as best as i can tell from comparing a s52 intake cam and a m54 intake cam i have at my shop. you would want to take the helix gear off the s52 camshaft so you have a bare s52 intake camshaft as the vanos design between the s52 and m54/m52tu are different. To install you will want to take your m54/m52tu helix gear and vanos and install it on your s52 intake camshaft when reinstalling the cams. Any questions just ask.
Your close, however from my testing trying that will not work. All the cams I've seen the bolt diameter between s52 (or even m50/52) helix and m52tu/m54 is different. However you can take the s52 helix off and add a spacer/ washer between helix and cam and then either grind off one of the splines on the helix or remove/ drill the dowl pin on the vanos gear. And it will work. (yes I've done it before)

Several notes:
Late 98 or 99 s52 camshafts may have the same bolt diameter helix as m54 and would make the swap easier. Only camshafts I've tested are 97 and older s/m 52/50.

The helix bolts are on very very tight, impact usually does not take them off, I have to use a 2 1/2 breaker bar to break them loose most of the time and there isn't really a good spot to hold the cam down. I have broken one by holding it from the rear

M52tu vanos gears have dowls while te newer ones are one piece solid.

The helix has to be put back it the same position... I believe VAC sells a tool to do this properly
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