FS: Built stroker m20 motor
-2.7l eta block, bored to 84.5mm, then final bore and honing done after pistons were received for the tightest fitment. Hotanked.
-New OEM rod and main bearings
-s50 crank and rods
-JE forged pistons with heavy duty wrist pins 8.5:1 CR, 84.5mm bore, new JE rings.
-"885" rebuilt head by Spokane cylinder head service, resurfaced to RA50
-MLS .140 HG
-rotating assembly balanced and blueprinted
With a bore of 84.5 and stroke of 86mm final displacement is 2.9L(2.897) with a final CR of 8.5:1.
All parts inspected and machined by O'Neil's custom engines in spokane. Meant to handle 400+whp. s50 rods weigh 555g which is about 150g lighter than a stock eta rod, and in the range of most aftermarket H-beam rods. Gotta love the engineers at BMW.
I spent A LOT of time researching to build this stroker turbo motor. Many talks with Steve at TopEnd Racing and the e30tech gurus. I've invested about $3.5k in parts and machining alone.
I'll let it go for $2500. Hasn't been assembled yet, but will be co-assembled by JJ(ASNW autocrossers will know him) and myself. Pics to come soon. I am not opposed to parting it out. The only thing it's missing right now are its ARP headstuds which are on the old motor and have only been torqued down once and are fine to re-use.
-2.7l eta block, bored to 84.5mm, then final bore and honing done after pistons were received for the tightest fitment. Hotanked.
-New OEM rod and main bearings
-s50 crank and rods
-JE forged pistons with heavy duty wrist pins 8.5:1 CR, 84.5mm bore, new JE rings.
-"885" rebuilt head by Spokane cylinder head service, resurfaced to RA50
-MLS .140 HG
-rotating assembly balanced and blueprinted
With a bore of 84.5 and stroke of 86mm final displacement is 2.9L(2.897) with a final CR of 8.5:1.
All parts inspected and machined by O'Neil's custom engines in spokane. Meant to handle 400+whp. s50 rods weigh 555g which is about 150g lighter than a stock eta rod, and in the range of most aftermarket H-beam rods. Gotta love the engineers at BMW.
I spent A LOT of time researching to build this stroker turbo motor. Many talks with Steve at TopEnd Racing and the e30tech gurus. I've invested about $3.5k in parts and machining alone.
I'll let it go for $2500. Hasn't been assembled yet, but will be co-assembled by JJ(ASNW autocrossers will know him) and myself. Pics to come soon. I am not opposed to parting it out. The only thing it's missing right now are its ARP headstuds which are on the old motor and have only been torqued down once and are fine to re-use.
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