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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 02-27-2013, 09:28 AM   #1
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3.4l Stroker Motor

Sooo, I have an 03 M with an Active stage 1 supercharger kit. Has been ridiculous fun. Recently it started idling weird and blowing oil from the vent hose on the valve cover. Took it to the local performance shop and found out I have damage in cylinders 1 and 5 and will need a motor. The shop quoted me for a built 3.4l stroker setup and I was wondering if anyone had any experience with this sort of animal? From what I was reading I could expect much more torque. The shop said this thing should stand up fine to the 9-10 psi of boost I'm running. Any complaints, comments, warnings? I drive the hell out of this car and will probably put somewhere around 15-20k miles on it a year if I keep it. Just want to make sure I don't go drop some major coin on this and have the blower destroy everything again.

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Old 02-27-2013, 10:54 AM   #2
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The only concern that I would have about a stroker engine for the M3 would be piston velocities at redline. Longer stroke equals higher piston speeds at any given rpm. Higher peak velocity equals greater wear and greater stress on connecting rods. You already have forced induction, and this will add additional stresses. If the builder is both experienced and reputable you should be okay, but I would consider everything carefully.

Last edited by DSilk56; 02-27-2013 at 10:55 AM.
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Old 02-27-2013, 11:32 AM   #3
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If you decide to go back to N/a lmk about your AA kit. I'm also in VA.
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Old 02-27-2013, 02:19 PM   #4
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There was a thread on m3forum about a guy who did it but I think he stayed NA. Ask on there. What shop is going to do it?
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Old 02-27-2013, 07:44 PM   #5
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Originally Posted by illestminimike View Post
There was a thread on m3forum about a guy who did it but I think he stayed NA. Ask on there. What shop is going to do it?
Thanks for the info. RRT in Dulles, Va has the car now. Not sure if I'm gonna have them do the work though. I've asked around and seems like they are a bit over priced.
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Old 02-27-2013, 07:59 PM   #6
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If it ain't a VAC build I would t do it. They've been stroking S54s long enough to know how to do it right.
This engine already has crank bearing and connecting rod pots goal "issues" already, can't imagine stroking AND boosting it will make these things any better. So the build MUST be done right.
Originally Posted by rohde88 View Post
^^^ do you spend all your free time on two wheels?
The Snikster posted sexy wiminz here
Do you ride a sportbike?
Do you have a question about Jamaica? Ask?
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Old 02-28-2013, 12:22 PM   #7
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if not redone with some AA's help how about http://forum.e46fanatics.com/showthr...e+motor+repair(maybe enquire about)

I could see this happen to alot of us boosted owners, I hope you get it back on the road, stronger and better.

"Can it be, we've run out of time? You're alive.. ohhh? In these streets we living to die. When it's your time, you will know..
..cause it ain't hard to tell. "

Last edited by MachRc; 02-28-2013 at 12:23 PM. Reason: Auto-save 1362075789
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