Author Topic: 2.0l M42 (Read 59509 times)

KidneyBoy · « **on:** October 20, 2008, 09:11:17 AM »

Looking to build up a spare motor for next seasons autocross into a 2.0L motor.

If i recall correctly, you can use the 1.9L crank from an M44, and euro s50 pistons. What i dont know is what headgasket to use, and if there is any other modifications nessisary to make it all work [i.e. shave the s50 pistons?]

Once i get this thing rolling, ill be sure to post up the build on here to keep a record of it.

Thanks
Joe

And for helping me, heres the M42 hard at work:

hesgone2fast · « **Reply #1 on:** October 20, 2008, 05:25:30 PM »

Hi there, well, first of all, let me ask you wt is your budget, because starting with that, we can consider what changes to do.
If you drop in the M44 crank (83,5mm) and S50 pistons (86mm), you would end up with "only" 1929cc, that�s far from your limit...
Using S52 pistons (86,4mm) would push you up to 1947cc, still not there...
But using the allmighty M47 crankshaft (pricey, but worth it) along with stock M44 (85mm) pistons, would put you on 1997cc, that looks much better, you would only need to shave the pistons 2,5mm, and your deck height would be set at "0" and CR would be 10,8:1.
Much more torque from the bottom, and nice and good compression ratio.
Cost? Well, If I were you, I would look for a full M44 spare engine, so you don�t have to look out for M44 pistons, and you wouldn�t have to bore out the block to fit the M44 pistons.
So a nice and clean M44 engine should cost no more than $400-$500.
I bought my used M47 crank off ebay for $500, shaving pistons should cost no more than $80. balance all together about $80, and rebuild gaskets, bearings etc... $300.
All adds up to $1500, decent price for a nice 2.0L motor with huge potential.
If you have some extra cash after this, drop in a set of S50 inline throttle bodies (only 4 of course...) I bought my set for $300 on ebay, and is a pretty much straight fit (minor work involved...) on our cylinder head.

This is just my thinking, someone else is very welcome to bring in more ideas or discuss my opinion.
I hope to have helped you kidneyboy.

KidneyBoy · « **Reply #2 on:** October 20, 2008, 07:59:49 PM »

Helps very much!

Option 1: 1929cc
M44 Crank
S50 Pistons

Option 2: 1947cc
M44 Crank
S52 Pistons

Option 3: 1997cc
M47 crank
M44 Pistons shaved 2.5mm

Ive looked for an M47 crank for a long time. They are hard to find in the states, looks like you have had better luck overseas. If you know of another one, please let me know. The reason i was looking for the M44 crank was simply for ease of finding the damn parts!

Anyway to run M47 crank, with shaved S52 pistons? Assuming the M47 crank is 87.9mm stroke, with S52 pistons of 86.4mm then the displacement would be roughly 2061cc?

Still, what headgasket is used?

Good & Tight · « **Reply #3 on:** October 20, 2008, 09:04:19 PM »

Quote from: KidneyBoy;58987

Helps very much!

Option 1: 1929cc
M44 Crank
S50 Pistons

Option 2: 1947cc
M44 Crank
S52 Pistons

Option 3: 1997cc
M47 crank
M44 Pistons shaved 2.5mm

Ive looked for an M47 crank for a long time. They are hard to find in the states, looks like you have had better luck overseas. If you know of another one, please let me know. The reason i was looking for the M44 crank was simply for ease of finding the damn parts!

Anyway to run M47 crank, with shaved S52 pistons? Assuming the M47 crank is 87.9mm stroke, with S52 pistons of 86.4mm then the displacement would be roughly 2061cc?

Still, what headgasket is used?

Just turbo the damn thing already, you know you want it.

Schwarz_Bomber · « **Reply #4 on:** October 20, 2008, 09:05:25 PM »

Quote from: KidneyBoy;58987

Still, what headgasket is used?

im new to this, but i am assuming if your stroke is designed not to slap the valves, you would go with a MLS and a 86.4mm gasket if your going with the s52, correct?

crazzy_hippo · « **Reply #5 on:** October 20, 2008, 09:31:56 PM »

I am also in the process of building up a 2.0L M42 motor. I am now sourcing for parts. 1st on the list is the M47 crankshaft.

Intention is to bore it up to 86mm and using metric mechanic pistons and rods and then supercharge it.

kenika65 · « **Reply #6 on:** October 20, 2008, 11:02:31 PM »

If your going to supercharge then just supercharge it geeze

hesgone2fast · « **Reply #7 on:** October 21, 2008, 03:38:14 AM »

Quote from: KidneyBoy;58987

Helps very much!

Option 1: 1929cc
M44 Crank
S50 Pistons

Option 2: 1947cc
M44 Crank
S52 Pistons

Option 3: 1997cc
M47 crank
M44 Pistons shaved 2.5mm

Ive looked for an M47 crank for a long time. They are hard to find in the states, looks like you have had better luck overseas. If you know of another one, please let me know. The reason i was looking for the M44 crank was simply for ease of finding the damn parts!

Anyway to run M47 crank, with shaved S52 pistons? Assuming the M47 crank is 87.9mm stroke, with S52 pistons of 86.4mm then the displacement would be roughly 2061cc?

Still, what headgasket is used?

The M47 has 88mm stroke. It can be bought directly in a BMW dealer, but prepare $1000.
This crank is from a diesel engine, so not likely to be found on the states.
Look on ebay germany, I bought mine there, and the guy would ship worldwide. Right now the Euro/dollar is pretty high, so an M47 crank for €500, would really be about $750 plus shipping to the states (at least another $150), so if I were you and interested on an M47 crank, go and buy a new one.
With S52 pistons the displacement is 2064cc
I have heard good and bad things about MLS gaskets, cometic doesn�t build them in 87mm,only 85, and 86mm. Metric mechanic shave a little bit of the corner of the top of the piston so it doesn�t hit the gasket at TDC
On my engine (S52 86,4mm) I used the stock M44 gasket being 86mm, at the edge of the cilinder hole, the gasket is rounded, so really where it seals with the block, it really makes a little more, maybe 86,5mm. so I�m safe there(anyways my deck height is 0)
The engine runs perfect and has perfect compression on all 4 cylinders.

For the guys talking about turbo:
If this guy is talking about running on some kind of competition, with a rulebook, limiting the engine to 2.0L, I doubt turbos would be permitted on the same category...
Of course a turbo would give him at least 300hp, and he would be interested on putting a turbo, I would have said so...
Good luck!

crazzy_hippo · « **Reply #8 on:** October 21, 2008, 04:00:14 AM »

Quote from: hesgone2fast;59039

The M47 has 88mm stroke. It can be bought directly in a BMW dealer, but prepare $1000.
This crank is from a diesel engine, so not likely to be found on the states.
Look on ebay germany, I bought mine there, and the guy would ship worldwide. Right now the Euro/dollar is pretty high, so an M47 crank for �500, would really be about $750 plus shipping to the states (at least another $150), so if I were you and interested on an M47 crank, go and buy a new one.
With S52 pistons the displacement is 2064cc
I have heard good and bad things about MLS gaskets, cometic doesn�t build them in 87mm,only 85, and 86mm. Metric mechanic shave a little bit of the corner of the top of the piston so it doesn�t hit the gasket at TDC
On my engine (S52 86,4mm) I used the stock M44 gasket being 86mm, at the edge of the cilinder hole, the gasket is rounded, so really where it seals with the block, it really makes a little more, maybe 86,5mm. so I�m safe there(anyways my deck height is 0)
The engine runs perfect and has perfect compression on all 4 cylinders.

For the guys talking about turbo:
If this guy is talking about running on some kind of competition, with a rulebook, limiting the engine to 2.0L, I doubt turbos would be permitted on the same category...
Of course a turbo would give him at least 300hp, and he would be interested on putting a turbo, I would have said so...
Good luck!

Hi! Could you share about what are the parts you have used to build your motor?

Thanks!

1991 E30 M42 · « **Reply #9 on:** October 22, 2008, 12:15:34 AM »

I am so glad that someone posted something on here that didn't involve a turbo. Thank you so much, I thought we were being invaded by Honda kids that got their hands on a BMW and want to put a fart can and a turbo on everything. Check out the thread on my build with m44 crank rods and pistons in an m42 block that came out to 1917cc. here if you want to know anything in particular about the build process or any specs or prices, just post it or shoot me a PM.

nickmpower · « **Reply #10 on:** October 22, 2008, 12:32:54 AM »

the crank is like 750 with bearings from bma auto parts

Reicho318is · « **Reply #11 on:** October 22, 2008, 12:55:57 AM »

Yea im with u 1991 E30 M42. I hate it when you see some riced-up BMW and to top it off the loser cant even drive. Not that im saying tuning a BMW is bad. Just ricing 1 is. Anyway! Ive attempted to do this aswell. but the engine had cooling problems and blow in its first test. I sort of did something like that 3rd opion that was listed. but i got a crank custom made.

hesgone2fast · « **Reply #12 on:** October 22, 2008, 02:59:46 AM »

Quote from: crazzy_hippo;59041

Hi! Could you share about what are the parts you have used to build your motor?

Thanks!

I have used:
-M42 E36 block
-M47 crank
-S52 pistons
-M42 E30 rods
-M42 E30 head,fully rebuilt,shaved 0,2mm, fully ported, 6mm valves, MM bee-hive springs, MM retainers and shims
-Schrick camshafts
-Schrick lightened hydraulic lifters
-MM heavy duty, trimetal, teflon coated rod bearings
-MM 360� main bearings
-MM head bolts
-E36 M44 86mm headgasket (thicker than stock)
-All new chain, guides, E36 tensioner, gaskets.
-E36 Serpentine belt system

In progress:
-E36 M3 (S50)inline throttle bodies

JP 91iS · « **Reply #13 on:** October 22, 2008, 11:04:19 AM »

Quote from: hesgone2fast;59209

I have used:
-M42 E36 block
-M47 crank
-S52 pistons
-M42 E30 rods
-M42 E30 head,fully rebuilt,shaved 0,2mm, fully ported, 6mm valves, MM bee-hive springs, MM retainers and shims
-Schrick camshafts
-Schrick lightened hydraulic lifters
-MM heavy duty, trimetal, teflon coated rod bearings
-MM 360� main bearings
-MM head bolts
-E36 M44 86mm headgasket (thicker than stock)
-All new chain, guides, E36 tensioner, gaskets.
-E36 Serpentine belt system

In progress:
-E36 M3 (S50)inline throttle bodies

Nice. When you ordered your MM stuff, did you consider using their single row timing chain? I'm trying to find out if they even sell it separate from one of their built engines.

hesgone2fast · « **Reply #14 on:** October 22, 2008, 11:59:42 AM »

Quote from: JP 91iS;59215

Nice. When you ordered your MM stuff, did you consider using their single row timing chain? I'm trying to find out if they even sell it separate from one of their built engines.

Yes I did consider it, MM says they trust more the single chain setup than the double chain. At this point of build up, where I push so much an engine, I trust more the strength of double chains. Yes, sure is heavier, but In terms of horspower gains, I would say 0hp is an aproximate gain with the single chain. Sure it will rev faster because of rotating mass and all that, but I built my engine for low end torque and power, so I�m not to worried about that.
For high revving, racing engines, it would be a great upgrade, but to me, not worth the extra $200.