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05-12-2008, 04:21 PM
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#1 (permalink)
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347Fastback
Join Date: Sep 2005
Posts: 8
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vibration
I need some help figuring out a surging vibration from 2400 to 3200 RPM. Below 2400 smooth above 3200 smooth no vibration. The motor specs are listed below. I have tried different trans, converter, drive shaft, timing, rear end, tires, carb, the converter is a hughs 3000 stall and a PA C4 trans.
any help would be great.
Thanks Dave
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Ford Racing 347 Short Block Edelbrock performer RPM Heads Air gap intake MSD 6 AL Ignition Demon 650 carb Crane Cam Hedman Headers 2.5" Flowmaster 40 series 3.55 Gears Aubrun Gear Pro series
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 Today
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05-12-2008, 05:04 PM
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#2 (permalink)
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mustang42782
Join Date: Nov 2006
Posts: 1,404
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Re: vibration
classic wrong flywheel imbalance situation
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05-12-2008, 05:16 PM
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#3 (permalink)
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retyler
Join Date: Oct 2003
Posts: 1,487
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Re: vibration
Quote:
Originally Posted by mustang42782
classic wrong flywheel imbalance situation
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Or damper.
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"Tell it like it is or don't tell it at all" 1964 Falcon 2dr HT, 347V8 4V, dual exhaust, 5sp, pwr assist R&P steering, AM radio, heater with defrost and 2sp fan, electric windshield wipers, cigar lighter, dlx light group, bucket seats, console and full carpet.
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05-12-2008, 05:40 PM
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#4 (permalink)
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347Fastback
Join Date: Sep 2005
Posts: 8
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Re: vibration
Quote:
Originally Posted by retyler
Or damper.
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Replaced twice no difference.
______________________________________
Ford Racing 347 Short Block Edelbrock performer RPM Heads Air gap intake MSD 6 AL Ignition Demon 650 carb Crane Cam Hedman Headers 2.5" Flowmaster 40 series 3.55 Gears Aubrun Gear Pro series
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05-12-2008, 05:42 PM
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#5 (permalink)
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347Fastback
Join Date: Sep 2005
Posts: 8
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Re: vibration
ring gear was replaced also tried the old one and a new one no difference.
______________________________________
Ford Racing 347 Short Block Edelbrock performer RPM Heads Air gap intake MSD 6 AL Ignition Demon 650 carb Crane Cam Hedman Headers 2.5" Flowmaster 40 series 3.55 Gears Aubrun Gear Pro series
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05-12-2008, 06:29 PM
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#6 (permalink)
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Spali32
Join Date: Mar 2004
Posts: 879
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Re: vibration
Looks like you got yourself a nice combo. Sounds like you have replaced all the items that could cause a vibration. Is this only when the engine is running at idle/up or driving down the road?? I would imagine your ball joints were replaced too. Are your rims balanced and trued. Hit any potholes lately?? Any cracked spark plugs or bad wires. Just trying to see if you might of overlooked anything. Good luck on finding the culprit.
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 www.spalisautodetailing.com
347 Stroker/XE284H(284/296 dur, 240/246 dur @ .050), BG 650 VS Speed Demon, Ported Victor Jr intake, Jack Roush World Product (ported from 180cc to 195cc) Jr Heads(upgraded to 2.02/1.60 valves) 260cfm/190cfm @ .550 lift, 11:1 comp... 450-475HP
Last edited by Spali32 : 05-12-2008 at 06:33 PM.
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05-12-2008, 07:21 PM
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#7 (permalink)
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347Fastback
Join Date: Sep 2005
Posts: 8
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Re: vibration
Quote:
Originally Posted by Spali32
Looks like you got yourself a nice combo. Sounds like you have replaced all the items that could cause a vibration. Is this only when the engine is running at idle/up or driving down the road?? I would imagine your ball joints were replaced too. Are your rims balanced and trued. Hit any potholes lately?? Any cracked spark plugs or bad wires. Just trying to see if you might of overlooked anything. Good luck on finding the culprit.
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Happens while driving or sitting in the driveway at 2400/3200 rpm.
______________________________________
Ford Racing 347 Short Block Edelbrock performer RPM Heads Air gap intake MSD 6 AL Ignition Demon 650 carb Crane Cam Hedman Headers 2.5" Flowmaster 40 series 3.55 Gears Aubrun Gear Pro series
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05-13-2008, 06:05 PM
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#8 (permalink)
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archoplites
Join Date: Nov 2003
Posts: 189
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Re: vibration
Same symptoms driving or sitting in the driveway. Then you can rule out suspension, driveline, rearend, and wheels.
I'm assuming they are but I will ask... Motor balanced? Flex plate balanced to motor? What imbalance are you running on the 347? Has this vibration always been around with that motor or is it something new?
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05-13-2008, 06:39 PM
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#9 (permalink)
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mustang42782
Join Date: Nov 2006
Posts: 1,404
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Re: vibration
you may have changed those items but did you try both 28 oz and 50 oz? Or just replace them with the same imbalance? OR is it a zero imbalance engine?
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05-13-2008, 10:25 PM
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#10 (permalink)
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steharz
Join Date: Mar 2003
Posts: 660
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Re: vibration
thats gotta make this abit easier to track down if its vibrating while not moving,my guess to would be in the imbalance
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81 aussie ltd-351w,rpm heads,performer rpm airgap intake,10.3 com,angus 1.6 rollers ,1 5/8 long tubes,750 edelbrock,comp xe274h,c4
82 GT mustang 302w-4 speed
55 two door ranchwagon
69 xw falcon wagon
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