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Old 05-17-2020, 01:00 AM   #1
kayaker43
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Member#: 433825
Join Date: Nov 2015
Default 06 STI flywheel bolts seem too short.

This is a frankenmotor build for a buggy. Im using an EJ 257 block from an 06 STI and an exedy flywheel /clutch kit. I researched flywheel bolts and it seems like they all use the same 10x1.0 x 24.5 from 2002 to 2020. However they only seem to have 6mm thread engagement which looks marginal to me.

Can anyone confirm this is correct?
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Old 05-17-2020, 09:56 AM   #2
kayaker43
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OK,.. learning more about this. My new 06 STI short block never came with a flywheel but It seems all Subaru's have the same crankshaft bolt pattern and will fit either 5 or 6 speed flywheels. I am using a dual range 5MT transaxle from an Australian Forester and it uses a push type clutch. I bought a clutch/ flywheel kit from a Forester of that era and the flywheel bolts right up and uses the 6 bolt 5MT pressure plate. It seems like my parts set is compatible but the flywheel to crank bolts only have a 6 mm thread engagement.

Looking at some flywheel pics, some have a flat center section and others have the bolt pattern spot faced a 2-3 mm which will sink the bolts and add thread engagement. I noticed two torque specs and am wondering if the higher number is for those with spot faced flywheels and more thread depth?
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Old 05-17-2020, 10:12 PM   #3
kayaker43
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Well no help for me here,...

if anyone else stumbles on this thread with the same issue, here's what I did. I was not at all comfortable with 6mm thread engagement so I set the flywheel on a mill and spot faced each hole with a .750 end mill to a depth of 3mm. The center of the flywheel is very thick so no concerns about weakening it. Now I have 9mm thread engagement on a 10mm Bolt which is a little more than a standard nut thickness. I now feel comfortable using the slightly higher torque spec for the STI.
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