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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 05-10-2012, 11:36 PM   #41
PEI330Ci
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What's the current plan and how far along are you? I've been dieing to get back working on mine but I don't see that happening for a while.
I stopped working on the 330Ci in 2010, and started working on a 330i turbo street car.
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Old 11-04-2012, 03:20 PM   #42
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how's the tranny holding?
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Old 11-05-2012, 10:14 PM   #43
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how's the tranny holding?
Doesn't even run yet...hehe
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Old 11-05-2012, 10:30 PM   #44
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I agree, it's always good to have someone to bounce numbers off of.

I've got my own spreadsheets, but I also use Larry Meaux's software.

Here's the finished piston design, which is even more extreme than you thought:







Valve relief was for really big cams....300/296 custom design from Schrick:



You don't want to oversize the exhaust valve....unless you've got a heat issue and need the extra surface area to dissipate heat back into the head. I had a head ported for 30.5mm and another head ported with 31.5mm valves, and the smaller valve flowed a little bit more up top.
Those are some serious pistons.
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Old 05-03-2013, 11:05 AM   #45
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What am I doing wrong?

Trying to calculate the compression ratio of my M54...Well what I mean to say is...I'm trying to figure out how different thickness headgaskets will affect my comp ratio, and then work out (if running 1.5bar of boost on a TD06-25G turbo) will equate to what boost compression ratio.

Basically trying to figure out what gasket to order to make my life as easy as possible. Don't want to over/under compress my engine. Hoping to find a gasket size with a sweet spot ready for my turbo setup.

Here's a screenshot of the comp ratio calculator i'm using. I just cant seem to get it right. It either displays the 100% stock engine as 7:1 or 13:1 I can't seem to enter the correct settings to get it to the 10.2:1 or whatever stock is...

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Old 05-03-2013, 09:28 PM   #46
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A couple of quick questions:
  • Since you said you are trying to make your calculations match the stock engine, can I assume that you are basing your numbers off of stock pistons?
  • If you are basing your numbers off of stock pistons, I don't think you have the right numbers. My data shows the piston at .118" below deck and the valve reliefs are so small that you can pretty much ignore them.
  • You show a dome volume of 17.4cc's. The stock piston is a flat top, which would mean 0.0cc's in that cell, or a slightly positive number if you include the tiny valve reliefs.

I get a stocked "measured" CR for the 3.0L M54 of 10.0/1, which seems to be consistent with other peoples measurements.

Gary
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Old 05-03-2013, 09:32 PM   #47
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Hi Gary,

Thanks for that. I guess what I read on the internet about the cc's wasn't correct. My engine is 100% stock. Actually, I'm not building it myself. I am driving for a team here in Japan, but due to BMW's not being popular in Japan I am trying to do the research and source the parts from the US for the guys here.

At the moment, we are only planning on ARP rod bolts, head studs, and a thicker head gasket. We're not going crazy on power, so hoping that it will be good enough for now. In the future, obviously we will be going for proper pistons, rods, crank, headwork etc. but for now we just need to get the engine running properly at around 400 crank hp.

I'm currently trying to figure out what size headgasket is the best to order. VAC (I think) has a lot of different options, so I want to work out which will be best for us. The mechanic here just said get a 2mm gasket, which is about 0.080", but I want to keep the engine response good, and off-boost characteristics nice.

Thanks for your help.
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Old 05-05-2013, 12:03 AM   #48
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If the stock CR is roughly 10:1, what thickness head gasket would be best for lowering the CR to around 9:1 ? I guess a 0.080" / 2mm would be best suited.
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Old 05-05-2013, 12:09 AM   #49
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Yes, a 2mm gasket would yield 9.0/1 on a stock m54.

Gary
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Old 05-05-2013, 12:36 AM   #50
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Thanks Gary...time to grab the boss' credit card then
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Old 06-06-2013, 09:17 AM   #51
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M54B30 Specs and Measurments

Firstly HI.
I have 330ci smg gearbox 200.000k
My engine wear is too bad l must replacing and l want incresing engine compression ratio but modded engine parts very expensive for me. please help me. Anybody dont know M54B30 spec. Anybody cant help me.
l want incresing 11.1:1 my engine ..
My guess l skim block surface gor this comp ratio
But l dont know which size skim..??
and l afraid pistons hit the cylinder head or valves hit the piston.
Can l increasing comp ratio this method..??
if this method is true , what should l do..??
Please give me your experience and knowledge please help me..


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Old 06-06-2013, 02:25 PM   #52
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I can't see the CR causing any notable increase in power.
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Old 06-06-2013, 02:46 PM   #53
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I can't see the CR causing any notable increase in power.

I hear what you're saying,......but.

It's like any of the N/A mods that we do: CAI, Catback, Power Pulleys, and Tune. It's worth the 3whp to 6whp that any of those will give you, as long as he can justify the price.

If he can pull off "decking the block" to get 11:1 compression, it will make a little more whp. But I'd go a different route.
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Old 06-13-2013, 05:32 PM   #54
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Quote:
Originally Posted by numnkaznc View Post
Firstly HI.
I have 330ci smg gearbox 200.000k
My engine wear is too bad l must replacing and l want incresing engine compression ratio but modded engine parts very expensive for me. please help me. Anybody dont know M54B30 spec. Anybody cant help me.
l want incresing 11.1:1 my engine ..
My guess l skim block surface gor this comp ratio
But l dont know which size skim..??
and l afraid pistons hit the cylinder head or valves hit the piston.
Can l increasing comp ratio this method..??
if this method is true , what should l do..??
Please give me your experience and knowledge please help me..


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With an 84mm bore, you have 55.38 cm2 area.

I found 17.4cc area inside the bore @ TDC, which works out to an "average" of 3.1mm depth.

To get 11:1 compression, you'd need to create 11.3cc area inside the bore, or reduce the deck height by approximately 1.1mm.

I have no measurement for valve clearance with this....but I've heard that it can be done.
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Old 06-14-2013, 11:08 AM   #55
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I hear what you're saying,......but.

It's like any of the N/A mods that we do: CAI, Catback, Power Pulleys, and Tune. It's worth the 3whp to 6whp that any of those will give you, as long as he can justify the price.

If he can pull off "decking the block" to get 11:1 compression, it will make a little more whp. But I'd go a different route.
From what I've seen, higher compression doesn't add any power at all, I could be wrong, but it's what I've seen so far. I would spend money on the head and crank personally.
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Old 06-15-2013, 02:23 PM   #56
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From what I've seen, higher compression doesn't add any power at all, I could be wrong, but it's what I've seen so far. I would spend money on the head and crank personally.
It works, you just need a fuel that can take advantage of it.

There are diminishing returns though; going from 9:1 to 10:1 will give you greater gains than say 10:1 to 11:1.
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Old 08-28-2013, 09:36 AM   #57
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Bringing this back to life:

Does one know how thick the liners are? is it possible to bore the block to 86.5mm? whithout using new liners?
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Old 08-28-2013, 02:27 PM   #58
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Bringing this back to life:

Does one know how thick the liners are? is it possible to bore the block to 86.5mm? whithout using new liners?
84mm bore, with 1.5mm think liners IIRC stock...so there would be nothing left of the liners if you did it.

In the racing environment, 84.5mm is as far as I've seen M54 blocks go...and engine builders didn't advise going past that.

In contrast, most sleeve vendors like to start @ 3mm thick.

I would stick with OEM liners unless you are planning to run a TON of boost.
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Old 08-28-2013, 03:02 PM   #59
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Well, my intention was to build a 3,3L M54 which should have been build by several companies here in germany, but sadly no one gives specs.

i wanted to use 86,5mm pistons and 93,8mm stroke. but if there isnīt enough material left, i will charge the engine
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Old 08-29-2013, 05:18 PM   #60
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M54B30 Specs and Measurments

Daniel

Would be a real treat to have an Alpina E46 3.3liter powerplant under the hood!!!

Regards
Nark


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