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2.8L M20 9.8:1 stroker build: my 323i reincarnated

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  • betz
    replied
    New main bearings, clearances checked via plastigage



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  • 2mAn
    replied
    Oh man, this is going to be so good! I already love it

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  • betz
    replied
    New intermediate oil pump shaft bearings (Order using part number, had machinist fit them via procedure described here... http://www.e30tech.com/forum/showthread.php?t=95546)



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  • betz
    replied
    Originally posted by LateFan View Post
    Burgundrot is a good start.

    Sad to lose a 323...was it euro bumpered?

    What does the knurling do on the skirts?
    It twas. Forgot to mention, the front got a little mangled, but I've already swapped the rear onto the "e". I'm looking into straightening the front but there's hardly any chrome bumper shops around anymore.

    Knurling helps hold oil at the edge of the skirt. Its also allows a worn piston skirt to perform more like a new one because knurling raises the edges of the skirts up, so that it fits tighter.

    It also looks cool.

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  • LateFan
    replied
    Burgundrot is a good start.

    Sad to lose a 323...was it euro bumpered?

    What does the knurling do on the skirts?

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  • betz
    replied
    Meanwhile, pulled the engine out the 325e and put the Z3 steering rack and ground controls from my 323i in.





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  • betz
    replied
    Block painted aluminum color, high temp engine block paint.



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  • betz
    replied
    The pistons were knurled and the whole assembly was balanced...



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  • betz
    replied
    Crankshaft turned, rods and pistons glass beaded, piston skirts shaved. Also got my company to machine me a spacer for the front crankshaft oil seal.





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  • 2mAn
    replied
    please keep posting more progress

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  • betz
    replied
    Got the block hot tanked, then shot peened..



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  • betz
    replied
    I pulled the 731 head from the 323i, got the head inspected by a machinist but it needed new valve guides. I was planning on using valves from this 885 head I picked up, but he said he could't make them fit easily. So, I decided to go a different route...

    E36/E39 84mm M52 crank, 325i short skirt pistons, eta rods, 885 head. 2.8L, 9.75:1+ compression. My machinist decked the head and measured the squish band clearance, so it could easily be closer to 10:1. 5mm off the block is standard to bring it to normal clearance. Here's some general info on the 2.8 build: http://www.e30zone.net/e30zonewiki/i...Building_a_2.8
    Last edited by betz; 09-18-2017, 07:49 PM.

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  • 2mAn
    replied
    Originally posted by betz View Post
    Yeahhhh the photos were way too big. Undid it and compressed them. More incoming...

    And what trim? From the 323i?
    No, the diving board. Its missing in the pic. Trying to make some front delete panels since nobody else.

    BTW Im VERY curious about the 2.8L M20 build so I will be watching closely

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  • betz
    replied
    Originally posted by 2mAn View Post
    Took you long enough to post pics! hahah

    Where is the rear trim? lemme have it
    Yeahhhh the photos were way too big. Undid it and compressed them. More incoming...

    And what trim? From the 323i?

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  • betz
    replied
    Car had a "blown head", didn't care since I already had a "e" block in the works for a 2.7 stroker for my 323i.



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