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Re: Fellow Engine Builders: Low RPM Cold Knock
[Re: BigDaddy440]
#3170956
08/28/23 03:19 AM
08/28/23 03:19 AM
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Joined: Jul 2005
Posts: 707
California
BigDaddy440
OP
super stock
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OP
super stock
Joined: Jul 2005
Posts: 707
California
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UPDATE! First, thank you to all who offered suggestions. This really had me stumped. Many of you mentioned the flywheel / flex plate. Below is a 2 minute video update showing exactly where the nose was coming from. https://youtu.be/GZzx_uC7blU?si=cxSEXEHNUw8upIj_For those who would prefer reading: The flywheel bolts (not converter bolts) ended up being too long, but long enough that it wasn't noticeable to the eye. They torqued down to spec, but were actually bottoming out in the crankshaft and not pressing against the flywheel hard enough to secure it while running.
1969 A12 Roadrunner
1970 Plymouth Cuda
1968 Dodge Dart
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Re: Fellow Engine Builders: Low RPM Cold Knock
[Re: BigDaddy440]
#3171085
08/28/23 02:05 PM
08/28/23 02:05 PM
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Joined: Mar 2011
Posts: 3,085
Michigan
A727Tflite
master
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master
Joined: Mar 2011
Posts: 3,085
Michigan
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UPDATE! First, thank you to all who offered suggestions. This really had me stumped. Many of you mentioned the flywheel / flex plate. Below is a 2 minute video update showing exactly where the nose was coming from. https://youtu.be/GZzx_uC7blU?si=cxSEXEHNUw8upIj_For those who would prefer reading: The flywheel bolts (not converter bolts) ended up being too long, but long enough that it wasn't noticeable to the eye. They torqued down to spec, but were actually bottoming out in the crankshaft and not pressing against the flywheel hard enough to secure it while running. Never seen a Mopar without through holes on the crank flange.
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Re: Fellow Engine Builders: Low RPM Cold Knock
[Re: A727Tflite]
#3171088
08/28/23 02:11 PM
08/28/23 02:11 PM
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Joined: Aug 2003
Posts: 43,225
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,225
Bend,OR USA
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UPDATE! First, thank you to all who offered suggestions. This really had me stumped. Many of you mentioned the flywheel / flex plate. Below is a 2 minute video update showing exactly where the nose was coming from. https://youtu.be/GZzx_uC7blU?si=cxSEXEHNUw8upIj_For those who would prefer reading: The flywheel bolts (not converter bolts) ended up being too long, but long enough that it wasn't noticeable to the eye. They torqued down to spec, but were actually bottoming out in the crankshaft and not pressing against the flywheel hard enough to secure it while running. Never seen a Mopar without through holes on the crank flange.   They were working on Chevy, probably didn't need to post it on here. I sincerely hope they repalced that flex plate, it had way much clearance and movement between the flexplate bolts bolt to flexplate fitment   It should not rotate like it did 
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Fellow Engine Builders: Low RPM Cold Knock
[Re: Cab_Burge]
#3171090
08/28/23 02:13 PM
08/28/23 02:13 PM
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Joined: Aug 2019
Posts: 9,507
Super Spudsville
Mr PotatoHead
Half Baked
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Half Baked
Joined: Aug 2019
Posts: 9,507
Super Spudsville
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Id ask on a stockish looking build or parts, why not just use oem flywheel bolts vs aftermarket and costly. OEM stuff is pretty tough and proven.
STOP POTATO HATE!
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Re: Fellow Engine Builders: Low RPM Cold Knock
[Re: Cab_Burge]
#3171128
08/28/23 04:33 PM
08/28/23 04:33 PM
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Joined: Mar 2011
Posts: 3,085
Michigan
A727Tflite
master
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master
Joined: Mar 2011
Posts: 3,085
Michigan
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UPDATE! First, thank you to all who offered suggestions. This really had me stumped. Many of you mentioned the flywheel / flex plate. Below is a 2 minute video update showing exactly where the nose was coming from. https://youtu.be/GZzx_uC7blU?si=cxSEXEHNUw8upIj_For those who would prefer reading: The flywheel bolts (not converter bolts) ended up being too long, but long enough that it wasn't noticeable to the eye. They torqued down to spec, but were actually bottoming out in the crankshaft and not pressing against the flywheel hard enough to secure it while running. Never seen a Mopar without through holes on the crank flange. They were working on Chevy, probably didn't need to post it on here. I sincerely hope they repalced that flex plate, it had way much clearance and movement between the flexplate bolts bolt to flexplate fitment It should not rotate like it did Guilty as charged - not reading the first post.
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Re: Fellow Engine Builders: Low RPM Cold Knock
[Re: BigDaddy440]
#3182894
10/10/23 09:07 PM
10/10/23 09:07 PM
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Joined: Oct 2023
Posts: 1
JACKSONVILLE
Pealer
member
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member
Joined: Oct 2023
Posts: 1
JACKSONVILLE
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Did the bolts solve the issue?? I've been following this thread for a couple weeks but just now registered to be able to see the replies, and I watched the vid and read the description. No idea if this is the issue I'm dealing with but it will be the first culprit once I get under the car to check things out. Thanks for the updates!!
Last edited by Pealer; 10/10/23 09:18 PM.
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