2.2 Stroker

[JungleGus]

talking with some car club guys today, apparently ACS made a 2.2 M42? what sort of power would a stroker like this put out?

and how, M44 crank and custom pistons i imagine?

[StreetSpec_iS]

custom crank im guessing.

Guys have started doing this with the m47 diesel crank, and an overbore. getting just over 2.1l.

check out the thread on Febi's engine build.

[asubimmer]

2.2 seems a little much, but maybe a skilled machinist could pull it off. I wouldn't want to go much over 2.0 though b/c boost + really thin walls = bad ;)

[tim_s]

ACS made a 2.1, hartge a 2.1 and a 2.3. they all used really long throw stroker cranks - they were bored too though

[Febi Guibo]

For N/A motors, 2.1 is about ideal (my opinion)... you can take it out to a perfectly square bore/stroke, and with custom pistons you can have a non interference setup.

The M44 crank provides a marginally longer stroke, and to my knowledge, it's cast, rather than forged...

My target was around 100hp per liter, without being too fussy and reasonable for normal, high-traffic NYC driving... hopefully I can get the car on a dyno in october and we'll know how close I got.

[wadhip]

can i use M44 piston (85mm) combine with crank from M47 (88mm, forged, no balancer) because this crank same construction with crank M42 .. and it's produce 1997cc -->> bore x stroke = 85 x 88
wow, that's must be incredible i guest.. :)
what do you think guys ??

[Febi Guibo]

I'm bored and stroked to (about) 2130cc... it's nice!

If yer going to go through all that trouble, consider S50 or custom pistons.

[JetBlack95]

Gizmo on BFC is at 2.19XXX L, M47 Crank, and i believe M44 rods?

[Gizmo318i]

Wow, Im really impressed! Since I built my 2044cc M42 last year, alot of people have been following suite. Nice! Viva La M42!

[ptowntsi]

while searching for strokers i found this page.

do you guys know if they are offset grinding the M47 cranks to get to 2.2 or using 87mm pistons? what is the largest piston guys have gone to with the M42 blocks?

[nuvolarossa]

while searching for strokers i found this page.

do you guys know if they are offset grinding the M47 cranks to get to 2.2 or using 87mm pistons? what is the largest piston guys have gone to with the M42 blocks?

do not go over 87mm in every case (na or turbo), if you want that thing last...

this is what hartge do for M44s(99,8 mm stroke :) ):

http://i3.photobucket.com/albums/y75/nuvolarossa/host/hartge.jpg

[christophbmw]

I know metric mechanic goes to a 87mm bore on their rally engine and an 88mm stroke. they put out about 205hp (with some different camming, and other various things). their motor the build is actually more reliable than w/ factory components because they lighten everything up (and its got a 8K redline!). the M44 only has a 2mm longer stroke, if you go throught the hassle why not go all out and get the M47 crank?

Wow, Im really impressed! Since I built my 2044cc M42 last year, alot of people have been following suite. Nice! Viva La M42!
which tranny are you using and how did you do the conversion?

[jpod999]

I know metric mechanic goes to a 87mm bore on their rally engine and an 88mm stroke. they put out about 205hp (with some different camming, and other various things). their motor the build is actually more reliable than w/ factory components because they lighten everything up (and its got a 8K redline!). the M44 only has a 2mm longer stroke, if you go throught the hassle why not go all out and get the M47 crank?


which tranny are you using and how did you do the conversion?

Christoph, look at the date of his post. Over a year ago, I have never seen him post here before that one. That car is sick though, you see the unilug suspension?

[AL GReeNeRy]

read up

http://forums.bimmerforums.com/forum/showthread.php?t=433471

[ptowntsi]

wow after looking at specs on the motors even a 2mm bore to 86mm is a .080" on a domestic v8 ! a lot of the new blocks don't recommend going any more than .030 or .040 more than factory, and this is on a stock 4"/101.6mm bore.

[gearheadE30]

Well, if you want to go with a stroker, I think MM is your est bet because that engine is so reliable. I personally don't trust my skills (or lack thereof) to build an engine that it reliable, let alone safe...

[2002maniac]

Christoph, look at the date of his post. Over a year ago, I have never seen him post here before that one. That car is sick though, you see the unilug suspension?

I bet those are centercaps.