M52 crank machining

[nando]

S52 rods are pretty light, strong and at least they used to be cheap.

[zaq123]

Update for this post.

will not be touching/cutting the crank and going with 135 rods and IE Mile pistons.

M52 crank clears my block nicely. They only area where it comes close is the oil return. Not my pic but the crank clears with about 1.2mm clearance there. Should I still grind the block? What # would you recommend as far as crank to block clearance goes?






Andrew's pic. My M52 crank actually clears there with the above mentioned clearance

I think I'm going with new 85mm pistons and 135mm rods. Better R/S ratio than 130mm and no 160k mile pistons. After all....this is supposed to be a project :)

Any reason to go IE/Mahle vs custom JE for $200 more? Also looks like schrick and dbilas cam is about the same price.. The head has new OEM springs: should I go with dbilas 284/284 or schrick 284/272? I trust schrick but do not know much about dbilas cam.

[digger]

0.080-0.100" is more than enough.

[zaq123]

0.080-0.100" is more than enough.

mine is just one half that, 47 thou. I guess I should grind it?

[ForcedFirebird]

mine is just one half that, 47 thou. I guess I should grind it?

Rods can stretch .040+ (why you want piston to head clearance) - would be difficult to measure crankshaft wobble, but I would personally go close to .100" as possible to be safe...

[digger]

mine is just one half that, 47 thou. I guess I should grind it?

i would just to be sure, the counterweights in all honesty wont grow that much but the crank can also float axially close to 0.2mm, given its a 30 sec job to grind that area with a die grinder, its not really worth risking

[mikerob97]

nice thread - if anyone reading is interested, I have an extra crank spacer and a set of eta 130mm connecting rods available for a 2.8 liter stroker build that I never used. PM me if interested.