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Which engine would you choose for a swap?
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Yes, fuel efficiency for me, but this thread isn't just for myself. I know other people would prefer to have a more powerful engine. M54 is great. I have one sitting in the Landy, but that vehicle is larger/heavier and needs the extra power.
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I’d double check those weights though, the M54 is pretty light for a 6 (all aluminum) and even in my big ass X3 and my heavy right foot, I still manage a 16mpg. That swap is still on my radar for either the Touring or the racecar at some point.
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So this whole time you've been after fuel efficiency and not 200hp? M44 and done it's basically an economy engine, will yield great MPG. Handling? You may not notice a difference in handling there. AFAIK the M54 is lighter than the M20, and the M20/G260 package is 70lbs heavier than the M42/G260 package. CG would be a little further forward, probably a couple percentage points on the F/R balance if you weigh it.
Which would make you smile the most behind the wheel? All 3 produce similar peak power (200+ HP), but each has a little different characteristics and they have their own pros and cons.Last edited by varg; 07-27-2019, 10:40 AM.
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Originally posted by Motheye99 View PostIf your ok with being down on power and just want a fuel efficient car to zip around and have fun with a M44/M42 with bolt on's should do you good. Cant justify the cost building them when the M54 is a option. I've had my 318is for almost 2 years and Its perfect for around town. I'm sure a shaved 325i flywheel, exhaust, intake and tune would make it even more fun. anything past that seems financially foolish, but to each there own.
Originally posted by varg View PostWorrying about lack of fuel efficiency and dumping $10,000 on a MM engine does not compute. It's not like you're going to any better gas mileage with a high strung I4 than you will with a stock M54B30, you certainly won't be getting stock 318is gas mileage with a 205hp M42 and an M54 swap's relative cost will take a very long time to make up with a couple extra MPG.Last edited by Andrew325is; 07-29-2019, 12:50 PM.
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The point is I have sequential injection on my M20 and it made no difference in fuel efficiency that I can tell. It ended up just being a fun project - the biggest benefit is I haven't had to touch the ignition system in almost 10 years.
BTW, my E30 has run some form of Megasquirt since 2007 - I was likely the first to do MS3 on the M20. :)
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Originally posted by nando View PostA small one in efficiencyLast edited by varg; 07-27-2019, 08:57 AM. Reason: clarifying since MS could also refer to Siemens MS
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Sequential fuel injection doesn't make a big difference. A small one in efficiency, and none for power. I can switch mine on the fly between batch and sequential - you can't tell any difference in how the engine runs.
If you want fuel economy I'm not sure an E30 is the right vehicle, and the difference between the M54 and M20 is probably not as big as you'd think. But yeah, a $10k M42 build is probably not a great investment - other than doing it because you can and just enjoying the process.
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Originally posted by digger View Poston the contrary my MM stroker got way better fuel economy than what it did stock b25 (atleast while cruising), but thats because the cam was specced that way unbeknown to me at the time and the upped CR really helps. they claim their ST is repsonsible for that and being able to run high compression on pump fuel buts its just the cam(s) they use. Their engines are no where near highly strung they also dont perform anywhere near as well as youd expect for the work they do.Last edited by varg; 07-27-2019, 08:51 AM.
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Originally posted by varg View PostWorrying about lack of fuel efficiency and dumping $10,000 on a MM engine does not compute. It's not like you're going to any better gas mileage with a high strung I4 than you will with a stock M54B30, you certainly won't be getting stock 318is gas mileage with a 205hp M42 and an M54 swap's relative cost will take a very long time to make up with a couple extra MPG.
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Worrying about lack of fuel efficiency and dumping $10,000 on a MM engine does not compute. It's not like you're going to any better gas mileage with a high strung I4 than you will with a stock M54B30, you certainly won't be getting stock 318is gas mileage with a 205hp M42 and an M54 swap's relative cost will take a very long time to make up with a couple extra MPG.
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Originally posted by Andrew325is View PostThe only V8 I'd consider for an E30 would be the S65, but V8s are not fuel efficient and I don't need that much power myself so I wouldn't want it. IMO M30 belongs in a E32 or E24. Simple and reliable, but it's not fuel efficient and too big and heavy for an E30. Most people do a swap because they want more power, like I did before with S54. My E30 is a daily driver that I use for running errands around town, so if I swap an engine into it I want one that is inexpensive, fairly reliable, and provides better fuel economy. I would also want something more modern with OBD2. So an M44 fits the bill for me. I think it would be neat to have a high-spec 318is (with the 325is options).
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The only V8 I'd consider for an E30 would be the S65, but V8s are not fuel efficient and I don't need that much power myself so I wouldn't want it. IMO M30 belongs in a E32 or E24. Simple and reliable, but it's not fuel efficient and too big and heavy for an E30. Most people do a swap because they want more power, like I did before with S54. My E30 is a daily driver that I use for running errands around town, so if I swap an engine into it I want one that is inexpensive, fairly reliable, and provides better fuel economy. I would also want something more modern with OBD2. So an M44 fits the bill for me. I think it would be neat to have a high-spec 318is (with the 325is options).
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Originally posted by Caperix View PostWe had similar issues with my wife's Element. That engine started burning oil bad at highway speeds as well. The single vtec k24 in the CR-V & Element seem much more prone to these issues. As well a burned exhaust valves & transmission problems. It may be that these are more likely to be neglected, I think my wife's car was not treated well it's first 60k by a previous owner.
We sold it & got her the e30 325i. We are both much happier now.
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Originally posted by varg View PostThere's an M42 pattern G240 as well. Not sure how an M10/M30 pattern compares to an M20 pattern or M42 pattern, but I know the M20 G260 bolts to the M42 with a bit of an improper tilt.
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