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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 06-03-2010, 10:44 AM   #1
zorin
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m54b30 head on m54b25

I got a free complete b30 head and I was wondering what else do I need to make it work. I will keep my stock intake manifold and maf. I will be doing it together with my headers.
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Old 06-03-2010, 11:30 AM   #2
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The B30 and B25 heads are the same save for cams (intake side) The manifold is different, and the B30's flows "better"
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Old 06-03-2010, 11:37 AM   #3
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The B30 and B25 heads are the same save for cams (intake side) The manifold is different, and the B30's flows "better"
I guess I will look for the intake manifold as well.
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Old 06-03-2010, 11:47 AM   #4
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I have stock b30 cams for sale if you need them. I'm also local.
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Old 06-03-2010, 03:41 PM   #5
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Only the intake camshaft is different, as it's 240 degrees of duration and 9.7mm of lift vs 224 degrees and 9mm of lift for M52tu and M54B2X motors. My advice is to grab ZHP cams, Shrick, or have a stock set reground to more aggressive specs. (have to find someone who would do that)
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Old 06-03-2010, 05:48 PM   #6
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Only the intake camshaft is different, as it's 240 degrees of duration and 9.7mm of lift vs 224 degrees and 9mm of lift for M52tu and M54B2X motors. My advice is to grab ZHP cams, Shrick, or have a stock set reground to more aggressive specs. (have to find someone who would do that)
so stock 330i head is not worth the hassle then
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Old 06-03-2010, 05:51 PM   #7
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Unless you have the timing tools to do the head swap, it's not worth what you'll get charged for labor unless you're going with aggressive schrick cams, as Iceman said. If you were to do the entire head swap with schricks, along with the b30 mani and your headers, your car would be quite quick for a b25 though.
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Old 06-03-2010, 07:35 PM   #8
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IMHO you'd be better off selling the head to someone with a blown up B30, and use the cash for a more direct swap. A complete M54B30 would be better.

This is a common mistake on e30s, people put an M20B25 head onto M20B27 block and get it up and running, only to realize that an M50 swap would bring more power and a chain driven engine instead of dealing with timing belts. The cost/benefit of your proposal is pretty weak as far as I can tell
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Old 06-03-2010, 08:45 PM   #9
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Tools and labour are not a problem.
What would be my gain by doing the head swap and keeping the b25 intake manifold ?
I got the head for $50 so it was not a huge investment.
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Old 06-03-2010, 08:50 PM   #10
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Tools and labour are not a problem.
What would be my gain by doing the head swap and keeping the b25 intake manifold ?
I got the head for $50 so it was not a huge investment.
Nothing, the head is the exact same unless you are swapping cams, sorry.
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Old 06-03-2010, 08:50 PM   #11
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Again, the head is the same, the ONLY difference that I know of is the intake camshaft (as well as the valve timing, controlled by the ecu) and the intake manifold, both of which are better than 325 gear, but I'm not sure it's worth the upgrade. If you do decide to go through with this, please do a before and after dyno. I'm willing to bet (with a tune) that those mods alone would close the gap on a 3.0liter, but I'm not sure it would be worth the hassle, compared to say...installing aftermarket cams which would yield more power.
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Old 06-03-2010, 09:03 PM   #12
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Thanks guys. I guess the head will be cleaned and used as a garage decoration.
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Old 06-04-2010, 02:23 AM   #13
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Only the intake camshaft is different, as it's 240 degrees of duration and 9.7mm of lift vs 224 degrees and 9mm of lift for M52tu and M54B2X motors. My advice is to grab ZHP cams, Shrick, or have a stock set reground to more aggressive specs. (have to find someone who would do that)
Out of curiosity, do the ZHP cams only differ in the intake cam as well? I have access to some parts and damn near free labor and this sounds like it could be well worth it if I could source a cheap B30 head and a set of ZHP cams. Also, how does regrinding cams work? I know the very basics on what a more aggressive cam does for a car but I thought the lobes had to be bigger to be more aggressive.
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Old 06-04-2010, 02:53 AM   #14
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for cams and the $$$$ involved I wouldnt beleive its worth the gains.

engine swaps anyone?
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Old 06-04-2010, 02:54 AM   #15
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Old 06-04-2010, 01:36 PM   #16
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If you're going to go to all that trouble, why not slap in the rotating assembly from a 3.0 and have your DME flashed?
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