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Re: Bad Vibrations, Chicago Fury saga
[Re: furious70]
#2572445
11/01/18 12:15 AM
11/01/18 12:15 AM
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Joined: Mar 2008
Posts: 9,550
Sacramento CA
Morty426
master
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master
Joined: Mar 2008
Posts: 9,550
Sacramento CA
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I had started to wonder that. Every combo I've had in the car is supposed to be internally balanced. I've been concerned cuz this block has an 'E' stapmed on the pad and is a 71, not original to the car but was in the car when I got it with 43k in it. Engine has been rebuilt by a cheap house back in the day, had a reman tag on it.
It'd be sad that if it's always had a cast crack in it and in 21 years of ownership I didn't realize it.
This would be the first one I've mismatched, do they normally act up in only 1 rpm range? If your engine is marked "E"it's a 69 not a 71. 71 would be marked "G". All 69s are internally balanced.
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Re: Bad Vibrations, Chicago Fury saga
[Re: furious70]
#2572460
11/01/18 12:40 AM
11/01/18 12:40 AM
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Joined: Nov 2006
Posts: 2,254
IL
furious70
OP
top fuel
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OP
top fuel
Joined: Nov 2006
Posts: 2,254
IL
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No, e for cast crank, like later 440's were stamped. It's a 71 date engine by casting date
70 Sport Fury
68 Charger
69 Coronet
72 RR
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Re: Bad Vibrations, Chicago Fury saga
[Re: furious70]
#2572465
11/01/18 12:51 AM
11/01/18 12:51 AM
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Joined: Nov 2006
Posts: 2,254
IL
furious70
OP
top fuel
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OP
top fuel
Joined: Nov 2006
Posts: 2,254
IL
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Also found a site that said take rpm/60=Hertz, don't need a sirometer.
2700rpm is about the worst spot. 45hz. Same site said for internal engine stuff take second order so 90hz. What I can't find is something that says what materials or component matches that frequency.
70 Sport Fury
68 Charger
69 Coronet
72 RR
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Re: Bad Vibrations, Chicago Fury saga
[Re: Morty426]
#2572479
11/01/18 01:39 AM
11/01/18 01:39 AM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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Prefix "E" would be for the date (1969 I think)/ suffix "E" would denote a cast crank (originally & likely still) eng.
live every 24 hour block of time like it's your last day on earth
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Re: Bad Vibrations, Chicago Fury saga
[Re: furious70]
#2579009
11/16/18 01:30 AM
11/16/18 01:30 AM
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Joined: Jan 2004
Posts: 877
Pittsburgh, Pa
Jeff_383
super stock
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super stock
Joined: Jan 2004
Posts: 877
Pittsburgh, Pa
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Also found a site that said take rpm/60=Hertz, don't need a sirometer.
2700rpm is about the worst spot. 45hz. Same site said for internal engine stuff take second order so 90hz. What I can't find is something that says what materials or component matches that frequency. Once you figure out your Hz, how do you figure out if it's a 1st or 2nd order harmonic? And then what is a guide for where to look at in/on the engine? I'm trying to read up, but it's almost over my head
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Re: Bad Vibrations, Chicago Fury saga
[Re: Jeff_383]
#2579199
11/16/18 03:55 PM
11/16/18 03:55 PM
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Joined: Nov 2006
Posts: 2,254
IL
furious70
OP
top fuel
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OP
top fuel
Joined: Nov 2006
Posts: 2,254
IL
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Also found a site that said take rpm/60=Hertz, don't need a sirometer.
2700rpm is about the worst spot. 45hz. Same site said for internal engine stuff take second order so 90hz. What I can't find is something that says what materials or component matches that frequency. Once you figure out your Hz, how do you figure out if it's a 1st or 2nd order harmonic? And then what is a guide for where to look at in/on the engine? I'm trying to read up, but it's almost over my head I'm in that exact spot, I couldn't find any more info. the one site I found said that external stuff was 1st order, internal is 2nd order. I'm 99% sure it's not an accessory or physical interface with the chassis or something, so I went with 2nd order.
70 Sport Fury
68 Charger
69 Coronet
72 RR
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Re: Bad Vibrations, Chicago Fury saga
[Re: furious70]
#2579228
11/16/18 04:59 PM
11/16/18 04:59 PM
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Joined: May 2003
Posts: 6,560
Downtown Roebuck Ont
Twostick
Still wishing...
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Still wishing...
Joined: May 2003
Posts: 6,560
Downtown Roebuck Ont
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You can eliminate all the external accessories by removing all the belts. A few minutes without the waterpump turning won't be the end of the world and it will eliminate the one big accessory, the cooling fan.
How's the crank endplay?
Kevin
Last edited by Twostick; 11/16/18 05:00 PM.
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