Why the m50 manifold? The DISA valve and variable volume are what help give that motor such wide torque cruve, right?
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M54 Madness, the remix
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Originally posted by CorvallisBMW View PostWhy the m50 manifold? The DISA valve and variable volume are what help give that motor such wide torque cruve, right?
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Current status is that the IAC bracket is fabricated.
I'll be pulling the cams and then head in the next several weeks, need to figure-out what I'm doing as far as valve grind, guides and so on. It's a low-mile motor, so nothing probably needs to be done, but a good valve grind can make a big difference.
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Head is removed. Everything looks good except for some scoring on one of the exhaust cam journals. There was also enough loose carbon in each bore that I could vacuum it out; like a teaspoon of carbon was sprinkled on each piston.
Valves will be removed. Port will be matched to the new M50 intake manifold, the ports will be cleaned up a little bit (mostly exhaust!) and then the head will go to machinist for good valve cut and assembly.
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I borrowed the appropriate templates and cut the intakes to match the M50 manifold. With the right burr it took about 2 hours. Still need to plug the idle passages and do some minor work on the exhaust ports and then the head goes to the machinist.
The one on the left is done and the one on the right shows about how much material is removed. The blend goes about 1" into the port.
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Originally posted by E30 Wagen View PostUpdates?
Can you comment on if it's easier to swap in one from a e39 vs e46?
The e39 and e46 motors are the same as far as the swap. There are a few differences between early and late M54s. Some have 4 studs per exhaust port and some don't. That's an issue for me, because my euro s50b32 headers don't have the larger flanges that tie 3 runners together; they have an individual flange per port and my new motor doesn't have 4 studs per port, so I'll be getting new headers.
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Steve
Are you still developing this engine for your DD?
Having followed your original blog all the way, I'm struggling to understand why you are now giving up on DISA? Once you got it set up, you repeatedly showed how it helps with bottom end torque, and how that helps make your E30 a better performing DD with a very wide flat torque curve.
The dyno graph you have posted reveals more by what you have not shown - the loss of torque below 3750rpm. This appears to fly in the face of everything you have endorsed in your current swap?
What has convinced you to go with the M50 manifold?
Please don't tell us you have finally been seduced by headline power figures, and higher revving engines??!!
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Originally posted by mike25 View PostSteve
Are you still developing this engine for your DD?
Having followed your original blog all the way, I'm struggling to understand why you are now giving up on DISA? Once you got it set up, you repeatedly showed how it helps with bottom end torque, and how that helps make your E30 a better performing DD with a very wide flat torque curve.
The dyno graph you have posted reveals more by what you have not shown - the loss of torque below 3750rpm. This appears to fly in the face of everything you have endorsed in your current swap?
What has convinced you to go with the M50 manifold?
Please don't tell us you have finally been seduced by headline power figures, and higher revving engines??!!
I'm not completely lost to the dark side; I'm convinced I get achieve 250whp on this setup and the increase in power across a wide chunk of the powerband is irrefutable. It's the same effect as headers which may cause a small drop in low-rpm torque but more than make up for it with a broad power increase.
Add the fact that the m50 manifold weighs significantly less and looks cleaner; I'm willing to be a guinnea pig.
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