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  #1  
Old 06-13-2015, 10:21 AM
rioredstang rioredstang is offline
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Default machining the deck?

Ok. I have mocked up my new motor and started checking clearances. The piston is about .110 down. How much can you take off safely? Seems like .100 is alot to remove.
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Old 06-13-2015, 11:04 AM
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You have to account for rod/piston stretch as well as thermal growth. 0.010" of piston recess sounds reasonable with a 1.1 mm compressed headgasket, but at high RPM maybe it's an issue.

The 0.110" recess sounds odd though. I don't recall seeing anything remotely close to that in my SR bottom end.

What's the story on your build?
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Old 06-13-2015, 12:27 PM
rioredstang rioredstang is offline
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Ka24de
Carillo rods-BC crank-JE pistons
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Old 06-13-2015, 06:41 PM
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It honestly sounds like a bit of a stackup problem to me.

I would cc the head and the piston dome + recess, then calculate your CR with a normal HG. I'm betting it's way out of spec...
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Old 06-14-2015, 12:05 PM
rioredstang rioredstang is offline
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Is it safe to remove that much from the block. I worry about timing problems
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Old 06-14-2015, 08:19 PM
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That is a lot to remove. Service limit is a fraction of a millimeter IIRC.
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Old 06-15-2015, 06:13 AM
Matt93SE Matt93SE is offline
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I wonder if the pistons you bought were some lower CR ones for turbo applications, or the pin height is wrong? That just doesn't sound right for an NA build..
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Old 06-15-2015, 07:11 AM
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It sounds to me like something if off as well, that's why I suggested measuring actual CR vs. advertised. I'm betting either the wrist pin height or rod length is off for the crank stroke.
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Old 06-15-2015, 11:10 AM
Matt93SE Matt93SE is offline
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Aftermarket rods, crank, & pistons.. so you never know.. might measure complete stroke while you're at it to see where things are. does the BC crank have shorter stroke? stock rod length?
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Old 06-15-2015, 03:18 PM
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I think it's a longer stroke that can get you like 2.5-2.6L.
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