Spare M42 refresh/rebuild

[fresh_TD]

Small update: S52b32 pistons came in the mail yesterday. I cleaned 4 of them, and I'm about to drop off the block/pistons at machine shop in a little while.

S52b32 pistons



Comparo: left M42, right S52



Top M42, Bottom S52




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[varg]

Looking good. What are the specs going to be? Bore, Rod length, HG thickness, Piston Dish, Static Compression Ratio etc? I considered building a stroker M42 to replace my stock engine but when I looked into it the cost of a 2L stroker M42 build was more than a 2.8L stroker M20 so I'm going with the M20.

[fresh_TD]

Looking good. What are the specs going to be? Bore, Rod length, HG thickness, Piston Dish, Static Compression Ratio etc? I considered building a stroker M42 to replace my stock engine but when I looked into it the cost of a 2L stroker M42 build was more than a 2.8L stroker M20 so I'm going with the M20.

Thanks..bore 86.4mm, rods 140mm (m42), compression goal is 11.5:1.. if you know how to source, it doesn't cost that much. I will be less then $2k when said and done with this build, and this is including $700 worth of new timing components;-)

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[roguetoaster]

I'd be impressed if you can pull of a quality rebuild of a stroker M42 for sub 2k including timing gear. Will have to get the details from you at the meet.

[CharlaybitM3]

Good looking build. What machine shop did you end up using? I'm out in Centreville and have a spare M50 laying around that I hope to start building into a high compression M50/S52 hybrid for my 318 in the next year or two.

[fresh_TD]

Good looking build. What machine shop did you end up using? I'm out in Centreville and have a spare M50 laying around that I hope to start building into a high compression M50/S52 hybrid for my 318 in the next year or two.

Performance Machine inc. in Springfield, VA

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[CharlaybitM3]

Thanks!

Question... why are you upping the compression if going turbo? Or are you going to run corn juice?

[fresh_TD]

Thanks!

Question... why are you upping the compression if going turbo? Or are you going to run corn juice?

If I raise compression, I won't turbo this engine. I'll turbo the engine that's in the car right now, later on. I'm leaning more towards keeping this one NA.

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[fresh_TD]

Block is done, bored, honed. Head is almost done, except somehow FCP sent me the wrong valve stem seals, not a big deal though..





Pic of oil squirter that go underneath the main bearings..I lost one of them:-(



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[roguetoaster]

Sweet! I'm really excited to eventually see a worked N/A M42 in person.

[fresh_TD]

M47 crank finally came in from the UK.. few pics to compare both M42 & M47 cranks.

M42 left, M47 right











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[roguetoaster]

What's the weight difference?

[fresh_TD]

What's the weight difference?

Not sure, but I'll weigh them both in the next few days to find out

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[e30s50dan]

Sub'd. Nice progress

[fresh_TD]

New oil squirters, and new oil pump came in today.




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