Author Topic: stroker m42 engine (Read 6834 times)

IStourerD · « **on:** February 10, 2010, 05:57:32 AM »

hi there!
i was hoping to build myself a stroked m42 engine sometime this year and i was hoping that someone could provide me with a comprehensive list of engine parts i need to build it.
any advice/ help or anything would be really great!
thanks
D

longms · « **Reply #1 on:** February 10, 2010, 09:19:00 AM »

VAC Motorsports sells a kit...check it out

http://store.nexternal.com/vacmotors/stroker-kit-c153.aspx

Not sure if the 1.8L kit goes with M42 but something to start you in the right direction.

dvmotorsports · « **Reply #2 on:** February 10, 2010, 11:39:57 AM »

Yeah I looked that over. While it states BMW this and BMW that, the 4AG is referenced. The 4AGE and 4AGZE are Toyota motors from the 80's. So I don't trust that link info. You should call VAC instead.

Warsteiner · « **Reply #3 on:** February 10, 2010, 12:59:42 PM »

There are so many factors to look at when building a stroker motor. Everything from intake to cams to rev limit to exhaust. It all plays a role in the complete motor idea. Some are compression and what type of tuning are you going to use, AFM, MAF, MAP or Alpha N with a custom chip or stand alone system. Street car/track car on pump gas or track car on race gas. Custom pistons and rods or other sources that will work without going new/custom.

To date I don't know of any kit that is available for the M42. Many people have done so many different combinations of components. You can definitely fit a lot of stock BMW parts from other models in our motors as well as parts intended for other car manufacturers. I have personally done both. You can learn so much from getting all the information and figuring out what will work:-)

While planning my motor I had thought everything through several times making sure that is the best possible direction for me. Custom cams were a must for me. Porting was another one since the power is in the head. Stand alone management to handle the Alpha N and MAP blending with added compression along with an E30M3 exhaust system to get all that flow out of the motor. The valve train has been lightened with 33mm lifters, beehive springs, and 6mm valve stem valves. Pistons were cut and pocketed and dished to match cams and change in stroke along with getting the proper compression. The other major one is if you go the M47 crank route, you'll need to turn down the nose as well as cut a second keyway. I also lightened my crank at the same time. Everything that was touched was either lightened or improved upon. You can go with other avenues and just change pistons or pistons and crank and rods. Many many variables according to what your budget is.

I have no idea how much power this motor will make but I will do a complete write up as soon as it's up and running which will be really soon.

Cheers,
~Ralph

PS Anyone in the NJ Shore area is welcome to come and take a ride when it's all finished. Should be a blast!

Donkeyshins · « **Reply #4 on:** February 18, 2010, 02:14:48 AM »

Go to http://www.metricmechanic.com/prices/pricing-engines-kits.php and scroll down about 3/4 of the page.

M42 & M44 Engine Kits - M42: E30 318is '90-'91, E36 '92-'95, Z3 '95 M44: E36 318ti '96-'98, E36 318i '96-'98, Z3 '96-'98

2000 HiFlo ST Sport M42/M44 Engine Kit 160-170 HP $3,435 + Full Kit Discount
HiFlo ST Sport Head*, 6% Flow Increase $1,495 $600
Head Upgrade, from 7mm to 6mm Valvetrain $300
Sport Intake Camshaft $450
Head Gasket $110
Pistons, Sport 87mm Forged Alusil 10.0:1 CR $780
Rings, 87mm Moly Rings $120
Rod Bearings, Sport Aluminum Face $60
Main Bearings with 360� Thrust Oiling Groove $120

2100 HiFlo ST Rally M42 Engine Kit 205 HP $5,995 + Full Kit Discount
HiFlo ST Rally Head*, 6% Flow Increase $1,495 $600
Head Upgrade, from 7mm to 6mm Valvetrain $300
Cam Pair, Intake 272� & Exhaust 258� $900
Head Gasket $110
Pistons, Rally 87mm Forged Alusil 11.5:1 CR $780
Rings, 87mm Moly Rings $120
Rods, Rally 138mm, UltraLite "I" Beam Rod, 475 grams $780
or Rods, Rally 138mm "H" Beam Rods, 520 grams $780
Rod Bearings, Teflon Coated Tri-Metal $140
Main Bearings with 360� Thrust Oiling Groove $120
M42 88mm Forged Steel Crank Kit $1,250

Keep in mind you'd probably want to add a lightened flywheel ($875) and a pulse chamber intake manifold ($1000), but I'd be surprised if there wasn't some sort of discount on these items.

-D