the 731 head is the euro b20 head. so you get higher compression. but the ports need to be opened up to the 885 size to get power out of it. the 885 will lower your compression to 8.5:1(using eta lowers)
What does it take to wake up the m20b27 "e" motor?
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I had a bavauto chip in my 87 eta, made a night and day difference.Comment
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So with just an 885 head and normal eta bottom end does the lower compression affect power at all?Last edited by shaferbm; 03-12-2012, 07:17 PM.
-'87 325 - ratbox swap http://www.r3vlimited.com/board/show...77#post3250277 << Check out my Wanted threadComment
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I guess it looks like a 731 head would be the way to go. Is the 7k redline possible with the 731 head and i components?
-'87 325 - ratbox swap http://www.r3vlimited.com/board/show...77#post3250277 << Check out my Wanted threadComment
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I cannot comment directly to the performance of the 885 as I have not driven a car with this set up. I can tell you that had I not found the 731 head I would have went that direction, shaved the head and block and ran a thinner gasket. A CR of 8.5:1 is not bad at all. I do think that is very optimistic without doing the above. With the 731 head, I should retain my 9:1 CR. One of the advantages to running the higher CR is the ability to get more out of a more aggressive cam profile. Also, to your 173 dme question, you will absolutely need to upgrade to motronic 1.3 to realize the benefits of this setup. However, you can also purchase a chip from Mark D for around 300 that will work with your 027 dme with these modifications, thus not having to swap out the wiring harness and ascociated sensors. That is the route I am going for now.Comment
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-'87 325 - ratbox swap http://www.r3vlimited.com/board/show...77#post3250277 << Check out my Wanted threadComment
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I do however want to make it clear that I am not saying this is the best/only way of doing it, all things aside, I would have done the motronic swap had I the resources and time. But this is my DD and I cant risk running into a wiring hiccup.Comment
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Why not? people r3v the m20b25 "i" engines until rocker explosion. a properly built and balanced 2,700-3,100cc bottom end m20 should have no issues with 7,000 rpm.OBD1 M54/M52TU swap as a M50b25
Z4 non powered steering rack fits e30
Euro e46 2005/6 320d 6mt gearbox into E30 with M20 hardy and beck 1985 327s engine
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I don't think I'll be rebuilding my bottom end if I don't need to (at least while this car is still in dd land). I'll assume the stock internals are properly built. Cheapshot, I have been reading your 731 head build thread and am appreciating it's wealth of info.
I'll be sure to call him later, but does markD have aseparate eta chip and 2.7i chip or are they the same thing? Because I don't want to put a chip in there that will let it rev to 7k with the factory eta head that can't handle it.
-'87 325 - ratbox swap http://www.r3vlimited.com/board/show...77#post3250277 << Check out my Wanted threadComment
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Chip and I cam are two major mods. Then I head, intake, etc."I'd probably take the E30 M3 in this case just because I love that little car, and how tanky that inline 6 is." - thecj
85 323i M TECH 1 S52 - ALPINEWEISS/SCHWARZE
88 M3 - LACHSSILBER/SCHWARZE
89 M3 - ALPINEWEISS II/M TECH CLOTH-ALCANTARA
91 M TECHNIC CABRIO TURBO - MACAOBLAU/M TECH CLOTH-LEATHER
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Yes, they are two different chips. If you are planning on going with the head swap, I would suggest picking up an eta chip in the interim for the stock motor. The 2.7i chip was dyno tuned specifically for the 731 head swap. I think the redline on the eta chip is around 5400 and on the 2.7i chip around 6200 but don't hold me to this. Mark is digging up his old dyno sheets and specs on the chip and sending them to me. PM me your email address and I will forward the information to you once I receive it.Last edited by cheapshot; 03-15-2012, 06:03 AM.Comment
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I've sold a few in the last few years and people love them.
I'll post again here with more details in a few days.
MarkDURL: www.dsylva-tech.caComment
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