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I have had a 383 stroker built by an interstate engine mob that has a voilent vibration through the engine at most engine speeds. It is enough to bash the extractors on the chassis rails and create an very unpleasent enviroment in the car. The engine is a 383 stroker, Scat crank and rods New GM block, Flat top pistons, World product heads, Performer manifold, 750 hp Holley, cam specs i don,t know. This engine was supposed to be mild, but i am sure it is going to smash itself to bits. It has a harmonic balancer with a big weight inside it and the flex plate has also got somesort of weight welded to it on the engine side.
Balancer was supplied and fitted by engine builder. Flexplate was supplied by builder and fitted by me, i think it has a dowl and can only be fitted in one spot. Box and converter (TH350/3200 STALL) supplied by engine builder and fitted by me. Have tried converter at all three different bolts holes. Still the same.
Can anyone shed any light on this as i don,t know whats going to break first, my old (new) HK ute or the engine i have been supplied. I have spent a huge amount of coin on this 3 year build and i am pretty cranky with this as you can imagine.
Any help would be appreciated.
Cheers
Stumpy
Thanks in advance
Stout
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well stumpy, i am sorry to hear about your woes? but i am sure the real cluey blokes will say the same thing> proces of elimination?? eg, does it do it when reving in neutral? or only when driving, will it vibrate if the rear wheels are off the gr Edited by user Tuesday, 15 July 2008 9:33:23 AM(UTC)
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more than basketcase than a bear!
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Yep elimination...
Id remove the trans and converter and give it a run... a trolley jack (& block o wood) on the sump to support engine just in case it decided to launch itself off the engine mounts... ...see how that goes...
If youve still got the |
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Yep elimination...
I'd remove the trans and converter and give it a run... a trolley jack (& block o wood) on the sump to support engine just in case it decided to launch itself off the engine mounts... ...see how that goes...
If you've still got th |
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My first thought was an incorrect balancer or flex plate as 3.75" stroke SBC's should be externally balanced. You might want to make sure it is actually externally balanced first. If it is I'd be banking on the weights being added in the wrong spots. Pull |
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My first thought was an incorrect balancer or flex plate as 3.75" stroke SBCs should be externally balanced. You might want to make sure it is actually externally balanced first. If it is Id be banking on the weights being added in the wrong spots. Pull t |
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Byron,
Thanks for your interest. I have forwarded some pics to you of the damper showing the counterweight and keyway location.
Thanks
Jason
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All the combo sounds OK/normal. Did the engine get balanced when it was built?
The balancer and flexplate that you have sound right for a 383 externally balanced engine. But was wondering if perhaps it has an internally/neutral balance crank, which woul
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is it firing ok?
maybe you have the firing order around the wrong way, chev order starts on the opposite side to a holden
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quote:
Originally posted by Sandman
All the combo sounds OK/normal. Did the engine get balanced when it was built?
The balan |
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After todays events and discussion with the engine builder it looks like Sandman and Byron are right.
Last night i removed the weight from the balancer and refitted it and fired the engine, with an 50-60% improvment in running quality, a lot a vibratio
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Hi stumpy
Are you saying that the engine builder has just thrown the engine together & not had anything balanced or even checked properly ??
Not much of an engine builder, IMHO.
Dr Terry |
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It says on my quote (balance assembly and blueprint assembly) ????
I was told the assembly was balanced as a kit and purchased from the states.
Lucky i only ran this engine for approx 30 minutes at different times before i thought something was,nt r
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Hi pull it out check all mains ( bearings ) get a bal job done, do not run as is , you will tare the mains out. your not the first.
some work shops do 5 or more motors on the go.
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Today i got the time to remove the weight on the flexplate with a bit of dickin around. After this i fired the engine to a sweet sounding and smooth small block chev.
Some expected (cammmy) vibration at idle, but clean and crisp from off idle to high
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Make sure you have a good oil pressure gauge. Do a test run, say 20 mins at 100kph then note what oil pressure it is sitting on, what rpms, oil type and grade etc. Then you have a good base reading if you do start having trouble with the bearings.
I hav
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