Hey all, I know I'm more than likely asking a question that's been answered before, but I'm swapping a 2.5 into my 325e and I now have the old 2.7 sitting in my back yard. My question is the following: is it worth the time to use the parts from an eta motor to stroke my 2.5 or would I be better off hunting down all the parts necessary from a seta, or is that even worth it? I'm happy with the power output of the M20 but if I can do something low cost to enhance the overall performance of the car I figure it's worth looking into. Thanks!
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M20b25 stroker using eta parts
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There is a lot of info on this topic:
https://www.r3vlimited.com/board/for...ker-build-info
https://www.r3vlimited.com/board/for...-wall-help-pls
https://www.r3vlimited.com/board/for...-should-i-swap
If you're happy with the power of the m20, just put it in there and be happy. Unless you plan on rebuilding the m20b25 anyway, opening the engine is opening a whole can of worms.sigpic
1987 - 325i Convertible Delphin Auto [SOLD], 325i Convertible Delphin Manual [SOLD]
1989 - 325i Convertible Bronzit m30b35 swapped [SCRAPPED], 325i Sedan Alpine Auto[DD]
1991 - 325i Coupe Laguna Manual [Project], 535i Sedan Alpine [SCRAPPED]
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Originally posted by McGyver View PostThere is a lot of info on this topic:
https://www.r3vlimited.com/board/for...ker-build-info
https://www.r3vlimited.com/board/for...-wall-help-pls
https://www.r3vlimited.com/board/for...-should-i-swap
If you're happy with the power of the m20, just put it in there and be happy. Unless you plan on rebuilding the m20b25 anyway, opening the engine is opening a whole can of worms.
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To add onto all of that. I’m a very broke college student with intentions to play baseball until I can’t anymore (which means I will likely be very broke for quite a while longer) so I don’t really have the means to ball out on a crazy stroker build or any sort of time-intensive swap. This car will also be my daily when I head back to school this fall so the 2.7i will be built outside of the car in my spare time (or crammed into one or two weekends). The end goal is to have a super fun canyon carver under $10k. I’m already a little under $4k into this project and I plan to spend around $2k on suspension, $1k on interior, and another $2k on paint (unless I decide to paint it myself). Hopefully that’s an overestimate on all fronts but those figures would leave $1k of wiggle room plus some parts that I have that I’m trying to sell off. From what I see that is about what it would cost to build a 2.7i if I bought a seta and used the innards of my i motor. Hopefully that helps add a little perspective.
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a 2.7 based engine using 885 head, b25 piston, eta pistons and rods is worth doing over b25. There isnt much expense if you have a good set of pistons and block in good condition provided you do assembling yourself.89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
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The hang up you will encounter is that you’re starting with an eta car. You will need a tach and a DME/wire harness. My son has an eta car and he has built a 2.7i, the hang up for us is getting the harness and DME. He has a tach thoughMy son has the 1987 325e, 2 door, 5speed
I daily the 1989 325i, 4 door, 5speed
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Originally posted by 325e '87 View PostThe hang up you will encounter is that you’re starting with an eta car. You will need a tach and a DME/wire harness. My son has an eta car and he has built a 2.7i, the hang up for us is getting the harness and DME. He has a tach though
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