Valve Shimming - which side of spec?

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Valve Shimming - which side of spec?

bflint Offline

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#1

01-30-2021, 05:18 AM

Getting ready to re-shim my valves after 52K miles. Recommended shim sizes (per calc) either put new clearance on low side or high side of spec (IN 0.006, EX 0.011). I noticed, via calcs, that I could deviate from the recommended shim size to push new clearance from low side to high side or vice versa, while still staying within spec range of +/- 0.001. WHY? Because I noticed that the measured clearances historically show the EXHAUST getting tighter (or staying the same) and the INTAKE getting looser.
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The recommended shim size for EXHAUST is fine, but I have two choices for INTAKE. For INTAKE I have choice of 0.065 (recommended) or 0.051 new clearance. I was thinking I should pick 0.051 with the assumption that they will loosen over time.
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General mech theory states that looser is safer. Am i crazy to go to the tight side? Thoughts?

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Messages In This Thread

Valve Shimming - which side of spec? - by bflint_imp - 01-30-2021, 05:18 AM

RE: Valve Shimming - which side of spec? - by the Ferret - 01-30-2021, 05:20 AM

RE: Valve Shimming - which side of spec? - by Tev62 - 01-30-2021, 05:33 AM

RE: Valve Shimming - which side of spec? - by Houtman_imp - 01-30-2021, 06:37 AM

RE: Valve Shimming - which side of spec? - by bflint_imp - 01-30-2021, 07:26 AM

RE: Valve Shimming - which side of spec? - by peterbaron - 01-30-2021, 08:04 AM

RE: Valve Shimming - which side of spec? - by GoldOxide_imp - 01-30-2021, 08:17 AM

RE: Valve Shimming - which side of spec? - by bflint_imp - 01-30-2021, 11:14 AM

RE: Valve Shimming - which side of spec? - by the Ferret - 01-30-2021, 12:16 PM

Valve Shimming - which side of spec? - by Cormanus - 01-30-2021, 01:10 PM

RE: Valve Shimming - which side of spec? - by peterbaron - 01-31-2021, 12:33 AM

RE: Valve Shimming - which side of spec? - by jimgl3_imp - 01-31-2021, 01:00 AM

RE: Valve Shimming - which side of spec? - by GoldOxide_imp - 01-31-2021, 01:08 AM

RE: Valve Shimming - which side of spec? - by jimgl3_imp - 01-31-2021, 01:23 AM

RE: Valve Shimming - which side of spec? - by Dave_imp - 01-31-2021, 02:07 AM

RE: Valve Shimming - which side of spec? - by GoldOxide_imp - 01-31-2021, 03:59 AM

RE: Valve Shimming - which side of spec? - by bflint_imp - 01-31-2021, 04:03 AM

RE: Valve Shimming - which side of spec? - by LakeWylieJoe_imp - 01-31-2021, 06:44 AM

RE: Valve Shimming - which side of spec? - by bflint_imp - 01-31-2021, 07:35 AM

RE: Valve Shimming - which side of spec? - by Django - 01-31-2021, 08:02 AM

RE: Valve Shimming - which side of spec? - by bflint_imp - 01-31-2021, 08:35 AM

RE: Valve Shimming - which side of spec? - by zirconxi_imp - 01-31-2021, 03:39 PM

RE: Valve Shimming - which side of spec? - by LakeWylieJoe_imp - 01-31-2021, 10:23 PM

RE: Valve Shimming - which side of spec? - by GoldOxide_imp - 01-31-2021, 10:37 PM

RE: Valve Shimming - which side of spec? - by the Ferret - 01-31-2021, 11:59 PM

RE: Valve Shimming - which side of spec? - by zirconxi_imp - 02-01-2021, 12:16 AM

RE: Valve Shimming - which side of spec? - by Houtman_imp - 02-01-2021, 12:46 AM

RE: Valve Shimming - which side of spec? - by bflint_imp - 02-01-2021, 02:25 AM

RE: Valve Shimming - which side of spec? - by the Ferret - 02-01-2021, 03:58 AM

RE: Valve Shimming - which side of spec? - by max - 02-01-2021, 05:07 AM

RE: Valve Shimming - which side of spec? - by bflint_imp - 02-01-2021, 07:49 AM

RE: Valve Shimming - which side of spec? - by Dave_imp - 02-01-2021, 10:51 AM

RE: Valve Shimming - which side of spec? - by peterbaron - 02-01-2021, 11:24 AM

RE: Valve Shimming - which side of spec? - by Cormanus - 02-01-2021, 11:44 AM

RE: Valve Shimming - which side of spec? - by jimgl3_imp - 02-01-2021, 11:05 PM

RE: Valve Shimming - which side of spec? - by bflint_imp - 02-02-2021, 06:30 AM

RE: Valve Shimming - which side of spec? - by Dave_imp - 02-02-2021, 09:14 AM

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