 Need help: noisy engine after over-rev |
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| emerygt350 |
 Jul 28 2025, 08:46 PM
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#81
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Advanced Member  Group: Members Posts: 3,068 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States  |
Also... If you are worried perhaps you haven't gotten it good and hot? My engine makes all kinds of racket till it warms up and all the clearances get to where they are supposed to be. My engine sounds and behaves best after a few very hot laps. Only car I have owned that is happier after a good flogging
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| DC_neun_vierzehn |
Jul 29 2025, 08:09 AM
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#82
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Senior Member Group: Members Posts: 553 Joined: 16-November 20 From: Coastal Delaware Member No.: 24,893 Region Association: MidAtlantic Region 
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QUOTE(Jack Standz @ Jul 28 2025, 09:56 AM)  Would still perform a leak down test, especially on #4 where that suspect adjuster was. Another possibility is that the adjuster was set with way too much valve lash. If there was too much on that adjuster, it will cause more noise. Also, it might cause the marks on the adjuster face from the excessive pounding. What's the end of the valve look like for that adjuster? Unfortunately, I don't have the equipment (including an air compressor) to do a leak down myself at home, but will definitely explore shops nearby that can do it. I'll take a look at the end of the C4 exhaust valve (and take pics) when I put the new adjuster screws (once they arrive in a couple of weeks). Thanks. |
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| DC_neun_vierzehn |
Jul 29 2025, 08:11 AM
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#83
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Senior Member Group: Members Posts: 553 Joined: 16-November 20 From: Coastal Delaware Member No.: 24,893 Region Association: MidAtlantic Region
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QUOTE(emerygt350 @ Jul 28 2025, 08:46 PM) Also... If you are worried perhaps you haven't gotten it good and hot? My engine makes all kinds of racket till it warms up and all the clearances get to where they are supposed to be. My engine sounds and behaves best after a few very hot laps. Only car I have owned that is happier after a good flogging Yes, I notice more noise at start up than after running for a bit. I don't believe that was the case before though. |
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| emerygt350 |
Jul 29 2025, 12:39 PM
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#84
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Advanced Member Group: Members Posts: 3,068 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
That might hint at over tight valves before....
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