M42 Project started! (S42 Replica)

[nickmpower]

Wait, what? how do you need to replace just the crankshaft?

[nickmpower]

Wait, what? how do you need to replace just the crankshaft?

[sjpgoalie]

the m42 and m44 rods are both 140mm long. m44 crank has 83.5mm stroke and m42 has 81mm stroke. skimming the head 2.5mm is probably not a good idea.

depends on the condition of the crank. light surface rust can be removed by hand with a clean rag and oil. if the bearing surface on the crank shaft is in good condition than it should be ok to use. if your not sure on what to look for when checking the condition of the crank shaft than have a good look on google.

I'm not saying skim the head that much, but why would it be a bad idea? Per Jim @ Metric Mechanic, you can shave nearly 1.5mm without running into timing tensioner travel issues and he would be right about stock compression. Or he could keep that same deck and head height on the m44, use M20 pistons which are 4mm taller and same diameter with a lower wrist pin, lose 2.5mm with the m42 crank and he could probably get away with the stock head gasket, which compresses to about 1.4-1.5mm or possibly use a thicker one if clearance is problematic. It would be close if so. Just thought of that. Not sure if it has been done before.

[DailyE36]

^ i think the problem with m20 pistons is they only have two grooves cut out for the valves instead of four. in reality the cheapest way to have a m42 rotating assembly in a m44 would be to use a m42 block and m44 head. but its always interesting to see what parts will fit what engine.

i was brainstorming ideas one night about a cheap way to make a 2L m42 with the m47 crank.
m42 crank 81mm - m47 88mm = + 7mm
m42/44 rod 140mm - m50 2.5L rod 135mm = -5mm
m44 pistons apparently sit 2.5mm lower than m42 pistons.
so 7mm -5mm -2.50mm = -0.50mm.
if anyone understands that then this could make a 2L m42 using m47 crank, m50 2.5 rods and m44 pistons. this is just a simple (what parts will fit) that i was thinking about one day, so this is not accurate. but it can give some one something to think about if they want to make a m42b20 on the cheap side.

il go and collect it in a while and check it, i know roughly what im lookin at
but not a pro

i looked at the crank last week pulled off my sump was fairly handy job,

decided il try changing the crank shaft i must tchange the clutch anyway so i can do 2 jobs at once il let you know how i get on with this crank shaft

thanks for your help lad

so why do you need a new crank shaft anyway?

[stevie171]

first of all i picked up the crankshaft looks fairly good,

couple of weeks ago my bottem end started rattling for what reason i dont know, i havent been drivin the sh*t out of it or anything and i always check the oil levels,

but the crank would have too b ground down as the bearing part has gone very rough,

the m42 i have has a bent valve also so cud change the head also,
im just looking for a cheap fix for the moment as strapped for money at the moment,

2lm42 sounds very nice

[sjpgoalie]

You sure it's not just a lower tensioner rattling?

[stevie171]

You sure it's not just a lower tensioner rattling?

no i had the shell bearings out and dar past there prime plus theres alot of metal shavings in my oil looks like the sump is full of gold haha

[stevie171]

just started rippin my engine now il make a new thread n throw a few pics up wit my progress :P

[DailyE36]

im not sure who will be interested in this but i found it while on google.



http://www.ebay.co.uk/itm/BMW-E36-31...item3a7811a7dd

[mim2end]

can we revive the thread ? any ideas how can we run gizmos set up but without any add on to the ecu ? If I use M44 for the project and throw M42 head and rods in ? M44 has a MAF so no need for a piggy back . and could the stock ecu be remaped to cope with all the mods ? couse in Ireland there is NO/or a few hiding that can tune add management systems . and they would cost me (including piggyback) more than a new car .
I recently found a complete M44 for sale for 170E :O so if I could get away with using a remaped original ECU I would go ahead with the mod . and prob start a new thread with HOW TO info so anyone can do it . PLEASE keep this going for generations of M4x lovers to come

[DailyE36]

the stock ecu can only be tuned so far, thats why people use piggyback or aftermarket ecu. the stock ecu is limited.
a m42 head bolted onto a m44 block will not gain more power because they flow the same, the only noticeable thing would be smoother revving in the top end of the rev range.
m42 rods are the same length as m44 rods (140mm) and the m42 rods weigh more, m44 rods are better for reving and reduced engine mass.
if you want to mod the 4 banger its best to get the m42 because there is more parts and info on them. also they are a better engine for hi reving. apparently bmw made the m44 to reduce engine noise by slightly increasing the capacity, and lower emissions. i have seen the m44 block/m42 head thing done befor but not sure if its the best thing. the cam shafts in the m44 help balance the engine. if you were to put a m42 head on then the engine may not be balanced properly.
so befor you decide on anything. how much power do you want and how much do you want to spend?

[shervin]

I have a question dear friends
please someone tell me that is there any difference between M42 and S42 cylinder head?
I heard that S42 has 8 injector (2 per cylinder) is that right?
how is the arrangements of injectors?
I couldn't find any picture

[granlund]

There is a huge difference between an M42 and S42 head. The latter were custom built to adhere to regulations of a "stock engine" for lower cost, while producing maximum hp at 8500rpm.

For example, the regulations stipulated that the valve angles had to stay the same. Some creative engineers realized that by adding and milling material, the entire head could be tilted on the block such that the intake port was more vertical for better flow (but the valve angle in the head remained the same). In the final years, these SuperTouring car engines had the same BMEP as Formula1 engines.

[shervin]

Thanks a lot...
would you help me to know about the number of injector? 2 injector per cylinder?
are the intake ports similar to S52 head? divided port for each valve like this?
http://www.overpic.net/viewer.php?fi...xdpjzlwwzc.jpg

[DailyE36]

a s42 cylinder head...













block





yep, this is the real deal
and the s42 has 2 injectors per cylinder, the second bank fires up after a certain rpm.

[shervin]

It's been very help full about the second bank injectors, many thanks...

unfortunately I can't see the images
give me the links please

[DailyE36]

hope this works.
http://i244.photobucket.com/albums/g...s/DSC00861.jpg

http://i244.photobucket.com/albums/g...s/DSC00853.jpg

http://i244.photobucket.com/albums/g...s/DSC00856.jpg

http://i244.photobucket.com/albums/g...s/DSC00857.jpg

http://i244.photobucket.com/albums/g...s/DSC00858.jpg

http://i244.photobucket.com/albums/g...s/DSC00863.jpg

http://i244.photobucket.com/albums/g...s/DSC00860.jpg

http://i244.photobucket.com/albums/g...s/DSC00859.jpg

[shervin]

many thanks.......

[Rokkuman]

Many of the S42 pictures Ive seen are from the touring cars, Has anyone seen the s42 engine from the f3 cars that are belt driven instead of chain driven? I have pictures saved so I can post them later, but does anyone have info on those f3 engines?

[mim2end]

I'm not looking for big increase in hp. I know what piggyback is for, was just wondering if gizmo mod would be possible without it(his engine ran without it after the mod, he added it later to get rid of the flapper and further tune the fueling). it is not a big increse in fueling if using M44 as it is already 1.9 so in theory original ECU <SHOULD> cope with a good map - and as far as I remember Gizmo used M44 block for his project with M42 head. so there shouldn't be a problem. Using M44 would sawe some some as it has MAF. I have no practise with fueling or timing thus all the questions. any critisism welcome .
ps. after geting as mutch as possible out of NA I hope to add a turbo with a programed chip or something ?

[bme30]

Im working on a mild m42 build

I already made custom itbs with gsxr750 itbs with a fiberglass plenum
Still using the afm but upgraded to s52 injectors
Tuned with tunerpro rt / ostrich2.0

Im picking up a spare m42 to rebuild but i have one question.

Are the pistons some of you are using from the m50b25 or the m50tub25?

thanks

[405style]

Hey guys, I have been focusing on my 330i lately with the mods, she is finished! Now that she is out of the way I can set my focus back on the E36.

Here is a recent shoot with the track wheels and revised interior.








As for the engine, I must do the ITB install next. I have been thinking about using the spare M47 crank in my cupboard and finding a block to build into a low compression 2044cc engine, then a turbo with alot of tricks.
But trying to find time between my gf and working on other cars is difficult, not to mention how expensive being in a relationship can be...

How did you fit that steering wheel?

[Silver85]

South africans were gifted a few 2.1 homogolation M42/44's for touring car racing,what ever happened to those?
Seen only 2 of them,both of them were in 95 e36 318is Motorsports.

Thanks for hours of reading,didn't know M47 cranks could be used in M42/44 blocks,i also thought of VW mods when i read this,you're a smart guy.

[Estoniabmw]

Welcome.
I've read about this topic, but still have questions.


I have a m42b18 engine. I want to make it as 250hp '+. What things do I need to use?
M3 pistons, a lot needs to change them.
88mm vs 90mm M47 (N) crankshaft. Cylinder head port. With connecting rods?
Is the original intake sufficient?


Sorry mistakes.

[Kellu]

Well, I have finally started my project to build a replica S42B20 motor.

I pulled my 318i into the garage on monday and removed and stripped the M42B18 down to its bare components. Afew months back I got hold of a M44 sub-assembly and started by stripping it down and cleaning it up. I had it bored out from 85mm std to 86mm to fit Euro M3 3.0lt pistons.

At this stage I was going to use the M44 crank which had an 83.5mm stroke but found out that a M47 (E46 320d) crank might fit, it did. Now I have an 88mm stroke. The nice thing about the M47 crank is it has the same dia. big-ends and main bearings as the M42/M44. And its a forged crank! With the 86mm bore and 88mm stroke its now a 2045cc motor (nearly a 2.1lt). With M3 3.2lt pistons it would be a 2069cc. I am using the M44 rods for the job, the pistons are being decked and pocketed this week, this will make 'em flat-top and raise the compression some too.

Once I get everything back from the engineers I will have the whole bottom-end fully balanced and look into that stupid harmonic damper...
I got some quotes today for Euro M3 throttle bodies and will get a set of 6 next week which will cost me R2500=$375. I will remove the two center ITBs and I will be using the 300cc M3 injectors and the Euro M3 plenum chamber but cut off the two ends to make it work with the 4 ITBs.

As for the head, I will buy another M42 head at a later stage and fit M3 3.2lt 35mm intake valves, cut them 3-angle along with the 30mm exhaust valves. Gas-flow the head and finish off with a nice polishing and a skimming to raise the compression even more. I will fit the solid lifters from the Euro M3 too so I can rev it over 7500rpm. I have only found one set of cams that I can use which are made by Schrick. They have a 256 duration and a 10.4mm lift, I think they will be a little small for what I want. Can someone point me in another direction??? Custom cams or some other company makes M42 cams already?

The exhaust system I have should be alright for now, Im using the M42 manifold coupled to a custom 57mm s/s freeflow system with twin staggered chrome tips. I will change the tips to a single smallish chrome tip to give it a sleeper look, hehe. When I get the other cyl head done I will get some custom 48mm exhaust headers made up.

As for the management, I will be using the std Bosch DME with a Dastek unichip. I could look into a stand alone system at a later stage but its not that neccesary for a normally aspirated car. The guys at www.kempower.be manage 315hp out of a normally aspirated S42B20 with the Bosch DME so it should be good enough for me...

So this is a lot to take in. I want to do something similar to this but I'm not sure if it will work. Could I put in the 300cc M3 injectors and the Euro M3 plenum chamber, 88mm m47 crank, std Bosch DME with a Dastek unichip and leave it at that without any bore or m3 pistons ect and it work? Would that even make a significant gain in power? I would also want to do lightweight cams in the head if they are even on the market for this engine. You seem to be the m42 yoda so I would greatly appreciate your advice.