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Re: Name that noise! [Re: bigfunsixone] #1329379 Wed Oct 09 2019 11:05 PM
Joined: Feb 2004
Posts: 19,026
H
Hotrod Lincoln Offline
Boltergeist
OK, guys- - - -I've been listening to engine noises for almost 60 years. Not being there leaning over the fender makes this one a little challenging, but my opinion hasn't changed. Here's why:

The hard-sounding BUMP-BUMP-BUMP as the engine is accelerating, then leveling off and almost going away as the load goes away is classic main bearing symptoms. The crankshaft is bouncing up and down on the mains (particularly the rear with the inertia of the flywheel and clutch) like a sledgehammer. A cracked piston skirt causes a somewhat similar noise, but not as heavy or as distinct as a main bearing. This one's definitely a main. Pulling spark plug wires one at a time can isolate a bad piston- - - -it won't change a main bearing noise.

Rod knocks happen on a "float" as the engine accelerates and the speed levels off- - - -the loose bearing hammers up and down on the crankshaft journal because of excessive clearance and/or crankshaft wear. Rods make a light to moderate RATTLE-RATTLE-RATTLE noise, much faster than a main bearing knock. If several rods are involved, the frequency of the noise is quite rapid.

Valve lifter and rocker arm noises happen at a lower frequency than connecting rod or main bearing noises- - - - -the camshaft turns at half crankshaft speed.

Now- - - - -pull that engine and tear it down while it's still rebuildable, or carry a big basket around to haul the parts home when it starts chucking bits and pieces out the side of the block!
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Name that noise! [Re: bigfunsixone] #1329421 Thu Oct 10 2019 03:19 AM
Joined: Jan 2001
Posts: 4,840
P
Pre '68 Dave Offline
Shop Shark
To me it sounds like it is popping back through the carb.


See the USA in your vintage Chevrolet!
My Blog
Re: Name that noise! [Re: Pre '68 Dave] #1329457 Thu Oct 10 2019 07:07 PM
Joined: Mar 2010
Posts: 8,475
5
52Carl Online
Master Gabster
Originally Posted by Pre '68 Dave
To me it sounds like it is popping back through the carb.

Hmmm. So are you recommending taking off the valve cover, or pull the engine for a complete rebuild?
We may need to lobby for the creation of a New Team.
We can call it the: "Take Off The Valve Cover" team. smile
Carl

Re: Name that noise! [Re: bigfunsixone] #1329462 Thu Oct 10 2019 07:40 PM
Joined: Aug 2001
Posts: 3,745
2
2-Ton Offline
Shop Shark
You yahoo's do realize, that BigFunSixOne, just joined the Stovebolt Garage 5 days ago.
If he was in the Heartland, we would be lining up a team to help him yank and rebuild that motor.
Jerry would be on call for advice.
Hope we don't scare him off!

Don


Of all the things I've lost in my life, I miss my mind the most!

1967 GMC 9500 Fire Ladder Truck
"The Flag Pole"
In the Stovebolt Gallery
More pix on Photobucket
'46 2-Ton grain truck
'48 3/4-ton grain truck
'50 2-ton flatbed
'54 Pontiac Straight Eight
'70 American LaFrance pumper fire truck.
Re: Name that noise! [Re: bigfunsixone] #1329463 Thu Oct 10 2019 07:47 PM
Joined: Apr 2005
Posts: 7,723
Justhorsenround Offline
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
He was lurking yesterday PM but he hasn’t posted any updates. Wonder if he’s in cahoots with Milliman until we all get frustrated with the lack of answers.🤪


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)


"I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line" and lock up those on the wrong side of that line.

Re: Name that noise! [Re: bigfunsixone] #1329468 Thu Oct 10 2019 09:06 PM
Joined: Dec 2017
Posts: 547
D
Dragsix Offline
Shop Shark
That would be pretty funny if that ends up being the case, lol.


Mike
Re: Name that noise! [Re: bigfunsixone] #1329481 Thu Oct 10 2019 11:37 PM
Joined: Mar 2010
Posts: 8,475
5
52Carl Online
Master Gabster
Yes. We need to do something about that trouble-making Milligan guy.

Re: Name that noise! [Re: bigfunsixone] #1329488 Thu Oct 10 2019 11:57 PM
Joined: Nov 1995
Posts: 4,209
J
John Milliman Offline
Founder/Developer
Dude, like ...What EVUR laalaa


John

'49 Chevrolet 3804

Re: Name that noise! [Re: bigfunsixone] #1329496 Fri Oct 11 2019 12:53 AM
Joined: Aug 2001
Posts: 3,745
2
2-Ton Offline
Shop Shark
Do you guys know what a woman means, when she says "What EVURRR!"?
I can't post the meaning, cause this is a family site.

Don


Of all the things I've lost in my life, I miss my mind the most!

1967 GMC 9500 Fire Ladder Truck
"The Flag Pole"
In the Stovebolt Gallery
More pix on Photobucket
'46 2-Ton grain truck
'48 3/4-ton grain truck
'50 2-ton flatbed
'54 Pontiac Straight Eight
'70 American LaFrance pumper fire truck.
Re: Name that noise! [Re: bigfunsixone] #1329574 Sat Oct 12 2019 12:21 AM
Joined: Mar 2010
Posts: 8,475
5
52Carl Online
Master Gabster
Trust me, I resemble that remark.

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